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Flow

J Matthers_2
J Matthers_2 Member Posts: 140
in THE MAIN WALL
I currently have a UP 15-42F circ pump on a closed loop to coil 24' above the pump. System pressure is 30 psi and the required flow is 8 gpm. Supply pipe is 1”. Looking at the performance charts it looks like I need a larger pump. Or with the 30 psi closed system does it make a difference?

Comments

  • Carl PE_2
    Carl PE_2 Member Posts: 42
    System pressure makes no difference

    The only pressure the pump sees is the difference between the suction and discharge. You need to figure out the pressure drop through the coil, piping, valves & fittings, and whatever else the water flows through, at 8 gpm.

    Elevation and fill pressure are more or less irrelevant in a closed system, IF npsh is ok.

    Carl
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