Is it necessary to release the pressure inside a reciprocating compressor after it is shut down?

The hydrogen compressor I saw was depressurized, with the flow going to the incinerator via a safety valve bypass line.

Safety valves are generally sealed, right? As long as they don’t discharge directly, there’s no problem

Don’t all presses have air valves? When shut down normally, closing their inlet and outlet should prevent pressure from building up inside. As for the internal pressure, considering sealing issues, it’s best to release it through a safety valve bypass. Also, when starting up the press, if a unloader is used, there must be pressure inside; switching using the inlet valve requires pressure relief.

Maintain a pressure of 2.0 kilograms of nitrogen in standby mode

All hydrogen compressors need to have their pressure released after shutdown. By design, they should all have pressure relief lines. If there is no pressure relief line, it can be done through the safety valve bypass. After depressurization, the vessel can be nitrogen-purged using inlet nitrogen. Used as a backup. If pressure is not released, the following consequences will occur: if the compressor’s exhaust valve does not close properly, it may lead to backpressure, causing the safety valve on the low-pressure stage to activate. The packing seals of compressors are all dynamic seals; they may leak when at rest. If leakage occurs outside the isolation box, it can lead to exposure to the atmosphere, especially since the venting is usually done at high altitudes. If there is hydrogen sulfide in the hydrogen compressor, the area where the equipment is located will have a strong odor.

Of course it needs to be removed; it can be discharged directly to the flare, with nitrogen used for displacement