Pump Formulas

 

Pressure                       =   Head (Feet) x Specific Gravity
(PSI)                                                 2.31

 

Head                            =   Pressure (PSI) x 2.3
(Feet)                                   Specific Gravity

 

Vacuum                        =   Dynamic Suction Lift (Feet) x .883 x Specific Gravity
(Inches of Mercury)

 

Horsepower                 =   GPM x Head (Feet) x Specific Gravity
(Water)                                       3960 x Pump Efficiency

 

Efficiency                      =   Horsepower (Water) x 100%
(Pump)                                    Horsepower (Brake)

 

NPSH                          =   Positive Factors – Negative Factors
(Available)

 

 

Affinity Laws:  Effect of change of speed or impeller diameter on centrifugal pumps.