Hydraulic Motor/Fluid Power Equations

Hydraulic Motor Equations:

Fluid HP = 5.83×10^-4Q∆P= Q∆P/1715

Mechanical HP = 1.585×10^-5TN=TN/63,025

Torque, lb-in = 36.8∆PDgal = ∆PD_in.3/2 π=0.159∆PD_in.³

Cost/Hour = KW × ($/kWH) = hp × 0.746 × ($/kWH)

Symbols:

D_gal = displ., gal/rev

D_in.³ ₌ displ., in.³/rev

Q= gmp

∆p= pressure drop, psi

T= torque, lb-in

N = speed, rpm

∆N= rpm change (const. accel)

∆t = time interval, sec

W = weight, lb_m

K = radius of gyration, in.

See Hydraulic Motor/Fluid Power Conversions