What is the ‘static inlet head’ on a pump spec?

eggerb

If a pump has a specification that states ‘max inlet head’, what is this referring to? Am I correct in understanding head is just pressure? So, the ‘static inlet head’, is the pressure of the incoming water into the pump?

I turned a few valves in my hot press recently after a small leak that I sorted. I turned the valves going into my Stuart st55 shower pump including both (hot & cold) inlet valves. The pump is on the floor of the hot press less than 20cm from the 18”x42” hot water cylinder. The cold water storage tank is directly over the hot press so about 3 metres above the pump.

Question then! Should I give the inlet valves going into the pumps a few turns down so the pressure is not in excess of the pump stated ‘static inlet head’? If I leave the inlet valves fully open, am I going to wreck the pump and need a new one soon? Thanks.

xl500

eggerb wrote: »

If a pump has a specification that states ‘max inlet head’, what is this referring to? Am I correct in understanding head is just pressure? So, the ‘static inlet head’, is the pressure of the incoming water into the pump?

I turned a few valves in my hot press recently after a small leak that I sorted. I turned the valves going into my Stuart st55 shower pump including both (hot & cold) inlet valves. The pump is on the floor of the hot press less than 20cm from the 18”x42” hot water cylinder. The cold water storage tank is directly over the hot press so about 3 metres above the pump.

Question then! Should I give the inlet valves going into the pumps a few turns down so the pressure is not in excess of the pump stated ‘static inlet head’? If I leave the inlet valves fully open, am I going to wreck the pump and need a new one soon? Thanks.

Closing Down the Valves will have no effect on Static Pressure

Static Pressure is the Standing Pressure at Standstill and a Pinhole will create the same static Pressure as a full open valve but Flow rate is different

eggerb

xl500 wrote: »

Closing Down the Valves will have no effect on Static Pressure

Static Pressure is the Standing Pressure at Standstill and a Pinhole will create the same static Pressure as a full open valve but Flow rate is different

Thanks very much xl500. So, I haven’t done anything that might cause damage to the pump by just opening the valves? Should I leave the inlet valves fully open? I’m assuming the outlet valve opening doesn’t affect anything really other than the flow as well? Thanks again

Calahonda52

eggerb wrote: »

Thanks very much xl500. So, I haven’t done anything that might cause damage to the pump by just opening the valves? Should I leave the inlet valves fully open? I’m assuming the outlet valve opening doesn’t affect anything really other than the flow as well? Thanks again

If you restrict the inflow too much you may get cavitation, also need to have both open the same amount: normally open fully and close back a half turn so that less chance of the valve sticking in the fully open position