Hydraulic Oil Pumps - Horsepower Required

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A practical formula for calculating horsepower required by a hydraulic pump

can be expressed as

P_HP = q p / 1714        (1)

where

P_HP = horsepower (HP)

q = required pump capacity (gpm)

p = required pressure (psi)

• 1 gpm (US) =6.30888x10^-5 m³/s = 0.227 m³/h = 0.06309 dm³(litre)/s = 2.228x10^-3 ft³/s = 0.1337 ft³/min = 0.8327 gpm (UK)
• 1 psi (lb/in²) = 144 psf (lb_f/ft²) = 6,894.8 Pa (N/m²) = 6.895x10^-3 N/mm² = 6.895x10^-2 bar
• 1 hp = 745.7 W

Example - Hydraulic Pump

Power required by a a pump with 20 gpm capacity and 1500 psi pressure can be calculated as

 P_HP = 20 (gpm) 1500 (psi) / 1714

    = 17.5 HP

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