Plunger Load or Piston Load = Pd x Face Area of Piston or Plunger

TORQUE = 5252 X H.P / RPM

RPM = Revolutions Per Minute
GPM= Gallons Per Minute
U.S. Gallon = 231 Cu. In.
One Barrel = One Petroleum Barrel
Petroleum Barrel = 42 U.S. Gallons
BPH = Barrels Per Hour
GPM = BPD X 0.7
GPM = BPD / 34.3
BPH = GPM/0.7

Horsepower Required =Input at the Pump Pinion or Crankshaft.
___________________________________________

TO CALCULATE HORSEPOWER

Horsepower for Single Acting Plunger Pump =
(GPM)(PD)(100)- (GPM)(PS)(EM.-5)/(1714)(EM.)-(1714)(EM)

Horsepower for Double Acting Piston Pump=

(GPM) (Pd-Ps)(100)/(1714)(Em.)

Horsepower for Double Acting Piston Pump=

(GPM) (Pd-Ps)(100)/(1714)(Em.)

Where:
Pd = Pump Discharge Pressure, Pounds Per Square Inch (psi)

PS = Pump Suction Pressure, Pounds per Square Inch (psi)

Em = Pump Mechanical Effiency