(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  
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  
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  
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.  
Page 1  
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  
H2 code 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  
H2 content of less than 400 scf (11 m3). Where individual systems, each having a total  
H2 content 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.  
Page 2  
1-3.4 When required by the department, H2 introduced 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 H2 in 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 H2 code are added as follows:  
1-4 Retroactivity.  
gaseous and  
1-4.1 The provisions of this H2 code 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 H2 code was issued. Unless  
otherwise noted, it is not intended that the provisions of this H2 code be applied to  
facilities, equipment, structures, or installations that were existing or approved for  
construction or installation before the effective date of this H2 code, 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 H2 code  
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  
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  
Page 3  
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  
(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  
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  
(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 H2 installation that  
H2 from  
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.  
Page 4  
(z) "Excess flow control" means to limit or stop the flow of H2 gas 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  
(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 H2 leak at specified concentrations and activating alarms and safety  
(ii) "Gaseous H2 system" means a system in which the H2 is delivered, stored,  
and discharged in the gaseous form including the piping system. The gaseous H2 system  
terminates at the point where the H2 is dispensed.  
(jj) "Hydrogen (H2)" means the simplest and lightest element in the known  
universe, which exists as a gas except at low cryogenic temperatures.H2 gas is a colorless,  
odorless and highly flammable gas when mixed with oxygen over a wide range of  
concentrations. H2 forms 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  
H2 rules 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 H2 gas as an engine fuel.  
Page 5  
(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  
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  
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  
(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 H2 gas  
absorbed in solid material.  
(ww) "Motor fuel dispensing facility" means that portion of the property  
where H2 is 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  
(yy) "Original equipment manufacturer (OEM)" means  
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,  
Page 6  
but substantially empty of product, are "portable storage containers" and are defined  
(ccc) "Portable storage container" means a container  
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  
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  
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  
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 H2 into vehicles at a residence which  
includes its associated equipment and piping.  
(nnn) "Service pressure" means the nominal gas pressure at  
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 H2 when 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 H2 gas into vehicles including associated equipment  
Page 7  
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).  
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  
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 H2 system.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.  
Page 8  
R 29.7015 Equivalency.  
Rule 15. Sections 1-6 to 1-6.3 of the storage and handling of  
Liquefied H2 code are added as follows:  
1-6 Equivalency.  
gaseous and  
1-6.1 Nothing in this H2 code 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 H2 code, if technical documentation is submitted to the department  
to demonstrate equivalency and the system, method, or device is approved for the  
intended purpose.  
1-6.2 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  
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 H2 code are added as follows:  
1-7 Prohibitions.  
1-7.1 Any H2 storage 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 H2 to 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 H2 system.  
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 H2 code are added as follows:  
gaseous and  
1-8 Installation application.  
Page 9  
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 H2 storage 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  
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  
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.  
Page 10  
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  
H2 code are added as follows:  
1-9 Installation application fees and annual certification.  
1-9.1 Only an owner of an H2 container system for which an installation  
application is required to be submitted under section 1-8 of the H2 code 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 H2 or 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 H2 code are added as follows:  
1-10 Personnel.  
gaseous and  
1-10.1 In the interest of safety, all persons involved in handling H2 shall 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 H2 into 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  
H2 code are added as follows:  
2-1 Containers.  
2-1.1 H2 containers 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-  
(b) Designed, constructed, tested, and maintained in accordance with Title 49,  
(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  
(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.  
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  
2-1.4 An owner or operator that has  
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.  
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  
H2 shall be in accordance with this subsection.  
2-1.8.1 Construction. Storage containers for gaseous H2 shall 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-  
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