Variables:    V=Volume per pump stroke in cubic inches
              K=Type of pump (K factor)
              P=Mean operating pressure
              D=Allowable pressure fluctuations as a percentage.
                Plus and Minus from Mean
              n=Polytropic exponent of gas expansion. Nitrogen=0.714
                                                      Air=1.0

V) Volume Per Stroke Calculations:
   1. Gallons Per Minute/Strokes Per Minute = Gallons Per Stroke
      Gallons Per Stroke x 231 Cubic Inches Per Gallon = Cubic Inch Per Stroke
      OR 
   2. .7854 X (Inch Bore Diameter); x Inch Stroke Length = Cubic Inch Per Stroke

K) Type of Pump: Simplex:    Single Acting = .60  Double Acting = .25
   (K Factor)    Duplex:     Single Acting = .25  Double Acting = .15
                 Triplex:    Single Acting = .13  Double Acting = .06
                 Quadruplex: Single Acting = .10  Double Acting = .06
                 Quintuplex: Single Acting = .06  Double Acting = .02

P) Operating Pressure (Mean):     P
   Desired Pressure Fluctuations: Minimum Pressure Pmin = P-(PxD)
                                  Maxmum Pressure  Pmax = P+(PxD)

                                  n
                V x K ( P / Pmin ) 
   FORMULA = -------------------------- = Cubic Inch Capacity Required
                                 n
                 1 - ( P / Pmax )