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 2 - Design of liquefied hydrogen systems › Section R. 29.7084 - Liquefied H2 vaporizers

Current through Vol. 24-12, July 15, 2024
Rule 84. Sections 2-6.1 to 2-6.4 are reproduced from NFPA
						50B, and sections 2-6.5 to 2-6.13 of the storage and handling of gaseous and
						Liquefied H2 code are added as follows:
2-6 Liquefied H2
						vaporizers.
2-6.1 The vaporizer shall be anchored and its connecting
						piping shall be sufficiently flexible to provide for the effect of expansion
						and contraction due to temperature changes.
2-6.2 The vaporizer and its piping shall be protected on
						the hydrogen and heating media sections with pressure relief devices.
2-6.3 Heat used in a liquefied hydrogen vaporizer shall
						be indirectly supplied utilizing media such as air, steam, water, or water
						solutions.
2-6.4 A low-temperature shutoff switch or valve shall be
						provided in the vaporizer discharge piping to prevent flow of liquefied
						hydrogen in the event of the loss of the heat source.
2-6.5 Vaporizers shall be designed for a working pressure
						at least equal to the maximum discharge pressure of the pump or the pressurized
						system that supplies them, whichever is greater.
2-6.6 The discharge valve of each vaporizer, if provided,
						its piping components, the relief valves installed upstream of the discharge
						valve, the vaporizer piping, and related components shall be suitable for
						operation at a liquefied H2 temperature of -423 degrees
						Fahrenheit (217.2 degrees Celsius).
2-6.7 Multiple vaporizers shall be manifolded such that
						both inlet and discharge block valves are installed on each vaporizer.
2-6.8 A low temperature switch or other accepted means
						shall be installed on the vaporizer discharge to eliminate the possibility of
						cryogenic H2 entering gaseous H2
						containers and other equipment not designed for cryogenic
						H2 temperatures.
2-6.9 Relief valves on heated vaporizers shall be located
						so that they are not subjected to temperatures exceeding 140 degrees Fahrenheit
						(60 degrees Celsius) during normal operation unless they are designed to
						withstand higher temperatures.
2-6.10 The combustion air required for the operation of
						integral heated vaporizers or the primary heat source for remote heated
						vaporizers shall be taken from outside an enclosed structure or
						building.
2-6.11 Installation of internal combustion engines or gas
						turbines shall conform to R 29.5101 et seq.
2-6.12 Securing of vaporizers. Vaporizers, heat
						exchangers, and similar equipment shall be secured to foundations, and their
						connecting piping shall be flexible to provide for the effects of expansion and
						contraction due to temperature changes.
2-6.13 Vaporizers and heaters shall be provided with
						instrumentation to monitor outlet temperatures.
Exception: Ambient pressure-building coil vaporizers that
						are fed with liquid from, and return vapor to, a container.