PUMPS ~ Frequently Used Formulas Pumps are hydraulic machines converting mechanical power into hydraulic power. Fluid velocity Calculate the velocity (v) of a fluid in a pipe as follows: v =Q / 6 •A[m/s] Q= flow rate [litre/min] A = inside area of pipe [cm²] Absorbed flow rate Calculate flow rate (Q) as follows: Q= V • n • 10 -3 / hvol [litre/min] V = displacement [cm³/rotation] n = rotation speed [rotations per minute] hvol = pump volumetric efficiency (take 0.95 as an indicative value for rotation speeds ranging between 1000 and 2000 rotations per minute) Absorbed torque Calculate necessary torque (M) of a pump subject to pressure differential between inlet and delivery as follows: M= (V • Dp) / (62.8 • hhm) [Nm] V = displacement [cm³/rotation] Dp = pressure differential [bar] hhm= hydromechanical efficiency (take 0.80 as indicative value under cold conditions and 0.85 under working conditions). Absorbed power Calculate hydraulic power (P), delivered by amotor subject to a pressure differential between input and output as follows: P= (Q • Dp) / (600 • htot) [kW] Q= flow rate [litre/min.] Dp = pressure differential [bar] htot = total pump efficiency (hhm • hvol) Values for hvol and hhm (and consequently htot) depend on pressure differential between supply and delivery, rotation speed, fluid features (temperature and viscosity) and filtering degree. Cast Iron Gear Pumps FCIP2 & FCIP3 Series 4 #DriveLineHarmony www.jbj.co.uk/cast-iron-pumps-motors.html
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