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BigInch, sorry but you are just tempting me to answer you that I would feel much better if I could know the pump curves. As you know every pump undergoes a water performance test at Vendor site to prove its capacity and efficiency. So this is the similar situation, if I knew performance...

BigIinch, such calculations and drawing pump curves will show you that there is pump internal recycle or anything else is going on wrong if your operating points don't match the curve. Acc. to rated flow 6000 uspgm, estimated suction line nominal diameter should be about 30" with 2ft/sec...

Hi I did a simplified simulation. It can be done in Excel . Suction line DP can be expressed as k*V^2, whereas k-coefficient and V-as a flow. If we know that suction lines DP for A,C pumps are negligible so the "k" is equal to almost 0. The same estimation we can set for discharge lines and...

Hi Choclab I did a simulation of these pumps and found them OK. Acc. to me,B pump suction pressure gauge is faulty and B pump is OK. Such big pumps got very low curve slope and you can reduce flow and you did not notice any discharge pressure drop. B pump got some restrictions on discharge...