DEPARTMENT OF ENVIRONMENTAL QUALITY

WASTE AND HAZARDOUS MATERIALS DIVISION

STORAGE AND HANDLING OF GASEOUS AND LIQUEFIED HYDROGEN

SYSTEMS

(By authority conferred on the department of environmental quality by section 3c of

1941 PA 207, MCL 29.3c, and Executive Reorganization Order No. 1998-2, MCL

29.461)

PART 1. GENERAL PROVISIONS

R 29.7001 Applicability.

Rule 1. These rules apply to the operation of all gaseous and Liquefied

hydrogen systems. A person shall comply with these rules, other applicable state and

federal statutes, and rules and regulations promulgated under the statutes.

History: 2008 AACS.

R 29.7002 Storage and handling of gaseous and Liquefied hydrogen; adoption

of standard by reference.

Rule 2. The national fire protection association's

(NFPA)

Pamphlet 50A,

"Standard for Gaseous Hydrogen Systems at Consumer Sites," 1999 edition and NFPA

Pamphlet 50B, "Standard for Liquefied Hydrogen Systems at Consumer Sites,"

1999 edition, referred to in these rules as the "code," pertaining to the storage and

handling, but not transportation, of gaseous and Liquefied hydrogen, are adopted by

reference as part of these rules. Copies of the adopted code are available for inspection

at the office of the Department of Environmental Quality, Waste and Hazardous

Materials Division, Storage Tank Unit, P.O. Box 30241, Lansing, Michigan 48909-

7741, or for purchase from the National

Fire

Protection

Association,

Batterymarch Park, Quincy, Massachusetts 02269, telephone number 800-344-

3555. The cost of the code, at the time of the adoption, is $28.00 each, plus a $7.95

handling charge, per copy; or at the office of the Department of Environmental

Quality, Waste and Hazardous Materials Division, Storage Tank Unit, P.O. Box

30241, Lansing, Michigan 48909-7741, for a cost, at the time of the adoption of these

rules, of $35.95, per copy, plus $20.00 handling, plus shipping.

History: 2008 AACS.

PART 2. STORAGE AND HANDLING OF GASEOUS HYDROGEN NFPA

50A

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Chapter 1 General Information

R 29.7010 Chapter 1 General information.

Rule 10. Sections 1-1 to 1-1.2 of the storage and handling of

Liquefied hydrogen code are added as follows:

gaseous and

1-1 Scope. This standard covers the requirements for the design, siting,

construction, installation, operation, maintenance, and dispensing from a gaseous

hydrogen system.

1-1.1 Nothing in this hydrogen code shall be intended to prevent the use of systems,

methods, or devices of equivalent or superior quality, strength, fire resistance,

effectiveness, durability, environmental protection capability, or safety over those

prescribed by this hydrogen code, if technical documentation is submitted to the

department to demonstrate equivalency and the system, method, or device is approved

for the intended purpose.

1-1.2 This code shall apply to the design and installation of compressed H₂

dispensing systems.

Exception: Dispensing to rail and aircraft.

History: 2008 AACS.

R 29.7011 Classification.

Rule 11. Section 1-2 is reproduced from NFPA 50A as follows:

1-2 Classification. Systems are classified according to the total volume of hydrogen,

including unconnected reserves, as follows:

(a) Less than 3500 scf (99 m3), except as covered in 1-3.1

(b) From 3500 (99 m3) to 15,000 scf (425 m3)

(c) In excess of 15,000 scf (425 m3)

History: 2008 AACS.

R 29.7012 Application.

Rule 12. Section 1-3.2 is reproduced from NFPA 50A, and sections 1-3,

1-3.1, 1-3.3, 1-3.4, and 1-3.5 of the storage and handling of gaseous and Liquefied

H₂code are added as follows:

1-3 Application.

1-3.1 The application of this standard at places of public assembly shall meet the

requirements of section 3-2.2(a) and the approval of the department.

1-3.2 This standard shall not apply to single systems using containers having a total

H₂content of less than 400 scf (11 m3). Where individual systems, each having a total

H₂content of less than 400 scf (11 m3), are located less than 5 ft (1.5 m) from each other,

this standard shall apply.

1-3.3 This standard does not apply to flow-through process containers.

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1-3.4 When required by the department, H₂introduced into any system covered

by this code shall have a leak detection system acceptable to the department and based

on the best interest of public health, safety, and welfare and the environment.

1-3.5 Gaseous H₂in fuel tanks on vehicles and mobile equipment shall not be

included in determining the maximum allowable quantities.

History: 2008 AACS.

R 29.7013 Retroactivity.

Rule 13. Sections 1-4 and 1-4.1 of the storage and handling of

Liquefied H₂code are added as follows:

1-4 Retroactivity.

gaseous and

1-4.1 The provisions of this H₂code are necessary to provide a reasonable level of

protection from loss of life and property from fire and explosion.The provisions shall

reflect situations and the state of the art prevalent when the H₂code was issued. Unless

otherwise noted, it is not intended that the provisions of this H₂code be applied to

facilities, equipment, structures, or installations that were existing or approved for

construction or installation before the effective date of this H₂code, except in those

cases where it is determined by the department that the existing situation involves a

distinct hazard to public health, safety, adjacent property, or the environment.

History: 2008 AACS.

R 29.7014 Definitions.

Rule 14. Section 1-5 of the storage and handling of gaseous and Liquefied H₂code

is added, and Section 1-5.1 is reproduced from NFPA 50A as follows:

1-5 Definitions.

(a) "ANSI" means the american national standards institute.

(b) "Approved" means acceptable to the department.

(c) "ASME" means the american society of mechanical engineers.

(d) "Authority having jurisdiction" means the department.

(e) "Automatic emergency shutoff valve" means

a

designated fail-safe

automatic closing valve designed to shutoff the flow of gases or liquids that is initiated

by a control system where the control system is activated by either manual or

automatic means.

(f) "Bulk storage" means a single container or containers, where all containers

draw down at the same time.

(g) "Cargo transport container" means a mobile unit designed to transport

gaseous or liquefied H₂.

(h) "Cascade storage system" means storage in containers or cylinders

arranged in banks where each bank acts as 1 large container. The banks are separated

by switching valves to provide sequential drawdown of the banks.

The bank may consist of 1 or more containers or cylinders.

(i) "Cathodic protection" means a technique to prevent the corrosion of a metal

surface by making the surface the cathode of an electrochemical cell.This protection

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renders a metallic container or piping component negatively charged with respect to its

environment. This protection shall be designed by a corrosion expert as defined by

these rules.

(j) "Cathodic protection tester" means a person who can demonstrate an

understanding of the principles and measurements of all common types of cathodic

protection systems applicable to metal piping and container systems and who has

education and experience in soil resistivity, stray current, structure-to-soil potential,

and component electrical isolation measurements of metal piping and container

systems. The person shall be certified as being qualified by the national association

of corrosion engineers (NACE) international.

(k) "Composite container" means a container fabricated of 2 or more materials

that interact to facilitate the container design criteria.

(l) "Compression discharge pressure" means the varying pressure at the point of

discharge from the compressor.

(m) "CGA" means the compressed gas association.

(n) "Container" means a pressure vessel or cylinder used to store H₂.

(o) "Container appurtenances" means devices connected to container openings

for safety, control, or operating purposes.

(p) "Container system" means a container or combination of containers and all

attached appurtenances, valves, and piping.

(q) "Container valve" means a valve connected directly to the container

outlet.

(r) "Continuous gas detection system" means a gas detection system in which the

instrument is maintained in continuous operation.

(s) "Corrosion expert" means a person who, by reason of thorough knowledge of

the physical sciences and the principals of

engineering

and mathematics

acquired by a professional education and related practical experience, is qualified to

engage in the practice of corrosion control of container systems. The person

shall be certificated as being qualified by NACE, as a senior corrosion technologist,

a cathodic protection specialist, or a corrosion specialist or be a registered engineer

who has certification and licensing that includes education and experience in corrosion

control.

(t) "Corrosion protection" means protecting a container system to prevent the

degradation of the metal through oxidation or reactivity with its environment.

(u) "Cylinder" means a container constructed in accordance with the United

States Department of Transportation (U.S. DOT) specifications, title 49, code of federal

regulations (CFR), parts 171-190.

(v) "Department" means the department of environmental quality.

(w) "Director" means the director of the department of environmental quality.

(x) "Dispensing station" means an H₂installation that

dispenses

H₂from

storage containers into fuel supply containers or into portable cylinders by means of

a compressor, reformer, vaporizer, or pressure booster.

(y) "Emergency shutdown device (ESD)" means a device that closes all fueling

operations within the fueling facility from either local or remote locations.

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(z) "Excess flow control" means to limit or stop the flow of H₂gas from a source

of supply when there is a rupture, break, or 'open valve to atmosphere' condition

that may present a hazard to personnel or the environment.

(aa) "Fail-safe" means a design feature that provides for the maintenance of safe

operating conditions in the event of a malfunction of control devices or an interruption of

an energy source.

(bb) "Fast fill station" means a storage and dispensing system designed to fill

motor vehicle fuel tanks with compressed, gasified H₂. The vehicle fuel tank is filled by

connecting to a system designed to provide a fuel fill rate above 12 scfm.

(cc) "Fixed liquid level device" means a device that indicates

container is filled to its maximum permitted liquid filling volume.

when the

(dd) "Flow-through process container" means a container that forms an

integral part of a production process through which there is a steady, variable,

recurring, or intermittent flow of materials during the operation of the process and the

container is utilized to carry out or control the heating, cooling, mixing, blending,

separating, metering, or chemical reaction of materials. The processing is done on a

regular basis and it is the primary function of the container. A flow-through process

container does not include a container that is used for the storage of materials before its

introduction into the production process or for the storage of finished products or

by-products from the production process or a container that is only used to recirculate

materials.

(ee) "Fuel dispenser system" means all the pumps, meters, piping,

controls used for the delivery of fuel.

hose, and

(ff) "Fueling connector" means a mating device at the refueling station,

including shutoff valves that connect the fueling dispenser hose to the vehicle fuel

filling system receptacle for the transfer of liquid or vapor.

(gg) "Gallon water capacity (wc)" means the amount of water in gallons at 60

degrees Fahrenheit (15 degrees Celsius) required to fill a container.

(hh) "Gas detection system" means a grouping of 1 or more sensors capable of

detecting an H₂leak at specified concentrations and activating alarms and safety

systems.

(ii) "Gaseous H₂system" means a system in which the H₂is delivered, stored,

and discharged in the gaseous form including the piping system. The gaseous H₂system

terminates at the point where the H₂is dispensed.

(jj) "Hydrogen (H₂)" means the simplest and lightest element in the known

universe, which exists as a gas except at low cryogenic temperatures.H₂gas is a colorless,

odorless and highly flammable gas when mixed with oxygen over a wide range of

concentrations. H₂forms water when combusted, or when otherwise joined with

oxygen, as within a fuel cell.

(kk) "Hydrogen code" means the storage and handling of gaseous and liquefied

H₂rules as promulgated by the department.

(ll) "Hydrogen gas vehicle (HGV) or vehicle" means a self-propelled device on

land, in, on, or by which any person or property is or may be transported or drawn upon,

except for a device exclusively moved by human power, and which has the capability

to use H₂gas as an engine fuel.

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(mm) "Ignition source" means any item or substance capable of an energy

release of type and magnitude sufficient to ignite any flammable mixture of gases or

vapors that could occur at the site.

(nn) "kPa" means absolute pressure in kilo-Pascals.

(oo) "kPag" means gauge pressure in kilo-Pascals.

(pp) "Labeled" means equipment or materials to which has been attached a label,

symbol, or other identifying mark of an organization that is acceptable to the

department and concerned with

product

evaluation, that maintains periodic

inspection of production of labeled equipment or materials, and by whose labeling the

manufacturer indicates compliance with accepted or approved standards of construction

and or performance.

(qq) "Listed" means equipment, materials, or services included

in

a list

published by an organization that is acceptable to the department and concerned with

evaluation of products or services, that maintains periodic inspection of production

listed equipment or materials or periodic evaluation of services, and whose listing states

that either the equipment, material, or service meets appropriate designated standards

or has been tested and found suitable for a specified purpose.

(rr) "Manifolded storage system" means storage in containers arranged in banks

where each bank acts as 1 large container. The banks are separated by switching valves

to provide sequential drawdown of the banks. The bank may consist of 1 or more

containers.

(ss) "Manual emergency shutoff valve" means a designated valve designed to

shutoff flow due to a rupture in pressurized piping system.

(tt) "Maximum allowable working pressure (MAWP)" means the maximum

pressure to which any component or portion of the pressure system can be subjected.

(uu) "Maximum operating pressure (MOP)" means the steady-state gauge

pressure at which a part or system normally operates.

(vv) "Metal hydride storage system" means a system for the storage of H₂gas

absorbed in solid material.

(ww) "Motor fuel dispensing facility" means that portion of the property

where H₂is stored and dispensed from fixed equipment into the fuel tanks of motor

vehicles, marine craft, or into approved containers, including all equipment used in

connection therewith.

(xx) "NACE" means the national association

international.

(yy) "Original equipment manufacturer (OEM)" means

of

corrosion engineers,

an original

equipment motor vehicle manufacturer that certifies that the motor vehicle complies

with applicable federal motor vehicle safety codes.

(zz) "Partially buried container" means a container that has part of, but less than

100%, of the container surface covered with earth.

(aaa) "Point of transfer" means the point where the transfer connection is made.

(bbb) "Portable container" means a container designed to be moved readily, as

distinguished from containers designed for stationary installations. Portable

containers, designed for transportation with H₂, filled to their maximum filling limit,

include "cylinders," "cargo tanks," and "portable tanks," all 3 of which are defined

separately. Containers designed to be readily moved from 1 usage location to another,

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but substantially empty of product, are "portable storage containers" and are defined

separately.

(ccc) "Portable storage container" means a container

similar

to those

designed and constructed for stationary installation, designed so that it can be moved

readily over the highways, substantially empty of H₂, from 1 usage location to another.

Such containers either have legs or

other supports attached, or are mounted on

running gear, such as trailer or semitrailer chassis, with suitable supports that can be

of the fold-down type, allowing them to be placed or parked in a stable position on

a reasonably firm and level surface. For large-volume, limited-duration product

usage, such as at construction sites and normally for

6

months or less, portable

storage containers function in lieu of permanently installed stationary containers.

(ddd) "Portable tank, or skid tank" means a container of more than 1,000 lb (454

kilogram) water capacity used to transport H₂, handled as a package, that is, filled

to its maximum permitted filling limit. Such containers are mounted on skids or

runners and have all container appurtenances protected in such a manner that they can

be safely handled as a package.

(eee) "Pressure relief device (PRD)" means

a

pressure or temperature

activated device used to prevent pressure from rising above a specified value and

thereby prevent the rupture of a normally charged pressure vessel or a cylinder due

to emergency or abnormal conditions.

(fff) "Pressure vessel" means a container or other component designed in

accordance with the ASME code.

(ggg) "psi" means pounds per square inch.

(hhh) "psia" means pounds per square inch, absolute.

(iii) "psig" means pounds per square inch gauge.

(jjj) "Rated pressure" means the pressure to which

a

component

is rated

provided that the MAWP is observed for temperature extremes.

(kkk) "Release" means an unexpected discharge of H₂.

(lll) "Remotely located manually activated shutdown control" means a control

system that is designed to initiate shut down of the flow of gas or liquid that is manually

activated from a point located some distance from the delivery system.

(mmm) "Residential fueling facility" means a listed vehicle fueling appliance

used for the compression and delivery of H₂into vehicles at a residence which

includes its associated equipment and piping.

(nnn) "Service pressure" means the nominal gas pressure at

a

uniform gas

temperature of 70 degrees Fahrenheit (21 degrees Celsius) when the equipment is

properly and completely charged with gas; the nominal design pressure for which the

equipment has been constructed.

(ooo) "Set pressure" means the start-to-discharge pressure for which a relief

valve is set and marked.

(ppp) "Standard cubic foot per minute (scfm)" means the amount of gas flow in

standard cubic feet per minute compensated for pressure and temperature.

(qqq) "Substantially empty" means a gas container of H₂when the residual gas

pressure is less than 10% of the maximum allowable working pressure of the vessel.

(rrr) "Vehicle-fueling appliance" means a self-contained listed assembly used for

the compression and delivery of H₂gas into vehicles including associated equipment

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and piping of the appliance.1-5.1 NFPA official definitions.Combustible Liquid. A liquid

having a closed-cup flash point at or above 100°

F (37.8°C) and are subdivided as follows:

(a) Class II liquids include those having a flash point at

(37.8°C) and below 140°F (60°C).

(b) Class IIIA liquids include those having a flash point at or

(60°C) and below 200°F (93.4°C).

or

above 100°F

above 140°F

above 200°F

(c) Class IIIB liquids include those having a flash point at or

(93.4°C).Flammable Liquid (Class I). Any liquid having a closed-cup flash point below

100°F (37.8°C) and having a vapor pressure not exceeding 40 psia (276 kPa) at 100°F

(37.8°C).Gallon. A standard U.S. gallon.Limited-Combustible Material. A material, as

defined in NFPA 220, Standard on Types of Building Construction, not complying

with the definition of noncombustible material that, in the form in which it is used,

has a potential heat value not exceeding 3500 Btu/lb (8141 kJ/kg) and complies with one

of the following paragraphs (a) or (b). Materials subject to an increase in combustibility

or flame spread rating, beyond the limits herein established, through the effects of

age, moisture, or other atmospheric condition are considered combustible.

(a) Materials having a structural base of noncombustible material,

with a

surfacing not exceeding a thickness of 1/8 in. (3.2 mm) that has a flame spread

rating not greater than 50.

(b) Materials, in the form and thickness used, other than as described in (a),

having neither a flame spread rating greater than 25 nor evidence of continued

progressive combustion and of such composition that surfaces that would be exposed

by cutting through the material on any plane would have neither a flame spread rating

greater than

25

nor

evidence

of continued progressive combustion.

Noncombustible Material. A material, as defined in NFPA 220, Standard on Types of

Building Construction, that, in the form in which it is used and under the conditions

anticipated, will not ignite, burn, support combustion, or release flammable vapors

when subjected to fire or heat. Materials reported as noncombustible, when tested in

accordance with ASTM E 136, Standard Method of Test for Behavior of Materials in a

Vertical Tube Furnace at 750°C, are considered noncombustible materials. Outdoors.

Location outside of any building or structure or locations under a roof, weather shelter,

or canopy provided this area is not enclosed on more than two sides.

Separate Building. A detached, noncommunicating building used exclusively to

house a hydrogen system.Shall. Indicates a mandatory requirement.Special Room. A

separate enclosed area that is part of or attached to another building and is used

exclusively for an H₂system.Standard. A document, the main text of which contains

only mandatory provisions using the word "shall" to indicate requirements and which is

in a form generally suitable for mandatory reference by another standard or code or for

adoption into law. Nonmandatory provisions shall be located in an appendix, footnote,

or fine-print note and are not to be considered a part of the requirements of a standard.

Standard Cubic Foot (scf). One cubic foot of gas at 70°F (21°C) and 14.7 psia (an

absolute pressure of 101 kPa).

History: 2008 AACS.

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R 29.7015 Equivalency.

Rule 15. Sections 1-6 to 1-6.3 of the storage and handling of

Liquefied H₂code are added as follows:

1-6 Equivalency.

gaseous and

1-6.1 Nothing in this H₂code shall be intended to prevent the use of systems,

methods, or devices having equivalent or superior quality, strength, fire resistance,

effectiveness, durability, environmental protection capability, or safety over those

prescribed by the H₂code, if technical documentation is submitted to the department

to demonstrate equivalency and the system, method, or device is approved for the

intended purpose.

1-6.2 An owner or operator may make an application for a variance of rules by

applying to the department with a satisfactory explanation of why compliance is not

possible. The department may approve the variance request upon finding that the

variance is based upon the best interest of public health, safety, and welfare and the

environment.

1-6.3 A person aggrieved by a final decision of the department on a request for

variance or an equivalency determination may appeal to the circuit court within 21 days

of receiving the decision.

History: 2008 AACS.

R 29.7016 Prohibitions.

Rule 16. Sections 1-7 to 1-7.4 of the storage and handling of gaseous and

Liquefied H₂code are added as follows:

1-7 Prohibitions.

1-7.1 Any H₂storage container system or practice that is not in compliance with these

rules shall be considered to be in violation of these rules.

1-7.2 Upon notification by the department, a person shall not deliver H₂to a storage

container system under any circumstances that are prohibited by these rules or if a

container is not in compliance with these rules. Such notification may include a

verbal or written communication or an affixed written notification on the H₂system.

1-7.3 A person shall not tamper with, remove, or disregard written notification

affixed to the storage container system.

1-7.4 An owner or operator shall not continue to use a storage container system

that is causing a release and shall expeditiously empty the system or the component that

is causing the release until the system is repaired or replaced.

History: 2008 AACS.

R 29.7017 Installation application.

Rule 17. Sections 1-8 to 1-8.4 of the storage and handling of

Liquefied H₂code are added as follows:

gaseous and

1-8 Installation application.

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1-8.1 An application for plan review shall be submitted, on a form provided by the

department, by the owner or owner's designee on behalf of the owner to the department

not less than 30 days before the installation of an H₂storage container system.

1-8.1.1 The installation application shall include all of the following information:

(a) A plot map showing all of the following within 100 feet (30.5 meters) of any

portion from the container system:

(i) The location of the following:

(A) Buildings.

(B) Public roadways.

(C) Railroad mainlines.

(D) Public sidewalks.

(E) Overhead power lines.

(ii) The proposed location of the dispensing station.

(iii) The location of property lines.

(iv) The locations of existing aboveground and underground tanks storing

flammable and combustible liquids, and flammable, compressed or liquefied gases.

(v) The location of the point of transfer in relationship to all of the following:

(A) The container.

(B) Buildings.

(C) Public ways.

(D) Outdoor places of public assembly.

(E) Driveways.

(F) Main line railroad track center lines.

(G) The line of adjoining property that may be built upon.

(H) Aboveground and underground tanks

storing

flammable

and

combustible liquids and/or flammable, compressed, or liquefied gases.

(b) The construction material, the dimensions and the capacity of each container.

(c) The type of container venting and pressure relief.

(d) The compressor(s) size (psig and scfm).

(e) Container appurtenances.

(f) A piping diagram showing sizes, valves, pressure relief and fittings, and control

devices.

1-8.2 Upon acknowledged receipt of the plans, the department shall issue a plan

review report within 30 days. If the plan review report is not issued within 30 days,

the installation may be constructed according to the submitted plans and shall

comply with these rules.

1-8.3 An applicant shall notify the department upon completion of the

installation before the installation is placed into service. The department shall inspect

the installation after receiving notification and shall certify the installation, if the

requirements of the rules are met. If the inspection is not made within 2 working

days, then the applicant may place the installation into service, or if intended to be

underground, mounded, or partially underground, may cover the installation from

sight, and shall notify the department, and shall submit a notarized affidavit to the

department attesting to the fact that the installation complies with the installation

application submitted and the applicable rules.

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1-8.4 Upon the owner's request, all plans and specifications that are submitted to

the department for review shall be returned after the department has certified the

installation or within 30 working days after notification to the department of the

completion of the installation. Plans and specifications may be marked "Confidential-

Do Not Copy" at the time they are submitted.

History: 2008 AACS.

R 29.7018 Installation application fees and annual certification.

Rule 18. Sections 1-9 to 1-9.2 of the storage and handling of gaseous and Liquefied

H₂code are added as follows:

1-9 Installation application fees and annual certification.

1-9.1 Only an owner of an H₂container system for which an installation

application is required to be submitted under section 1-8 of the H₂code shall be

required to pay fees as specified in section 5 of 1941 PA 207, MCL 29.5.

1-9.2 For the purpose of assessing fees on permanent installations, each 26,000 scf

storage capacity of H₂or increment thereof, shall be considered a container or any

container filling location, as used in section 5 of 1941 PA 207, MCL 29.5.

History: 2008 AACS.

R 29.7019 Personnel.

Rule 19. Sections 1-10 to 1-10.1 of the storage and handling of

Liquefied H₂code are added as follows:

1-10 Personnel.

gaseous and

1-10.1 In the interest of safety, all persons involved in handling H₂shall be trained

in the proper handling and operating procedures. This training shall be acceptable to

the department.

Exception: This training is not required for a person dispensing H₂into a vehicle at

an attended self-service facility.

History: 2008 AACS.

Chapter 2 Design of Gaseous Hydrogen Systems

R 29.7020 Containers.

Rule 20. Section 2-1.3 is reproduced from NFPA 50A, and sections 2-1, 2-1.1,

2-1.2, and 2-1.4 to 2-1.8.2 of the storage and handling of gaseous and Liquefied

H₂code are added as follows:

2-1 Containers.

2-1.1 H₂containers shall comply with 1 of the following:

(a) Designed, constructed, and tested in accordance

with appropriate

requirements of ASME International, "Boiler and Pressure Vessel Code," Section

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VIII, "Rules for the construction of pressure vessels, " adopted by reference in section 8-

1.

(b) Designed, constructed, tested, and maintained in accordance with Title 49,

CFR.

(c) Metal hydride storage systems shall be listed for the application and designed

in a manner that prevents the removal of the metal hydride.

(d) When allowed by the department, fully over-wrapped carbon composite

containers designed to a standard acceptable to the department based on the best

interest of public health, safety, and the environment.

2-1.2 Permanently installed aboveground containers shall be provided with

substantial supports, constructed of noncombustible material on firm foundations of

noncombustible material, and shall comply with the following subsections as applicable:

(a) Steel supports in excess of 18 inches (45.72 centimeters) in height, shall

have a minimum 2-hour fire resistance rating, see figure 2-1.2.

Exception: Supports may be greater than 18 inches (45.72 centimeters) if owner

demonstrates, to the satisfaction of the department, that the container will not be exposed

to a 2-hour pool fire.

(b) If a permanently installed aboveground container is in an area that is subject to

buoyant forces, provision shall be made to prevent the container, either full or

empty, from floating during a rise in water level, including up to the established

maximum flood stage.

(c) Horizontally installed containers shall have not more than 2 points of support

longitudinally or other methods approved by the department based on the best interest

of public health, safety, and welfare and the environment.

(d) Horizontally installed containers shall not be in direct contact with each

other.

(e) Composite containers shall be protected from UV radiation as required in the

manufacturer's specifications.

(f) Aboveground containers shall be protected

equivalent means where necessary to inhibit corrosion.

by

painting

or other

Exception: Composite containers shall not be painted without prior permission from

the container manufacturer.

(g) Welding or brazing for the repair or alteration of an ASME pressure

vessel shall comply with the standard adopted in section 8-1.2.1.

(h) Other welding or brazing shall be permitted only on saddle plates, lugs, or

brackets which are attached to the pressure vessel by the pressure vessel manufacturer.

(i) The exchange or interchange of pressure vessel appurtenances intended for the

same purpose shall not be considered a repair or alteration and appurtenances must

comply with these rules.

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2-1.3 Each portable container shall be legibly marked with the name hydrogen in

accordance with ANSI/CGA C-4, Method of Marking Portable Compressed Gas

Containers to Identify the Material Contained. Each manifold hydrogen supply unit shall

be legibly marked with the name hydrogen or a legend such as "This unit contains

hydrogen."

2-1.4 An owner or operator that has

had

a container subjected to heat

exposure due to fire shall remove the container from service, unless the owner

or operator provides documentation of recertification in accordance with section 2-

1.1, to the department substantiating container integrity.

2-1.5 Guard posts or other approved means shall be provided to protect a container

system subject to vehicular damage. When guard posts are installed, all of the

following design specifications shall be met:

(a) Guard posts shall be constructed of steel not less than

centimeters) in diameter and shall be filled with concrete.

4

inches (10.16

(b) Guard posts shall be spaced not more than 4 feet (1.2 meters) on center.

(c) Guard posts shall be set not less than 4 feet (1.2 meters) deep in a concrete

footing that is not less than 15 inches (38.1 centimeters) in diameter.

(d) Guard posts shall be not less than 4 feet (1.2 meters) in height above grade.

(e) Other means as approved by the department based on the best interests of public

health, safety, and welfare and the environment.

2-1.6 Physical protection. Containers, piping, valves, pressure-relief devices,

regulating equipment, and other appurtenances shall be protected against physical

damage and tampering.

2-1.7 Portable containers subject to shifting or upset shall be secured.Nesting may

be used to secure portable containers.

2-1.8 Underground containers. Underground containers for the storage of gaseous

H₂shall be in accordance with this subsection.

2-1.8.1 Construction. Storage containers for gaseous H₂shall be designed and

constructed in accordance with Section VIII of ASME International, "Boiler and

Pressure Vessel Code," adopted by reference in section 8-1, and shall be vacuum-

jacketed in accordance with section 2-1.10.1.1.

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2-1.8.2 Corrosion Protection. The underground container shall be protected by an

engineered corrosion protection system designed by a corrosion expert.If cathodic

protection is used the maintenance schedule shall meet the requirements of section 5-

4.

History: 2008 AACS.

R 29.7021 Pressure relief devices.

Rule 21. Section 2-2.3 is reproduced from NFPA 50A, and sections 2-2, 2-2.1,

2-2.2, and 2-2.4 to 2-2.7.1 of the storage and handling of gaseous and Liquefied

H₂code are added as follows:

2-2 Pressure relief devices.

2-2.1 H₂containers shall be protected from credible overpressure scenarios by a

relief device installed in accordance with the ASME International, "Boiler Pressure

Vessel Code," section VIII division 1 sections UG 125 through 137, adopted by

reference in section 8-1. When all credible overpressure sources are external to the

container, the relief device(s) need not be installed directly on the container. In such

cases, the relief devices may be installed in the piping between the container and

the source(s) of overpressure and a block valve may be installed between the relief

device(s) and container, provided the source of overpressure is blocked from the

container.

2-2.1.1 Fully over-wrapped carbon composite containers shall be protected by

thermally activated pressure relief devices acceptable to the department based on the

best interests of public health, safety, welfare and the environment.

2-2.2 Pressure relief devices, when installed, shall be arranged to discharge upward

and unobstructed to the open air in such a manner as to prevent any impingement of

escaping gas upon the container, adjacent structures, or personnel. The vent and

piping system from relief device(s) shall be designed and installed in accordance with

CGA G-5.5.

2-2.3 Pressure relief devices or vent piping shall be designed or located so that

moisture cannot collect and freeze in a manner that would interfere with proper operation

of the device.

2-2.4 Pressure relief valves for gaseous H₂service shall not be fitted with manual

relief (lifting devices).

2-2.5 Pressure relief valves for gaseous H₂systems, if externally adjustable,

shall be provided with a means for sealing the adjustment to prevent tampering.

2-2.5.1 If at any time it is necessary to break such a seal, the valve shall be removed

from service until it has been reset and sealed in accordance with design, certification,

and installation code specified in section 2-2.1.

2-2.6 Pressure relief valves shall be tested at least every 5 years.

Exception: Non-ASME relief valves used for blocked-in portions of piping as

thermal relief valves will not be tested.

2-2.7 Excess flow control shall be provided for pressurized H₂piping systems above

15 psig when system design allows their application to add a significant measure

of safety for break, rupture, or open valve (to atmosphere) conditions.

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2-2.7.1 The location of excess flow control shall be as specified as in either of the

following situations:

(a) Where piping originates from a source located in a room or area, the excess

flow control shall be located within the same room or area.

(b) Where piping originates from a bulk source, the excess flow control shall

be as close to the bulk source as possible.

Exception: The above requirements shall not apply to piping for inlet

connections designed to prevent backflow, piping pressure relief devices, or systems

containing 450 scf of H₂gas or less.

History: 2008 AACS.

R 29.7022 Piping, tubing, and fittings.

Rule 22. Sections 2-3.1 is reproduced from NFPA 50A, and sections 2-3.1.1,

2-3.1.2, and 2-3.2 to 2-3.13 of the storage and handling of gaseous and Liquefied

H₂code are added as follows:

2-3 Piping, tubing, and fittings.

2-3.1 Piping, tubing, and fittings shall be suitable for H₂service and for the

pressures and temperatures involved. Cast-iron pipe and fittings shall not be used.

2-3.1.1 A piping system shall be substantially supported and protected against

physical damage and excessive stresses arising from settlement, vibration, expansion,

or contraction. Supports for aboveground piping shall be constructed of noncombustible

material.

2-3.1.2 Aboveground piping systems shall be protected from corrosion in

compliance with recognized standards. Underground piping systems shall be in

compliance with section 5-4.

2-3.2 Material specifications and thickness requirements for piping and tubing

shall conform to ASME B31.3, "Process Piping," adopted by reference in section 8-1.

2-3.3 Brazing materials shall have a melting point above 1,000 degrees

Fahrenheit (538 degrees Celsius). Flanged connection shall use a gasket that is suitable

for H₂. When making joints in piping and tubing, thread sealants, when used, shall

be suitable for H₂service and shall be applied to male pipe threads prior to assembly.

2-3.4 Aboveground piping systems shall be marked in accordance with the

following:

(a) Marking shall include the name of the gas and direction of flow arrow.

(b) Marking for piping systems shall be provided at the following locations:

(i) At each critical process control valve.

(ii) At wall, floor, or ceiling penetrations.

(iii) At each change in direction.

(iv) At a minimum of every 20 feet (6.1 meters) or fraction thereof

throughout the piping run.

2-3.5 Threaded or flanged connections shall not be used in areas other than

outdoors.

2-3.6 Underground piping shall be installed on a bedding of at least 6 inches (15.24

centimeters) of well-compacted backfill material.

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2-3.7 In areas subject to vehicle traffic, the pipe trench shall be of sufficient

depth to permit a cover of not less than 18 inches (45.72 centimeters) of well

compacted backfill material and pavement.

Exception 1: In paved areas where a minimum of 8 inches (20.32 centimeters) of

asphalt paving is used, the depth of the backfill between the topmost tier of piping and

the paving may be reduced to not less than 8 inches (20.32 centimeters).

Exception 2: In paved areas where a minimum of 6 inches (15.24 centimeters) of

reinforced concrete paving is used, the depth of backfill between the topmost tier of

the piping and the paving may be reduced to not less than 4 inches (10.16 centimeters).

2-3.8 In areas not subject to vehicle traffic, the pipe trench shall be of sufficient

depth to permit 6 inches (15.24 centimeters) each of bedding and cover of well-

compacted backfill material. A greater burial depth shall be provided when required by

the manufacturer's instructions.

2-3.9 Piping within the same trench shall be separated by more than 3 times the

diameter of the larger adjacent pipe.

2-3.10 Piping to equipment shall be provided with an accessible, manual shutoff

valve.

2-3.11 Pipe, tubing, fittings, and other piping components shall be capable of

withstanding a hydrostatic test of at least 3 times the rated service pressure without

structural failure as documented by the manufacturer.

2-3.12 All natural gas piping shall be installed in accordance with R 29.4601 et seq.

2-3.13 All liquefied petroleum gas piping shall be installed in accordance with R

29.4001 et seq.

History: 2008 AACS.

R 29.7023 Equipment assembly.

Rule 23. Sections 2-4 to 2-4.6 are reproduced from NFPA 50A, and sections

2-4.7 to 2-4.10 of the storage and handling of gaseous and Liquefied H₂code are added

as follows:

2-4 Equipment assembly.

2-4.1 Valves, gauges, regulators, and other accessories shall be recommended for H₂

service by the manufacturer or the H₂supplier.

2-4.2 Installation of H₂systems shall be supervised by personnel familiar with

proper practices with reference to their construction and use.

2-4.3 Storage containers, piping, valves, regulating equipment, and other

accessories shall be accessible and shall be protected against physical damage and

against tampering by the general public.

2-4.4 Cabinets or housings containing H₂control or operating equipment shall be

ventilated to minimize accumulation of H₂.

2-4.5 Each mobile H₂supply unit used as part of an H₂system shall be secured to

prevent movement.

2-4.6 Mobile H₂supply units shall be electrically bonded to the system before

discharging H₂.

2-4.7 Emergency shutoff valves shall be approved and shall incorporate all of the

following means of closing:

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(a) Automatic shutoff through thermal (fire)

actuation. Where fusible

elements are used, they shall have a melting point not exceeding 250 degrees Fahrenheit

(121 degrees Celsius).

(b) Manual shutoff from a remote location.

(c) Manual shutoff at the installed location.

2-4.8 The fill line, when it is independent of the withdraw line on a storage container,

shall be equipped with a backflow check valve located as close as practical to the

container to prevent discharge of H₂from the container in case of the rupture of the line,

hose, or fittings.

2-4.9 Where excess-flow check valves are used, the closing flow shall be greater

than the maximum system design flow rate and less than the flow rating of the piping

system that results from a complete line failure between the excess-flow check valve and

the equipment downstream of the excess-flow check valve.

2-4.10 Gas piping from an outdoor compressor or storage system into a building

shall be provided with shutoff valves located outside the building. The shutoff valves

shall be readily accessible and as close as practical to the building. Each valve shall be

permanently identified.

History: 2008 AACS.

R 29.7024 Marking.

Rule 24. Sections 2-5 to 2-5.4 of the storage and handling of

Liquefied H₂code are added as follows:

gaseous and

2-5 Marking. Gaseous H₂containers and systems shall be marked in accordance with

this section.

2-5.1 Identification of contents. Each container shall be marked as follows:

"GASEOUS HYDROGEN - FLAMMABLE GAS" in letters that are not less than 3

inches (76 millimeters) in height.

2-5.2 Container specification. Stationary containers shall be marked with the

manufacturing specification and maximum allowable working pressure on a permanent

nameplate in accordance with the standard to which the container was manufactured.

2-5.3 Portable containers. Portable containers shall be marked in accordance with

CGA C-7, "Guide to the Preparation of Precautionary Labeling and Marking of

Compressed Gas Containers," adopted by reference in section 8-1.

2-5.4 Stationary containers. Stationary containers shall be marked in accordance

with NFPA 704, "Standard Systems for the Identification of the Hazards of Materials

for Emergency Response," adopted by reference in section 8-1.

History: 2008 AACS.

R 29.7025 Testing.

Rule 25. Section 2-6 is reproduced from NFPA 50A, and section 2-6.1 of the

storage and handling of gaseous and Liquefied H₂code is added as follows:

2-6 Testing. After installation, all piping, tubing, and fittings shall be tested and

proved H₂gas-tight at maximum operating pressure.

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2-6.1 Containers, if out of service in excess of 1 year, shall be inspected and tested

as outlined in section 2-6. The pressure relief devices shall be checked to determine if

they are operable and properly set.

History: 2008 AACS.

R 29.7026 Approval.

Rule 26. Sections 2-7 and 2-7.1 of the storage and handling of

Liquefied H₂code are added as follows:

2-7 Approval.

gaseous and

2-7.1 Systems and all system components shall be listed or approved, including,

but not limited to all of the following:

(a) Container.

(b) Pressure relief device, including a pressure relief valve.

(c) Pressure gauge.

(d) Pressure regulator.

(e) Valve.

(f) Hose and hose connection.

(g) Vehicle fueling connection.

(h) Electrical equipment related to the H₂system.

(i) Dispenser.

(j) Emergency shutoff valves.

(k) Metal hydride storage.

(l) Gas detection equipment and alarms.

(m) H₂generators.

(n) Pumps or compressor.

(o) Stationary engine fuel system.

History: 2008 AACS.

R 29.7027 Pressure gauges.

Rule 27. Section 2-8 of the storage and handling of gaseous and Liquefied H₂code

is added as follows:

2-8 Pressure gauges. A pressure gauge, if provided, shall be capable of reading at

least 1.2 times the system MAWP.

History: 2008 AACS.

R 29.7028 Pressure regulators.

Rule 28. Sections 2-9 to 2-9.3 of the storage and handling of

Liquefied H₂code are added as follows:

gaseous and

2-9 Pressure regulators.

2-9.1 A pressure regulator inlet and each chamber shall be designed for its service

pressure with a safety factor of at least 3.

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2-9.2 Pressure chambers shall provide for overpressure relief, if required.

2-9.3 Regulators shall be designed, installed, or protected so that their operation is

not affected by freezing rain, sleet, snow, ice, mud, insects, or debris. Regulator

protection may be integral with the regulator.

History: 2008 AACS.

R 29.7029 Valves.

Rule 29. Sections 2-10 to 2-10.2 of the storage and handling of

Liquefied H₂code are added as follows:

2-10 Valves.

gaseous and

2-10.1 Shutoff valves shall have a rated service pressure not less than the rated

service pressure of the entire system and shall be capable of withstanding a

hydrostatic test of at least 3 times the rated service pressure without rupture.

2-10.1.1 Leakage shall not occur when tested at least 1.1 times the rated service

pressure, using an inert gas compatible with industry practices.

2-10.2 Valves of a design that allows the valve stem to be removed without removal

of the complete valve bonnet or without disassembly of the valve body shall not be used.

History: 2008 AACS.

R 29.7030 Hose and hose connections.

Rule 30. Sections 2-11 to 2-11.6 of the storage and handling of gaseous and

Liquefied H₂code are added as follows:

2-11 Hose and hose connections.

2-11.1 Hose shall be constructed of or lined with materials that are resistant to

corrosion and compatible with H₂.

2-11.2 Hose, metallic hose, flexible metal hose, tubing, and their connections

shall be designed for the most severe pressures and temperatures expected under normal

operating conditions with a burst pressure of at least 3 times the service pressure.

2-11.3 Prior to use, hose assemblies shall be tested by the manufacturer or

its designated representative at a pressure at least 1.1 times the service pressure.

2-11.4 Hose and metallic hose shall be distinctly marked by the manufacturer

either by the manufacturer's permanently attached tag or by distinct markings

indicating the manufacturer's name or trademark, applicable service identifier and

design pressure.

2-11.5 The use of hose in an installation shall be limited to only the following

applications:

(a) Vehicle fueling hose.

(b) Inlet connection to compression equipment.

(c) Section of metallic hose not exceeding 36 inches in length in the pipeline

to provide flexibility where necessary.

2-11.6 Each section shall be so installed that it is protected against mechanical

damage and is readily visible for inspection.

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History: 2008 AACS.

R 29.7031 Vehicle fueling connection.

Rule 31. Sections 2-12 to 2-12.2 of the storage and handling of

Liquefied H₂code are added as follows:

gaseous and

2-12 Vehicle fueling connection.

2-12.1 Fueling receptacles and nozzles for gaseous H₂service shall be listed or

approved in accordance with a standard acceptable to the department and based on the

best interest of public health, safety, and welfare and the environment.

2-12.2 The use of adapters shall be prohibited.

History: 2008 AACS.

R 29.7032 Temporary installations.

Rule 32. Sections 2-13 and 2-13.1 of the storage and handling of gaseous and

Liquefied H₂code are added as follows:

2-13 Temporary installations.

2-13.1 ASME or U.S. DOT containers that are used as portable storage

containers, (see definition of portable container in section 1-5), for temporary, less

than 6 months at any given location, stationary service shall comply with the following:

(a) If mounted on legs or supports, then such supports shall be of steel and either

shall be welded to the container by the manufacturer at the time of fabrication or shall

be attached to lugs that have been so welded to the container. The legs or supports or

the lugs for the attachment of these legs or supports shall be secured to the container in

accordance with the code or rule under which the container was designed and built to

withstand loading in any direction equal to twice the weight of the empty

container and attachments.

(b) If the container is mounted on a trailer or semi-trailer running gear so that the

unit can be moved by a conventional over-the-road tractor, then attachment to the

vehicle, or attachments to the container to make it a vehicle, shall comply with the

appropriate U.S. DOT requirements for cargo tank service. The unit also shall comply

with applicable state and U.S. DOT motor carrier regulations and shall be approved by

the department.

History: 2008 AACS.

Chapter 3 Location of Gaseous Hydrogen Systems

R 29.7033 General requirements.

Rule 33. Sections 3-1.1, and 3-1.4 are reproduced from NFPA 50A, and sections

3-1.2, 3-1.3, and 3-1.5 to 3-1.10 of the storage and handling of gaseous and Liquefied

H₂code are added as follows:

3-1 General requirements.

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3-1.1 The system shall be located so that it is accessible to delivery equipment

and to authorized personnel. Roadways or other means of access for emergency

equipment, such as fire department apparatus, shall be provided.

3-1.2 Above ground systems shall be located either at grade or above grade.

3-1.3 Aboveground systems shall not be located beneath or where exposed to

failure of the following:

(a) Electric power lines as follows:

(i) Not less than 50 feet (15.24 meters) horizontally from the vertical plane below

the nearest overhead wire of an electric trolley, train, or bus line.

(ii) Not less than 5 feet (1.52 meters) horizontally from the vertical plane below

the nearest overhead electrical wire.

(b) Piping containing all classes of flammable or combustible

definition in Section 1-5.

liquids, see

(c) Piping containing oxidizing materials.

3-1.4 Systems within 50 feet (15.24 meters) of aboveground storage of all classes

of flammable and combustible liquids shall be located on ground higher than such

storage, except where dikes, diversion curbs, grading, or separating solid walls are used

to prevent accumulation of these liquids under the system.

3-1.5 Underground systems shall be located underground, mounded, or partially

buried and outside of any buildings. Buildings shall not be constructed over any

underground, mounded, or partially buried container. Sides of adjacent containers shall

be separated by not less than 3 feet (1 meter) unless approved by the department.

(a) Excavation for underground, mounded, or partially buried containers shall be

made with due care to avoid damage to an existing structure or its foundation.

Containers shall not be installed where loads from adjacent structures may be

transmitted to the container. A structure or foundation of a structure on the same

property shall not be erected or constructed within 10 feet (3.1 meters) of any point

on the container surface, unless the footings extend to the bottom of the container.

A container shall not be installed less than 10 feet (3.1 meters) from the nearest

wall of any basement, pit, or property line.

3-1.6 All underground containers shall be set on firm foundation and

surrounded with 6 inches (15.24 centimeters) minimum of noncorrosive inert material

such as clean sand or pea gravel.

3-1.7 Underground or mounded containers shall be covered with not less than 2 feet

(0.6 meter) of earth or with not less than 1 foot (30.48 centimeters) of earth on top of

which shall be placed a reinforced concrete slab not less than 4 inches (10.16

centimeters) thick. If containers are likely to be subjected to traffic, they shall be

protected against damage from vehicles passing over them by at least 3 feet (1 meter) of

earth cover plus 6 inches (15.24 centimeters) of reinforced concrete. When reinforced

concrete paving

is used as part of the protection, it shall extend at least 1 foot (30.48 centimeters)

horizontally beyond the outline of the container in all directions

3-1.8 Containers installed in an area subject to flooding, high water table, or other

buoyant forces shall be safeguarded from movement by anchoring or other means

acceptable to the department based on the best interests of public health, safety, and

welfare and the environment.

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3-1.9 Aboveground gaseous H₂systems shall be fenced and posted to prevent

entrance by unauthorized personnel.

Exception: Gaseous H₂dispensers may be located outside the fence.

3-1.10 Underground installations shall be deemed to provide engineered

protection from overhead power lines.

History: 2008 AACS.

R 29.7034 Specific requirements.

Rule 34. Sections 3-2.1, 3-2.4, 3-2.5, and table 3-2.1 are reproduced from NFPA

50A, and table 3-2.2, sections 3-2.2, 3-2.3 and 3-2.6 to 3-2.9 of the storage and

handling of gaseous and Liquefied H₂code are added as follows:

3-2 Specific requirements.

3-2.1 The location of a system, as determined by the maximum total contained

volume of H₂, shall be in the order of preference as indicated by Roman numerals in

table 3-2.1.

Table 3-2.1

Preferred Locations of Gaseous Hydrogen Systems

Nature of Location

Size of Hydrogen System

Less than 3500 scf (99 m³) 3500 scf to 15,000 scf In Excess of 15,000 scf (425 m ³)

(99 m³to 425 m³)

Outdoors

I

In a separate building

II

In a special room

III

IV

III

Not permitted

Inside buildings not in a

special room or exposed

to other occupancies

Not permitted

3-2.2 The minimum distance in feet from an H₂system of indicated capacity

located either outdoors, in separate buildings, or in special rooms to any specified

outdoor exposure shall be in accordance with table 3-2.2. The distances in numbers 1,

3 to 10, and 14 inclusive in table 3-2.2 shall not apply where protective structures

having a minimum fire resistance rating of 2 hours are located between the system and

the exposure.

(a) An aboveground H₂storage container system shall be erected per table 3-2.2, but

not less than 50 feet (22.9 meters), from any of the following:

A school.

A church.

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A hospital.

A theater.

Assembly occupancy for 50 or more persons.

Exception: The restrictions in section 3-2.2(a) shall not apply to an aboveground

H₂system used exclusively for stationary power generation.

Table 3-2.2

Minimum Distance from Outdoor Gaseous Hydrogen Systems to Exposures

Total Gaseous Hydrogen Storage

Type of Outdoor

Exposure

Less than

3500 scf to

15,000 scf

In

excess of

15,000 scf

(425 m³)

3500 scf (99 m³)

(99 m³to 425 m³)

Feet

(meter)

Feet

(meter)

Feet

(meter)

1. Building or structure

(a) Wall(s) adjacent to system

constructed of noncombustible or

limited‐combustible materials

0^a(0)

5^a(1.5)

(1) Sprinklered building or structure

or unsprinklered building or structure

having noncombustible contents

(2) Unsprinklered building or

structure with combustible contents

Adjacent wall(s) with fire resistance

rating less than 2 hours^b

0^c(0)

0 (0)

10 (3.1)

5 (1.5)

25^d

(7.6)

Adjacent wall(s) with fire resistance

rating of 2 hours or greater^b

(b) Wall(s) adjacent to system

constructed of other than

noncombustible or

5 (1.5)

10 (3.1)

25 (7.6)

50^d(15.2)

limited‐combustible materials

2. Wall openings

(a) Not above any part of a system

(b) Above any part of a system

10 (3.1)

25 (7.6)

10 (3.1)

25 (7.6)

10 (3.1)

25

(7.6)

3. All classes of flammable and

combustible liquids above ground

(a) 0‐1000 gal (3785L)

10 (3.1)

25 (7.6)

50 (15.2)

25 (7.6)

(b) In excess of 1000 gal (3785L)

50

(15.2)

4. All classes of flammable and

combustible liquids below ground

0‐100 gal (3785L)^e

10 (3.1)

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(a) Tank

(b) Vent or fill opening of tank

25 (7.6)

25

(7.6)

5. All classes of flammable and

combustible liquids below ground – in

excess of 1000 gal (3785L)^e

(a) Tank

20 (6.1)

25 (7.6)

20 (6.1)

25 (7.6)

20 (6.1)

(b) Vent of fill opening of tank

25

(7.6)

6. Flammable gas storage (other

than H₂), either high pressure or low

pressure

10 (3.1)

25 (7.6)

50 (15.2)

25 (7.6)

(a) 0‐15,000 scf (255 m^e) capacity

(b) In excess of 15,000 scf (255 m^e)

capacity

50

(15.2)

7. Oxygen storage

Refer to NFPA 51, Standard for the Design and Installation of

Oxygen‐Fuel Gas Systems for Welding, Cutting, and Allied

Processes

Refer to NFPA 55, Standard for the Storage, Use, and

Handling of Compressed Gases and Cryogenic Fluids in Portable

and Stationary Containers, Cylinders, and Tanks

(a) 20,000 scf (566 m^e) or less

(b) More than 20,000 scf (566 m^e)

8. Fast‐burning solids such as

ordinary lumber, excelsior, or paper

50 (15.2)

5

0

(15.2)

9. Slow‐burning solids such as heavy

timber or coal

10. Open flames and welding

25 (7.6)

50 (15.2)

25 (7.6)

50 (15.2)

2

5 (7.6)

2

5 (7.6)

11. Air compressor intakes or inlets

to ventilating or air‐conditioning

equipment

5

0

(15.2)

12. Places of public assembly less

than 50 people

25 (7.6)

50 (15.2)

5

0

(15.2)

13 Public sidewalks and parked

vehicles

14 Line of adjoining property that

can be built upon

15 (4.6)

5 (1.5)

15 (4.6)

5 (1.5)

1

5 (4.6)

5

(1.5)

15. Flammable/Combustible liquid

dispenser

16. Public Way, driveway

10 (3.1)

15 (4.6)

50 (15.2)

10 (3.1)

15 (4.6)

50 (15.2)

1

0 (3.1)

1

5 (4.6)

17. Railroad

5

0

(15.2)

^aPortions of wall less than 10 ft (3m) (measured horizontally) from any part of a system shall have a

fire resistance rating of at least ½ hour.

^bExclusive of windows and doors (see number 2 of Table 3‐2.2).

^cPortions of walls less than 10 ft (3m) (measured horizontally) from any part of a system shall have a fire

resistance rating of at least 1 hour.

^dBut not less than 1/2 the height of adjacent wall of building or structure.

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^eDistances can be reduced to 15 ft (4.5m) for Class IIIB combustible liquids.

3-2.2.1 Loose or piled combustible material and weeds and long dry grass shall not

be within 10 feet (3.1 meters) of any system.

Roof top storage.

Construction of the building/roof that carries the load of the storage tank must carry

a minimum 1-hour fire rating.

System must be securely mounted to roof.

System must be located to allow for inspection of the system acceptable to the

department based on the best interest of public health, safety, and welfare and the

environment.

3-2.3 Unloading connections on delivery equipment shall not be positioned closer

to any of the exposures cited in table 3-2.2 than the distances given for the storage

system.

(a) H₂transfer between cargo transport vehicle and stationary container

systems (single or multiple containers utilizing a common or manifolded transfer

line), shall comply with all of the following:

(i) Owners and operators shall ensure that fixed piping is used between the

container and master shutoff and check valves. The piping and manifolds shall be

secured to the container frame. Flexible hoses are only permitted between the check

valve and the cargo vehicle unloading connection.

(ii) Emergency shutoff valves required in this section shall be tested annually

for proper operation. The results of the tests shall be documented.

(iii)All installations shall have at least 1 clearly identified and easily accessible

manually operated remote emergency shutoff device. Within 1 year after the effective

date of these rules, existing installations shall have at least 1 clearly identified and easily

accessible manually operated remote emergency shutoff device. The emergency

shutoff device shall be located not less than 20 feet (6.1 meters) nor more than 100

feet (30.5 meters) in the path of egress from the emergency shutoff valve and not

less than 20 feet (6.1 meters) from the container system.

(iv)During transfer of H₂to and from cargo vehicles, the hand or emergency

brake of the vehicle shall be set, and chock blocks shall be used to prevent rolling of the

vehicle.

(v) Transfer systems shall be capable of depressurizing to facilitate

disconnection. Bleed connections shall lead to a safe point of discharge.

(vi) Cargo vehicle shall be equipped with air-brake interlock in front of the

unloading connection to protect against drive-away.

(b) The delivery vehicle shall be located so that all parts of the vehicle are on

the premises when delivery is made. Check valves shall be located as close to the

container as practical.

(i) Sources of ignition shall not be permitted in the unloading area while transfer

is in progress.

3-2.4 H₂systems of less than 3500 scf (99 m3), where located inside buildings

and exposed to other occupancies, shall be situated in the building so that the system will

be as follows:

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(a) In an adequately ventilated area as in 4-2.2.

(b) 20 feet (6.1 meters) from all classes of flammable and combustible

liquids, oxidizing gases, and readily combustible materials, such as excelsior

and paper.

(c) 25 feet (7.6 meters) from open flames, ordinary electrical equipment, or other

sources of ignition .

(d) 50 feet (15.24 meters) from intakes of ventilation or air-conditioning

equipment and air compressors.

(e) 50 feet (15.24 meters) from other flammable gas storage.

(f) Protected against damage or injury due to falling objects or working

activity in the area. More than one system of 3500 scf (99 cubic meters) or less shall be

permitted to be installed in the same room, provided the systems are separated by at

least 50 feet (15.24 meters) or where a masonry structure having a minimum fire

resistance rating of 2 hours is located between the systems. Each such system shall meet

all of the requirements of this section.

Exception: The separation distance between multiple systems of 3500 scf (99 cubic

meters) or less shall be permitted to be reduced to 25 feet (7.6 meters) in buildings

where the occupancy between storage areas is free of combustible materials and

protected with a sprinkler system designed for Ordinary Hazard, Group 1

occupancies or Light Hazard occupancies in accordance with NFPA 13, Standard for

the Installation of Sprinkler Systems.

3-2.6 An owner and operator shall ensure that a container system, which is

underground, mounded, or partially underground, is protected from corrosion by 1 of

the following:

(a) The approved container system is cathodically protected by all the

following requirements:

(i) The approved container system is coated with a suitable dielectric

material approved by the department.

(ii) Factory-installed or field installed cathodic protection systems are designed

by a corrosion expert or in accordance with the NACE recommended practice

RP0285 entitled "Corrosion Control of Underground Storage Tank Systems by

Cathodic Protection," or impressed current systems are designed to allow a

determination of current operating status as required in section 5.4-1 of the H₂

code.

(iii) Cathodic protection systems are operated and maintained in accordance

with the provisions of section 5.4-1 of the H₂code.

(b) The container is made of nonmetallic construction or corrosion-

resistant, such as fiberglassor a composite.

(c) Or other means acceptable to the department and based on the best interest

of public health, safety, and welfare and the environment.

3-2.7 Out-of-service aboveground containers.

Containers that are no longer in service for a period of 12 months shall be closed.

To close the aboveground container, the owner or operator shall empty the container,

purge it with an inert gas and safeguard it against tampering. Piping that is removed

from service shall be purged with nitrogen and capped or removed.

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3-2.7.2 Each container that is to be reused at the original location or a new location

shall be purged with an inert gas and be in compliance with all the requirements for the

installation of a new container, and shall be recertified by the manufacturer or

authorized representative, and tested in accordance with the container's design

specifications or be pressure tested with an inert gas or H₂at 1.1 times the MAWP for

not less than 10 minutes. Piping that is to be reused shall comply with all the

requirements for the installation of new piping and shall be tested in compliance with

section

3-2.9 of this code prior to being brought back into service.

3-2.8 Out-of-service underground, mounded, and partially buried containers.

3-2.8.1 Containers that are no longer used to store H₂and are not intended to be

brought back into service shall be permanently closed. To permanently close the

container, the container shall be emptied and purged with an inert gas to render the

container free of H₂, and then the container shall be removed from the ground. When

a structure above or near the container prevents removal, the container shall be

emptied and purged with an inert gas to render the container free of H₂, then the container

shall be filled with an inert solid material. Piping that is permanently removed from

service shall be purged with an inert gas and capped or removed.

3-2.8.2 Containers may be rendered temporarily out-of-service only when it is

intended they be brought back into service at a later date. To temporarily close a

container, all of the following requirements shall be met:

(a) The container shall be emptied and purged with an inert gas.

(b) Corrosion protection for the container and all underground piping shall be

maintained in compliance with section 5-4.1 of this code.

(c) The vent line shall remain functional.

(d) The container shall be secured against tampering.

(e) Piping that is temporarily removed from service shall be purged with an inert

gas and capped.

3-2.8.2.1 Each container that is temporarily out of service for greater than 12 months

shall be pressure tested with an inert gas at 1.1 times the MAWP for not less than 10

minutes prior to being brought into service.Temporarily out of service piping shall be

tested in compliance with section 3-2.9 of this code prior to being brought back into

service.

3-2.9 Testing. After installation, prior to being placed into service, all container

connections and all fielderected piping, tubing, hose, and hose assemblies shall be

tested and proved H₂gas-tight for the rated pressure, volume, and temperature of the

gas transported by an approved method as outlined in ASME B31.3, "Process

Piping," adopted by reference in section 8-1, or the following:

(a) Perform a pressure test at 1.1 times MAWP, a minimum of 10 minutes.

(b) During pressure test, check for pressure decay. If leakage is detected, use

leak detection fluid to find local leaks. Energize the piping with H₂at the MOP, and

check for local leaks with a "sonic tester," "sniffer," or method acceptable to the

department based on the best interests of public health, safety, welfare and the

environment. If the test "fails" the requirements in subsections (a), (b), or (c) of this

section, the system must be purged with an inert gas, repaired, and subsections (a),

(b), and (c) of this section shall be repeated until the test "passes."

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History: 2008 AACS.

R 29.7035 Vaults for aboveground containers.

Rule 35. Sections 3-3 to 3-3.2 of the storage and handling of gaseous and Liquefied

H₂code are added as follows:

3-3 Vaults for aboveground containers. Vaults may be installed aboveground,

underground or partially buried.

3-3.1 General. Aboveground containers may be installed in vaults that meet the

requirements of section 3-3. Except as modified by the provisions of section 3-3,

vaults shall meet all other applicable provisions of these rules.

3-3.2 Vault design and construction. Vaults shall be designed and constructed

to meet the following requirements:

(a) The walls and floor of the vault shall be constructed of reinforced

concrete at least 6 inches (15.24 centimeters) thick.

(b) The top of an aboveground vault shall be

constructed

of

noncombustible material and shall be designed to be weaker than the walls of the vault

to ensure that, in the event of any explosion, the thrust occurring inside the vault is

directed upward before destructive internal pressure develops within the vault. The top

of an at-grade or below-grade vault shall be designed to relieve or contain the force of

any explosion occurring inside the vault. The walls of a vault, which are partially

below-grade, shall extend not less than 4 feet (1.2 meters) above grade.

(c) The top and floor of a below-grade vault and the container foundation

shall be designed to withstand all anticipated loading from vehicular traffic, where

applicable.

(d) The walls and floor of a below-grade vault shall be designed to withstand

anticipated soil and hydrostatic loading. The vault shall be liquid tight.

(e) Adjacent vault may share a common wall.

(f) The vault enclosure shall not have openings except those necessary for access

to, inspection of, and filling, emptying, and venting of the container.

(g) When required, the vault shall be designed to be wind and earthquake

resistant, in accordance with good engineering practice.

(h) The vault shall be provided with an open and continuous vent to provide

ventilation to dilute, disperse, and remove any vapors. This continuous vent line

shall terminate 12 feet (3.7 meters) abovegrade.

(i) Each vault shall be provided with a means for personal entry, which shall only

be at the top of the vault to allow for the visual inspection of the container and piping

surfaces. At each entry point, a warning sign that indicates the need for procedures

for safe entry into a confined space shall be posted. Each entry point shall be

secured against unauthorized entry and vandalism.

(j) The vault shall be provided with an approved means to

suppression agent.

admit

a fire

(k) The loading and unloading transfer connection for abovegrade vaults shall

terminate outside the vault.

(l) Provisions shall be made for the normal operation of valves without

entering the vault.

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(m) A vault shall be located not less than 15 feet (4.6 meters) from buildings

and property lines.

(n) Container selection and arrangement. Containers shall be

listed for

aboveground use. Each container or manifolded system, shall be in its own vault and

shall be completely enclosed by the vault, and securely fastened to the floor of the

vault. Sufficient clearance between the container and the vault shall be provided to

allow for visual inspection and maintenance of all the vault surfaces as well as the

tank and its appurtenances.

(o) The vault shall be provided with a continuous H₂gas leak detection

device with an audible alarm set at 25% of the LEL and will render the system

inoperable. The H₂leak detection device shall function during system maintenance

operations.

History: 2008 AACS.

R 29.7036 Location of dispensing operations and equipment.

Rule 36. Sections 3-4 to 3-4.5 of the storage and handling of

Liquefied H₂code are added as follows:

gaseous and

3-4 Location of dispensing operations and equipment.

3-4.1 Dispensing equipment located outdoors shall be in accordance with the

following:

(a) Dispensing equipment shall be allowed under weather protection in

accordance with the requirements of section 4-5 and constructed in a manner that

prevents the accumulation of H₂gas.

3-4.2 Gaseous H₂compression and storage equipment located on top of motor fuel-

dispensing facility canopies shall be in accordance with the following:

(a) Canopies shall be constructed in accordance with the

requirements for

weather protection found in section 2209.3.2.6 of the International Fire Code.

(b) Fuel-dispensing areas under canopies shall be equipped throughout with an

approved automatic sprinkler system. Operation of the fire sprinkler system shall

activate the emergency functions of the following:

(i) Operation of the fire sprinkler system shall

activate

an automatic

emergency discharge system, which will discharge the H₂gas from the equipment

on the canopy top through the vent pipe system.

(ii) Operation of the fire sprinkler system shall activate the emergency

shutdown control in section 7-6.

(iii) Approved signage having a minimum of 3-inch (7.62 centimeters) block

letters shall be affixed on all sides on the exterior of the canopy structure stating either

CANOPY TOP HYDROGEN STORAGE or using NFPA 704, "Standard System for

the Identification of Fire Hazards of Materials," 1996 edition, adopted by reference in

section 8-1.1.

(iv) System must be in compliance with section 3-2.2.2.

3-4.3 Dispensing equipment located outdoors shall be aboveground, shall not be

beneath electric power lines or where exposed by their failure, and shall be a minimum

of 10 feet (3.1 meters) from the nearest important building or property line or 20 feet

(6.1 meters) from any activity that involves a fixed source of ignition.

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3-4.4 Dispensing equipment shall be located so that all parts of the vehicle being

served are on the premises of the motor fuel dispensing facility.

3-4.5 Dispensing equipment shall be protected against collision damage by means

acceptable to the department. Dispensing equipment shall be securely bolted in place.

Dispensing equipment shall be installed in accordance with manufacturer's instructions.

History: 2008 AACS.

R 29.7037 Installation of emergency shutdown equipment.

Rule 37. Sections 3-5 to 3-5.2 of the storage and handling of gaseous and Liquefied

H₂code are added as follows:

3-5 Installation of emergency shutdown equipment.

3-5.1 Breakaway protection shall be provided in a manner such that, if a pull away

event occurs, H₂gas will cease to flow at any separation.

3-5.2 A breakaway device shall be installed at every dispensing point. Such a device

shall be arranged to separate by a force not greater than 150 pounds (75 kilograms), when

applied in any direction that the vehicle would move. Breakaway devices shall be

compatible with a standard acceptable to the department.

History: 2008 AACS.

Chapter 4 Design considerations at specific locations

R 29.7038 Outdoor locations.

Rule 38. Sections 4-1, 4-1.1, and 4-1.2 were reproduced from NFPA 50A as

follows:

4-1 Outdoor Locations.

4-1.1 Where protective walls or roofs are provided, they shall be constructed of

noncombustible or limited-combustible materials.

4-1.2 Electrical equipment within 15 feet (4.6 m) shall be in accordance with Article

501 of NFPA 70, National Electrical Code®, for Class I, Division 2 locations.

History: 2008 AACS.

R 29.7039 Separate buildings.

Rule 39. Sections 4-2.1, 4-2.4 to 4-2.6 are reproduced from NFPA 50A, and

sections 4-2.2, and 4-2.3 of the storage and handling of gaseous and Liquefied H₂

code are added as follows:

4-2 Separate buildings.

4-2.1 Separate buildings shall be constructed of noncombustible or limited-

combustible materials. Windows and doors shall be located so as to be readily accessible

in case of emergency.

Exception: Window glazing shall be permitted to be plastic.

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4-2.2 Ventilation to the outdoors shall be provided. Inlet openings shall be located

within 18 inches (30 centimeters) of the floor in exterior walls only. Outlet openings

shall be located at the high point of the room in exterior walls or roof. Inlet and outlet

openings shall each have a minimum total area of 1 square foot/1,000 cubic feet (1

square meters/305 cubic meters) of room volume. Discharge from outlet openings shall

be directed or conducted to the atmosphere.

4-2.3 Deflagration venting shall be provided in exterior walls or roof only.

4-2.3.1 Vents shall be any 1 or any combination of the following:

(a) Walls of light material.

(b) Lightly fastened hatch covers.

(c) Lightly fastened, outward opening doors in exterior walls.

(d) Lightly fastened walls or roof.

(e) Other methods in accordance with NFPA 69.

4-2.3.2 Where applicable, snow loads shall be considered.

4-2.4 There shall be no sources of ignition from open flames, electrical equipment,

or heating equipment.

4-2.5 Electrical equipment shall be in accordance with Article 501 of NFPA 70,

National Electrical Code, for Class I, Division 2 locations.

4-2.6 Heating, if provided, shall be by steam, hot water, or other indirect means

except that electrical heating may be used if in compliance with 4-2.5.

History: 2008 AACS.

R 29.7040 Special rooms.

Rule 40. Sections 4-3.2 to 4-3.6 are reproduced from NFPA 50A, and sections

4-3.1, 4-3.7 to 4-3.9, and table 4-3.9 of the storage and handling of gaseous and

Liquefied H₂code are added as follows:

4-3 Special rooms.

4-3.1 Floor, walls, and ceiling shall be constructed of noncombustible or limited-

combustible materials. Interior walls or partitions shall have a fire resistance rating of

at least 2 hours, shall be continuous from floor to ceiling, and shall be securely anchored.

At least 1 wall shall be an exterior wall. Windows and doors shall be located so as

to be readily accessible in case of emergency.

Exception: Window glazing may be of plastic.

4-3.1.1 If access to the room from outside the primary structure is not possible,

access from within the primary structure shall be made through 1 vapor-sealing 2-hour

self-closing fire door.

4-3.2 Ventilation shall be as provided in section 4-2.2.

4-3.3 Explosion venting shall be as provided in section 4-2.3.

4-3.4 There shall be no sources of ignition from open flames, electrical equipment,

or heating equipment.

4-3.5 Electrical equipment shall be in accordance with Article 501 of NFPA 70,

National Electrical Code, for Class I, Division 2 locations.

4-3.6 Heating, if provided, shall be by steam, hot water, or indirect means except

that electrical heating shall be permitted to be used if in compliance with 4-3.5.

4-3.7 Room ventilation.

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4-3.7.1 The ventilation shall be at least 1 cubic feet/minute/square feet (0.3 cubic

meters/minute/square meters) of room area, but not less than 1 cubic foot/minute/12

cubic feet (0.3 cubic meters/minute/3.7 cubic meters) of room volume and shall be

designed such that an accumulation of H₂at a concentration equal to or greater than

25% of the lower flammability limit shall not occur in any part of the room.

4-3.7.2 Where installed, a gas detection system shall be equipped to sound an alarm

and visually indicate when a maximum of 25% of the lower flammable limit is reached.

At 40% of the lower flammable limit the gas detection system shall shut down the

hydrogen system and provide notification to the system operator.

4-3.7.3 Any failure of the ventilation system shall immediately shut down the fueling

system and provide notification to the system operator. Reactivation of the fueling

system shall be by manual restart and shall be conducted by trained personnel.

4-3.7.4 The gas detection system shall function during ventilation system

maintenance operations.

4-3.7.5 A ventilation system for a room within or attached to another building

shall be designed to ensure that all areas serviced by the ventilation system meet

performance requirements in accordance with section 4-3.7 during the normal operating

conditions and during alarm conditions.

4-3.8 Warning signs.

4-3.8.1 Access doors shall have warning signs with the words "WARNING - NO

SMOKING - NON ODORIZED FLAMMABLE GAS - NO OPEN FLAMES. The

wording shall be in plainly legible, bright red letters not less than 1 inch (2.54

centimeters) high on a white background.

4-3.9 Indoor attended fast-fill fueling.

4-3.9.1 Attended indoor fast-fill fueling system shall be in accordance with

subsections (a) to (k) of this section.

(a) Gas storage equipment shall be located outdoors unless approved

by the

department. Gas processing and compression equipment shall be listed or approved

for indoor use or located outdoors.

(b) An emergency manual shutdown device shall be located in the dispensing

area not less than 20 feet (6.1 meters) and not more than 100 feet (30.5 meters) in the

path of egress from the dispensing area. Actuation of the emergency manual

shutdown device shall perform in accordance with subsection (h) of this section.

(c) The dispenser shall be equipped with a gas detection system which shall

actuate in accordance with subsection (h) of this section when a maximum of 25%

of LFL is detected (1% H₂in air).

(d) The dispenser shall be equipped with a leak detection system capable of

identifying a leak from the dispensing system outside the

dispenser housing by

conducting a pre-fill pressure test. The leak detection must be capable of detecting a

minimum leak rate of 1.9 gallons/minute and shall actuate in accordance with

subsection (h) of this section when a leak is detected.

(e) Whether the fill is communicated or non-communicated, the dispensing

system must be listed, labeled, or approved to insure that the fills are protective of the

safety of the temperature, pressure and flow rate of the on-board fuel system during

fueling.

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(f) The dispensing area shall be equipped with a fire detection system and shall

actuate in accordance with subsection (h) of this section if a fire is detected.

(g) A ventilation system shall be installed for the dispensing area. The ventilation

system shall be capable of delivering ventilation air as provided in section 4.3.7. The

ventilation system shall operate prior to dispenser operation, during fueling, and for at

least 1 minute after fueling has been completed. The ventilation flow rate shall be

monitored. Failure or reduction of the ventilation flow rate below the required flow

rate shall shut down the dispensing system.

Exception: A dispensing area ventilation system is not required when the fuel

delivery per refueling event is less than those listed in table 4-3.9.

Table 4-3.9

Maximum fuel delivery per refueling event that

Room Size (m3)

1000

does not require room ventilation (kg)

0.8

1.7

2.5

3.3

4.2

2000

3000

4000

5000

(h) The actuation of any 1 of the systems listed in subsections (b) to (g) of this

section shall be in accordance with table 4-3.9, and shall shut down the dispenser, stop

the flow of gas into the room, and start or continue to run the ventilation system, if

required.

1. Reactivation of the dispenser and gas flow into the room shall be by manual

restart and shall be conducted by trained personnel.

(i) Interior walls, doors, and window openings within 15 feet (4.6 meters) of the

dispenser shall be constructed of materials having a fire rating of at least 2 hours. Wall

penetrations shall require use of listed fire rated equipment.

(j) The owner/operator shall not allow hot work/open flames within 15 feet (4.6

meters) of the refueling location unless the dispenser is shut down, depressurized, and

purged.

(k) If H₂is to be removed from the vehicle storage system, H₂shall be

discharged into a closed transfer system or vented outdoors in accordance with

CGA G-5.5, "Hydrogen Vent Systems", adopted by reference in section 8-1.

History: 2008 AACS.

R 29.7041 Indoor H₂storage system location.

Rule 41. Sections 4-4 to 4-4.6, and table 4-4.1of the storage and handling of

gaseous and Liquefied H₂code are added as follows:

4-4 Indoor H₂storage system location.

4-4.1 H₂systems of less than 3,500 scf (99 cubic meters) and greater than the

maximum allowable quantity found in table 4.4.1, where located inside buildings

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outside of special rooms, shall be located in the building so that the system will be as

follows:

(a) In a ventilated area in accordance with the provisions of section 4-3.7.

(b) Separated from incompatible materials.

(c) 15 feet (4.6 meters) from ordinary electrical equipment, and 25 feet (7.6

meters) from open flames or welding or other sources of ignition.

(d) 50 feet (15.2 meters) from other low-pressure flammable gas storage (less than

500 psig).

(e) Protected against damage in accordance with the provisions of section 2.1.5.

Table 4-4.1 Quantity Thresholds for Gases Requiring Special Provisions

Unsprinklered areas

Sprinklered areas

No gas cabinet, gas

room, or exhausted

enclosure

Gas cabinet, gas

room, or exhausted

enclosure

No gas cabinet, gas

room, or exhausted or exhausted enclosure

enclosure

Gas cabinet, gas room,

Material

Cryogenic liquid

(flammable or oxidizing)

45 gal

90 gal

180 gal

27 kg₃(60 lb)

14 kg₃(30 lb)

27 kg₃(60 lb)

55 kg₃(120 lb)

Flammable gas

liquefied nonliquefied

28 m³

28 m³(1,000 ft³)

28 m³(2,000 ft³)

56 m³(4,000 ft³)

(2,000 ft³)

4-4.2 More than 1 system of 3,500 scf (99 cubic meters) or less shall be permitted

to be installed in the same room or area outside of special rooms, provided the systems

are separated by at least 50 feet (15.2 meters), or by a full height fire-resistive partition

having a minimum fire resistance rating of 2 hours is located between the systems.

4-4.3 Each system described in section 4-4.2 shall meet all of the requirements

of section 4-4.1.

4-4.4 The separation distance between multiple systems of 3,500 scf (99 cubic

meters) or less shall be permitted to be reduced to 25 feet (7.6 meters) in buildings

where the space between storage areas is free of combustible materials and protected

with a sprinkler system.

4-4.5 When sprinkler protection is provided, the area in which H₂is stored or used

shall be protected with a sprinkler system designed to be not less than that required by

NFPA 13, "Standard for the Installation of Sprinkler Systems," adopted by reference in

section 8-1, for ordinary hazard group 2 with a minimum design area of 3,000 square

feet (914.4 square meters).

4-4.6 When sprinkler protection is provided, the area in which the H₂is stored or

used shall be protected with a sprinkler system designed to be not less than that required

by NFPA 13, "Standard for the Installation of Sprinkler Systems," adopted by

reference in section 8-1, for extra hazard group 1 with a minimum design area of 2,500

square feet (762 square meters).

History: 2008 AACS.

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R 29.7042 Canopies.

Rule 42. Sections 4-5 to 4-5.2 of the storage and handling of

Liquefied H₂code are added as follows:

4-5 Canopies.

gaseous and

4-5.1 A container installation that has a canopy or roof shall have prior approval by

the department based on the best interests of public health, safety, and welfare and the

environment. This canopy or roof shall not limit the dissipation of heat or dispersion of

flammable vapors and cannot restrict firefighting access and control.

4-5.2 A roof or canopy must meet all of the following conditions:

(a) The lowest elevation of the roof or canopy shall not be less than 4 feet (1.8

meters) from the top of the container.

(b) All container vent(s) are extended through the roof or canopy.

(c) The roof or canopy is constructed in such a way that it will not allow vapors

to accumulate under the canopy or roof.

(d) Be constructed of noncombustible materials

History: 2008 AACS.

R 29.7043 Fast-fill station.

Rule 43. Sections 4-6 to 4-6.2 of the storage and handling of

Liquefied H₂code are added as follows:

gaseous and

4-6 Fast-fill station.

4-6.1 Each line between a gas storage facility and a dispenser at a fast-fill station shall

have a valve that closes when 1 of the following occurs:

(a) The power supply to the dispenser is cut off.

(b) Any emergency shutdown device at the refueling station is activated.

4-6.2 A manual shutoff valve shall be provided at a fast-fill station upstream of

the breakaway device specified in section 3-5, where it is readily accessible to the

person dispensing H₂, unless either of the following occurs:

(a) The self-closing valve referred to in

immediately upstream of the dispenser.

section

4-6.1

is located

(b) The dispenser is equipped with a self-closing valve that closes each time the

dispenser is deactivated or when an emergency device is activated.

History: 2008 AACS.

R 29.7044 Vehicle fueling appliances in nonresidential occupancies.

Rule 44. Sections 4-7 to 4-7.7 of the storage and handling of

Liquefied H₂code are added as follows:

gaseous and

4-7 Vehicle fueling appliances (VFA) in nonresidential occupancies.

4-7.1 VFAs shall not exceed a gas flow of 36 scf/minute.

4-7.2 VFAs shall be listed.

4-7.3 VFAs may be used to fill stationary containers at vehicular fueling locations.

4-7.4 A VFAs installed with storage containers shall comply with the provisions

of chapters 2, 3, and 4.

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4-7.5 The installation of VFAs at a residence shall comply with the

requirements of section 4-9.

4-7.6 Where more than 1 VFA are located in a common area, spacing between the

VFAs shall not be less than 3 feet (1 meter), unless permitted in the manufacturer's

recommendations.

4-7.7 Unless specifically permitted in the manufacture's recommendations,

multiple VFAs shall not be manifolded together on the discharge side.

History: 2008 AACS.

R 29.7045 Installation of electrical equipment.

Rule 45. Sections 4-8 to 4-8.2 of the storage and handling of

Liquefied H₂code are added as follows:

gaseous and

4-8 Installation of electrical equipment.

4-8.1 Electrical equipment and wiring shall be specified and installed in accordance

with NFPA 70, "National Electrical Code," adopted by reference in section 8-1.

4-8.2 Static protection shall be required when gaseous H₂cargo transport vehicles

are loaded or unloaded. This can be achieved when cargo transport vehicles or marine

equipment are loaded or unloaded by grounding cable, conductive hose, flexible

metallic tubing, or pipe connections where both halves of metallic couplings are in

contact.

History: 2008 AACS.

R 29.7046 Residential fueling facility.

Rule 46. Sections 4-9 to 4-9.11 of the storage and handling of gaseous and Liquefied

H₂code are added as follows:

4-9 Residential fueling facility (RFF).

4-9.1 Application. This section applies to the design, construction, installation,

and operation of an RFF.

4-9.2 Storage of H₂in quantities not exceeding 3,500 scf (99 cubic meters) at 12,500

psig shall be permitted in systems listed by a national recognized testing laboratory.

4-9.2.1 The RFF may store H₂indoors or outdoors. Indoor storage of H₂shall not

exceed 3,500 scf (99 cubic meters) at 7,700 psig provided that indoor storage is

ventilated per section 4-3.7, or storage shall be in a separate sealed enclosure ventilated

directly to outdoors.

4-9.3 System component qualifications. System components not part of a listed

fueling appliance shall comply with the appropriate provisions of chapter 2.

4-9.3.1 Fueling appliances shall be listed.

4-9.4 General safety requirements. All equipment related to RFF installation shall be

protected to minimize the possibilities of physical damage and vandalism. The use of

an enclosure for the compressor package, similar to that of a central air conditioner,

shall be permitted to satisfy this requirement.

4-9.4.1 All equipment related to RFF installation shall be designed for the pressure,

temperature, and service expected.

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4-9.4.2 Vehicles shall not be considered a source of ignition.

Exception: Vehicles containing fuel-fired equipment, such as recreational vehicles,

shall be considered a source of ignition unless this equipment is shutoff completely

before entering an area in which ignition sources shall not be permitted.

4-9.4.3 Unless specifically permitted in the manufacturer's recommendations,

multiple RFFs shall not be manifolded together on the discharge side.

4-9.4.4 Where more than 1 RFF is located in a common area, spacing between the

RFFs shall not be less than 3 feet (1 meter) unless permitted by the manufacturer's

recommendations.

4-9.5 Installation.

4-9.5.1 General.

All RFF equipment shall include

manufacturer's

recommendations and such recommendations shall include, but may not be limited

to, the requirements for the proper installation, operation, and maintenance of the RFF.

The RFF shall be installed, operated, and maintained in accordance with the

manufacturer's recommendations.

4-9.5.1.1 The RFF shall have a nameplate marked with minimum and maximum gas

inlet pressure and flow rate, gas outlet maximum pressure, and electrical requirements.

4-9.5.2 Indoors. Where it is necessary to install the compression unit and refueling

connections indoors, the compression unit shall be mounted or otherwise located such

that the compression unit is vented outdoors.

4-9.5.2.1 Where the RFF or the vehicle being fueled is located indoors, a gas detector

set to operate at 1/5 25% the lower limit of flammability of H₂shall be installed in the

room.

4-9.5.2.2 The detector shall be located within 6 inches (15.2 centimeters) of the

ceiling or the highest point in the room.

4-9.5.2.3 The detector shall stop the flow of H₂and operate an audible or a visual

alarm.

4-9.6 Installation of pressure relief valves shall have pressure relief device vents

or vent lines to convey escaping gas to the outdoors and then upward to a safe area to

prevent impinging on buildings, other equipment, or areas open to the public, such as

sidewalks.

4-9.7 Piping and hose. A fueling hose shall be limited to a maximum length of 25

feet (7.62 meters) and shall be protected from mechanical damage from abrasion and

from being driven over by a vehicle.

4-9.7.1 Transfer systems shall be capable of depressurizing the nozzle to facilitate

disconnection. Bleed connections shall lead to a safe point of discharge.

4-9.8 Testing. All piping and tubing shall be tested after assembly according to

section 2-6.

4-9.9 Installation of emergency shutdown equipment. An RFF shall be equipped with

emergency manual shut down of the fuel supply prior to the RFF device. The emergency

manual shutdown actuator shall be at least 5 feet (1.52 meters) from the RFF and in view

of the RFF.

4-9.9.1 Breakaway protection shall be provided in a manner so that, in the event of

a pull away, H₂ceases to flow.

4-9.9.1.1 The breakaway devices shall comply with ANSI/CSA HGV 4.4,

"breakaway devices for dispensing systems," adopted by reference in section 8-1.

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4-9.9.1.2 A breakaway device shall be installed at every dispensing point.

4-9.9.1.3 The breakaway device in 4-9.8.2.3 shall be arranged to separate using a

force not greater than 150 pounds (75 kilograms) when applied in a horizontal

direction.

4-9.10 Operation. An RFF shall be operated in accordance with the

manufacturer's instructions.

4-9.10.1 A fuel supply container shall not be charged in excess of its maximum

allowable service pressure at normal temperature.

4-9.10.2 U.S. DOT containers shall be charged in accordance with U.S. DOT

regulations.

4-9.10.3 Where H₂is being transferred to a motor vehicle, the engine shall be turned

off.

4-9.11 Maintenance and inspection. All RFF equipment shall be inspected and

maintained in accordance with the manufacturer's instructions.

History: 2008 AACS.

Chapter 5 Operation and Maintenance

R 29.7047 Operation.

Rule 47. Section 5-1 is reproduced from NFPA 50A, and sections 5-1.1 to 5-1.3

of the storage and handling of gaseous and Liquefied H₂code are added as follows:

5-1 Operation. For installations that require any operation of equipment by the user,

instructions shall be maintained at operating locations.

5-1.1 A vehicle container shall not be charged in excess of the service pressure

compensated for the differences in temperature from nominal.

5-1.2 H₂vehicle containers shall not be subjected to pressure in excess of 125% of

the marked service pressure even if, on cooling, the pressure settles to the marked service

pressure.

5-1.3 Where an overpressure incident that results in operation of the

overpressure protection system of the dispenser occurs, the dispenser pressure

control system shall be examined and certified by a qualified operator prior to being

returned to service.

History: 2008 AACS.

R 29.7048 Maintenance.

Rule 48. Section 5-2 is reproduced from NFPA 50A, and sections 5-2.1 to 5-

2.11 of the storage and handling of gaseous and Liquefied H₂code are added as

follows:

5-2 Maintenance. Each hydrogen system installed on consumer premises shall be

inspected annually and maintained by a qualified representative of the equipment

owner.

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5-2.1 Hoses, nozzles and breakaways shall be examined visually to ensure that they

are safe for use and shall be maintained in accordance with manufacturer's

instructions on at least a quarterly basis or earlier if required by the manufacturer.

5-2.2 Hose shall be tested for leaks per manufacturer's requirements and any

leakage shall be a reason for rejection and replacement.

5-2.3 Testing shall be carried out with helium or with helium/ H₂blend as the test

gas or if this is not possible, with H₂using suitable precautions.

5-2.4 The facility operator shall maintain a maintenance log in good condition

and accessible to department inspection. Records shall be maintained for a

minimum of 2 years.

5-2.5 Controllers on fuel stations shall be designed to verify the integrity of the fuel

hose, breakaway, nozzle, and receptacle by pressurizing these components to at least

the vehicle backpressure and checking pressure drop prior to the start of fueling.

5-2.6 Containers and their appurtenances, piping systems,

compression

equipment, controls, and detection devices shall be maintained in operating condition

and according to manufacturer's instructions.

5-2.7 Pressure relief valves shall be maintained in operating condition.

5-2.8 Maintenance personnel shall be trained in leak detection procedures.

5-2.9 Area within 10 feet (3.1 meters) of dispenser shall be free from debris,

weeds and other material that present a fire hazard.

5-2.10 Safety, gas detection, and fire protection equipment shall be tested or

inspected at intervals not to exceed 6 months.

5-2.11 Maintenance activities on fire control equipment shall be scheduled so that a

minimum of equipment is taken out of service at any 1 time and fire prevention safety

is not compromised.

History: 2008 AACS.

R 29.7049 Clearance to combustibles.

Rule 49. Section 5-3 of the storage and handling of gaseous and Liquefied H₂code

is added as follows:

5-3 Clearance to combustibles. The area within 10 feet (3.1 meters) of any H₂

container shall be kept free of dry vegetation and combustible material.

History: 2008 AACS.

R 29.7050 Cathodic protection maintenance.

Rule 50. Sections 5-4 and 5-4.1 of the storage and handling of

Liquefied H₂code are added as follows:

gaseous and

5-4 Cathodic protection maintenance.

5-4.1(a) Owners and operators shall ensure that all metallic container systems

that are underground, mounded, or partially underground are protected and maintained to

minimize corrosion as cited in the NACE standard RP0169 entitled "Recommended

Practice, Control of External Corrosion of Underground or Submerged Metallic Piping

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Systems" and NACE recommended practice RP0285 entitled "Corrosion Control of

Underground Storage Tank Systems by Cathodic Protection."

(b) All corrosion protection systems shall be operated

and maintained to

continuously provide corrosion protection to the metal components of the portion

of the ASME approved container system that routinely contains H₂gas and that is

in contact with the ground.

(c) All container systems equipped with cathodic protection systems shall be

inspected for proper operation by a NACE certified cathodic protection tester as

defined in section 1-5. The H₂system shall be tested within 6 months of installation

and at least once each calendar year at intervals not to exceed 15 months.

(d) Container systems equipped with impressed current cathodic protection

systems shall be inspected by the owner every 60 days to ensure that the equipment is

operating within design specifications. The design limits shall be readily available.

(e) If container systems are equipped with cathodic protection, then the owner

or operator shall maintain records to demonstrate that the cathodic protection is in

compliance with the performance standards of this section.The records shall provide

both of the following:

(1) The results of the last 3 inspections required in subsection (d) of this section.

The results of testing from the last 2 inspections required in subsection (c) of this

section.

(f) Within 6 months following the repair of any cathodically protected

container system, where the repairs may affect the operation of the cathodic protection

system, the system shall be tested in accordance with subsections (c) and (d) of this

section to ensure that it is operating properly.

(g) Repairs or replacement of a cathodic protection system shall be conducted

by a NACE certified corrosion expert as defined in section 1-5.General system

maintenance of the cathodic protection system including, but not limited to,

replacement of fuses, and splicing of cable would not be required to be designed by a

corrosion expert and shall be approved by the department to not increase the hazard to

public health, safety, and welfare and the environment.

History: 2008 AACS.

R 29.7051 Stray or impressed currents and bonding.

Rule 51. Sections 5-5 to 5-5.3 of the storage and handling of

Liquefied H₂code are added as follows:

gaseous and

5-5 Stray or impressed currents and bonding.

5-5.1 Where stray or impressed currents are used or can be present on dispensing

systems, such as cathodic protection, protective measures to prevent ignition shall be

taken.

5-5.2 Static protection between the fuel dispenser and the vehicle shall not be

required where H₂is transferred by conductive hose, flexible metallic tubing, or pipe

connections where both halves of the metallic couplings are in continuous contact.

5-5.3 The transfer surface shall be concrete or shall have a resistivity not exceeding

API-RP 2003, "protection against ignitions arising out of static, lightning, and stray

currents," adopted by reference in section 8-1, performance criteria of 1 megohm as

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measured using a method acceptable to the department, such as EN 1081 1998 "Resilient

Floor Coverings - Determination of the Electrical Resistance.", adopted by reference in

section 8-1.

History: 2008 AACS.

R 29.7052 Emergency plan.

Rule 52. Sections 5-6 to 5-6.2 of the storage and handling of

Liquefied H₂code are added as follows:

gaseous and

5-6 Emergency plan.

5-6.1 An emergency plan shall be prepared and updated wherever gaseous or

liquefied H₂are produced, handled, stored, or used.

5-6.2 The plan shall be available to the department for inspection upon reasonable

notice and shall include the following information:

(a) The type of emergency equipment available and its location.

(b) A brief description of any testing or maintenance programs

available emergency equipment.

for the

(c) An indication that hazard identification labeling is provided for each storage

area.

(d) Location of posted emergency procedures.

(e) A material safety data sheet (MSDS or equivalent) that is available for the

gaseous or liquefied H₂stored or used on the site.

(f) A list of personnel or site operating authority who are designated and trained

to be liaison personnel for the fire department and who are responsible for, but shall

not be limited to, the following:

(1) Aiding the emergency responders in pre-emergency planning.

(2) Identifying the location of the gaseous and liquefied H₂stored or used.

(3) Accessing material safety data sheets.

(4) Knowledge of the site emergency procedures.

(g) A list of types and quantities of gaseous and liquefied H₂found within the

facility.

History: 2008 AACS.

R 29.7053 Release of H₂.

Rule 53. Sections 5-7 to 5-7.2 of the storage and handling of

Liquefied H₂code are added as follows:

5-7 Release of H₂.

gaseous and

5-7.1 Records of unexpected discharges. Accurate records of the unexpected

discharge of gaseous or liquefied H₂shall be kept by the facility and made readily

available upon request. The records shall be kept for a minimum of 2 years.

5-7.2 Container or PRD failure. When an unexpected discharge due to

container or PRD failure is discovered the department and the local fire department

shall be immediately notified, and the container shall be repaired or be removed from

service.

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History: 2008 AACS.

R 29.7054 Security.

Rule 54. Sections 5-8 and 5-8.1 of the storage and handling of

Liquefied H₂code are added as follows:

5-8 Security.

gaseous and

5-8.1 Compressed gas cylinders, containers, and systems shall be secured against

accidental dislodgement and against access by unauthorized personnel.

History: 2008 AACS.

R 29.7055 Leaks, damage, or corrosion.

Rule 55. Sections 5-9 and 5-9.1 of the storage and handling of

Liquefied H₂code are added as follows:

gaseous and

5-9 Leaks, damage, or corrosion.

5-9.1 Leaking, damaged, or corroded gaseous H₂systems shall be removed from

service, replaced, or repaired.

History: 2008 AACS.

Chapter 6 Fire Protection

R 29.7056 Fire protection; caution.

Rule 56. Section 6-1 is reproduced from NFPA 50A as follows:

6-1 Caution. Personnel shall be cautioned that hydrogen flames are practically

invisible.

History: 2008 AACS.

R 29.7057 Signage.

Rule 57. Sections 6-2 to 6-2.2 of the storage and handling of

Liquefied H₂code are added as follows:

gaseous and

6-2 Hazard identification signs shall be conspicuously placed at all locations

where H₂gas is produced, stored, used, or handled.

6-2.1 Ratings shall be assigned in accordance with NFPA 704, standard system for

the identification of the hazards of materials for emergency response.

6-2.2 The hazard classification of the metal hydride storage system shall be based on

the H₂stored without regard to the metal hydride content.

History: 2008 AACS.

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R 29.7058 Identification signs.

Rule 58. Sections 6-3 to 6-3.2 of the storage and handling of

Liquefied H₂code are added as follows:

gaseous and

6-3 Signs prohibiting smoking or open flames within 25 feet (7.6 meters) shall be

provided where H₂gas is produced, stored, or used.

6-3.1 A sign with the following legends printed in red capital letters on a white

background shall be conspicuously posted:

"NONODORIZED FLAMMABLE GAS - NO SMOKING - NO OPEN FLAMES"

All lettering on signage shall be 3 inches (7.62 centimeters) or more.

Exception: This does not apply to motor vehicle dispensing per sections 7.2.16

and 4-3.8.1.

6-3.2 Identification signs. Visible hazard identification signs shall be provided in

accordance with NFPA 704, "Standard System for the Identification of the Hazards of

Materials for Emergency Response," adopted by reference in section 8-1, at entrances to

buildings or areas in which liquefied H₂is stored, handled, or used.

History: 2008 AACS.

R 29.7059 Fire protection.

Rule 59. Section 6-4 of the storage and handling of gaseous and Liquefied H₂code

is added as follows:

6-4 A portable fire extinguisher having a rating of not less than 40-B:C, or 2 20-B:C,

shall be located within 75 feet (22.9 meters) from the pumps, dispensers, and

container fill openings. Fire extinguishers shall be inspected and maintained

according to NFPA 10, "standard for portable fire extinguishers," adopted by reference

in section 8-1.1.

History: 2008 AACS.

R 29.7060 Sprinkler protection.

Rule 60. Section 6-5 of the storage and handling of gaseous and Liquefied H₂code

is added as follows:

6-5 When sprinkler protection is provided, the area in which H₂is stored or used

shall be protected with an automatic sprinkler system designed to be not less than that

required by NFPA 13, "standard for the installation of sprinkler systems," adopted

by reference in section 8-1.

History: 2008 AACS.

Chapter 7 Gaseous hydrogen compression, gas processing, storage, and

dispensing systems

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R 29.7061 System component qualifications.

Rule 61. Section 7-1 of the storage and handling of gaseous and Liquefied H₂code

is added as follows:

7-1 System component qualifications. System components shall comply with the

appropriate provisions of chapters 2 and 3 of this part.

History: 2008 AACS.

R 29.7062 General system requirements.

Rule 62. Sections 7-2 to 7-2.18 of the storage and handling of

Liquefied H₂code are added as follows:

gaseous and

7-2 General system requirements.

7-2.1 All fuel dispensing facilities shall meet the provisions of this chapter.

7-2.2 Compression, processing, generation, storage, and dispensing equipment shall

be protected to prevent damage from vehicles and minimize the possibilities of

physical damage and vandalism and meet the requirements of section 2-1.5 and section

3-4.4.

7-2.2.1 Access to storage, compression, and gas processing equipment by

members of the public shall be restricted by a suitable secure area.

7-2.3 Control devices shall be installed so that internal or external icing does not

cause vehicle or fueling station malfunction.

7-2.4 Vehicles shall not be considered a source of ignition with respect to the

provisions of this chapter.

Exception: Vehicles containing fuel-fired equipment, such as recreational vehicles

and catering trucks, shall be considered a source of ignition unless this equipment is shut

off completely before entering an area in which ignition sources are not permitted.

7-2.5 The fueling connection shall prevent the escape of gas where the connector

is not properly engaged or becomes separated.

7-2.6 Fueling nozzles for H₂service shall be in accordance with section 2-12.1.

7-2.7 Compression and gas processing equipment shall be designed for use with H₂

and for maximum pressures and temperatures to which it can be subjected under normal

operating conditions.

7-2.8 Compression and gas processing equipment shall have pressure relief devices

that limit each stage pressure to the maximum allowable working pressure for the

compression cylinder and piping associated with that stage of compression and meets

the requirements of chapter 2.

7-2.9 H₂compression equipment shall be equipped with appropriate automatic

shutdown controls.

7-2.10 Control circuits that shut down shall remain down until manually activated

or reset by qualified personnel.

7-2.11 Engine-driven compressor installations shall conform where applicable to R

29.5101 et seq.

7-2.12 Gas processing equipment, including compression and generation

equipment, in processes where liquid is present, shall incorporate means to minimize

liquid carryover to the storage system.

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7-2.13 A hazard analysis shall be conducted on every H₂fueling system

installation by a qualified engineer with proven expertise in H₂fueling systems and

installations.

Exception: This does not apply to section 4-9.

7-2.13.1 The hazard analysis shall include the following: fire protection measures,

fire protection and suppression systems, detection systems, and ventilation.

7-2.13.2 At a minimum, the hazard analysis shall include consideration of potential

failures in hoses, nozzles, dispensing equipment, as well as failures for maintenance

and service.

7-2.13.3 Method used for hazard analysis shall be 1 or combination of several of the

following recognized procedures: hazard and operability studies (HAZOPs), failure

mode effects and criticality analysis (FMECA), preliminary hazards analysis (PHA),

fault tree analysis (FTA) and event tree analysis (ETA). Other analysis methods, when

used, shall ensure same level of system safety as provided by any of the recognized

procedures and be acceptable to the department based on the best interest of the public

health, safety, and welfare and the environment.

7-2.13.4 Standard designs that have been analyzed by recognized procedures need

not be studied each and every time such installation occurs. Site-specific elements

that are unique to the installation shall be reviewed in concert with the analysis

performed on the standard system to ensure that the standard design has not been altered

in a way that would negatively affect the hazard analysis.

7-2.13.5 These hazard analyses shall be available for review at final inspection,

prior to the installation being placed into service, shall be maintained on site, and be

available to the department upon request.

7-2.14 Dispensing systems shall be equipped to stop fuel flow automatically when a

fuel supply container reaches the temperature-corrected fill pressure.

7-2.15 Dispensing systems shall be equipped with an overpressure protection device

set at 140 percent of the service pressure of the fueling nozzle it supplies.

7-2.16 Warning signs shall be conspicuously posted in the dispensing area and shall

incorporate the following or equivalent wording: "Stop Motor, No Smoking, Non-

Odorized Flammable Gas. No Filling Of Portable Containers In Or On A Motor

Vehicle."

7-2.17 Each H₂-dispensing device shall be located not less than 10 feet (3.1

meters) from property lines, openings to buildings, and buildings of combustible

wall construction. A dispensing device shall not be less than 20 feet (6.1 meters) from

any activity that involves a fixed source of ignition. In addition, a dispenser shall not be

placed beneath a power line.

7-2.18 Each container filling location that is open to the public shall have an

attendant or supervisor on duty who meets the requirements of section 1-10.1 of the

rules.

History: 2008 AACS.

R 29.7063 Operating requirements for full-service H₂motor fuel dispensing

facilities.

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Rule 63. Sections 7-3 to 7-3.2 of the storage and handling of

Liquefied H₂code are added as follows:

gaseous and

7-3 Operating requirements for full-service H₂motor fuel dispensing facilities.

7-3.1 Each motor fuel dispensing facility shall have an attendant or supervisor

on duty whenever the facility is open for business. The attendant or supervisor shall

dispense H₂into fuel tanks of motor vehicles or into portable containers.

7-3.2 The provisions of section 2-1 of this part shall not prohibit the temporary

use of a portable storage container in conjunction with the dispensing of H₂into a

container or motor vehicle or motorized equipment which is on the premises and which

is not accessible to the public. A portable storage container installation shall only be

made with the approval of the department and comply with all the requirements of

section 2-13.

History: 2008 AACS.

R 29.7064

Operating requirements for attended self-service motor fuel

dispensing facilities.

Rule 64. Sections 7-4 to 7-4.5 of the storage and handling of

Liquefied H₂code are added as follows:

gaseous and

7-4 Operating requirements for attended self-service motor fuel dispensing

facilities.

7-4.1 Self-service motor fuel dispensing facility means that portion of a property

where H₂used as motor fuel is stored and dispensed from fixed, approved dispensing

equipment into the fuel containers of motor vehicles by persons other than the facility

attendant and shall also include, where provided, facilities for sale of other retail

products.

7-4.2 There shall be at least 1 attendant on duty while the self-service facility is

open for business. The attendant's primary function shall be to supervise, observe, and

control the dispensing of H₂while the H₂is actually being dispensed.

7-4.3 The responsibility of the attendant shall be as follows:

(a) Prevent the dispensing of H₂into portable containers in or

vehicle.

(b) Control sources of ignition.

(c) Immediately activate emergency controls and notify the fire department of any

on

a motor

fire.

The attendant or supervisor on duty shall be mentally and physically capable of

performing the functions and assuming the responsibility prescribed in section 7-4.3.

7-4.4 Operating instructions shall be conspicuously posted in the dispensing area.

7-4.5 The dispensing area shall at all times be in clear view of the attendant, and

the placing or allowing of any obstacle to come between the dispensing area and the

attendant control area is prohibited. This may be achieved by cameras, mirrors, or

both. The attendant shall at all times be able to communicate with persons in the

dispensing area.

History: 2008 AACS.

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R 29.7065 Operating requirements for unattended self-service motor fuel

dispensing facilities.

Rule 65. Sections 7-5 to 7-5.5 of the storage and handling of

Liquefied H₂code are added as follows:

gaseous and

7-5 Operating requirements for unattended self-service motor fuel dispensing

facilities.

7-5.1 Unattended self-service shall be permitted subject to the approval of the

department based on the best interests of public health, safety, and welfare and the

environment. Users shall use a key, card, or other method which is unique to each user,

and which is provided by the facility operator, and shall be properly trained in dispensing

operations. The owner shall verify such training to the department upon request.

7-5.2 At least 1 emergency shutoff device specified in section 7-6 shall be provided,

and shall be reset only by the owner or an owner's authorized agent.

7-5.3 Operating instructions shall be conspicuously posted in the dispensing area.

The instructions shall include the location of emergency controls.

7-5.4 In addition to the warning signs specified in section 6-3, emergency

instructions shall be conspicuously posted in the dispenser area. The instructions

shall incorporate the following or equivalent wording:"Emergency instructions In case of

fire:

(1) Use emergency stop button.

(2) Report accident by calling the local fire number. Report location."

7-5.5 A telephone or other approved, clearly identified means to notify the fire

department shall be provided on the site in

department.

a

location approved by the

History: 2008 AACS.

R 29.7066 Emergency shutoff devices.

Rule 66. Sections 7-6 to 7-6.1 of the storage and handling of

Liquefied H₂code are added as follows:

gaseous and

7-6 Emergency shutoff devices.

7-6.1 H₂dispensing systems shall be provided with 1 or more clearly identified

emergency shutoff devices or electrical disconnects at the dispensing area. Such

devices or disconnects shall be installed in approved locations but not less than 10 feet

(3.1 meters) and not more than 100 feet (30.5 meters) away from the dispensing area

and which is along the means of egress. Emergency shutoff devices or electrical

disconnects shall disconnect power and gas supply to all dispensing devices, to all remote

pumps serving

the dispensing devices, and to all associated power. When more than 1

emergency shutoff device or electrical disconnect is provided, all devices shall be

interconnected. Resetting from an emergency shutoff shall require manual intervention

and the manner of resetting shall be approved by the department.

History: 2008 AACS.

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R 29.7067 Refueling from transport vehicles.

Rule 67. Sections 7-7 to 7-7.11 of the storage and handling of

Liquefied H₂code are added as follows:

gaseous and

7-7 Refueling from transport vehicles. The dispensing of H₂in the open from a

transport vehicle to a motor vehicle located at commercial, industrial, governmental,

or manufacturing establishments and intended for fueling vehicles used in connection

with their businesses shall be permitted if all of the requirements of sections 7-7.1 to 7-

7.11 have been met.

7-7.1 The department shall be notified before commencing operations under

section 7-7.

7-7.2 The transport vehicle shall comply with U.S. DOT requirements for the

transportation of H₂.

7-7.3 Nighttime deliveries shall only be made in an area considered to be

adequately lighted.

7-7.4 The transport vehicle flasher lights shall be in operation while dispensing

operations are in progress.

7-7.5 Smoking materials, including matches, lighters, and other sources of ignition,

including torches, shall not be used within 20 feet (6.1 meters) of the dispensing of H₂in

the open from a transport vehicle to a motor vehicle.

7-7.6 Each area where dispensing of H₂in the open from a transport vehicle to a

motor vehicle shall be provided with 1 or more listed fire extinguishers that have a

minimum capability of 40-B:C. The fire extinguishers shall be readily accessible to the

dispensing operation. Fire extinguishers shall be inspected and maintained under

NFPA 10, "Standard for Portable Fire Extinguishers," adopted by reference in section

8-1.

7-7.7 Mobile fueling shall take place aboveground, shall not be beneath electric

power lines or where exposed by their failure, and shall be a minimum of 10 feet (3.1

meters) from the nearest important building, property line, or combustible storage.

7-7.8 Transport vehicle brakes shall be set and chock blocks shall be in place.

7-7.9 Persons performing dispensing operations shall be qualified to deliver and

dispense H₂fuels. Operations of transport vehicles used for mobile fueling operations

shall have access on-site or be in possession of an emergency communications

device to notify the proper authorities if there is an emergency.

7-7.10 The transport vehicles shall be positioned with respect to vehicles being

fueled to prevent traffic from driving over the delivery hose and between the transport

vehicle and motor vehicle being fueled. The dispensing hose shall be properly placed

on an approved reel or in an approved compartment before moving the transport

vehicle.

7-7.11 Additional requirements. The transfer area must meet the requirements of

section 5-5.

History: 2008 AACS.

Chapter 8 Referenced publications

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R 29.7068 Referenced publications.

Rule 68. Sections 8-1 to 8-1.2.10 of the storage and handling of gaseous and

Liquefied H₂code are added as follows:

8-1 The following documents or portions thereof are referenced within this standard

as mandatory requirements and shall be considered part of the requirements of this

standard. The edition indicated for each referenced mandatory document is the current

edition, and cost as of the date of issuance of these rules. Copies of the adopted

publications are available for inspection at the office of the Department of

Environmental Quality, Waste and Hazardous Materials Division, Storage Tank Unit,

P.O. Box 30241, Lansing, Michigan 48909-7741.

8-1.1 NFPA

Batterymarch Park, P.O. Box 9101, Quincy, Massachusetts 02269-9101.

NFPA 10, "Standard for Portable Fire Extinguishers," 2002 edition, $36.50.

publications.

National

Fire

Protection

Association.

1

NFPA 13, "Standard for the Installation of Sprinkler Systems," 2002 edition, $70.00.

NFPA 51, "Standard for the Design and Installation of Oxygen-Fuel Gas Systems for

Welding, Cutting, and Allied Processes," 2002 edition, $28.00.

NFPA 52, "Vehicle Fuel Systems Code," 2006 edition, $36.00.

NFPA 55, "Standard for the Storage, Use, and Handling of Compressed Gases and

Cryogenic Fluids in Portable and Stationary Containers, Cylinders, and Tanks,"

2005 edition, $36.50.

NFPA 69, "Standard on Explosion Prevention Systems," 2002 edition, $33.50.

NFPA 70, "National Electrical Code," 2005 edition, $75.00.

NFPA 101, "Life Safety Code," 2006 edition, $75.00.

NFPA 220, "Standard on Types of Building Construction," 1999 edition, $28.00.

NFPA 496, "Standard for Purged and Pressurized Enclosures for Electrical

Equipment," 2003 edition, $33.50.

NFPA 704, "Standard System for the Identification of the Hazards of Materials for

Emergency Response," 2001 edition, $33.50.

8-1.2 Other publications.

8-1.2.1 ASME publications. American Society of Mechanical Engineers, Three

Park Avenue, New York, New York 10016-5990.

ANSI/ASME B31.3, "Process Piping," 2002 edition, $240.00.

ASME International, "Boiler and Pressure Vessel Code, Section VIII," 2004

edition, $525.00.

8-1.2.2 ASTM publication. American Society for Testing and Materials, 100 Barr

Harbor Drive, West Conshohocken, Pennsylvania 19428-2959.

ASTM E136-04, "Standard Test Method for Behavior of Materials in a Vertical

Tube Furnace at 750 Degrees C," 2004 edition, $35.00.

8-1.2.3 CGA publications. Compressed Gas Association, 1725 Jefferson Davis

Highway, Arlington Virginia 22202-4100.

CGA S-1.1, "Pressure Relief Device Standards - Part 1 - Cylinders for

Compressed Gases," 2002 edition, $196.00.

CGA S-1.2, "Pressure Relief Device Standards - Part 2 - Cargo and Portable Tanks

for Compressed Gases," 1995 edition, $145.00.

CGA S-1.3, "Pressure Relief Device Standards - Part 3 - Stationary Storage

Containers for Compressed Gases," 2003 edition, $145.00.

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ANSI/CGA C-4, "Method of Marking Portable Compressed Gas Containers to

Identify the Material Contained," 2003 edition, $252.00.

CGA C-7, "Guide to the Preparation of Precautionary Labeling and Marking of

Compressed Gas Containers," 2000 edition, $268.00.

CGA G-5.5, "Hydrogen Vent Systems," 2004 edition, $39.00.

8-1.2.4 IAS publications. International Approval Services, 8501 East Pleasant

Valley Road, Cleveland, Ohio 44131.

ANSI/IAS NGV 4.4, "Breakaway Devices for Dispensing Systems," 1999 edition,

$57.00.

8-1.2.5 NACE publications. National Association of Corrosion Engineers

International, 1440 South Creek Drive, Houston, Texas 77084.

NACE RP0169, "Control of External Corrosion of Underground or Submerged

Metallic Piping Systems," 2002 edition, $42.00.

NACE RP0285, "Corrosion Control of Underground Storage Tank Systems by

Cathodic Protection," 2002 edition, $37.00.

8-1.2.6 SAE publications. Society of Automotive Engineers, 400 Commonwealth

Drive, Warrendale, Pennsylvania 15096.

SAE J2600, "Compressed Hydrogen Surface Vehicle Fueling Connection Devices,"

2002 edition, $59.00.

8-1.2.7 International codes council. 4051 West Flossmore Road, Country Club Hills,

Illinois 60478-5795.

"International Fire Code," 2006 edition, section 2209.3.2.6, $61.50.

8-1.2.8 U.S. Government publications. U.S. Government Printing Office,

Washington, DC 20402.

Title 49, Code of Federal Regulations, "Transportation," Parts 171-190, U.S.

Department of Transportation "Specifications and Regulations."

8-1.2.9

ECS

publications.

European

Committee

for

Standardization,

Central Secretariat: rue de Stassart 36, B-1050, Brussels.

EN 1081, "Resilient Floor Coverings, Determination of the

Resistance," 1998 edition, $32.00.

Electrical

8-1.2.10 API publications. American Petroleum Institute, 1220

Northwest, Washington, DC, 20005-5-4070.

L

Street,

API Recommended Practice 2003, "Protection Against Ignitions Arising Out of

Static, Lightning, and Stray Currents," 7th edition, $111.00.

History: 2008 AACS.

PART 3. STORAGE AND HANDLING OF LIQUEFIED HYDROGEN NFPA

50B

Chapter 1 General information

R 29.7070 Scope.

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Rule 70. Sections 1-1 to 1-1.3 of the storage and handling of

Liquefied H₂code are added as follows:

1-1 Scope.

gaseous and

1-1.1 Application. This standard covers the requirements for the design, siting,

construction, installation, spill containment, operation, maintenance, and

dispensing from a liquefied H₂system.

1-1.2 Nothing in this H₂code shall be intended to prevent the use of systems,

methods, or devices of equivalent or superior quality, strength, fire resistance,

effectiveness, durability, environmental protection capability, or safety over those

prescribed by this H₂code, if technical documentation is submitted to the department

to demonstrate equivalency and the system, method, or device is approved for the

intended purpose.

1-1.3 This code shall apply to the design and installation of liquefied H₂dispensing

systems.

Exception: Dispensing into rail and aircraft.

History: 2008 AACS.

R 29.7071 Retroactivity.

Rule 71. Sections 1-2 and 1-2.1of the storage and handling of

Liquefied H₂code are added as follows:

1-2 Retroactivity.

gaseous and

1-2.1 The provisions of this H₂code are necessary to provide a reasonable level of

protection from loss of life and property from fire and explosion. The provisions shall

reflect situations and the state of the art prevalent when the H₂code was issued.

Unless otherwise noted, it shall not be intended that the provisions of this H₂code

be applied to facilities, equipment, structures, or installations that were existing or

approved for construction or installation before the effective date of this H₂code,

except in those cases where it is determined by the department that the existing

situation involves a distinct hazard to public health, safety, and welfare, and the

environment.

History: 2008 AACS.

R 29.7072 Definitions.

Rule 72. Section 1-3 of the storage and handling of gaseous and Liquefied H₂code

is added and section 1-3.1 is reproduced from NFPA 50B as follows:

1-3 Definitions.

(a) "ANSI" means the american national standards institute.

(b) "Approved" means acceptable to the department.

(c) "ASME" means the american society of mechanical engineers.

(d) "Authority having jurisdiction" means the department.

(e) "Automatic emergency shutoff valve" means

automatic closing valve designed to shut off the flow of

a

designated fail-safe

gases or liquids that is

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initiated by a control system where the control system is activated by either manual or

automatic means.

(f) "Bulk storage" means a single container or containers, where all containers

draw down at the same time.

(g) "Cargo transport container" means a mobile unit designed to transport

gaseous or liquefied H₂.

(h) "Cascade storage system" means storage in containers or cylinders

arranged in banks where each bank acts as 1 large container. The banks are separated

by switching valves to provide sequential drawdown of the banks.The bank may

consist of 1 or more containers or cylinders.

(i) "Cathodic protection" means a technique to prevent the corrosion of a metal

surface by making the surface the cathode of an electrochemical cell.This protection

renders a metallic container or piping component negatively charged with respect to its

environment. This protection shall be designed by a corrosion expert as defined by

these rules.

(j) "Cathodic protection tester" means a person who can demonstrate an

understanding of the principles and measurements of all common types of cathodic

protection systems applicable to metal piping and container systems and who has

education and experience in soil resistivity, stray current, structure-to-soil potential,

and component electrical isolation measurements of metal piping and container

systems. The person shall be certified as being qualified by the national association

of corrosion engineers (NACE) international.

(k) "Composite container" means a container fabricated of 2 or more materials

that interact to facilitate the container design criteria.

(l) "Compression discharge pressure" means the varying pressure at the point of

discharge from the compressor.

(m) "CGA" means the compressed gas association.

(n) "Container" means a pressure vessel or cylinder used to store H₂.

(o) "Container appurtenances" means devices connected to container openings

for safety, control, or operating purposes.

(p) "Container system" means a container or combination of containers and all

attached appurtenances, valves, and piping.

(q) "Container valve" means a valve connected directly to the container

outlet.

(r) "Continuous gas detection system" means a gas detection system in which the

instrument is maintained in continuous operation.

(s) "Corrosion expert" means a person who, by reason of thorough knowledge of

the physical sciences and the principals of

engineering

and mathematics

acquired by a professional education and related practical experience, is qualified to

engage in the practice of corrosion control of container systems. The person

shall be certificated as being qualified by NACE, as a senior corrosion technologist,

a

cathodic protection specialist, or a corrosion specialist or be a registered

engineer who has certification and licensing that includes education and experience in

corrosion control.

(t) "Corrosion protection" means protecting a container system to prevent the

degradation of the metal through oxidation or reactivity with its environment.

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(u) "Cryogenic fluid" means a fluid with a boiling point

lower

than -130

degrees Fahrenheit (-90 degrees Celsius) at an absolute pressure of 101.325 kPa (14.7

psia).

(v) "Cylinder" means a container constructed in accordance with the United

States Department of Transportation specifications, Title 49, code of federal regulations

(CFR), parts 171-190.

(w) "Department" means the department of environmental quality.

(x) "Director" means the director of the department of environmental quality.

(y) "Dispensing station" means an H₂installation that

dispenses

H₂from

storage containers into fuel supply containers or into portable cylinders by means of

a compressor, reformer, vaporizer, or pressure booster.

(z) "Emergency shutdown device (ESD)" means a device that closes all fueling

operations within the fueling facility from either local or remote locations.

(aa) "Excess flow control" means to limit or stop the flow of H₂gas from a source

of supply, when there is a rupture, break, or 'open valve to atmosphere' condition

that may present a hazard to personnel or the environment.

(bb) "Fail-safe" means a design feature that provides for the maintenance of safe