If I have hydrogen storage tanks, do they need vents?

Nearly all hydrogen storage tanks and hydrogen storage systems will need some type of pressure relief system to protect the vessels from overpressure. If there are pressure relief devices, some means to vent the hydrogen to a safe location will be needed. An exception to this is hydrogen cylinders due to their relief device type (lead-backed rupture discs (CG-4/5) and
the need to transport them.

However, the nature of the devices and vent systems depends on the type, size, location, regulations, and pressure of the hydrogen tank, storage tubes, or tube trailers and related system. There may be other means to protect against overpressure or fire exposure, and there are situations where the risk of a release could exceed the risk posed by the relief device and
vent system. For example, many GH2 transportation trailers in the EU are not equipped with PRD’s or TPRD’s which are not required by local regulations. Ultimately the decision and design of vent systems is based upon a hazard assessment.