PUMP HEAD CALCULATION SHEETPump data Fluid Fluid density Vapor pressure Flow rate % Over design Pump Efficiency 0 Motor efficiency 0 Power factor 0 Suction Side LLL System pressure Ps Line losses H-eye Discharge Side HLL System pressure Pd Line losses Other losses Results 1.00 2 300 10 80 94 96.0 gm/cm 3 m WC m 3/h % % % % Total Diffrential Head (TDH) TDH = 17.5 m 57.4 ft Net Positive Suction Head (NPSHa) NPSHa =10.5 m 34.5 Discharge Head DH= 20.5 ft m 67.3 ft 4.0 0.0 1.0 0.8 12.0 6.0 1.5 1.0 m m m m m m m m Power Requirement HHP = 15.8 BHP = 19.7 MHP = 21.9 hp hp hp Consult motor catalogs to select nearest motor. Pump Estimated Weight valid for BHP < 200 Weight = 225 kg 496 lb Pump flooded 0 Consult VENDOR tables for appropriate values for Em and Pf . . 1 Shutoff head Double suction pump D1 D2 Q1 H1 Hp1 Q2 H2 Hp2 RPM Dia Hshutoff 3.0 o o o The maximum pump efficiency is obtained in the specific speed range of 200 capacity pumps may have a specific speed of 15. Mc Nally .S.0 40.H or at a 40% faster speed without cavitating.3 2. While low h For a given head and capacity the good news is that the pump having the high that will meet the requirements. o Efficiencies start dropping drastically at specific speeds below 1000.85% H shutoff Mc Nally Change speed N1 N2 Q1 H1 Hp1 Q2 H2 Hp2 1750 3500 Field or SI 100 100 5 200. Pumps for high head low capacity occupy the range 500 to 1000.500 6 144 A double suction pump can run with 27% less N.P. Also sm exhibit lower efficiencies than higher capacities at all specific speeds.0 56.Affinity Law Trim diameter Field or SI 8 6 Field or SI 100 100 5 75. Mc Nally BEP = 80% .0 400.000 or larger. probably will be the smallest size and the leas bad news it that it will run at the highest speed where abrasive wear and cavit become a problem. The st speed where abrasive wear and cavitation damage at specific speeds below 1000.3 High 1.000 or larger.550 SSS 9.000 NPSHA / NPSHR 1.1. Margins of NPSHA / NPSHR Suction Energy NPSHMar gin Ratio (NP SHA/NPS HR) Low 1.1.000 NPSHA / NPSHR 1. an run with 27% less N.7 Very High 1.5 Estimate NPSHA Flow 2. Estimate RPMmax Flow 2.7 .P.H. upy the range 500 to 1000.5 NPSHR RPM 20 1903 ugpm ft ft Assume Assume ft rpm Goulds http://www.gouldspumps. and are not normally subject to severe operating restrictions. Pumps with a minimum suction specific speed of 9000 are readily available. unless the pump speed pushes the pump into high or very high suction energy.5 Normally select 1.com/cpf_0008.1 .000 Head 600 NPSHA 30 SSS 9.2.000 Head 600 RPM 3.suction pump Suction Specific speed and NPSH Experience has shown that 9000 is a reasonable value of suction specific speed.S. While low head high ft ft eed of 15.2 . Also smaller capacities capacities at all specific speeds.html .5 NPSHR NPSHA 46 69 ugpm ft rpm Assume Assume ined in the specific speed range of 2000 to 3000. d without cavitating. d news is that the pump having the highest specific speed bly will be the smallest size and the least expensive. 6 Temp rise in 5 min is 8.0 CHEResources .Ht Time WtLiq in pump 4 5.Temperature rise With BHP @ shutoff BHP shutoff Volsystem rLiq Sp.4 Temp rise in 5 min is 17.5 5 210 Hp ft3 lb / ft3 BTU / lb °F min lb Temp rise 1. Time 100 430 0.0 42 0.1 Ludwig 208/1 °F / min °F Temperature rise With Head Head in Head out Fluid cp Pump eff.5 80.0 5 ft ft BTU/°F lb % min °F / min °F 3. Class A 90°C Class B 130°C Class F 155°C Class H 180°C . 5 8.031 ugpm 0.0 ft BTU/°F lb °F 0.0 m3/h Ludwig 208/1 .9 3.Min flow estimate BHPShutoff Max Temp rise 9 3 15.6 Aurora hp °F ugpm m3/h Min flow estimate Head shutoff Fluid cp Temp rise 100 0. Class A 90°C Class B 130°C Class F 155°C Class H 180°C .