RTJ Flange Bottom Groove Radius
RTJ Flange Bottom Groove Radius
(OP)
Anyone seen this before? Typically the radius is 0.8mm in acc with ASME B16.5
Requirement:
Ring type joint in high pressure and elevated temperature environments. The bottom groove radius shall be 3mm minimum
Reasoning:
Leakage from ring joint flanges in these services has occurred due to cracking emanating from the bottom groove radius - this is typically only 0.8mm and stresses imposed on such a sharp radius causes increased stress intensity which can crack under imposed mechanical and thermal loads.
Requirement:
Ring type joint in high pressure and elevated temperature environments. The bottom groove radius shall be 3mm minimum
Reasoning:
Leakage from ring joint flanges in these services has occurred due to cracking emanating from the bottom groove radius - this is typically only 0.8mm and stresses imposed on such a sharp radius causes increased stress intensity which can crack under imposed mechanical and thermal loads.





RE: RTJ Flange Bottom Groove Radius
Does it require a custom ring gasket also? Would this B16.5 RTJ flange turning into a custom designed flanged joint or will be considered fully B16.5 compliant flange?
Cheers,
gr2vessels
RE: RTJ Flange Bottom Groove Radius
Will be expensive too as these will need special machining to comply.