Code Repair
Code Repair
(OP)
If there is a repair done on the cladding of an atmospheric column around a nozzle, would this be considered a code repair requiring the useof an "R" stamp holder etc. There is a leak noted from the telltale nozzle which has a s.s. insert and is seal welded at both ends of the nozzle. The telltale is drilled in the c/s side up to the sleeve. Most likely the problem we think will be around the seal weld on the vessel I.D. If the cladding is not fully removed can the use of any welder perform the repairs to either overlay build-up or weld to the clad? Also is there a common procedure for doing this repair etc. Any help would be useful.BTW, the clad is 410 S.S. Thank you.





RE: Code Repair
Just an FYI: The scope of the National Board Inspection Code (NBIC) deals with ANY repairs that effect the pressure retaining capability of the item. This would include any welds that join a non-pressure part attachment to a pressure retaining item or its appurtenances (that retain pressure).
RE: Code Repair
RE: Code Repair
For weld repairs to the cladding, I would use either E410 NiMo or ER410 NiMo filler metal. If you need to perform any PWHT, make sure that you allow the repair area to cool to ambient temperature prior to any PWHT.
RE: Code Repair
RE: Code Repair
Also, after weld repairs are completed make sure you perform a Liquid Penetrant (PT) inspection of the repair area to assure compliance with RC-2051 of the NBIC.
RE: Code Repair
Both nozzle plate and clad material are stainless steel type 410. This is not the dissimilar material. Should we use E308 instead of E309?
RE: Code Repair
If welding is being performed directly to the 410 ss cladding and the nozzle plate (which is also 410), I would use the 410NiMo. If welding is being performed between the 410 ss and the carbon steel base material, I would use 309 for this repair, not 308.
RE: Code Repair
RE: Code Repair
In case of welding 410 S.S. with 410NiMo, preheating and PWHT should be performed. I understand that E308 can be used without preheating and PWHT. Please comment.
However, the plate is 321 S.S. Therefore, E308 should not be used here.
jfoe,
This may out of topic. However, please advise us about the design to use several materials in your application. In my experience, 410 should be used at the upper part of column. Austenitic stainless steel (such as 321) should be used at the lower part of column. Where is the location of this nozzle?
For the repair work, I suggest you to check the original WPS before making decision about welding repair work.
RE: Code Repair
Correction in your first statement above; the application of preheat and PWHT requirements are a function of base metal(s) and weld metal. If one or both of the base metals to be joined is 410 ss, preheating and PWHT requirements will be followed for using 410 ss, regardless of weld filler metal.
RE: Code Repair
RE: Code Repair
Thanks for the advice. I used to start a thread about welding 405 S.S. Please comment in Thread725-73081.
RE: Code Repair