Equipment assembly

Rule 82. Sections 2-4.1 and 2-4.2 are reproduced from NFPA 50B, and sections 2-4.3 to 2-4.8 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 suitable for liquefied hydrogen service and for the pressures and temperatures involved. 2-4.2 Installation of liquefied hydrogen systems shall be supervised by personnel familiar with proper installation practices and with their construction and use. 2-4.3 Aboveground containers, piping, valves, regulating equipment, and other accessories shall be readily accessible and shall be protected against physical damage and against tampering.

2-4.4 An automatic emergency shutoff valve shall be located in liquid product withdrawal lines as close to the container as practical. 2-4.5 The automatic shutoff valve shall be provided with a remotely located, manually activated, shutdown control. 2-4.6 The shutoff valve shall be connected to the storage container by means of welded connections without the use of flanges, or other appurtenances except that a manual shutoff valve equipped with welded connections is allowed to be installed immediately upstream of the automatic shutoff valve to allow for maintenance of the automatic valve. 2-4.7 Connections downstream of the shutoff valve shall be in accordance with ASME B31.3, "Process Piping," adopted by reference in section 8. 2-4.8 Cabinets or enclosures containing H2 control equipment shall be ventilated to prevent any accumulations of H2 gas.

History: 2008 AACS.