After studying my pump curves, here are my latest thoughts.
When the pump starts, even if it is slowly ramped up by a vfd or soft sart, there will be a point where the pressure will exceed the main header pressure and the check valve will open. At that time, the pump will be trying to suddenly...
I forgot to mention that we are also considering installing a Cla-Val surge anticipator valve in the main header to deal with the water hammer issue.
One argument I've heard is that the Cla-Val pump control valve allows the pump to start against zero pressure, since the valve is still closed...
I am working with a local municipality to replace their aging water tower booster pumps. The big question is whether to replace the pumps and Cla-Val booster pump control valves, or just put all the pumps on VFD. We're worried about water hammer and I don't see how the VFD wouldn't work just...
