Column internal cladding - Local thickness reduction for Weld Overlay 1

[FPPE]

Hi,

We have to build a column in SA-516-70 internally cladded in SA-240-316L (3 mm) for colamination.
In the circumferential joints we would have to remove about 3 mm in the carbon steel base material because we will have to perform the weld overlay so that we have 3 mm undiluted, getting to the same inside diameter as the colamined area (so about 6 mm total WO).

We have performed this in the past and no NoBo has ever commented on it, but I would like to understand if EN 13445 allows us to remove a few mm (which by calculation would not verify the equations) for just the area of the circumferential welds in the base material to then perform the WO.

If the design code was ASME we could consider the WO cooperating in those areas, definitely going to satisfy the equations. Does EN 13445 have any requirements for this? Or does ASME also allow this localized reduction without considering the WO collaborating?

Thank you

 

[FPPE]

Someone could help?

 

[SJones]

Is the first layer not going to be 309, so which composition has to be undiluted?

Steve Jones
Corrosion Management Consultant

http://www.linkedin.com/in/drstevejones

All answers are personal opinions only and are in no way connected with any employer.

 

[GD2]

Op,
You are fabricating the column out of SA 516 Gr 70 plates. Why are you talking only about circumferential joints and not longitudinal joints?
Because you are doing a weld metal overlay clad (as opposed to integral cladding), you need to keep mind of the vessel design thickness before you remove the base metal.
I thought you will grind flush the vessel internal welded joint and do the 3 mm cladding on it.

GDD
Canada

 

[SJones]

IOGP S-619, Annex J, Figure J.7

Steve Jones
Corrosion Management Consultant

http://www.linkedin.com/in/drstevejones

All answers are personal opinions only and are in no way connected with any employer.