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NPSH-Calculator-For-Process-Engineer
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START NPSH Calculator Author: Dimitrii Pokrovskii dimitrii@engineering-bear.com www.engineering-bear.com Nov. 16th, 2007, Brought to you by www.azpiping.com with permittance from Author 1 - (Start Here) 1 - Start 2 3 - When You're Done W/ Step 3 - Press the Calculate NPSH Button Pump Elevation Relative to Sea Level Pump Operating Parameters System Inlet Height Configuration System Piping Configuration (Optional) (Optional) In most of the bay area it is safe to assume 0 ft. elevation Open System: 1 Pipe Type Schedule 40 2 Pipe Type Schedule 40 3 Pipe Type Schedule 40 Pipe Size (Nominal) 1 inch Pipe Size (Nominal) 1 inch Pipe Size (Nominal) 1 inch Fluid Temperature (through the pump): (32 - 212 F) 45 deg. F Pipe Length 0 ft Pipe Length 0 ft Pipe Length 0 ft Total Pump Volumetric Flow Rate: 0 gpm Flow Rate 0 gpm Flow Rate 0 gpm Flow Rate 0 gpm Atmospheroc Pressure: (can't change) 14.7 PSI 33.957 ft. Water Elevation: 6225 ft. Fluid Vapor Pressure: 0.7516000125 (ft. Water) Fittings Qt. Eq. Length Total Fittings Qt. Eq. Length Total Fittings Qt. Eq. Length Total (above Sea Level) 90 Ells 0 20 0 90 Ells 0 20 0 90 Ells 0 20 0 45 Ell 0 16 0 45 Ell 0 16 0 45 Ell 0 16 0 Water Head: 27.01 ft. Water Globe Valve 0 340 0 Globe Valve 0 340 0 Globe Valve 0 340 0 11.69 (PSIA) Angle Valve 0 150 0 Angle Valve 0 150 0 Angle Valve 0 150 0 Surface Pressure Ball Valve 0 8 0 Ball Valve 0 8 0 Ball Valve 0 8 0 Elevation Reference Table (Just for Viewing) Water Vapor Pressure Reference Table 0 PSIG BF-Valve 0 29.9 0 BF-Valve 0 29.9 0 BF-Valve 0 29.9 0 Geometric Alt. P/Psl Pressure HEAD (water) Water Temp. Vapor Pressure Ck-Valve 0 55 0 Ck-Valve 0 55 0 Ck-Valve 0 55 0 (m) (ft) (untless) (PSI) (ft.) (Deg. F) (ft. Water) Stand. Tee - flow through run 0 20 0 Stand. Tee - flow through run 0 20 0 Stand. Tee - flow through run 0 20 0 0.00 0.00 1.00 14.70 33.94776 80 1 Stand. Tee - flow through branch 0 60 0 Stand. Tee - flow through branch 0 60 0 Stand. Tee - flow through branch 0 60 0 500.00 1640.42 0.94 13.85 31.982184696 100 2 - 0 0 0 - 0 0 0 - 0 0 0 1000.00 3280.84 0.89 13.04 30.11166312 120 4 Total Eq. Length 0 Total Eq. Length 0 Total Eq. Length 0 1500.00 4921.26 0.83 12.26 28.32940572 140 7 2000.00 6561.68 0.78 11.53 26.63201772 180 18 200 28 (Optional) (Optional) (Optional) 212 33.96 4 Pipe Type Schedule 40 5 Pipe Type Schedule 40 6 Pipe Type Schedule 40 Pipe Size (Nominal) 1 inch Pipe Size (Nominal) 1 inch Pipe Size (Nominal) 1 inch Static Head Pipe Length 0 ft Pipe Length 0 ft Pipe Length 0 ft Height: 0 ft. Flow Rate 0 gpm Flow Rate 0 gpm Flow Rate 0 gpm Fittings Qt. Eq. Length Total Fittings Qt. Eq. Length Total Fittings Qt. Eq. Length Total 90 Ells 0 20 0 90 Ells 0 20 0 90 Ells 0 20 0 45 Ell 0 16 0 45 Ell 0 16 0 45 Ell 0 16 0 Globe Valve 0 340 0 Globe Valve 0 340 0 Globe Valve 0 340 0 Angle Valve 0 150 0 Angle Valve 0 150 0 Angle Valve 0 150 0 Ball Valve 0 8 0 Ball Valve 0 8 0 Ball Valve 0 8 0 BF-Valve 0 29.9 0 BF-Valve 0 29.9 0 BF-Valve 0 29.9 0 Ck-Valve 0 55 0 Ck-Valve 0 55 0 Ck-Valve 0 55 0 Stand. Tee - flow through run 0 20 0 Stand. Tee - flow through run 0 20 0 Stand. Tee - flow through run 0 20 0 Stand. Tee - flow through branch 0 60 0 Stand. Tee - flow through branch 0 60 0 Stand. Tee - flow through branch 0 60 0 - 0 0 0 - 0 0 0 - 0 0 0 Total Eq. Length 0 Total Eq. Length 0 Total Eq. Length 0 Design Calculator - Do not Edit Values Here Safety Factor Rel. Roughness Piping 1.3 e = 0.001 Fittings 1.3 HEAD LOSS Total Fitting Eq. L Pipe Length (ft.) Nominal Diam. ID (inch) Pipe ID Area (inch^2) Flow GPM Flow (ft^3/s) Velocity (ft/s) Re e/D Friction Factor HEAD Fittings Head Pipe Sum Ref. NA NA 1 1.049 0.8642529244 NA 0 0.000 0 0.0009532888 NA NA NA NA NA NA 2 2.067 3.3556050137 NA 0 0.000 0 0.0004837929 NA NA NA NA NA NA 3 3.068 7.3926576024 NA 0 0.000 0 0.0003259452 NA NA NA NA NA NA 4 4.026 12.7302643615 NA 0 0.000 0 0.0002483855 NA NA NA NA NA NA 5 5.047 20.0058261663 NA 0 0.000 0 0.0001981375 NA NA NA NA NA NA 6 6.065 28.890262757 NA 0 0.000 0 0.0001648805 NA NA NA NA NA NA 8 8.071 51.1616539632 NA 0 0.000 0 0.0001239004 NA NA NA NA NA NA 10 10.136 80.6906260686 NA 0 0.000 0 0.0000986582 NA NA NA NA NA NA 12 12.09 114.8001572873 NA 0 0.000 0 0.000082713 NA NA NA NA 14 13.125 135.2971054915 NA 0 0.0000761905 0 NA NA NA 1 0 0 1 1.049 0.8642529244 0 0 0.000 0 0.0009533 0.0129149882 0 0 0 4 0 0 1 1.049 0.8642529244 0 0 0.000 0 0.0009533 0.0118020717 0 0 0 2 0 0 1 1.049 0.8642529244 0 0 0.000 0 0.0009533 0.0122844996 0 0 0 5 0 0 1 1.049 0.8642529244 0 0 0.000 0 0.0009533 0.0115140798 0 0 0 3 0 0 1 1.049 0.8642529244 0 0 0.000 0 0.0009533 0.012185459 0 0 0 6 0 0 1 1.049 0.8642529244 0 0 0.000 0 0.00095329 0.0115140798 0 0 0 ft. water Total Frictional Head Loss: 0 PSI 0 Sea Level START Temperature Deg. F Vapor Pres.(ft. Water) Water Vapor Pres. @ Sea Level REPORT Date: 1/31/09 18:27 NPSH Calculation Job Name: Address: Drawings / Page: Max GPM: Constants / Assumptions: Mean Operating Fluid Temperature: 45 ºF Total Flow Through Pump: 0 gpm Atmospheric Pressure: 14.70 PSIA 33.96 ft. Water Pumped Fluid: WATER Vapor Pressure of Liquid: 0.75 ft. water Surface Pressure: 0 PSIG (if exposed to air surface pressure = 0) Piping Configuration: Pipe Sub System#: 1 2 3 4 5 6 Pipe Diam. (Nom): 1 inch 1 inch 1 inch 1 inch 1 inch 1 inch Pipe Length: 0 feet 0 feet 0 feet 0 feet 0 feet 0 feet Flow Rate: 0 gpm 0 gpm 0 gpm 0 gpm 0 gpm 0 gpm Total Pipe Pressure Drop: 0.0 ft. Water 0.0 ft. Water 0.0 ft. Water 0.0 ft. Water 0.0 ft. Water 0.0 ft. Water 0.0 0.0 psi 0.0 psi 0.0 psi 0.0 psi 0.0 psi 0.0 psi 0.0 Valves (Fully Open) / Fittings 1 2 3 4 5 6 Qt. Eq. Length Total Qt. Eq. Length Total Qt. Eq. Length Total Qt. Eq. Length Total Qt. Eq. Length Total Qt. Eq. Length Total 90 Ells 0 20 0 0 20 0 0 20 0 0 20 0 0 20 0 0 20 0 45 Ell 0 16 0 0 16 0 0 16 0 0 16 0 0 16 0 0 16 0 Globe Valve 0 340 0 0 340 0 0 340 0 0 340 0 0 340 0 0 340 0 Angle Valve 0 150 0 0 150 0 0 150 0 0 150 0 0 150 0 0 150 0 Ball Valve 0 8 0 0 8 0 0 8 0 0 8 0 0 8 0 0 8 0 BF-Valve 0 29.9 0 0 29.9 0 0 29.9 0 0 29.9 0 0 29.9 0 0 29.9 0 Ck-Valve 0 55 0 0 55 0 0 55 0 0 55 0 0 55 0 0 55 0 Stand. Tee - flow through run 0 20 0 0 20 0 0 20 0 0 20 0 0 20 0 0 20 0 Stand. Tee - flow through branch 0 60 0 0 60 0 0 60 0 0 60 0 0 60 0 0 60 0 - 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Total Eq. Length Total: 0 0 0 0 0 0 0 Fitting Pressure Drop: 0.0 ft. water 0.0 ft. water 0.0 ft. water 0.0 ft. water 0.0 ft. water 0.0 ft. water 0.0 0.0 psi 0.0 psi 0.0 psi 0.0 psi 0.0 psi 0.0 psi 0.0 Description Additonal Pressure Drops: input here 0.0 ft. water input here 0.0 ft. water input here 0.0 ft. water input here 0.0 ft. water input here 0.0 ft. water Total: 0.0 ft. water Total Head Loss (Pipe + Fittings + Additional Drops) : 0.0 Results (Static Head) (Vapor Pressure) (Loss in Fittings) NPSHA NPSHA = 34.0 + 0.0 + 0.0 - 0.8 - 0.0 - 0.0 - 0.0 = 33.21 ft. Water (Atmospheric Pressure) (Surface Pressure) (Loss in Pipe Length) (Additonal Loss) Net Positive Suction Head Available Pump Schedule #: NPSHR 0 ft. Water MFR: Net Positive Suction Head Required Model #: (From Pump Curve) Safety Factor Enter NPSHR liquid level h liquid level -h inlet inlet (Positive) Height (Negative) Height Calculate NPSH Clear Systems dimitriip: If you need to update effective length simply enter them into sub system 1 and the rest will update. View Report Each sub system is defined by a fitting that either changes the pipe size or a Tee that combines or separates flow. Edit NPSH Parameters View Flow Calculations TABLE DATA PDF Table of Schedule 40 & 80 Pipe Geometry Schedule 40 Schedule 80 Nom. Diam. ID ID Inchs Inches Inches 1/8 0.269 0.215 1/4 0.364 0.302 3/8 0.493 0.423 1/2 0.622 0.546 3/4 0.824 0.742 1 1.049 0.957 1 1/4 1.38 1.278 1 1/2 1.61 1.5 2 2.067 1.939 2 1/2 2.469 2.323 3 3.068 2.9 3 1/2 3.548 3.364 4 4.026 3.826 5 1/9 5.047 4.813 6 6.065 5.761 8 1/9 7.981 7.625 10 10.02 9.564 12 1/9 11.938 11.376 14 13.124 12.5 16 1/9 15 14.314 18 16.874 16.126 20 1/9 18.814 17.938 24 22.626 21.564 DEVELOPMENT This Data is for Development Purposes ASI-NPSH Calculator VS HVAC PUMP Handbook HVAC PUMP Handbook - Author: James B. Rishel Note: Trying tofigure out how my fluids results compare to the table values found in the handbook and the pump wheel Flow Rate (GPM) Handbook Head Loss for 100ft of Pipe (ft of Water) Asi Calculator Head Loss for 100 ft of Pipe (ft of Water) looks like there is a safety factor associated with the table values when compared to the theoretical values. More testing needs to be done with a wider range of flows and pipe sizes 1000 Rel. Roughtness Pressure Drop in 100 ft. of Pipe 1500 e = 0.001 My Value Flow Wheel DI GPM 2000 Ratio 1.0 1.85 2.4 3 100 2250 1.5 1.95 3 90 2500 Rel. Roughness 0.92 1.2 3 70 2750 e = 0.001 0.68 0.9 3 60 3000 Ration 1.3 2.7 2.7 5 400 3250 1.6 1.6 5 300 3500 2.4 2.3 6 700 3750 1.2 1.3 8 900 4000 1.5 1.6 8 1000 4250 4500 4750 5000 5250 5000 DEVELOPMENT 0 0 0 0 My Value ASHRAE Value 0 0 0 0 0 My Value ASHRAE Value ASHRAE = 1.0016 * (My) dimitriip: I added a correction factor to my value of 1.3 My Value * 1.3 = My New Value MBD000ED909.bin
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