Before or after the check valve on the outlet safety valve of the reciprocating pump
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In the PID provided by the foreign process package supplier for the project currently under development, there are two reciprocating pumps: for one of them, the outlet safety valve is located between the shut-off valve and the check valve in the outlet pipeline； One outlet safety valve is located between the check valve in the outlet pipe and the pump outlet. Now the piping department is asking us which one to follow. What I think is that, since the fluid passing through the check valve theoretically cannot flow back, overpressure is more likely to occur first between the check valve and the shut-off valve. But when asked the veteran employees, they said it actually makes no difference; when there is overpressure, the entire section of the outlet pipe will experience overpressure as well, so it doesn’t matter where it is placed. Could those who have had similar experiences share their thoughts on where exactly it should be placed?
What if the valve disc of a check valve gets stuck and cannot be pushed open?
The safety valve should be located between the check valve in the outlet pipe and the pump outlet; in other words, it is correct for the pump outlet pipe to be directly connected to the safety valve. Both cut-off valves and check valves can develop problems, especially the gate plate of gate valves falling off. The order was reversed, and the accident was severe.
It should be the safety valve, located between the check valve in the outlet pipe and the pump outlet
It should be placed between the pump outlet and the check valve
Installed at the pump’s outlet, the safety valve is designed to protect the pump’s outlet pipeline; whatever issue causes excessive pressure downstream, it should be installed at the pump’s outlet