DEPARTMENT OF LICENSING AND REGULATORY AFFAIRS  
DIRECTOR'S OFFICE  
CONSTRUCTION SAFETY STANDARDS  
(By authority conferred on the director of the department of licensing and regulatory  
affairs by sections 19 and 21 of 1974 PA 154, MCL 408.1019 and 408.1021, and  
Executive Reorganization Order Nos. 1996-2, 2003-1, 2008-4, and 2011-4, MCL  
445.2001, 445.2011, 445.2025, and 445.2030)  
PART 18. FIRE PROTECTION AND PREVENTION  
R 408.41801 Scope.  
Rule 1801. This part pertains to all of the following:  
(a) Fire prevention plans.  
(b) Employee emergency plans.  
(c) Fire fighting equipment.  
(d) The storing and dispensing of flammable and combustible materials.  
(e) Heating devices for construction operations.  
History: 1979 AC; 1983 AACS; 1995 AACS; 2002 AACS.  
R 408.41802 Adopted and referenced standards.  
Rule 1802. (1) The following standards are adopted by reference in these rules and  
are available from The National Fire Protection Association, (NFPA) 1 Batterymarch  
Park, Quincy, Massachusetts, 02169-7471, USA; telephone number: 617-770-3000; or  
rules as stated in this subrule.  
(a) NFPA 13 “Installation Of Sprinkler System” 1991 edition. Cost $27.00.  
(b) NFPA 14 “Standard For The Installation Of Standpipe, Private Hydrants And  
Hose Systems”, 2000 edition. Cost $39.00.  
(c) NFPA 25 “Inspection, Testing, And Maintenance Of Water-Based Fire  
Protection Systems”, 1998 edition. Cost $50.50.  
(d) NFPA 251 “Standard Methods Of Fire Testing Of Building Construction And  
Materials,” 1990 edition. Cost $27.00.  
(e) NFPA 30 “Flammable And Combustible Liquids Code,” 1996 edition. Cost  
$27.00.  
(f) NFPA 385 “Standard For Tank Vehicles For Flammable And Combustible  
Liquids,” 1990 edition. Cost $27.00.  
(g) NFPA 10A “Maintenance and Use of Portable Fire Extinguishers,” 1970 edition.  
Cost $29.00.  
(h) NFPA 80 “Standard for Fire Doors and Windows,” 1970 edition. Cost $29.00.  
Page 1  
(2) The following standards are adopted by reference in these rules and are available  
from IHS Global, 15 Inverness Way East, Englewood, Colorado, 80112, USA, telephone  
of the time of adoption of these rules, as stated in this subrule.  
(a) Compressed Gas Association (CGA) Standard CGA C7 “Guide To The  
Preparation Of Precautionary Labeling And Marking Of Compressed Gas Containers,”  
2000 edition. Cost $892.00.  
(b) American Society for Testing and Materials (ASTM) Standard ASTM D56  
“Standard Test Method for Flash Point by Tag Closed Cup Tester,” 1969 edition. Cost:  
$58.00.  
(c) ASTM D93 “Standard Test Methods for Flash Point by Pensky-Martens Closed  
Cup Tester,” 1969 edition. Cost $67.00.  
(3) The provisions of the Department of Transportation Title 49 C.F.R. Part 178,  
“Shipping Container Specifications,” is adopted by reference in these rules and is  
adoption of these rules.  
(4) The standards adopted in these rules are available for inspection at the  
Department of Licensing and Regulatory Affairs, MIOSHA Regulatory Services Section,  
7150 Harris Drive, Lansing, Michigan, 48909-8143.  
(5) Copies of the standards adopted in these rules may be obtained from the  
publisher or may be obtained from the Department of Licensing and Regulatory Affairs,  
MIOSHA Regulatory Services Section, 7150 Harris Drive, Lansing, Michigan, 48909-  
8143, at the cost charged in this rule, plus $20.00 for shipping and handling.  
(6) The following Michigan occupational safety and health standards (MIOSHA) are  
referenced in these rules. Up to 5 copies of this standard may be obtained at no charge  
from the Michigan Department of Licensing and Regulatory Affairs, MIOSHA  
Regulatory Services Section, 7150 Harris Drive, P.O. Box 30643, Lansing, Michigan,  
quantities greater than 5, the cost, at the time of adoption of these rules, is 4 cents per  
page.  
(a) Construction Safety Standard Part 22 'Signals, Signs, Tags and Barricades,' R  
480.42201 to R 408.42242.  
(b) Construction Safety Standard Part 42 “Hazard Communication,” R 408.44201 to  
R 408.44203.  
History: 2002 AACS; 2013 AACS; 2015 AACS.  
R 408.41836 Definitions; A to C.  
Rule 1836. (1) "Approved" means equipment that has been listed or approved by a  
nationally recognized testing laboratory, such as Factory Mutual Engineering  
Corporation, or Underwriters’ Laboratories, Inc., or federal agencies such as Bureau of  
Mines, or U.S. Coast Guard, which issue approvals for the equipment.  
(2) "Closed container" means a container that is sealed by means of a lid or other  
device so that neither liquid nor vapor will escape from it at ordinary temperatures.  
(3) “Combustion” means any chemical process that involves oxidation sufficient to  
produce light or heat.  
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(4) "Container" means all vessels, such as tanks, cylinders, or drums, used for  
transportation or storing liquefied petroleum gases.  
(5) "Container in use" means a container connected for use.  
History: 1979 AC; 1983 AACS; 2002 AACS; 2015 AACS.  
R 408.41837 Definitions; F.  
Rule 1837. (1) "Fire alarm signaling system" means an alerting signal that is clearly  
audible throughout all areas and which would immediately alert employees in case of an  
emergency.  
(2) “Fire brigade” means an organized group of employees that are knowledgeable,  
trained, and skilled in the safe evacuation of employees during emergency situations and  
in assisting in fire fighting operations.  
(3) "Fire fighting equipment" means any of the following:  
(a) Portable extinguishers.  
(b) Fixed fire equipment.  
(c) Water barrels and pails.  
(d) Standpipes.  
(e) Fire hose.  
(f) Fire alarms.  
(4) "Fire protection" means to provide fire fighting equipment, training, and  
evacuation plans.  
(5) "Fire resistance" means that quality of a material that renders it so resistant to  
fire that, for a specified time and under conditions of a standard heat intensity, the  
material will not fail structurally and will not permit the side away from the fire to  
become hotter than a specified temperature. For purposes of this part, fire resistance shall  
be determined by the fire test of building construction and materials, as prescribed in The  
National Fire Protection Association Standard NFPA 251, "Standard Methods Of Fire  
Testing Of Building Construction And Materials," 1990 edition, which is adopted by  
reference in R 408.41802.  
(6) "Fixed fire equipment" means a fire extinguishing system that is permanently  
mounted and portable portions of a system, such as a hose and nozzle attached to a fixed  
supply of extinguishing agent.  
(7) "Flammable" means to ignite easily and burn intensely or means to have a rapid  
rate of flame spread.  
(8) "Flammable liquid" means any liquid having a vapor pressure not exceeding 40  
pounds per square inch (absolute) at 100 ºF (37.8 ºC) and having a flashpoint at or below  
199.4 ºF (93 ºC). Flammable liquids are divided into the following categories:  
(a) Category 1 shall include liquids having flashpoints below 73.4 ºF (23 ºC) and  
having a boiling point at or below 95 ºF (35 ºC).  
(b) Category 2 shall include liquids having flashpoints below 73.4 ºF (23 ºC) and  
having a boiling point above 95 ºF (35 ºC).  
(c) Category 3 shall include liquids having flashpoints at or above 73.4 ºF (23 ºC)  
and at or below 140 ºF (60 ºC).  
(d) Category 4 shall include liquids having flashpoints above 140 ºF (60 ºC) and at  
or below 199.4 ºF (93 ºC).  
Page 3  
(9) "Flash point of the liquid” means the temperature at which it gives off vapor  
sufficient to form an ignitable mixture with the air near the surface of the liquid within  
the vessel used as determined by appropriate test procedure and apparatus as follows:  
(a) The flashpoint of liquids having a viscosity less than 45 Saybolt Universal  
Second(s) at 100 ºF (37.8 ºC) and a flashpoint below 175 ºF (79.4 ºC) shall be determined  
in accordance with ASTM D56 “Standard Test Method for Flash Point by Tag Closed  
Cup Tester,” 1969 edition, as adopted by reference in R 408.41802, or an equivalent  
method as defined in Construction Safety Standard Part 42 “Hazard Communication,”  
Appendix B, as referenced in R 408.41802.  
(b) The flashpoints of liquids having a viscosity of 45 Saybolt Universal Second(s)  
or more at 175 ºF (79.4 ºC) or higher shall be determined in accordance with ASTM D93  
“Standard Test Methods for Flash Point by Pensky-Martens Closed Cup Tester,” 1969  
edition, as adopted by reference in R 408.41802, or an equivalent method as defined in  
Construction Safety Standard Part 42 “Hazard Communication,” Appendix B, as  
referenced in R 408.41802.  
History: 1979 AC; 1983 AACS; 1995 AACS; 2002 AACS; 2015 AACS.  
R 408.41838 Definitions; L to V.  
Rule 1838. (1) "Liquefied petroleum gas," "L.P.G.," or "L.P. gas" means any  
material that is composed predominately of any of the following hydrocarbons or  
mixtures of hydrocarbons:  
(a) Propane.  
(b) Propylene.  
(c) Butane.  
(d) Isobutene.  
(e) Butylene.  
(2) "Means of egress" means a continuous path of travel from any part within a  
building to the open air outside at ground level.  
(3) "Portable tank” means a closed container that has a liquid capacity of more than  
60 United States gallons, which is not intended for fixed installation.  
(4) "Safety can" means an approved metal or nonmetallic closed container that has a  
capacity of not more than 5 gallons, that has a flash-arresting screen, spring-closing lid  
and spout cover, and that is designed so that it will safely relieve internal pressure when  
exposed to fire.  
(5) "Temporary building" means a structure erected or placed for a period not longer  
than the project construction time.  
(6) "Temporary heating device" means a heating unit to provide heat for a period not  
longer than the project construction time.  
(7) "Vapor pressure" means the pressure, measured in pounds per square inch  
(absolute), exerted by a volatile liquid.  
History: 1979 AC; 1983 AACS; 2002 AACS; 2015 AACS.  
R 408.41841 Employer responsibility.  
Page 4  
Rule 1841. (1) An employer shall be responsible for the development of a fire  
protection program to be followed throughout all phases of the construction and  
demolition work, and the employer shall provide the firefighting equipment as specified  
in these rules. As fire hazards occur, there shall be no delay in providing the necessary  
equipment.  
(2) The fire protection portion of the program shall include all of the following:  
(a) Establishing and maintaining a means of egress from all areas of the building  
occupied by employees to provide free and unobstructed egress from all parts of the  
building or structure at all times when the building or structure is occupied. A lock or  
fastening that prevents free escape from the inside of any building shall not be installed,  
except in mental, penal, or corrective institutions where supervisory personnel is  
continually on duty and effective provisions are made to remove occupants in case of fire  
or other emergency.  
(b) Posting fire rules or, by other means, informing the employees of the evacuation  
signal, escape routes, and emergency phone numbers. Exits shall be marked by a readily  
visible sign. Access to exits shall be marked by readily visible signs in all cases where the  
exit or way to reach the exit is not immediately visible to the occupants.  
(c) A requirement that means of egress shall be continually maintained free of all  
obstructions or impediments to full instant use in the case of fire or other emergency.  
(3) The fire prevention portion of the program shall include both of the following:  
(a) A housekeeping policy designed to keep a means of egress free from the  
accumulation of stored materials and debris and to reduce the likelihood of fire.  
(b) A policy for the storage of combustible and flammable liquids and materials and  
for the use of proper heating equipment as prescribed in this part.  
(4) The employer shall provide fire fighting equipment and meet all of the  
applicable requirements of this part as to location, accessibility, inspection, testing, and  
maintenance. The employer shall immediately replace defective equipment.  
(5) As warranted by the project, the employer shall provide a trained and equipped  
firefighting organization, Fire Brigade, to assure adequate protection to life.  
(6) Fire walls and exit stairways, required for the completed buildings, shall be  
given construction priority. Fire doors, with automatic closing devices, shall be hung on  
openings as soon as practicable.  
(7) Fire cutoffs shall be retained in buildings undergoing alterations or demolition  
until operations necessitate their removal.  
History: 1979 AC; 1983 AACS; 1995 AACS; 2002 AACS; 2013 AACS; 2015 AACS.  
R 408.41842 Rescinded.  
History: 1995 AACS; 2002 AACS; 2013 AACS.  
R 408.41850 Rescinded.  
History: 1995 AACS; 2013 AACS.  
Page 5  
FIRE PROTECTION  
R 408.41851 Portable fire extinguishing equipment; selection and installation.  
Rule 1851. (1) All portable fire extinguishers shall bear an approved label of a  
nationally recognized testing laboratory.  
A fire extinguisher or extinguishing device that contains an active agent or propellant  
that has thermal decomposition products that have a level of vapor toxicity equal to or  
greater than any of the following listed materials shall not be used, installed for use, or  
allowed to remain installed for use:  
(a) Carbon tetrachloride, CCL4.  
(b) Chlorobromomethane, CH2 BrCL.  
(c) Azeotropic chlormethane, CM7.  
(d) Dibromodifluoromethane, CBr2F2.  
(e) 1, 2-dibromo-2-chloro-1, 1, 2-trifluoroethane, Cbr-F2, CBrCLf.  
(f) 1, 2-dibromo-2, 2-difluoroethane, CH2BrCbrF2.  
(g) Methylbromide, CH3Br.  
(h) Ethylene dibromide, CH2BrCH2Br.  
(i) Hydrogen bromide, HBr.  
(j) Methylene bromide, CH2Br2.  
(k) Bromodifluoromethane, CHBrF2.  
(2) A fire extinguisher, rated not less than 2A, shall be provided for each 3,000  
square feet of the protected building area, or major fraction thereof. Travel distance from  
any point of the protected area to the nearest fire extinguisher shall not exceed 100 feet.  
(3) One or more fire extinguishers, rated not less than 2A, shall be provided on each  
floor. In multistory buildings, at least 1 fire extinguisher shall be located adjacent to  
stairway.  
(4) Fire fighting equipment shall be located where it will be readily seen and  
accessible along normal paths of travel in the protected area.  
(5) One 55-gallon open drum of water and 2 fire pails may be substituted for a fire  
extinguisher that has a 2A rating. Extinguishers and water drums, subject to freezing,  
shall be protected from freezing.  
(6) A 1/2 inch or larger interior diameter garden hose that is not more than 100 feet  
in length and that is equipped with a nozzle may be substituted for a 2A fire extinguisher  
if it is capable of reaching all points in the area that would be covered by the replaced  
extinguisher and is capable of discharging not less than 5 gallons per minute with a  
horizontal hose stream of not less than 30 feet. The hose line shall be mounted on a rack  
or reel. Not more than 1/2 of the total number of required fire extinguishers may be  
replaced by the hose.  
(7) In addition to the requirements of this rule, fire extinguishers shall be supplied as  
follows:  
(a) Not less than 1 portable fire extinguisher that has a rating of not less than 20 BC  
units shall be located as follows:  
(i) Outside of, but not more than 10 feet from, a door opening to a room used for the  
storage of more than 60 gallons of flammable liquids.  
(ii) Not less than 25 feet, nor more than 75 feet, from an outside storage area.  
Page 6  
(iii) On each tank truck or other vehicle used to transport or dispense flammable  
liquids.  
(iv) A fire extinguisher, rated not less than 10B, shall be provided within 50 feet of  
wherever more than 5 gallons of flammable or combustible liquids or 5 pounds of  
flammable gas are being used on the jobsite. This requirement does not apply to the  
integral fuel tanks of motor vehicles.  
(b) Each service or fueling area shall have at least 1 portable fire extinguisher which  
has not less than a 20 BC unit rating and which is located within 75 feet of each pump,  
dispenser, underground fill opening, and lubricating or service area.  
(c) Storage locations for liquefied petroleum gas (L.P.G.) shall be provided with at  
least 1 approved portable fire extinguisher that has a rating of not less than 20 BC.  
(d) Each site of a hazardous process shall be provided with a portable fire  
extinguisher of an appropriate size and type. Other means for safety or control may be  
provided if approved or required by the process.  
(8) Table 1 may be used in selecting and providing an extinguisher.  
(9) Table 1 reads as follows:  
TABLE 1  
DESCRIPTI  
Combustible  
EXTINGUISHER  
CONTENTS  
TYPE  
AND  
dry  
HAZARD  
Class  
ON  
Loaded  
stream,  
Multipurpose  
"A"  
"B"  
"C"  
"D"  
chemical, Pressure-operated water, Water  
pump tanks, Water mist, Halon 1211.  
Fire  
Material  
Flammable  
Liquids, Gas,  
Or Grease  
Carbon dioxide, Dry chemical, Foam,  
Class  
Fire  
Loaded  
chemical, Halon 1211.  
Carbon dioxide with plastic horn only,  
stream,  
Multipurpose  
dry  
Class  
Fire  
Electrical  
Equipment  
Dry chemical, Multipurpose dry chemical,  
Water mist, Halon 1211.  
Class  
Fire  
Combustible  
Metal  
Extinguishing agent listed for use on a  
specific combustible metal hazard.  
History: 1979 AC; 1983 AACS; 1995 AACS; 2002 AACS; 2015 AACS.  
R 408.41852 Portable fire extinguishers.  
Rule 1852. Portable fire extinguishers shall be inspected periodically and maintained  
in accordance with NFPA 10A “Maintenance and Use of Portable Fire Extinguishers,”  
1970 edition, as adopted by reference in R 408.41802.  
History: 1979 AC; 1983 AACS; 1995 AACS; 2002 AACS; 2013 AACS; 2015 AACS.  
Page 7  
R 408.41853 Fixed fire equipment.  
Rule 1853. (1) Sprinkler protection shall be as follows:  
(a) If the facility being constructed includes the installation of automatic sprinkler  
protection, the installation shall closely follow the construction and be placed in service  
as soon as applicable laws permit following completion of each story.  
(b) In all structures in which standpipes are required, or where standpipes exist in  
structures being altered, they shall be brought up as soon as applicable laws permit, and  
shall be maintained as construction progresses in such a manner that they are always  
ready for fire protection use. The standpipes shall be provided with Siamese fire  
department connections on the outside of the structure, at the street level, which shall be  
conspicuously marked.  
(2) During demolition or alterations, an existing sprinkler or standpipe system shall  
be maintained in service in any portion of a structure that is not subject to demolition or  
alteration. The operation of a sprinkler control valve shall be permitted only by a properly  
authorized person. Modification of a sprinkler system to permit alterations or additional  
demolition shall be expedited so that the automatic protection may be returned to service  
as quickly as possible. Sprinkler control valves shall be checked daily at the close of  
work to ascertain whether the protection is in service. When the sprinkler or standpipe  
system is out of service for other than routine maintenance, the local fire department and  
the building manager or designated representative shall be notified. A sign shall be posted  
on each fire department connection that is out of service and the balance of the service  
shall be tested and resealed in operable condition, where required, and both the fire  
department and the building manager or designated representative shall be advised that  
the system is again in service.  
(3) A standpipe and hose system shall have not less than 1 outlet per story.  
(4) An automatic sprinkler system shall be installed and maintained as prescribed in  
The National Fire Protection Association Standards NFPA 13 "Installation of Sprinkler  
Systems," 1991 edition; NFPA 14 "Standard For The Installation Of Standpipe, Private  
Hydrants And Hose Systems," 2000 edition; and NFPA 25 "Inspection, Testing, And  
Maintenance Of Water-Based Fire Protection Systems," 1998 edition. The standards are  
adopted by reference in R 408.41802.  
History: 1979 AC; 1983 AACS; 1995 AACS; 2002 AACS; 2015 AACS.  
R 408.41854 Water supply.  
Rule 1854. (1) An employer shall make available temporary or permanent water  
supply, of sufficient volume, duration, and pressure, required to properly operate the  
firefighting equipment as soon as combustible materials accumulate.  
(2) Where an underground water main is to provide water for fire protection  
equipment, the main shall be installed, completed, and made available for use as soon as  
practicable.  
History: 1979 AC; 1983 AACS; 2015 AACS.  
Page 8  
R 408.41855 Fire hose and connections.  
Rule 1855. (1) One-hundred feet or less of 1-1/2 inch hose, with a nozzle capable of  
discharging water at 25 gallons or more per minute supplied from an approved standpipe  
system may be substituted for a fire extinguisher rated not more than 2A in the  
designated area provided that the hose line can reach all points in the area.  
(2) The employer shall contact the local fire fighting organization to assure that fire  
hose connections on the jobsite are compatible with their fire fighting equipment. If a  
connection is not compatible, the employer shall install an adapter, or equivalent, to  
permit connection of local fire fighting equipment.  
(3) During demolition involving combustible materials, charged hose lines, supplied  
by hydrants, water tank trucks with pumps, or equivalent, shall be made available.  
History: 1979 AC; 1983 AACS; 2015 AACS.  
R 408.41856 Fire alarms.  
Rule 1856. An alarm system shall be established whereby all employees on the  
site can be alerted for an emergency. The signaling device shall be audible  
throughout the structure.  
History: 1979 AC; 1983 AACS.  
FIRE PREVENTION  
R 408.41861 Ignition hazards.  
Rule 1861. (1) Internal combustion engine powered equipment shall be so located  
that the exhaust piping is at a distance away from flammable and combustible materials  
to prevent ignition. When the exhaust is piped to outside the building under construction,  
a clearance of not less than 6 inches shall be maintained between the piping and  
flammable and combustible material.  
(2) Smoking shall be prohibited within 25 feet of flammable material. The area shall  
be posted with a sign "No Smoking or Open Flame." The sign shall be as prescribed in  
the Construction Safety Standard Part 22 “Signals, Signs, Tags and Barricades,” as  
referenced in R 408.41802.  
(3) Electrical wiring equipment and portable battery-powered lighting equipment  
used in connection with the storage, handling, or use of flammable material shall be of  
the type approved for the hazardous location.  
(4) The nozzle of an air, inert gas, and steam line or hose, when used in the cleaning  
or ventilation of tanks and vessels that contain flammable gases or vapors, shall be  
bonded to the tank or vessel shell.  
(5) When a hazardous concentration of flammable gas or vapor exists in the area  
outside of the tank or vessel, the external bonding connection shall be made to the tank or  
vessel with the non-sparking device. The final bonding connection shall be made outside  
the hazardous concentration.  
Page 9  
History: 1979 AC; 1983 AACS; 2002 AACS; 2015 AACS.  
R 408.41861a Location of containers.  
Rule 1861a. (1) Containers shall be in a suitable ventilated enclosure or otherwise  
protected against tampering.  
(2) The quantity of flammable liquids kept in the vicinity of spraying operations  
shall be the minimum required for operations and should ordinarily not exceed a supply  
for 1 day or 1 shift.  
(3) Bulk storage of portable containers of flammable liquids shall be in a separate,  
constructed building detached from other important buildings or cut off in a standard  
manner.  
(4) Containers shall be upright upon firm foundations or otherwise firmly secured.  
(5) The possible effect on the outlet piping of settling shall be guarded against by a  
flexible connection or special fitting.  
(6) LP-gas containers with a water capacity per container of more than 125 gallons  
shall be located a minimum of 10 feet from the nearest building or group of buildings  
when in use.  
History: 2015 AACS.  
R 408.41861b Temporary buildings.  
Rule 1861b. (1) A temporary building shall not be erected where it will adversely  
affect a means of egress.  
(2) Temporary buildings, when located within another building or structure, shall be  
of either noncombustible construction or of combustible construction having a fire  
resistance of not less than 1 hour.  
(3) Temporary buildings, located other than inside another building and not used for  
the storage, handling, or use of flammable or combustible liquids, flammable gases,  
explosives, or blasting agents, or similar hazardous occupancies, shall be located at a  
distance of not less than 10 feet from another building or structure.  
(4) Groups of temporary buildings not exceeding 2,000 square feet in aggregate,  
shall, for the purposes of these rules, be considered a single temporary building.  
History: 2015 AACS.  
R 408.41861c Open yard storage.  
Rule 1861c. (1) Combustible materials shall be piled with due regard to the stability  
of piles and in no case higher than 20 feet.  
(2) Driveways between and around combustible storage piles shall be at least 15 feet  
wide and maintained free from accumulation of rubbish, equipment, or other articles or  
materials.  
(3) Driveways shall be so spaced that a maximum grid system unit of 50 feet by 150  
feet is produced.  
Page 10  
(4) The entire storage site shall be kept free from accumulation of unnecessary  
combustible materials. Weeds and grass shall be kept down and a regular procedure  
provided for the periodic cleanup of the entire area.  
(5) When there is a danger of an underground fire, that land shall not be used for  
combustible or flammable storage.  
(6) Method of piling shall be solid wherever possible and in orderly and regular  
piles. No combustible material shall be stored outdoors within 10 feet of a building or  
structure.  
(7) Portable fire extinguishing equipment suitable for the fire hazard involved shall  
be provided at convenient, conspicuously accessible locations in the yard area. Portable  
fire extinguishers rated not less than 2A shall be placed so that maximum travel distance  
to the nearest unit shall not exceed 100 feet.  
History: 2015 AACS.  
R 408.41861d Indoor storage.  
Rule 1861d. (1) Storage shall not obstruct, or adversely affect, means of exit.  
(2) All materials shall be stored, handled, and piled with due regard to their fire  
characteristics.  
(3) Noncompatible materials that may create a fire hazard shall be segregated by a  
barrier having a fire resistance of at least 1 hour.  
(4) Material shall be piled to minimize the spread of fire internally and to permit  
convenient access for firefighting. Stable piling shall be maintained at all times. Aisle  
space shall be maintained to safely accommodate the widest vehicle that may be used  
within the building for firefighting purposes.  
(5) Clearance of at least 36 inches shall be maintained between the top level of the  
stored material and the sprinkler deflectors.  
(6) Clearance shall be maintained around lights and heating units to prevent ignition  
of combustible materials.  
(7) A clearance of 24 inches shall be maintained around the path of travel of fire  
doors unless a barricade is provided in which case no clearance is needed.  
(8) Material shall not be stored within 36 inches of a fire door opening.  
History: 2015 AACS.  
FLAMMABLE LIQUIDS  
R 408.41862 Transportation of flammable liquids.  
Rule 1862. (1) Only approved containers and portable tanks shall be used for storage  
and handling of flammable liquids.  
(2) Approved safety cans or department of transportation approved containers shall  
be used for the handling and use of flammable liquids in quantities of 5 gallons or less,  
except that this does not apply to those flammable liquid materials that are highly viscid  
(extremely hard to pour), which may be used and handled in original shipping containers.  
Page 11  
(3) For quantities of 1 gallon or less, the original container may be used for storage,  
use, and handling of flammable liquids.  
History: 1979 AC; 1983 AACS; 2015 AACS.  
R 408.41863 Inside storage.  
Rule 1863. (1) Not more than 25 gallons of flammable liquid shall be stored within a  
room outside of an approved wood or metal cabinet. For storage of liquefied petroleum  
gas, see R 408.41877.  
(2) Not more than 60 gallons of category 1, 2, and/or 3 flammable liquids or 120  
gallons of category 4 flammable liquids shall be stored in any 1 storage cabinet. Not more  
than 3 such cabinets shall be located in a single storage area. Quantities in excess of this  
shall be stored in an inside storage room as prescribed in R 408.41864  
(3) A wood cabinet, when used to store flammable liquids, shall have the bottom,  
back, sides, and top constructed of not less than 1-inch exterior plywood which shall not  
break down or delaminate under fire test conditions. All joints shall be rabbeted and  
secured in 2 directions by flathead wood screws. When more than 1 door is provided,  
there shall be a rabbeted overlap of not less than 1 inch. Steel hinges shall be mounted so  
that the holding capacity is not lost due to loosening or burnout of the screws. The  
cabinet shall be painted inside and out with a fire-retardant paint.  
(4) A cabinet used to store flammable liquids shall be labeled with conspicuous  
lettering,  
"Flammable Keep Away from Open Flames"  
as prescribed in the Construction Safety Standard Part 22 “Signals, Signs, Tags and  
Barricades,” as referenced in R 408.41802.  
(5) A flammable liquid shall not be stored in a building in an area used as a means of  
egress.  
History: 1979 AC; 1983 AACS; 2002 AACS; 2015 AACS.  
R 408.41864 Inside storage room.  
Rule 1864. (1) An inside storage room shall be constructed to meet the required fire  
resistance rating for its use. The construction shall meet the test specifications in The  
National Fire Protection Association Standard NFPA 251 "Standard Methods of Fire  
Testing of Building Construction and Materials," 1990 edition, which is adopted by  
reference in R 408.41802.  
(2) Openings from an inside storage room to another room or building shall be  
provided with noncombustible liquid-tight raised sills or ramps at least 4 inches in height  
or else the floor in the storage area shall be at least 4 inches below the surrounding floor.  
Openings shall be provided with approved self-closing fire doors.  
(3) If wood shelving, racks, dunnage, or floor overlay is used in the room, it shall be  
not less than 1 inch nominal thickness.  
Page 12  
(4) Where other portions of the building or other buildings are exposed, windows  
shall be protected in accordance with NFPA 80 “Standard for Fire Doors and Windows,”  
1970 edition, for Class E or F openings, as adopted in R 408.41802.  
(5) A material that will react with water to create a fire hazard shall not be stored in  
the same room with a flammable liquid.  
(6) Quantities of flammable liquids stored in an inside storage room shall be limited  
in accordance with the criteria prescribed in table 3.  
(7) Every inside storage room shall be provided with either a gravity or a mechanical  
exhausting system and meet all of the following provisions:  
(a) A switch located outside of the door of the inside storage room shall control the  
mechanical exhausting system and any lighting fixtures.  
(b) An electric pilot light shall be installed adjacent to the switch if category 1, 2, or  
3 flammable liquids are dispensed within the room.  
(c) The exhausting system shall commence not more than 12 inches above the floor  
and be designed to provide for a complete change of air within the room not less than 6  
times per hour when flammable liquids are stored in the room.  
(d) Where gravity ventilation is provided, the fresh air intake, as well as the  
exhausting outlet from the room, shall be on the exterior of the building in which the  
room is located.  
(8) An inside storage room shall have at least 1 aisle which shall be not less than 3  
feet in width and which shall be maintained free of obstructions.  
(9) Containers that have more than a 30-gallon capacity shall not be stacked one  
upon another.  
(10) Table 3 reads as follows:  
TABLE 3  
INSIDE STORAGE ROOM  
Total  
Quantities  
Gallons/Square  
Foot/Floor Area  
Allowable  
Maximum Size  
Fixed  
Fire  
Fire Resistance  
Of  
Area  
Storage  
Protection Provided Rating of Room  
Yes  
No  
2 hours  
2 hours  
1 hour  
1 hour  
500 square feet  
500 square feet  
150 square feet  
150 square feet  
10  
4
5
2
Yes  
No  
NOTE: Fire protection system shall be sprinkler, water spray, carbon dioxide,  
or other system approved by a nationally recognized testing laboratory  
for this purpose.  
Page 13  
History: 1979 AC; 1983; AACS; 1995 AACS; 2002 AACS; 2015 AACS.  
R 408.41865 Outside storage.  
Rule 1865. (1) Containers of flammable liquids with not more than 60 gallons in  
each container shall not be stored in excess of 1,100 gallons in any outside storage area.  
(2) Portable tanks stored outside shall not be closer than 20 feet from any building.  
Two or more portable tanks, grouped together, having a combined capacity in excess of  
2,200 gallons, shall be separated by a 5-foot clear area. Individual portable tanks  
exceeding 1,100 gallons shall be separated by a 5-foot clear area. Piles or groups of  
containers shall be separated by a 5-foot clearance.  
(3) Within 200 feet of each portable tank, there shall be a 12-foot wide access way  
to permit approach of fire control apparatus.  
(4) A flammable liquid in an outdoor storage area shall be stored not less than 20  
feet from a building.  
(5) Within 200 feet of each pile or group of flammable containers, a 12-foot wide  
access way shall be maintained to permit the approach of fire control equipment.  
(6) An outside storage area for flammable liquids shall be graded in a manner to  
divert a possible spill away from a building or other hazard, or shall be surrounded by a  
curb or earth dike not less than 12 inches high.  
When a curb or dike is used, provisions shall be made to drain off accumulations of  
water or a spill of a flammable liquid in such a manner that the spill cannot create a  
hazard for an employee.  
The drains shall terminate in a location that will not create another hazard.  
(7) An outside storage area for flammable liquid shall be kept free of weeds, papers,  
debris, and other combustibles not necessary to the storage.  
(8) An above ground tank or loading operation shall not be installed closer than 25  
feet plus 1 inch per 1,000 volts, measured horizontally, from the center line of electric  
power lines, or under an electric power line, except that service entrance and service lines  
may be closer than 25 feet but not over the tanks or loading area. This prohibition shall  
not apply to a fuel oil tank with up to a 275-gallon individual capacity or a 550-gallon  
aggregate capacity that is used for heating purposes.  
(9) A flammable or combustible liquid outdoor storage area shall not occupy any  
area used as a means of egress.  
(10) Underground tanks shall not be abandoned.  
History: 1979 AC; 1983; AACS; 2015 AACS.  
R 408.41866 Portable tanks and emergency venting.  
Rule 1866. (1) A portable tank that has a capacity of 660 gallons or less of  
flammable liquid shall be in compliance with emergency venting and other devices, as  
required by chapters III, IV, and V of The National Fire Protection Association Standard  
NFPA 30, "Flammable and Combustible Liquids Code," 1996 edition, which is adopted  
by reference in R 408.41802.  
Page 14  
(2) A portable tank that has a capacity of more than 660 gallons of flammable or  
combustible liquid shall have emergency venting and other devices, as required by  
chapters II and III of The National Fire Protection Association Standard NFPA 30,  
"Flammable and Combustible Liquids Code," 1996 edition, which is adopted by  
reference in R 408.41802.  
(3) An employer shall contact the Michigan department of licensing and regulatory  
affairs, bureau of fire services, storage tank division, for additional rules concerning the  
installation, use, and storage of liquefied petroleum gases. The storage tank division can  
be reached at 3101 Technology Blvd, Suite H, Lansing, Michigan, 48910; telephone  
number: 517.335.7211 or via the internet at website: www.michigan.gov/storagetanks  
History: 1979 AC; 1983 AACS; 1995 AACS; 2002 AACS; 2015 AACS.  
R 408.41867 Dispensing.  
Rule 1867. (1) An area where a flammable liquid is transferred at 1 time, in a  
quantity of more than 5 gallons from 1 tank or container to another tank or container,  
shall be separate from other operations or a building by a distance of 25 feet or by a wall  
not less than 5 feet high having a fire resistance of not less than 1 hour.  
(2) Provisions shall be made to neutralize spills of flammable liquids. Natural or  
mechanical ventilation shall be capable of maintaining vapor below 10% of the lower  
explosive limit.  
(3) Transfer of a category 1, 2, or 3 flammable liquid from 1 container to another  
shall be done only when the containers are electrically bonded.  
(4) A flammable liquid shall be transferred from or drawn into containers by 1 of the  
following:  
(a) Through a closed piping system.  
(b) From a safety can.  
(c) By a device drawing through the top from a closed container or portable tank, by  
gravity or a pump, through a self-closing valve. Air pressure shall not be used.  
(5) A dispensing device, hose, and nozzle for category 1, 2, or 3 flammable liquids  
shall be an approved type.  
(6) The dispensing units shall be protected from collision damage.  
History: 1979 AC; 1983 AACS; 2015 AACS.  
R 408.41868 Handling at point of use.  
Rule 1868. (1) Not more than 1 day's supply, but not to exceed 25 gallons of  
flammable liquid, shall be permitted to stand outside a cabinet at a place of usage.  
(2) A category 1, 2, or 3 flammable liquid shall not be used where there is an open  
flame or source of ignition within 50 feet of the liquid, unless conditions warrant greater  
clearance.  
(3) Leakage or spillage of a flammable liquid shall be disposed of without creating  
another hazard.  
Page 15  
(4) Natural or mechanical ventilation capable of maintaining the vapor below 10%  
of the lower explosive limit shall be provided and used when a flammable liquid is used  
or handled.  
(5) Category 1, 2, or 3 flammable liquids shall be kept in closed containers when not  
in use.  
History: 1979 AC; 1983 AACS; 2002 AACS; 2015 AACS.  
R 408.41869 Service and refueling areas.  
Rule 1869. (1) A tank truck shall be designed, constructed, and maintained as  
prescribed in The National Fire Protection Association Standard NFPA 385 "Standard  
For Tank Vehicles For Flammable and Combustible Liquids," 1990 edition, which is  
adopted by reference in R 408.41802.  
(2) The dispensing hose shall be an approved type.  
(3) The dispensing nozzle shall be an approved automatic-closing type without a  
latch-open device.  
(4) An emergency switch that is clearly identified and accessible shall be available  
to shut off all power to all dispensing devices in an emergency and shall be in a location  
that is remote from the dispensing device.  
(5) Sources of ignition, such as smoking, open flame, cutting and welding, frictional  
heat, sparks, and heating equipment, shall not be permitted within 25 feet in any direction  
of where an internal combustion engine is fueled or where a flammable liquid is  
dispensed.  
(6) A warning sign prohibiting smoking shall be posted as prescribed in  
Construction Safety Standard Part 22 “Signals, Signs, Tags, and Barricades,” as  
referenced in R 408.41802.  
(7) The motor of any equipment being fueled shall be shut off during the fueling  
operation.  
(8) Flammable liquids shall be stored in approved closed containers, in tanks located  
underground, or in aboveground portable tanks.  
History: 1979 AC; 1983 AACS; 1995 AACS; 2002 AACS; 2015 AACS.  
LIQUEFIED PETROLEUM GAS  
R 408.41871 Rescinded.  
History: 1979 AC; 1983 AACS; 1995 AACS; 2002 AACS; 2015 AACS.  
R 408.41872 Rescinded.  
History: 1979 AC; 1983 AACS; 2013 AACS; 2015 AACS.  
Page 16  
R 408.41873 L.P. safety devices.  
Rule 1873. (1) Every container and every vaporizer shall be provided with 1 or  
more approved safety relief valves or devices. These valves shall be arranged to  
afford free vent to the outer air with discharge not less than 5 feet away, horizontally,  
from any opening into a building which is below such a discharge.  
(2) Shutoff valves shall not be installed between the safety relief device and  
the container, or the equipment or piping to which the safety relief device is  
connected, except that a shutoff valve may be used where the arrangement of this  
valve is such that the full required capacity flow through the safety relief device is  
always afforded.  
(3) Container safety relief devices and regulator relief vents shall be located not  
less than 5 feet in any direction from air openings into sealed combustion system  
appliances or mechanical ventilation air intakes.  
History: 1979 AC; 1983 AACS.  
R 408.41874 L.P. gas appliances.  
Rule 1874. (1) LP-Gas consuming appliances shall be approved types.  
(2) Any appliance that was originally manufactured for operation with a gaseous  
fuel other than LP-Gas, and is in good condition, may be used with LP-Gas only after it is  
properly converted, adapted, and tested for performance with LP-Gas before the  
appliance is placed in use.  
History: 1979 AC; 1983 AACS; 2015 AACS.  
R 408.41875 L.P. containers and equipment.  
Rule 1875. (1) Containers in use shall be in compliance with all of the following  
provisions:  
(a) Each system shall have containers, valves, connectors, manifold valve  
assemblies, and regulators of an approved type.  
(b) Filling of fuel containers for trucks or motor vehicles from bulk storage  
containers shall be performed not less than 10 feet from the nearest masonry-walled  
building, or not less than 25 feet from the nearest building or other construction and, in  
any event, not less than 25 feet from any building opening.  
(c) Filling of portable containers or containers mounted on skids from storage  
containers shall be performed not less than 50 feet from the nearest building.  
(d) All of the following provisions apply to multiple container systems:  
(i) Valves in the assembly of multiple container systems shall be arranged so that  
replacement of containers can be made without shutting off the flow of gas in the system.  
This provision shall not be construed as requiring an automatic changeover device.  
(ii) Heaters shall be equipped with an approved regulator in the supply line between  
the fuel cylinder and the heater unit. Cylinder connectors shall be provided with an  
excess flow valve to minimize the flow of gas in the event the fuel line becomes ruptured.  
Page 17  
(iii) Regulators and low-pressure relief devices shall be rigidly attached to the  
cylinder valves, cylinders, supporting standards, the building walls, or otherwise rigidly  
secured, and shall be so installed or protected from the elements.  
(2) When damage to LP-Gas systems from vehicular traffic is a possibility, the  
employer shall ensure that precautions against such damage are taken.  
(3) Piping, pipe and tubing fittings, and valves used to supply utilization equipment  
within the scope of this standard shall be acceptable for services as approved by the  
manufacture of the equipment.  
(4) Welding is prohibited on containers.  
(5) Valves, fittings, and accessories connected directly to the container, including  
primary shut off valves, shall have a rated working pressure of at least 250 p.s.i.g. and  
shall be of material and design suitable for LP-Gas service.  
(6) Connections to containers, except safety relief connections, liquid level gauging  
devices, and plugged openings, shall have shutoff valves located as close to the container  
as practicable.  
(7) All cylinders shall meet the provisions of the Department of Transportation Title  
49 C.F.R. Part 178, “Shipping Container Specifications,” as adopted in R 408.41802.  
(8) When operational requirements make portable use of containers necessary, and  
their location outside of buildings or structures is impracticable, containers and  
equipment shall be permitted to be used inside of buildings or structures in accordance  
with R 408.41884 (12), (13), and (16), and the following rules:  
(a) Systems utilizing containers having a water capacity greater than 2 1/2 pounds,  
nominal 1 pound LP-Gas capacity, shall be equipped with excess flow valves. Such  
excess flow valves shall be either integral with the container valves or in the connections  
to the container valve outlets.  
(b) Regulators shall be either directly connected to the container valves or to  
manifolds connected to the container valves. The regulator shall be suitable for use with  
LP -Gas. Manifolds and fittings connecting containers to pressure regulator inlets shall be  
designed for not less than 250 p.s.i.g. service pressure.  
(c) Valves on containers having water capacity greater than 50 pounds, nominal 20  
pounds LP-Gas capacity, shall be protected from damage while in use or storage.  
(d) Aluminum piping or tubing shall not be used.  
(e) Hose shall be designed for a working pressure of at least 250 p.s.i.g. Design,  
construction, and performance of hose, and hose connections shall have their suitability  
determined by listing by a nationally recognized testing agency. The hose length shall be  
as short as practicable. Hoses shall be long enough to permit compliance with spacing  
provisions of this rule and R 408.41884 (6), (7), (8), (12), (13), and (16), without kinking  
or straining, or causing hose to be so close to a burner as to be damaged by heat.  
(f) Containers having a water capacity greater than 2 1/2 pounds, nominal 1 pound  
LP-Gas capacity, connected for use shall stand on a firm and substantially level surface  
and, when necessary, shall be secured in an upright position.  
(g) The maximum water capacity of individual containers shall be 245 pounds  
(nominal 100 pounds L.P. gas capacity).  
History: 1979 AC; 1983 AACS; 2002 AACS; 2015 AACS.  
Page 18  
R 408.41876 Rescinded.  
History: 1979 AC; 1983 AACS; 1995 AACS; 2002 AACS; 2015 AACS.  
R 408.41877 Storage of LPG containers.  
Rule 1877. (1) This rule applies to the storage of portable containers whether filled  
or empty if they have been in service.  
(2) Storage of L.P. gas within buildings is prohibited.  
(3) Storage outside of buildings, for containers awaiting use, shall be located away  
from the nearest building or group of buildings as specified in table 4.  
(4) Table 4 reads as follows:  
TABLE 4  
DISTANCE  
BUILDING  
(FEET)  
FROM  
A
QUANTITY OF L.P. GAS STORED  
500 lbs. or less  
0
501 to 6,000 lbs.  
6,001 to 10,000 lbs.  
over 10,000 lbs.  
10  
20  
25  
(5) Containers shall be stored within a suitable ventilated enclosure or otherwise  
protected against tampering, and located as specified in table 4.  
(6) When L.P. gas and 1 or more other gases are stored or used in the same area, the  
containers shall be marked to identify their content. Marking shall be in compliance with  
The Compressed Gas Association Standard CGA C7 "Guide To The Preparation Of  
Precautionary Labeling And Marking Of Compressed Gas Containers," 2000 edition,  
which is adopted by reference in R 408.41802.  
History: 1979 AC; 1983 AACS; 2002 AACS; 2015 AACS.  
R 408.41877a Systems utilizing containers other than DOT containers.  
Rule 1877a. (1) This rule applies specifically to systems utilizing storage containers  
other than those constructed in accordance with DOT specifications. R 408.41875(4)  
applies to this rule unless otherwise noted in R 408.41875(4).  
(2) Storage containers shall be designed and classified in accordance with Table 5.  
TABLE 5  
Contai  
Type  
For gases with vapor  
press.  
Not to exceed lb.  
MINIMUM  
CONTAINER,  
DESIGN  
PRESSURE  
OF  
ner  
LB. PER SQ. IN. GAGE  
Page 19  
per sq. in.  
1949  
edition  
of  
gage at 100 deg. F.  
(37.8 deg. C.)  
ASME Code (Par. U-200,  
U-201);  
1950, 1952, 1956,  
1959, 1962, 1965, and  
1949 and earlier  
editions  
of ASME Code  
(Par. U-68, U-69)  
1968  
(Division  
1)  
editions of ASME Code;  
All editions of  
API-ASME Code(3)  
80(1)  
100  
80(1)  
100  
125  
150  
175  
215  
80 (1)  
100  
100 (1)  
125  
125  
125  
156  
150  
150  
187  
175  
175  
219  
200(2)  
200  
250  
Footnote(1) New storage containers of the 80 type have not been authorized since Dec. 31,  
1947.  
Footnote(2) Container type may be increased by increments of 25.  
The minimum design pressure of containers shall per 100 percent of the container type  
designation when constructed under 1949 or earlier editions of the ASME Code (Par. U-68 and  
U-69).  
The minimum design pressure of containers shall be 125 percent of the container type  
designation when constructed under: (1) the 1949 ASME Code (Par. U-200 and U-201), (2)  
1950, 1952, 1956, 1959, 1962, 1965, and 1968 (Division 1) editions of the ASME Code, and  
(3) all editions of the API-ASME Code.  
Footnote(3) Construction of containers under the API-ASME Code is not authorized after  
July 1, 1961.  
(3) Containers with foundations attached, portable or semiportable b containers with  
suitable steel "runners" or "skids" and popularly known in the industry as "skid tanks,"  
shall be designed, installed, and used in accordance with these rules subject to the  
following provisions:  
(a) If they are to be used at a given general location for a temporary period not to  
exceed 6 months they need not have fire-resisting foundations or saddles but shall have  
adequate ferrous metal supports.  
(b) They shall not be located with the outside bottom of the container shell more  
than 5 feet, 1.52 m, above the surface of the ground unless fire-resisting supports are  
provided.  
(c) The bottom of the skids shall not be less than 2 inches, 5.08 cm, or more than 12  
inches, 30.48 cm, below the outside bottom of the container shell.  
(d) Flanges, nozzles, valves, fittings, and the like, having communication with the  
interior of the container, shall be protected against physical damage.  
Page 20  
(e) When not permanently located on fire-resisting foundations, piping connections  
shall be sufficiently flexible to minimize the possibility of breakage or leakage of  
connections if the container settles, moves, or is otherwise displaced.  
(f) Skids, or lugs for attachment of skids, shall be secured to the container in  
accordance with the code or rules under which the container is designed and built, with a  
minimum factor of safety of 4, to withstand loading in any direction equal to 4 times the  
weight of the container and attachments when filled to the maximum permissible loaded  
weight.  
(4) Field welding where necessary shall be made only on saddle plates or brackets  
that were applied by the manufacturer of the tank.  
History: 2015 AACS.  
R 408.41878 Rescinded.  
History: 1979 AC; 1983 AACS; 2015 AACS.  
R 408.41879 Rescinded.  
History: 1979 AC; 1983 AACS; 2015 AACS.  
R 408.41881 Rescinded.  
History: 1979 AC; 1983 AACS; 2015 AACS.  
R 408.41882 Rescinded.  
History: 1979 AC; 1983 AACS; 2015 AACS.  
R 408.41883 Rescinded.  
History: 1979 AC; 1983 AACS; 2015 AACS.  
TEMPORARY HEATING DEVICES  
R 408.41884 Heating devices.  
Rule 1884. (1) Fresh air shall be supplied in sufficient quantities to maintain the  
health and safety of workmen. Where natural means of fresh air supply is inadequate,  
mechanical ventilation shall be provided.  
Page 21  
(2) When heaters are used in confined spaces, special care shall be taken to provide  
sufficient ventilation in order to ensure proper combustion, maintain the health and safety  
of workmen, and limit temperature rise in the area.  
(3) A temporary heating device shall not be located less than 50 feet from a point  
where a flammable liquid is used or dispensed.  
(4) A temporary heating device that is set on a combustible floor shall be separated  
from the floor by an insulating material or 1 inch of concrete. The insulating material  
shall extend not less than 2 feet beyond the heater in all directions.  
(5) A temporary heating device shall be located not less than 10 feet from a  
combustible covering, such as, but not limited to, canvas or tarpaulins, unless the  
covering is fastened to prevent its dislodgement due to wind action.  
(6) A temporary heating device using L.P. gas, other than in an integral heater-  
container unit, shall be located not less than 6 feet from any L.P. gas container.  
(7) Integral heaters may be used if designed and installed so as to prevent direct or  
radiant heat application to the container.  
(8) Blower-and radiant-type units shall not be directed toward any L.P. gas container  
that is less than 20 feet away.  
(9) If 2 or more heater units are located within the same unpartitioned area, then the  
containers of each unit shall be separated from the containers of any such other unit by  
not less than 20 feet.  
(10) If containers are manifolded together and serve 1 heater on the same floor, then  
the total water capacity of the containers shall not be more than 735 pounds (nominal 300  
pounds L.P. gas capacity). If more than 1 such manifold is used they shall be separated  
by not less than 20 feet.  
(11) Heating devices, including portable heaters and salamanders using a liquid  
flammable fuel such as, but not limited to, fuel oil or kerosene, shall be equipped with an  
approved automatic shutoff safety control device which will, in the event of flame failure,  
shut off the flow of fuel to the main burner and pilot if used. The device shall not be relit  
while the combustion chamber is hot.  
(12) Portable heaters including salamanders shall be equipped with an approved  
automatic device to shut off the flow of gas to the main burner, and pilot if used, in the  
event of flame failure. Such heaters, having inputs above 50,000 British thermal unit's  
(B.T.U.) per hour, shall be equipped with either a pilot, that is lighted and proved before  
the main burner can be turned on, or an electric ignition system.  
NOTE: The provisions of this rule do not apply to tar kettles, hand torches, melting  
pots, or portable heaters of less than 7,500 British thermal unit's (B.T.U.), if used with 2  
1/2 pound containers.  
(13) A temporary heating device shall be installed horizontally level.  
(14) A solid fuel salamander shall not be used in a building or on a scaffold.  
(15) L.P. gas containers valves, connectors, regulators and manifolds, piping, and  
tubing shall not be used as structural supports for heaters and shall be located to minimize  
exposure to high temperatures or physical damage.  
(16) A heating device, including a temporary heating device, designed for  
barometric or gravity oil feed shall be used only with an integral tank.  
(17) Heaters specifically designed and approved for use with separate supply tanks  
may be connected for gravity feed, or an automatic pump, from a supply tank.  
Page 22  
(18) Heating equipment of an approved type may be installed in the lubrication or  
service area where there is no dispensing or transferring of category 1, 2, or 3 flammable  
liquids, provided the bottom of the heating unit is at least 18 inches above the floor and is  
protected from physical damage.  
(19) Heating equipment installed in lubrication or service areas, where category 1, 2,  
or 3 flammable liquids are dispensed, shall be of an approved type for garages and shall  
be installed at least 8 feet above the floor.  
History: 1979 AC; 1983 AACS; 2002 AACS; 2013 AACS; 2015 AACS.  
Page 23