Strange safety valve wire crossing
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I would like to ask the experts here: what is the purpose of setting the safety valve marked in red in a crosswise position in the diagram?
Release the hazardous materials remaining in the short pipe at the safety valve inlet to facilitate the safe removal of the safety valve.
This design is quite good; it ensures complete containment of emissions. During the calibration or maintenance of the safety valve, all materials are contained and do not escape into the atmosphere.
This setup is generally used in systems with a high level of pressure; this bypass line serves to release any excess pressure or residual material between the safety valve itself and the upstream valve, thereby ensuring safe disassembly
Opening the cross-line can increase the pressure release speed
It is generally installed in high-pressure areas; once the inlet and outlet manual valves are closed, the inlet pressure is high, posing significant risks during disassembly. Therefore, a pressure relief jumper is installed at the inlet
It’s not necessarily used only when removing the safety valve; it’s also needed for releasing pressure from the compressor housing after it stops operating
It is indeed used for pressure relief; it’s very practical when removing safety valves from high-pressure pipelines.
These two safety valves are used in alternation