Pneumatically testing bellows per ASME B31.3 1

[StrainHardened]

Does ASME B31.3 Appendix X preclude testing a bellows expansion joint pneumatically at a reduced pressure as is permitted throughout the rest of the code for other components?

 

[bvi]

The pressure test in Appendix X is designed to prove the expansion joint pressure design. You can test it pneumatically, but the pressure is not reduced. Same pressure is required, either hydrostatic test or pneumatic test.