Centrifiugal Pump:  Typical Expected Efficiency Estimator  (Courtesy and Copyright of www.PumpingMachinery.com)
     

    
 
Useful Formulas:
 
FLOW:
GPM / 4.403 = M3/HR
GPM / 15.9 = liters/sec
 
VELOCITY:
* FT/SEC = gpm x 0.321 / (π x in2 / 4)
* M/SEC = m3/hr x 277.8 / (π x mm2 / 4) = m3/hr x 0.43 / (π x in2 / 4)
 
PRESSURE:
* PSI / 14.7 = atm
PSI / 14.2 = kg/cm2
kg/cm2 = atm / 1.033
PSI / 14.5 = Bars
PSI / 145 = MPa
 
HEAD:
FEET = psi x 2.31 / SG
FEET = psi x 2.31 / SG
METERS = atm x 10.3 / SG = kg/cm2 x 10.0 /SG
 
POWER:
BHP = gpm x ft x SG / 3960 / EFF
KW = m3/hr x m x SG / (367.5 x EFF)
HP x 0.746 = KW
  Single-Stage Centrifugal Pump Multi-Stage Centrifugal Pump
 
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Concept of Pump Head Concept:
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