g.mccormick
Lifetime Supporting Member
We have two submersible waste pumps in a sump. Submittals for the pumps are 1hp, 1.5A@460VAC Motor, 91GPM, 50FT max.
Long story short, the motors were pulling over current and tripping the overloads after long running. The mechanical contractor (supplying contractor) had the pump supplier out. They closed down on a discharge ball valve to increase the discharge pressure and pull the pump backwards on the curve, dropping the motor power. Now, we have issues with the pumps not keeping up, and although we have no way to measure it definitely, it feels like the pumps are not providing the gpm that they should. I have asked about rotation to which the contractor stated it was checked and is correct.
I know that a centrifugal pump running in reverse will still provide some flow albeit much lower performance. Is there any chance that it would also increase current consumption?
Long story short, the motors were pulling over current and tripping the overloads after long running. The mechanical contractor (supplying contractor) had the pump supplier out. They closed down on a discharge ball valve to increase the discharge pressure and pull the pump backwards on the curve, dropping the motor power. Now, we have issues with the pumps not keeping up, and although we have no way to measure it definitely, it feels like the pumps are not providing the gpm that they should. I have asked about rotation to which the contractor stated it was checked and is correct.
I know that a centrifugal pump running in reverse will still provide some flow albeit much lower performance. Is there any chance that it would also increase current consumption?