Selecting Centrifugal Pumps - KSB
flow of water at 0 °C in cubic metres per hour at a pressure drop of bar L m Length of pipe Ls m Straight length of airfilled pipe M Nm Moment NPSHr m NPSH required by the pump NPSHa m NPSH available Ns Specific speed in US units n min– (rpm) Speed of rotation s– (rev/s) nq min– Specific speed in metric units P kW (W) Power; input power 1
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