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Hydraulic Pump Calculations


Hydraulic Pump


Horsepower Required to Drive a Pump

Gallons Per Minute (GPM)     Pounds/Sq Inch (PSI)     Horsepower
Example: How many horsepower are needed to drive a 5 gpm pump at, 1500psi
Formula: GPM x PSI x .0007 = horsepower needed


Pump Output Flow (in Gallons per Minute)

Pump RPM                   Pump Displacement (in3)         Output Flow
Example: How much oil will be produced by a 2.5 cubic inch pump operating at, 1200 rpm?
Formula: RPM x Displacement ÷ 231 = gpm


Pump Displacement Needed for GPM of Output Flow

Gallons Per Minute (GPM)     Revolutions per Minute (RPM)     Pump Displacement
Example: What displacement is needed to produce 5 GPM at, 1500 RPM?
Formula: 231 x GPM ÷ RPM = in3 per revolution


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