Pump Calculations, Pump Equations
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Pump Calculations - Pump Equations
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Here's a list of some basic equations that are used in pump sizing. The primary question in choosing a pump is "What horsepower do I need?"
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Symbols used: Multiplica Multiplication: tion: X or * Division: Division: /
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I know what maximum PSI and maximum GPM I need. What size pump do I need? Reciprocating Pump Formula: Minimum Horsepower Horsepower Required = (Max GPM) X (Max PSI) / 1550
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I have a pump with no tags or specifications on it. How do I find out what Gallons Per Minute (GPM) this pump is capable of? (Plunger Radi (Plunger Radius us X Plunger Plunger Radi Radius us X 3.142) 3.142) = Sq. Inch Inches es of Circle Circle (Sq. Inches of Circle) X (Stroke Length) Length) X (Number of Plungers) Plungers) = Cubic Inches Inches of Liquid Per Revolution Cubic Inches of Liquid Per Revolution Revolution / 231 = Gallons Per Per Revolution (Gallons Per Revolution) X (Max RPM) = Gallons Per Minute NOTE: Max RPM in the above NOTE: above equation equation varies accord according ing to typeof pump pump,, size of stroke, stroke, and otherr varia othe variables bles.. Dupl Duplex ex pump pumps s often run abou aboutt 100 RPM Max. whiletriplex pumps pumps will run somewhere between between 100 RPM Max and 400 RPM Max.
I have a reciprocating pump and I know what my max rated rod load is (in foot pounds). I also know what size plunger size my pump has. What PSI will my pump produce? Max. PSI = Rod Rod Load Load Rating Rating of of Pump Pump / (Plun (Plunger ger Radi Radius us X Plunge Plungerr Radi Radius us X 3.142) 3.142)
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Pump Calculations, Pump Equations
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I have a reciprocating pump and I know what my max rated rod load is (in foot pounds). I also know what PSI I need. What size plungers do I need? Min. Plunger Size Needed = Square Root of (Rod Load Rating of Pump / Max. PSI / 3.142)
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 I nches 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.
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Pump Calculations, Pump Equations
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Degrees
Degrees
Specific
Celsius
Fahrenheit
Gravity
Alcohol, ethyl (ethanol)
25
77
0.787
Alcohol, methyl (methanol)
25
77
0.791
Alcohol, propyl
25
77
0.802
Butane, liquid
25
77
0.601
Crude oil, California
15.56
60
0.918
Crude oil, Mexico
15.56
60
0.976
Crude oil, Texas
15.56
60
0.876
Ethane
-89
-128.2
0.572
Ethylene glycol
25
77
1.100
Gasoline, Natural
15.56
60
0.713
Gasoline, Vehicle
15.56
60
0.739
Kerosene
15.56
60
0.820
Methane
-164
-263.2
0.466
Octane
25
77
0.701
Oxygen
-183
-297.4
1.14
Propane
-40
-40
0.585
Propane
25
77
0.495
Water, pure
4
39.2
1.0
Water, sea
25
77
1.025
Material
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