Static head is simply the height of the water column (when nothing is moving). This can be easily converted to psi (1 vertical ft = 0.433 psi). Dynamic head includes the frictional losses in the pipes, hoses, fittings etc. The max head with pump in regard to pump specs (performance curves) is the shut off head or max height the pump is capable of, but even though the fluid will reach this height, the flow will be zero. At anything less than the max head, there will be flow and the flow will increase as the head decreases. The rate of change is not linear and that's why the performance curve is necessary. There is also the head on the suction side of a pump to consider which will offset the pressure head on the output side. I may not have this exactly right, but it should be a reasonably close explanation.
why do i suck at Whirlpool?
- Thread starter slakwhere
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Static head is simply the height of the water column (when nothing is moving). This can be easily converted to psi (1 vertical ft = 0.433 psi). Dynamic head includes the frictional losses in the pipes, hoses, fittings etc. The max head with pump in regard to pump specs (performance curves) is the shut off head or max height the pump is capable of, but even though the fluid will reach this height, the flow will be zero. At anything less than the max head, there will be flow and the flow will increase as the head decreases. The rate of change is not linear and that's why the performance curve is necessary. There is also the head on the suction side of a pump to consider which will offset the pressure head on the output side. I may not have this exactly right, but it should be a reasonably close explanation.
OP
OP
slakwhere
Well-Known Member
that makes perfect sense. 
OP
OP
slakwhere
Well-Known Member
i may try that as well once the new head gets here
BrewBeemer
Well-Known Member
I may sound over the top on pump performance I use two times the flow you think you need. Elevation changes (head) input / output, length of lines plus every fitting especially direction changes like 90 degree fittings restrict flow.
Best part with magnetic pumps you can throttle them down, underpowered
pumps your just flat screwed. A complete system all in 1/2" ID lines and fittings without restrictive quick disconnects will flow properly.
Best part with magnetic pumps you can throttle them down, underpowered
pumps your just flat screwed. A complete system all in 1/2" ID lines and fittings without restrictive quick disconnects will flow properly.
