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 2 - Design of Gaseous Hydrogen Systems
Section R. 29.7023 - Equipment assembly
Current through Vol. 24-16, September 15, 2024
Rule 23. Sections 2-4 to 2-4.6 are reproduced from NFPA 50A, and sections 2-4.7 to 2-4.10 of the storage and handling of gaseous and Liquefied H2 code are added as follows:
2-4 Equipment assembly.
2-4.1 Valves, gauges, regulators, and other accessories shall be recommended for H2 service by the manufacturer or the H2 supplier.
2-4.2 Installation of H2 systems shall be supervised by personnel familiar with proper practices with reference to their construction and use.
2-4.3 Storage containers, piping, valves, regulating equipment, and other accessories shall be accessible and shall be protected against physical damage and against tampering by the general public.
2-4.4 Cabinets or housings containing H2 control or operating equipment shall be ventilated to minimize accumulation of H2.
2-4.5 Each mobile H2 supply unit used as part of an H2 system shall be secured to prevent movement.
2-4.6 Mobile H2 supply units shall be electrically bonded to the system before discharging H2.
2-4.7 Emergency shutoff valves shall be approved and shall incorporate all of the following means of closing:
(a) Automatic shutoff through thermal (fire) actuation. Where fusible elements are used, they shall have a melting point not exceeding 250 degrees Fahrenheit (121 degrees Celsius).
(b) Manual shutoff from a remote location.
(c) Manual shutoff at the installed location.
2-4.8 The fill line, when it is independent of the withdraw line on a storage container, shall be equipped with a backflow check valve located as close as practical to the container to prevent discharge of H2 from the container in case of the rupture of the line, hose, or fittings.
2-4.9 Where excess-flow check valves are used, the closing flow shall be greater than the maximum system design flow rate and less than the flow rating of the piping system that results from a complete line failure between the excess-flow check valve and the equipment downstream of the excess-flow check valve.
2-4.10 Gas piping from an outdoor compressor or storage system into a building shall be provided with shutoff valves located outside the building. The shutoff valves shall be readily accessible and as close as practical to the building. Each valve shall be permanently identified.