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The test circuit used for fatigue tests subjects the filter to start-stop cycles (for evaluating fatigue behaviour under otherwise steady flow conditions), or to cycles of pressure fluctuation (for evaluation of fatigue under pulsating flow conditions). A bubble point test applied to the filter element before the fatigue test, and again after it, will demonstrate the integrity of the filter.
Acceptable figures for cycle life before failure can vary widely with different types of filter element, but as a general guide they are of the order of 10,000 cycles for steady flow operation, and anywhere from 100,000 to 1,250,000 cycles for pulsating flow.

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