Pumps & Motors
Pumping = 1 Hp = 1 GPM x 1500 Psi
(linear relationship i.e. 2 GPM @ 1500 Psi = 2 Hp)
Hp to drive hydraulic pump = Psi x GPM / 1714
Efficiency - typically assume hydraulic pump/motor efficiency of 85%
Hydraulic motor torque (in-lb) = Pressure (Psi) x motor displacement (in3/rev) / (2 x Pi)
Hydraulic motor speed (RPM) = 231 x GPM / motor displacement (in3/rev)
Hydraulic motor power (Hp) = Torque (in-lb) x RPM / 63025