Submitted by: Submitted by rontskhan
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Category: Science and Technology
Date Submitted: 04/06/2013 12:49 PM
Formulas for Centrifugal Pumps
I know what maximum PSI and maximum GPM I need. What size pump do I need?
Centrifugal Pump Formula:
Minimum Horsepower Required = ((Max GPM) X (Max PSI) / 1710) / (Efficiency in Percentage) X (Specific Gravity of Material)
How do I calculate PSI (Pressure in Pounds Per Square Inch) or TDH (Total Dynamic Head)?
Assuming you have one measurement for your pump but not the other:
PSI = TDH / 2.31
TDH = PSI X 2.31
How do I calculate Brake Horsepower Required for a centrifugal pump?
Brake Horsepower Required = GPM Required X (Total Dynamic Head) / 3940 / Efficiency
General Equations
(1) Barrel = 42 gallons
Gallons Per Minute = Barrels Per Day X .0292
GPM = BPD * .0292
HorsePower = Torque in Inch Pounds X (Revolutions Per Minute) / 63,025
HP = ((Torque in Inch Pounds) * RPM) / 63,025
1 US Liquid Gallon = 231 Cubic Inches
1 US Liquid Gallon = 231 Inches^3
1 US Liquid Gallon = 0.13368 Cubic Feet
1 US Liquid Gallon = 0.13368 Feet^3
1 US Liquid Gallon = 3.78541 Liters
1 Liter = 0.26417 US Liquid Gallons
1 Cubic Foot = 7.84 US Liquid Gallons
1 Foot^3 = 7.84 US Liquid Gallons
1 Cubic Foot = 28.31685 Liters
1 Foot^3 = 28.31685 Liters
Cubic Feed Per Day = Cubic Feet Per Minute X 1440
Feet^3 Per Day = (Feet^3 Per Minute) * 1440
Cubic Feet Per Minute = Cubic Feet Per Day Divided by 1440 Minutes Per Day
Feet^3 Per Minute = (Feet^3 Per Day) / 1440 Minutes Per Day
Chart of Relative Density / Specific Gravity
for Common Liquids
Specific Gravity is used when sizing a centrifugal pump. Liquids with a specific gravity greater than 1.0 are heavier than water and conversely, liquids with a specific gravity lower than 1.0 are lighter weight than water and will generally float on water.
Material | Degrees Celsius | Degrees Fahrenheit | Specific Gravity |
Alcohol, ethyl (ethanol) | 25 | 77 | 0.787 |
Alcohol, methyl (methanol) | 25 | 77 | 0.791 |
Alcohol, propyl | 25 | 77 | 0.802 |
Butane,...