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ChExpress Blog - 10/30/14

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Gear Pump Discharge Relief Valve


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#1 ayan_dg

ayan_dg

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Posted 08 October 2010 - 11:45 AM

I have a gear pump . For deadhead protection I have installed a Relief valve in its discharge. I can route the discharge of the relief valve to pump suction or to the suction vessel. Please tell me of these two which is better option and why ?

#2 Art Montemayor

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Posted 08 October 2010 - 02:37 PM



I hope you have installed an independent PSV on the gear pump discharge and are not relying on the often-supplied, built-in PSV supplied with some gear pumps. You should have a fully calculated and documented PSV. A manufacturer's PSV that is built as part of the pump does not give you any calculations or documentation.

ALWAYS pipe the discharge of the pump's discharge PSV directly to the source tank for relief. NEVER pipe the PSV's discharge to the pump's suction line. That is a naive and foolish thing to do because it upsets the pump's ability to pump. I won't go into the same, repetitive details that have been discussed in many threads on the same subject throughout our Forums in the past.

I hope this helps.





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