Pump Formulas:
PressurePsi = (HeadFt X Specific Gravity) / 2.31
HeadFt = (PressurePsi X 2.31) / Specific Gravity
VacuumIn Hg = Dynamic Suction LiftFt. X .883 X Specific Gravity
Brake HP = (GPM X HeadFt. X Specific Gravity) / (3,960 X Pump Efficiency)
Motor KW = (GPM X HFt. X Specific Gravity X 0.746) / (3,960 X Pump Eff. X Motor Eff.)
Affinity Laws:
Impeller Diameter Change:
GPM2 = D2/D1 X GPM1
H2 = (D2/D1)2 X H1
BHP2 = (D2 / D1)3 X BHP1
Speed Change:
GPM2 = RPM2/RPM1 X GPM1
H2 = (RPM2/RPM1)2 X H1
BHP2 = (RPM2/RPM1)3 X BHP1
GPM |
= |
Flow rate in gallons per minute |
H |
= |
Head in feet |
BHP |
= |
Brake Horsepower |
D |
= |
Impeller diameter |
RPM |
= |
Pump speed in revolutions per minute |