UG-99(a)(1), cosmetic grinding after hydrostatic test
UG-99(a)(1), cosmetic grinding after hydrostatic test
(OP)
Hi,
according to you, can we grind flush longitudinal and circumferential butt weld after hydrostatic test according to UG-99(a)? Please take note that grinding will be done without affecting the required thickness of the shell.
If yes, what are your references (standard, books, etc.)?
Regards,
Hcjulien
according to you, can we grind flush longitudinal and circumferential butt weld after hydrostatic test according to UG-99(a)? Please take note that grinding will be done without affecting the required thickness of the shell.
If yes, what are your references (standard, books, etc.)?
Regards,
Hcjulien





RE: UG-99(a)(1), cosmetic grinding after hydrostatic test
RE: UG-99(a)(1), cosmetic grinding after hydrostatic test
thank you for your quit reply. UG-99(a)(1) only mention ''base material''. Is that include weld?
Regards,
hcjulien
RE: UG-99(a)(1), cosmetic grinding after hydrostatic test
RE: UG-99(a)(1), cosmetic grinding after hydrostatic test
because it's not 100% clear in the ASME Section VIII div. 1 UG-99(a) paragraphs, do you have a reference book, interpretation, etc. with a clear mention that weld cap reinforcement are included in the ''base material'' mentionned in UG-99(a)(1)?
Thank in advance,
hcjulien
RE: UG-99(a)(1), cosmetic grinding after hydrostatic test
In my opinion, grinding flush the weld is not considered "cosmetic". Was it possible to perform the grinding prior to hydrostatic test? If your answer is YES, then you have violated the Code. UG-99(a)(1) is very clear on that.
You can still grind flush the weld, but you need to re-hydrotest. Check with your AI.
RE: UG-99(a)(1), cosmetic grinding after hydrostatic test
Now, the key words are "after fabrication is completed". If the vessel was hydrotested and stamped prior to flat topping welds, in my opinion you have met all of the necessary code requirments. Flat topping welds for purposes of installation or to enhance field examination for TOFD or conventional UT no longer falls under the ASME B&PV Code. An in-service repair code like API or the NBIC takes precedence. Once the vessel has been hydro tested and stamped it is completed.
If the vessel was hydrotested and not stamped because flat topping was performed before stamping, I would have to agree with doct9960 that fabrication was not completed and you must re-hydrotest before stamping.