Pump Calculations, Pump Equations

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

Σελίδα 3

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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