ISO/NP 22056-6

Aerospace series — Lubricant filter elements test methods — Part 6: Resistance to flow fatigue

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This part of the ISO-22056 applies only to lubrication filter elements for applications that experiences flow fluctuations such as transmission lubrication and Constant Speed Drive generators (CSD)/Integrated Drive Generators (IDG) lubrication.

This part of ISO 22056 specifies a method for determining the resistance of a filter element to flow fatigue caused by varying flow through the filter in various stages of the filter contaminant loading process. The filter is subjected to a uniform varying flow rate for a specified number of cycles, at a number of predetermined differential pressures.

Although the number of cycles and differential pressure conditions used in this part of ISO 22056 is meant to simulate possible service conditions, this part of ISO 22056 is not intended to qualify a filter element under replicate conditions of service; this can only be done by a specific test protocol developed for the purpose, including actual conditions of use, for example the operating lubricant, contamination, and exact cyclic flow conditions.

This part of ISO 22056 procedure describes the laboratory conditions for the test and will need to be augmented by system level testing including actual conditions of use, for example the stress caused by cyclic differential pressures induced by a variable flow rate

The test data resulting from application of this part of ISO 22056 can be used to compare the performance of aerospace lubricant filter elements.