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btrueblood, georgeverghese , LittleInch, Thank you very much for your answers. I will try to answer everything. Does the pump ever dead-head against a closed valve : Not up to now. Does it drop below the rated minimum flow rate : some systems have no flow switch or transmitter after the REX...

Dear georgeverghese, Thank you for your answer. We stop the gas generation first, then wait a few so that bubbles can escape the water loop, and then we start depressurisation of the tank by venting. The pump is powered at least until the tank pressure has returned to atmospheric. Eric

Btrueblood, Thank you again for you reply. Here are the answers: Debris: no the system are always cleaned up to our best before being started. It pumps only water, and we never found such debris in the pumps. Operation : the pumps are started when the system is at rest (atmospheric pressure)...

Btrueblood, Thank you for you reply. The last 2 failed pumps were multistage centrifugal self priming pumps. Failure usually happen during the first trial runs, and results in damaged shaft seals and twisted shaft. We previously had several screw pumps fail (with similar damages) on another...

Dear all, We face a recurring problem in some of small electrolysis installations during depressurization. This systems operate a close loop including a pressurized water/gas separating tank up to 40 barg a centrifugal pump usually located at a lower elevation than the tank some filters a...