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63.4.13.6.1
Shutoff valves shall be installed in piping containing cryogenic fluids where needed to limit the volume of liquid discharged in the event of piping or equipment failure. [55:8.13.6.1]
63.4.13.6.2
Pressure relief valves shall be installed where liquid or cold gas can be trapped between shutoff valves in the piping system. (See 63.4.2.4.) [55:8.13.6.2]
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