Fatigue life design can be seen from the failure type and cause analysis of tetrafluoro compensator that the plane stability, circumferential stability and corrosion resistance of bellows are all related to their displacement, i.e. fatigue life. Low fatigue life will lead to the decline of the stability and corrosion resistance of bellows. According to the test and operation experience, the fatigue life of bellows used in heating engineering should not be less than 1000 times.

Bellows can not bear load, they should be lifted separately. Except for the pre-stretching or cold pre-deformation required by the design, it is strictly forbidden to use the method of deforming the bellows to adjust the installation deviation of the pipeline. During the installation process, welding slag is not allowed to splash on the surface of the bellows and other mechanical damages are suffered. All movable components of the bellows are not allowed to be subjected to external components. Stuck or restrict the normal operation of its moving parts.

Most of the failure of tetrafluoro bellows is caused by external environment corrosion. Therefore, when designing the structure of tetrafluoro compensator, the contact between external corrosion medium and bellows can be considered.

For example, for the external pressure axial compensator, the packing sealing device can be added between the outlet end ring and the outlet pipe. Its function is equivalent to sleeve compensator, which can not only resist the invasion of external corrosive medium, but also add a safety barrier to the tetrafluoro compensator. Even if the bellows are damaged, the compensator can also play a compensating role and avoid wave. Ribbon failure.