R-stamp
R-stamp
(OP)
I know this has been discussed for many times whether R-stamp is requred or not. It seems the opinion is very divided.
Now I just got a phone call from south America, a new vessel arrived but missing a platform support clip. Jobsite will weld the clip, and asking me R-stamp is required or not. Any expert please advise. Is there any code case to waive the R-stamp just for welding a clip ?
Now I just got a phone call from south America, a new vessel arrived but missing a platform support clip. Jobsite will weld the clip, and asking me R-stamp is required or not. Any expert please advise. Is there any code case to waive the R-stamp just for welding a clip ?





RE: R-stamp
After hydrotest, one should not weld a missing lug, a missing skirt, a missing nozzle or anything the manufacturer considers a valuable attachment post completion of manufacture.
I can see incomplete vessel delivered 'in time', without all the welded attachments, to be added on site. Who can stop this, if it is not illegal to add welded attachments? How about adding a couple of new lifting lugs, because the existing ones by design error are interferring with a nozzle??
Any welded attachment must be rigurously designed, fabricated and installed in accordance with the code and the regulating authority.
I would not allow welding the clip without R-stamp.
Cheers,
gr2vessels
RE: R-stamp
RE: R-stamp
Platform clips carry significant load. Welding such clips to vessel is a repair, not routine repair, and requires R-stamp.
RE: R-stamp
Now come to serious part: this vessel was PWHT'd due to wet sour service, 5/8" thick carbon steel. The fillet weld for clip is only 1/4". Since the clip is not facing the content, can I just preheat to 200F without doing local PWHT ? My thinking is, due to the small fillet weld, the hardness of the base metal on inside shall not have any impact ?
RE: R-stamp
RE: R-stamp
RE: R-stamp
RE: R-stamp
RE: R-stamp
Not true. I can't tell you how many times end users have questioned why a contractor needs an R-Certificate for repair work on this web site because either they do not want to spend the dollars and have a qualified repair organization or the end user simply does not know. This is typically the main problem, not about specific stamping because the NBIC is very clear about what is stamped.