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[Wong]

Dear experts,

 

            I have a particularly puzzling problem on my hand. We have a dedicated methane line which supplies low pressure methane as blowback to field gauges and analyzers. This methane is letdown from 33 barg to around 8.0 barg via a diaphragm type pressure reducing valve Fisher Type 627.

 

            The pipe is configured in parallel in which we have two pressure reducing valve with the inlet branching out from one common inlet header. We noticed that the outlet pipe from one of the PRD is cold to the touch while the other one is significantly hotter. Both PRD has almost similar settings of 8.3 barg.

 

Only a common pressure gauge measurement is available at field at the point where the outlet of the two PRD merge into a common pipe. 

 

In the past, we have been experiencing vibration issues with the piping where one of the gate valve was damaged as a result. Could the excessive pressure drop brought by the PRD be the culprit?

 

I hope to get some input from industrial experts if they have encountered similar problem before.

 

            

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