How to know the fatigue life of corrugated compensator

How to know the fatigue life of corrugated compensator
Fatigue life test of bellows compensator:
 
1 . The bellows compensator test should be carried out on a special fatigue compensator test device. The fatigue compensator test device should ensure that the pressure thrust and displacement reaction force of the bellows can be suppressed, and the axial cyclic displacement applied is coaxial with the axis of the bellows.
 
2 . For the compensator test bellows should be all other type test items are qualified bellows, the number of corrugations should not be less than three waves. The structure of other parts of the test piece can be designed according to the compensator test device to meet the test requirements of the compensator.
 
3 . Compensator test medium can be tap water, compressed air, inert gas and oil and other media.
 
4 . For the bellows design temperature is lower than the material temperature of the expansion joint, the compensator test temperature is room temperature.
 
5 . Compensator test pressure is equal to the design pressure, the compensator test pressure fluctuation value is not greater than the compensator test pressure ± 0%. Or design equivalent axial displacement. The test cycle rate of the corrugated compensator should make the displacement evenly distributed on each corrugation, and should be less than 25mm / s