welding overlay for compensating thickness loss

[starfarooq]

we have a pressure vessel of which the bottom shell portion (cylindrical) severely corroded due to which there is a thickness loss of 8 mm (original thickness was 34 mm and now it is 26 mm). There is an option of replacing the bottom shell course by new one but it will take a lot of time and we cannot afford plant shutdown for long time. For a quick fix we are thinking of developing a welding overlay over the corroded portion to compensate for the thickness loss. Is this solution in line with code?
See attached picture for clarity

 

[chicopee]

You should have posted your inquiry in the boiler and pressure vessel forum. To answer your question, weld overlay is acceptable to ASME/NB fired and unfired pressure vessels. Guidelines are available in the National Board Inspection Code (NBIC) and you should get a copy in order to understand the requirements. Looking at your sketch, it appears that there is extensive corrosion, therefore, weld overlay may or may not be acceptable. I am assuming that you are in the USA, therefore, you should contact a jurisdictional authorized inspector for approval to your request and if approved you should comply with the NBIC requirements.

 

[racookpe1978]

Going to take a good bit of time to do the welding! I think there will room for two welders working - What is the ID?

What material?

Preheat required?

How are you going to supply clean air, power, lights, ventilation, fume exhaustion, supplies, and still have room to move around and grind and work?

 

[racookpe1978]

Heck - Weld build up the outside. Spray deposit? Or simple stick SMAW?

 

[starfarooq]

can somebody tell about some company which provide the services of repairing such vessels?