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Pressure build up in a pipe system


Ok, having a bit of trouble here. there seems to be a gremlin in a system at work that is causing a pressure build up but we cannot find the cause.

in essence, the system is run off a huge vertical storage vessel, the solvent is pumped out via a pump at approximately 40psig. This then feeds two dispensing guns, 4 large mixers, 5 washers and a dispensing room with three outlets. The pump is only activated when a dispensing point is operational, and stops as soon as operations cease. The issue at hand is that there is a large pressure build up, intermittently, of up 150psig. Enough so that it can blow through a dispensing guns trigger operation. 

Im looking for any help or ideas at what could cause such a build up within this kind of system and to this magnitude. Any ideas are welcome and happy to explain further details if you need more information.   



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You may analyze whether intermittent high pressure has got anything to do with level of solvent in the storage tank?

assuming your transfer pump is a positive displacement pump delivering solvent at 40 psig,please have a look weather flow of solvent gets restricted during high pressure build up.

For proper analysis,few more inputs like flow diagram,pump specification and related operational data is made available from your end.

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