Pressure Relief

Redundant pressure-relief protection is required.

Pressure-relief device systems should be designed per CGA S1.3 "Pressure Relief Device Standards for Cryogenic Tanks".

Pressure-relief devices should be designed to discharge to a safe location in a manner to prevent impingement of escaping liquid or gas upon the vessel, adjacent structures, or personnel.

Pressure-relief devices or vent piping should be designed and located so that moisture cannot collect, freeze, or interfere with proper operation of the device.

If a liquid storage tank has been empty for a year or more, safety features (e.g., pressure-relief devices) should be thoroughly checked before the tank is filled. Tanks that are warm need special filling instructions.

CGA G5.5 presents design guidelines and recommendations for safe operation of hydrogen vent systems for both gaseous and liquid hydrogen installations.

Thermal cycling of rupture disks should be avoided.

Pressure-relief devices should not have their flow impeded.

Manifolded pressure-relief devices should not interfere with the operation of other pressure-relief devices in the manifold.