Michigan Administrative Code › Department - Licensing and Regulatory Affairs › Bureau of Fire Services › Storage and Handling of Gaseous and Liquefied Hydrogen Systems › Part 2 - STORAGE AND HANDLING OF GASEOUS HYDROGEN NFPA 50A › Chapter 4 - Design considerations at specific locations › Section R. 29.7041 - Indoor H2 storage system location

Current through Vol. 24-12, July 15, 2024
Rule 41. Sections 4-4 to 4-4.6, and table 4-4.1of the
						storage and handling of gaseous and Liquefied H2 code
						are added as follows:
4-4 Indoor H2 storage system
						location.
4-4.1 H2 systems 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 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
Material
No gas cabinet, gas room, or exhausted enclosure
Gas cabinet, gas room, or exhausted enclosure
No gas cabinet, gas room, or exhausted enclosure
Gas cabinet, gas room, or exhausted enclosure
Cryogenic liquid (flammable or oxidizing)
45 gal
90 gal
90 gal
180 gal
Flammable gas liquefied nonliquefied
14 kg3 (30 lb)
27 kg3 (60 lb)
27 kg3 (60 lb)
55 kg3 (120 lb)
28 m3 (1,000
								  ft3)
28 m3 (2,000
								  ft3)
28 m3
(2,000
								  ft
3
)
56 m3 (4,000
								  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 H2 is 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 H2 is 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).