BASIC FORMULAS H= Head(m) - Rapid Allweiler

Centrifugal and Axial Flow Pump Affinity Laws:Speed changes & impeller diameter remains the same:Q1/Q2 = N1/N2H1/H2 = (N1/N2) P1/P2 = (N1/N2) Impeller diameter changes and speed remains the same:Q1/Q2 = D1/D2H1/H2 = (D1/D2) P1/P2 = (D1/D2) BASIC FORMULAS Q = Flow(m /h)H= Head(m) Density = SGEff = Pump Eff%Capacityl/sec x = m /hm /h = l/secUS gpm = l/minl/min x = US gpmImp gpm x = m /hm /h x = Imp gpm10000 kg/hr =10m hDensity(SG)Head/PressureFt = mm x = Ftm x = kpakpa x = mm x = psiBar x = mBar x 100 = kpam x = Barpsi x = kpaEfficiencyEFF(%) =Q x H x SG367 x kw(abs)Q x H x SG367 x Eff(%)Powerhp x = kwkw x = hpkw abs =Hz x 120No of PolesRPM =RPM x No Of Poles120Hz =Q x (Pipe Dia) Velocity m/sec =Amps x Volts x Power Factor x = = ( ) x = ( x ) + (mm) x x N(Rpm)60 x 1000 Peripheral SpeedPeripheral Speed(Impeller)

Centrifugal and Axial Flow Pump Affinity Laws: Speed changes & impeller diameter remains the same: Q1/Q2 = N1/N2 H1/H2 = (N1/N2)² P1/P2 = (N1/N2)³

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