Simplified FormulaCylinderArea - A(Sq. In.) = π × Radius (inch) 2A= π × R 2(Sq.In.) = π × Diameter (inch) 2/ 4A= π × D 2 / 4CylinderForce - F(Pounds)= Pressure (psi) × Area (sq.in.)F= P × ACylinderSpeed - v(Feet/ sec.) = (231 × Flow Rate (gpm)) /(12 × 60 × Area)v= (0.3208 × gpm) / ACylinderVolume Capacity - VVolume= π × Radius 2 × Stroke(In.) / 231V = π × R 2× L / 231(L = length of stroke)CylinderFlow Rate - QVolume= 12 × 60 × Velocity (Ft./Sec.) × NetArea(In.) 2 / 231Q= 3.11688 × v × AFluidMotor Torque - TTorque(in. Lbs.) = Pressure (psi) × disp.(in. 3 / rev.) / 6.2822T= P × d / 6.2822Torque= HP × 63025 / RPMT= HP × 63025 / nTorque= Flow Rate (GPM) × Pressure × 36.77/ RPMT= 36.77 × Q × P / nFluidMotor Speed - nSpeed(RPM) = (231 × GPM) / Disp.(in.) 3n= (231 × GPM) / dFluidMotor Horsepower - HPHP = Torque (in. Lbs.) × rpm / 63025HP= T × n / 63025. Simplified FormulaPumpOutput Flow - GPMGPM= (Speed (rpm) × disp.

1. 1 Hp = Rpm
2. How Much Torque Per Horsepower
3. Rpm And Torque To Hp

1 Hp = Rpm

In.)) /231GPM= (n ×d) / 231PumpInput Horsepower - HPHP= GPM × Pressure (psi) / 1714× EfficiencyHP= (Q ×P) / 1714 × EPumpEfficiency - EOverallEfficiency = Output HP / Input HPE Overall= HP Out / HP In X 100OverallEfficiency = Volumetric Eff. × MechanicalEff.E Overall= Eff Vol. × Eff Mech.PumpVolumetric Efficiency - EVolumetricEfficiency = Actual Flow Rate Output(GPM) / Theoretical Flow Rate Output(GPM) × 100Eff Vol.= Q Act. / Q Theo.X 100PumpMechanical Efficiency - EMechanicalEfficiency = Theoretical Torque to Drive/ Actual Torque to Drive × 100Eff Mech= T Theo.

How Much Torque Per Horsepower

/ T Act.× 100PumpDisplacement - CIPRDisplacement(In. 3 / rev.) = Flow Rate(GPM) × 231 / Pump RPMCIPR= GPM × 231 / RPMPumpTorque - TTorque= Horsepower × 63025 / RPMT= 63025 × HP / RPMTorque= Pressure (PSIG) × Pump Displacement(CIPR) / 2πT= P × CIPR / 6.28.

Rpm And Torque To Hp

GeneralFluid Power Guidelines:Horsepower for driving a pump:For every 1 hp of drive, the equivalent of1 gpm @ 1500 psi can be produced.Horsepower for idling a pump:To idle a pump when it is unloaded will requireabout 5% of it's full rated powerWattage for heating hydraulic oil:Each watt will raise the temperature of 1gallon of oil by 1° F. Per hour.Flow velocity in hydraulic lines:Pump suction lines 2 to 4 feet per second,pressure lines up to 500 psi - 10 to 15 ft./sec., pressurelines 500 to 3000 psi - 15 to 20 ft./sec.; all oil lines inair-over-oil systems; 4 ft./sec.