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It is a very reasonable to assume that choclab water pumpset has 3 identical pumps (as shown in his sketch) with identical DC motors. An AC motor, purpose of which is to deliver a variable flowrate as required by on-off users, is only installed in systems foreseen with high demand fluctuations...

ref to Nvaporman, I totally agree that cavitation is common to pumps with big volumetric flowrates. now, choclab can easily find out if his problem pump is losing flow/suction due to cavitation. Go to each pump and point one end of your pen to the reducer spool piece (this is the spool connected...

ref to MedicineEng suggestion, due to the big sizes of the pumps and the big maintenance job it will incur, it is more advisable to troubleshoot for any pump internal deterioration by using first the pump curve. If it is possible, pump B should operate alone, make flow variations by throttling...

ref. to dcasto: what you said was correct, and the reverse is is also correct, which is, you lower the energy input (power supply) to the pump driver and the result is lower pumprate. Now, I think choclab should consider troubleshooting using a voltage meter which will take only few minutes...

ref. to katmar, the piping configuration is permanent, however the common inlet pressure is a variable that may create suction stealing. That is why, choclab should compare the common inlet parameters before and after the problem date, and also should investigate if there was any significant...

I found this forum tonight and started membership right away. I like my first input as simple as practical as the following: Based on the problem you stated and the sketch you provided, please consider troubleshooting the following probable causes: 1) The suction line of each pump will have an...