Hydraulic Pump Calculations
Displacement from Measurements (inches)
Theoretical cubic inches displacement per shaft revolution (C.I.R)?
Formula: 6*W*(2*D-L)*(L-D)/2 = CIR
Horsepower Required to Drive a Pump
Example: How many horsepower are needed to drive a 5 GPM pump at 1500 PSI?
Formula: GPM x PSI / 1714 = horsepower needed
Pump Output Flow (in Gallons per Minute)
Example: How much oil will be produced by a 2.5 cubin inch pump operating at 1200 rpm?
Formula: RPM x Displacement / 231 = gpm
Pump Displacement Needed for GPM of Output Flow
Example: What displacement is needed to produce 5 GPM at 1500 RPM?
Formula: 231 x GPM / RPM = in³ per revolution