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. 29.7040 - Special rooms

Current through Vol. 24-12, July 15, 2024
Rule 40. Sections 4-3.2 to 4-3.6 are reproduced from NFPA
						50A, and sections 4-3.1, 4-3.7 to 4-3.9, and table 4-3.9 of the storage and
						handling of gaseous and Liquefied H2 code are added as
						follows:
4-3 Special rooms.
4-3.1 Floor, walls, and ceiling shall be constructed of
						noncombustible or limited-combustible materials. Interior walls or partitions
						shall have a fire resistance rating of at least 2 hours, shall be continuous
						from floor to ceiling, and shall be securely anchored. At least 1 wall shall be
						an exterior wall. Windows and doors shall be located so as to be readily
						accessible in case of emergency.
Exception: Window glazing may be of plastic.
4-3.1.1 If access to the room from outside the primary
						structure is not possible, access from within the primary structure shall be
						made through 1 vapor-sealing 2-hour self-closing fire door.
4-3.2 Ventilation shall be as provided in section
						4-2.2.
4-3.3 Explosion venting shall be as provided in section
						4-2.3.
4-3.4 There shall be no sources of ignition from open
						flames, electrical equipment, or heating equipment.
4-3.5 Electrical equipment shall be in accordance with
						Article 501 of NFPA 70, National Electrical Code, for Class I, Division 2
						locations.
4-3.6 Heating, if provided, shall be by steam, hot water,
						or indirect means except that electrical heating shall be permitted to be used
						if in compliance with 4-3.5.
4-3.7 Room ventilation.
4-3.7.1 The ventilation shall be at least 1 cubic
						feet/minute/square feet (0.3 cubic meters/minute/square meters) of room area,
						but not less than 1 cubic foot/minute/12 cubic feet (0.3 cubic
						meters/minute/3.7 cubic meters) of room volume and shall be designed such that
						an accumulation of H2 at a concentration equal to or
						greater than 25% of the lower flammability limit shall not occur in any part of
						the room.
4-3.7.2 Where installed, a gas detection system shall be
						equipped to sound an alarm and visually indicate when a maximum of 25% of the
						lower flammable limit is reached. At 40% of the lower flammable limit the gas
						detection system shall shut down the hydrogen system and provide notification
						to the system operator.
4-3.7.3 Any failure of the ventilation system shall
						immediately shut down the fueling system and provide notification to the system
						operator. Reactivation of the fueling system shall be by manual restart and
						shall be conducted by trained personnel.
4-3.7.4 The gas detection system shall function during
						ventilation system maintenance operations.
4-3.7.5 A ventilation system for a room within or
						attached to another building shall be designed to ensure that all areas
						serviced by the ventilation system meet performance requirements in accordance
						with section 4-3.7 during the normal operating conditions and during alarm
						conditions.
4-3.8 Warning signs.
4-3.8.1 Access doors shall have warning signs with the
						words "WARNING - NO SMOKING - NON ODORIZED FLAMMABLE GAS - NO OPEN FLAMES. The
						wording shall be in plainly legible, bright red letters not less than 1 inch
						(2.54 centimeters) high on a white background.
4-3.9 Indoor attended fast-fill fueling.
4-3.9.1 Attended indoor fast-fill fueling system shall be
						in accordance with subsections (a) to (k) of this section.
(a) Gas storage equipment shall be located
					 outdoors unless approved by the department. Gas processing and compression
					 equipment shall be listed or approved for indoor use or located
					 outdoors.
(b) An emergency manual
					 shutdown device shall be located in the dispensing area not less than 20 feet
					 (6.1 meters) and not more than 100 feet (30.5 meters) in the path of egress
					 from the dispensing area. Actuation of the emergency manual shutdown device
					 shall perform in accordance with subsection (h) of this section.
(c) The dispenser shall be equipped with a
					 gas detection system which shall actuate in accordance with subsection (h) of
					 this section when a maximum of 25% of LFL is detected (1%
					 H2 in air).
(d) The dispenser shall be equipped with a
					 leak detection system capable of identifying a leak from the dispensing system
					 outside the dispenser housing by conducting a pre-fill pressure test. The leak
					 detection must be capable of detecting a minimum leak rate of 1.9
					 gallons/minute and shall actuate in accordance with subsection (h) of this
					 section when a leak is detected.
(e) Whether the fill is communicated or
					 non-communicated, the dispensing system must be listed, labeled, or approved to
					 insure that the fills are protective of the safety of the temperature, pressure
					 and flow rate of the on-board fuel system during fueling.
(f) The dispensing area shall be equipped
					 with a fire detection system and shall actuate in accordance with subsection
					 (h) of this section if a fire is detected.
(g) A ventilation system shall be installed
					 for the dispensing area. The ventilation system shall be capable of delivering
					 ventilation air as provided in section 4.3.7. The ventilation system shall
					 operate prior to dispenser operation, during fueling, and for at least 1 minute
					 after fueling has been completed. The ventilation flow rate shall be monitored.
					 Failure or reduction of the ventilation flow rate below the required flow rate
					 shall shut down the dispensing system.
Exception: A dispensing area ventilation system is not
						required when the fuel delivery per refueling event is less than those listed
						in table 4-3.9. Table 4-3.9
Room Size (m3)
Maximum fuel delivery per refueling event that
								  does not require room ventilation (kg)
1000
0.8
2000
1.7
3000
2.5
4000
3.3
5000
4.2
(h) The actuation of any 1 of the systems
					 listed in subsections (b) to (g) of this section shall be in accordance with
					 table 4-3.9, and shall shut down the dispenser, stop the flow of gas into the
					 room, and start or continue to run the ventilation system, if required.
1. Reactivation of the dispenser and gas flow
					 into the room shall be by manual restart and shall be conducted by trained
					 personnel.