repad repair

[younginspection]

I have recently had repair done to a repad to shell of a vessel with 45 MAWP and i am curious whether i need to place a "alteration/repair" logo on the vessel. We did not breach the envelope nore even really touch the shell. The crack was only in the weld material itself and my MT report states this. Please reference any info that you may have support from Sect.VIII Div.1

 

[metengr]

If the vessel is in service, the work performed would be a repair under either API 510 or the National Board Inspection Code. ASME B&PV Code Section VIII does not deal with in-service repairs.

 

[younginspection]

This vessel was brought to our shop as many other things needed to be updated, however, this was the only part of the vessel updates that required us to have an AB-40 completed.

 

[stanweld]

Does your shop have an R-Certificate?

 

[younginspection]

We are an Alberta Canada shop certified to B31.3, B31.1, Section VIII Div. 1 (alteration and repair). Mostly what I need to know is how far do i really need to go with this project considering the cracking was only in the weld material and not in the vessel material itself.

 

[weldtek]

Have you discussed the scope of work with your AI? If so what did he/she say? Sounds like a routine repair under NBIC rules.

 

[metengr]

Canada does not enforce the NBIC. It does recognize the NBIC as a reference document and I believe API 510. This sounds like a repair under an in-service repair code. Have you checked with the local regulatory body to determine what you need to document? This is what I would do.

 

[younginspection]

Thank you all for your info.

 

[chicopee]

In the US, if the weld repair that you did is to a pressure part, then you'll need a "R" stamp. A repad, is part of the calculations to determine the limits of reinforcement, so in essence you are repairing a pressure part. My reference is the 1987 NBIC which may or may not apply to your pressure vessel as I don't now to which code it was built.

 

[C2it]

Has anybody stopped to consider why a re-pad has cracked ?

 

[chicopee]

It is the weld to the repad that cracked and yes it should be investigated.

 

[younginspection]

Someone had backed into the skid support putting a minor dent in the frameing resulting in residual stresses on that particular weld which resulted in cracking.