any interface which could be subjected to max. Third Party believes that the vessel shell i.e. Instead, a proof test is completed on a sample piece of dimple as per Appendix 17 to verify backing plate thickness, dimple design & fabrication. ![]() In essence, a pressure vessel put into atm conditions is not designed for FV just because the dimple is rated for FV. differential pressure between vessel and dimple jacket, as would be the case with a conventional jacket (1.5 x 9 = 13.5 Bar). ![]() (For example, vessel -1 to +3 Bar, dimple jacket -1 to +8 Bar)įor this reason, we would test the vessel to 1.5 times vessel design pressure (4.5 Bar), and the dimple jacket to 1.5 times jacket design pressure (12 Bar). ![]() I have always treated dimple jacket welded onto a pressure vessel as it's own unit, rather than another vessel chamber and / or combination unit. I am currently struggling to agree with our Third Party Inspector on dimple jacket hydrotest requirements per ASME VIII, Div 1.
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