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. 29.7080 - Pressure relief devices

Current through Vol. 24-12, July 15, 2024
Rule 80. Sections 2-2.1 to 2-2.5 are reproduced from NFPA
						50B, and sections 2-2.6 to 2-2.16 of the storage and handling of gaseous and
						Liquefied H2 code are added as follows:
2-2 Pressure relief devices.
2-2.1 Stationary liquefied hydrogen containers shall be
						equipped with pressure relief devices sized in accordance with CGA S-1.3,
						Pressure Relief Device Standards -Part 3 - Compressed Gas Storage
						Containers.
2-2.2 Portable liquefied hydrogen containers complying
						with DOT Specifications and Regulations shall be equipped with pressure relief
						devices as required in DOT Specifications and Regulations. Pressure relief
						devices shall be sized in accordance with the requirements of CGA S-1.1,
						Pressure Relief Device Standards -Part 1 - Cylinders for Compressed Gases, and
						CGA S-1.2, Pressure Relief Device Standards - Part 2 - Cargo and Portable
						Containers for Compressed Gases.
2-2.3 Pressure relief devices shall be arranged to
						discharge unobstructed to the outdoors and in such a manner as to prevent
						impingement of escaping liquid or gas upon the container, adjacent structures,
						or personnel. (See 3-1.5 for venting of pressure relief devices in special
						locations.)
2-2.4 Pressure relief devices or vent piping shall be
						designed or located so that moisture cannot collect and freeze in a manner that
						would interfere with proper operation of the device.
2-2.5 Pressure relief devices shall be provided in piping
						wherever liquefied hydrogen could be trapped between closures.
2-2.6 Stationary containers shall be provided with a
						sign, in letters not less than 1 inch (2.54 centimeters) in height, placed in
						proximity to the primary container pressure relief valve vent stack that warns
						against spraying water on or into the vent opening.
2-2.7 The pressure-relief device shall have the capacity
						to prevent the pressure inside the container from exceeding 110% of the maximum
						design pressure.
2-2. 8 H2 venting systems
						discharging to the atmosphere shall be in accordance with CGA G-5.5, adopted by
						reference in section 8.
2-2.9 Components which come in contact with cryogenic
						H2 under normal operating conditions shall be suitable
						for operation at a temperature of -430 degrees Fahrenheit (-236 degrees
						Celsius).
2-2.10 Individual discharge lines and adapters shall be
						sized, located, and secured so as to permit the maximum required relief
						discharge capacity to minimize the possibility of physical damage. The
						discharge lines shall be able to withstand the pressure of the relief vapor
						discharge when the relief is in the full-open position.
2-2.11 Secondary relief devices, designed to provide
						additional relief in emergencies, shall be piped away from the container
						independently.
2-2.12 Shutoffs between pressure-relief devices and
						containers. Shutoff valves shall not be installed between pressure-relief
						devices and containers unless the valves or their use meets the requirements of
						this section.
2-2.12.1 Security. Shutoff valves shall be of a locking
						type and their use shall be limited to service-related work performed by the
						supplier under the requirements of ASME "Boiler and Pressure Vessel Code,"
						adopted by reference in section 8.
2-2.12.2 Multiple pressure-relief devices. Shutoff valves
						controlling multiple pressure-relief devices on a container shall be installed
						so that either the type of valve installed or the arrangement provides the full
						required flow through the minimum number of required relief devices at all
						times.
2-2.13 Safety and relief valves. Pressure relief valves
						for liquefied H2 systems, if externally adjustable,
						shall be provided with a means for sealing the adjustment to prevent
						tampering.
2-2.13.1 If at any time it is necessary to break such a
						seal, the valve shall be removed from service until it has been reset and
						sealed.
2-2.13.2 Adjustments shall be made only by the
						manufacturer or other organizations having competent personnel and facilities
						for the repair, adjustment, and testing of such valves.
2-2.13.3 The organization making such adjustment shall
						attach a permanent tag with the setting, capacity, and date.
2-2.14 The thermal expansion relief valve shall be
						installed as required to prevent overpressure in any section of a liquid or
						cold vapor pipeline that can be isolated by valves.
2-2.14.1 Thermal expansion relief valves shall be set to
						discharge above the maximum pressure normally expected in the line but less
						than the rated test pressure of the line it protects.
2-2.14.2 Discharge from thermal expansion relief valves
						shall be directed so as to minimize hazard to personnel and other
						equipment.
2-2.15 Pressure relief valves shall be tested at least
						every 5 years.
Exception: Thermal relief valves will not be
						tested.
2-2.16 Heat exchangers, vaporizers, insulation casing
						surrounding containers, vessels, and coaxial piping systems in which liquefied
						or cold vapor H2 could be trapped shall be provided with
						a pressure-relief device.