how to calculate the pump performance curve vales for Volume flow rate, RPM, Head pressure, pump power, impeller diameter for centrifugal pump. This can be applied to pumps within HVAC industry such as chilled water pumps.
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| Pump Calculations how to calculate pump speed, discharge pressure, rpm, volumetric flow rate, impeller diameter |
In this article, we learn how to perform pump calculations in metric and imperial units to assess pump performance as a result of changes in flow rate, pump speed, discharge pressure, and horsepower. These formulas are rules of thumb for common practice and provide theoretical values by which actual values are likely to differ.
YouTube video tutorial at the bottom of the page.
To calculate the new flow rate of a pump from an increase or decrease in pump speed, the following formula and calculation can be used.
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| How to calculate pump flow by increasing or decreasing pump speed RPM |
Calculate pump flow by increasing or decreasing pump speed RPM
To calculate the new flow of a pump from an increase or decrease in impeller diameter, the following formula and calculation can be used.
Calculate pump flow rate
from a change in impeller diameter
To calculate the new pump speed RPM from an increase or decrease
in flow rate, the following formula and calculation can be used.
 |
| How to calculate pump flow from a change in impeller diameter |
Calculate pump flow from a change in impeller diameter
To calculate the RPM of the new pump speed from an increase or decrease in flow, the following formula and calculation can be used.
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| How to Calculate RPM Pump Speed with Increasing or Decreasing Flow |
Calculate pump speed RPM with increase or decrease in flow
To calculate the new pump discharge pressure from an increase or decrease in the pump rotation speed, the following formula and calculation can be used.
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| How to calculate discharge pressure for an increase or decrease in pump speed rpm |
Calculate the discharge pressure for an increase or decrease in pump speed rpm
To calculate the new pump head pressure from an increase or decrease in flow, the following formula and calculation can be used.
 |
| how to calculate pump discharge pressure for increased or decreased flow rate |
Calculate the pump head pressure for an increase or decrease in flow
To calculate the new pump head pressure from an increase or decrease in pump rotation speed, the following formula and calculation can be used.
 |
| how to calculate discharge pressure to increase or decrease pump speed rpm |
 |
| how to calculate the new pump impeller diameter to accommodate a change in flow |
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