Franklin Park, IL 60131 VALUABLE PUMP FORMULAS

1 VALUABLE PUMP FORMULASP ressure pipe Velocity Centrifugal PumpsRotary Positive Displacement pumps Approximate RPM @ Full Load - for medium sized motorsInsulation Class NEMA Service Factor Rules of Thumb for MotorsParticle Size Comparison Atmospheric Pressure Viscosity Affinity Laws for Centrifugal PumpsFeet of Water X = PSI(PSI X )/Sp. Gr. = Feet of Water(Ft. Head x Sp. Gr.) =PSIPSI x =kPaATM x =PSIATM x =Feet of WaterATM x 760 =mm Hgkg/cm2 x =PSIM eters of Water x =PSIBar x =PSII nches of Hg x =PSIV elocity in Feet GPM x per Second: pipe Area in Square InchesRule of Thumb: Typically, keep pipe velocities around 10 ft/second for good Piping: Generally, have piping in one plane from source tank and have a straight run at least 10 times the pipes diameter leading into the pump Size: Doubling the diameter of a pipe increases its capacity 4 times.

2 Liquid HP: GPM x ft. of Head x Sp. Gr. 3960 Brake HP: GPM x TDH x Sp. Gr. 3960 x Pump Efficiency Efficiency BHP Overall HP: Motor EfficiencyEstimated effects of viscosity on Centrifugal pumps SSU FLOW HEAD EFFICIENCY 35 100% 100% 80% 500 95% 98% 80% 1000 92% 97% 70%Poles RPM Sync RPM Sync (60 Hz) Speed (50 Hz) Speed2 3500 3600 2850 30004 1750 1800 1450 15006 1150 1200 950 10008 850 900 700 750 Synchronous Speed Frequency(Hz) x 120(no load) formula RPM= Number of PolesLiquid HP: GPM x PSI 1714 Volumetric Actual GPM Efficiency: Theoretical GPMO verall Pump LHP Efficiency: BHPM echanical Overall Pump Efficiency: Volumetric EfficiencyA 1500 C 2210 FB 1300C 2660 FF 1550 C 3110 FH 1800 C 3560 FMaximum motor temperature including temperature rise plus 400 C ambient temperatureA motor develops ft-lbs per HP @ 3600 RPM A 3-phase motor draws Amp per HP @ 557 VoltsA motor develops ft-lbs per HP @ 1800 RPM A 3-phase motor draws Amp per HP @ 460 VoltsA motor develops ft-lbs per HP@ 1200 RPM A 3-phase motor draws Amp per HP @ 230 Volts Torque (ft-lbs) x RPM HP x 63,000 5252 RPM Mesh Inch Micron 3250.

3 0002 6 1600 .0005 14 750 .0010 25 325 .0016 40 250 .0024 62 200 .0029 74 180 .0033 85 150 .0041 100 120 .0046 118 100 .0055 149 80 .0070 179 50 .0117 300 40 .0150 385 30 .0200 513 24 .0280 718 20 .0340 872 18 .0390 1000 16 .0450 1154 14 .0510 1308 12 .0600 1538 10 .0750 1923 8 .0970 2488 6 .1320 3385 4 .1590 4077 2 .2030 52051 Micron = 10-6 Meters1 Micron = x 10-5 inch Altitude in Pressure in Feet PSIA 0 100 300 500 700 1,000 1,500 2,000 3,000 4,000 5,000 7,000 10,000 15,000 20,000 25,000 30,000 40,000 50,000 60,000 :SSU* = Centistokes x Engler* = Centistokes x Redwood 1* = Centistokes x Stoke = 100 Centistokes1 Poise = 100 CentipoisesCentistokes = Centipoise/Sp. Gr.*Where Centistokes are greater than 50 Definitions:Newtonian fluids are unaffected by shear, water mineral fluids are affected by shear (5 types).

4 Bingham-Plastic fluids have an exact shear point which once exceeded, viscosity fluids have no exact yield point, but instead, viscosity decreases as the magnitude of shear rate increases. Dilatant fluids viscosity increases as the mag-nitude of the shear rate increases, printing ink, candy fluids decrease in viscosity both in relation to the shear magnitude and the period of time subjected to shear. Viscosity might also depend on a previous shear condition, drilling mud, starches, fluids increase viscosity both in relation to the shear magnitude and the period of time subjected to shear, some greases. These FORMULAS can be used to estimate capacity, head and BHP for a pump speed or impeller diameter when a curve is not readily Flow is directly proportional to the ratio of impeller speed: GPM1 x RPM2 RPM2. Head is directly Proportional to the square of the ratio of impeller speed: RPM2 2 RPM13.

5 The HP is directly proportional to the ratio of impeller speed: RPM 2 RPM14. Flow is directly proportional to the ratio of impeller diameter: Impeller Diameter2 2 Impeller Diameter15. Head is directly proportional to the square of the ratio of Impeller diameter: Impeller Diameter2 2 Impeller Diameter16. The HP is directly proportional to the cube of the ratio of impeller diameter: Impeller Diameter2 2 Impeller Diameter1HP=Torque (in lbs)GPM2 = Head2 = Head1 x BHP2 = BHP1 x Flow2 = Flow1 x Head2 = Head1 x BHP2 = BHP1 xPhone:(847)671-5650 Fax: (847) 3800 North Carnation Street Franklin Park, IL 60131