Mich. Admin. Code R. 29.7080
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.
Mich. Admin. Code R. 29.7080