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Pump Formulas:
Pressure_{Psi} = (Head_{Ft} X Specific Gravity) / 2.31
Head_{Ft} = (Pressure_{Psi} X 2.31) / Specific Gravity
Vacuum_{In Hg} = Dynamic Suction Lift_{Ft.} X .883 X Specific Gravity
Brake HP = (GPM X Head_{Ft.} X Specific Gravity) / (3,960 X Pump Efficiency)
Motor KW = (GPM X H_{Ft.} X Specific Gravity X 0.746) / (3,960 X Pump Eff. X Motor Eff.)
Affinity Laws:
Impeller Diameter Change:
GPM_{2} = D_{2}/D_{1} X GPM_{1}
H_{2} = (D_{2}/D_{1})^{2} X H_{1}
BHP_{2} = (D_{2} / D_{1})^{3} X BHP_{1}
Speed Change:
GPM_{2} = RPM_{2}/RPM_{1} X GPM_{1}
H_{2} = (RPM_{2}/RPM_{1})^{2} X H_{1}
BHP_{2} = (RPM_{2}/RPM_{1})^{3} X BHP_{1}
GPM 
= 
Flow rate in gallons per minute 
H 
= 
Head in feet 
BHP 
= 
Brake Horsepower 
D 
= 
Impeller diameter 
RPM 
= 
Pump speed in revolutions per minute 
