Michigan Administrative Code › Department - Licensing and Regulatory Affairs › Bureau of Fire Services › Storage and Handling of Gaseous and Liquefied Hydrogen Systems › Part 3 - STORAGE AND HANDLING OF LIQUEFIED HYDROGEN NFPA 50B › Chapter 4 - Design considerations at specific locations › Section R. 29.7105 - Special rooms

Current through Vol. 24-12, July 15, 2024
Rule 105. Sections 4-4 to 4-4.9.1, and table 4-4.9 of the
						storage and handling of gaseous and Liquefied H2 code
						are added as follows:
4-4 Special rooms.
4-4.1 Floors, 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.
4-4.1.1 Access from within the primary structure shall be
						made through 1 vapor-sealing, 2 hour, self-closing fire door.
4-4.2 Ventilation shall be provided as in section
						4-4.3.
4-4.3 Deflagration venting shall be provided in exterior
						walls or roof only.
4-4.3.1 Vents shall be any 1 or any combination of the
						following:
(a) Walls of light
					 material.
(b) Lightly fastened
					 hatch covers.
(c) Lightly fastened,
					 outward opening doors in exterior walls.
(d) Lightly fastened walls or roof.
(e) Other methods in accordance with NFPA 69,
					 adopted by reference in section 8.
4-4.3.2 Where applicable, snow loads shall be
						considered.
4-4.3.3 The venting area shall be equal to not less than
						1 cubic foot/30 cubic feet (1 cubic meter/9 cubic meters) of room
						volume.
4-4.4 There shall be no sources of ignition.
4-4.5 Electrical wiring and equipment shall comply with
						section 2-7, except that all electrical wiring and equipment in the special
						room shall be class I, division 2, group B.
4-4.6 Heating, if provided, shall be by steam, hot water,
						or other indirect means.
Exception: Electrical heating shall be in accordance with
						section 4-4.5.
4-4.7 Room ventilation.
4-4.7.1 The ventilation shall be at least 1 cubic
						foot/minute/square foot of room area, but not less than 1 cubic foot/minute/12
						cubic feet 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 flammable limit shall not occur in any part of the room.
4-4.7.2 Ventilation shall be by a continuous mechanical
						ventilation system or by a mechanical ventilation system activated by a
						continuously monitoring H2 detection system where a gas
						concentration of not more than 25% of the lower flammable limit is
						present.
4-4.7.3 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.
4-4.7.4 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.
4-4.7.5 The gas detection system shall function during
						ventilation system maintenance operations.
4-4.7.6 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 meeting performance requirements in
						accordance with section 4-4.7 during the normal operating conditions and during
						alarm conditions.
4-4.8 Warning signs.
4-4.8.1 Access doors shall have warning signs with the
						words "WARNING - NO SMOKING - NONORDORIZED FLAMMABLE GAS - CRYOGENIC LIQUID
						-COLD 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.
4-4.9 Indoor attended gaseous H2
						fast-fill fueling.
4-4.9.1 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 gallon/minute
					 (7.2 liter/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 limits 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
					 (i) 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.
Exemption: A dispensing area ventilation system is not
						required when the fuel delivery per refueling event is less than those listed
						in table 4-4.9.
Table 4-4.9
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 shut down the dispenser,
					 stop the flow of gas into the room, and start or continue to run the
					 ventilation system, if required, it shall be in accordance with table 4-4.9.
(1) Reactivation of the dispenser and gas
					 flow into the room shall be by manual restart and shall be conducted by trained
					 personnel.
(i) Interior
					 walls, doors, and window openings within 15 feet (4.6 meters) of the dispenser
					 shall be constructed of materials having a fire rating of at least 2 hours.
					 Wall penetrations shall require use of listed fire-rated equipment.
(j) The owner/operator shall not allow hot
					 work/open flames within 15 feet (4.6 meters) of the refueling location unless
					 the dispenser is shut down, depressurized, and purged.
(k) If H2 is to be
					 removed from the vehicle storage system, H2 shall be
					 discharged into a closed transfer system or vented outdoors in accordance with
					 CGA G-5.5, "Hydrogen Vent Systems," as adopted by reference in section
					 8.