This test is designed to determine whether a pump is operating within design parameters.
For any pump test, the pump flow at
The difference between the pump flow of two operating pressures is the flow loss.
Method of determining flow loss | ||
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Pump flow at |
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− | Pump flow at |
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Flow loss |
Example of determining the flow loss | ||
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Flow loss that is expressed as a percentage of pump flow is used as a measure of pump performance.
Method of determining percent of flow loss | ||||
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Flow loss (L/min or US gpm) | × | 100 | = | Percent of flow loss |
Pump flow at |
Example of determining percent of flow loss | ||||
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× | 100 | = | 9.5% |
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Note: The values in the examples are not set values for any specific pump or for any specific pump condition. See the Specification for your machine for the pump flow of a new pump at
Install a flow meter. Run the engine at high idle. Measure the pump flow at
Formula 1 | |||||
Pump flow at |
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− | Pump flow at |
× | 100 | = | Percent of flow loss |
Pump flow at |
If the bench test can be performed at
If the bench test cannot be performed at
Measure the pump flow at
For the bottom part of the formula, run the pump shaft at 2000 rpm. Measure the pump flow at
Formula 2 | |||||
Pump flow at |
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Pump flow at |
× | 100 | = | % percent of flow loss | |
Pump flow at |