Opening Part Repair?

[sk10009]

Hi everyone.

2" opening part in the center of the 80" elliptical head have been cut because of my carelessness.

I am considering reparing that place.
How to Repair?
Is it possible to fill up a hole with plate and butt welding?
I'd like to be given some advice and reference codes.

Thanks.

 

[AravindSujay]

Dear SK,

2" hole that too in the elliptical head can be considered as some nozzle if horizontal vessel or some vent nozzle if it is a vertical vessel. so install a nozzle with a blind flange.

Still u can fill the hole with a plate with supportive calculations regarding the area - but pls get confirmation before u proceed.

Bye

 

[SnTMan]

sk10009, this is not at all an ususual situation, I am working an NCR for the same at this time.

Weld repair the hole either with a plug of the parent metal if possible, or just with weld metal. Full penetration weld. Full RT and MT/PT the finished weld. PWHT if required by Code or contract documents, if any.

If your material is CS or austenitic SS this is probably all that is required. If the material requires PWHT you may need to confirm the physicals for the extra PWHT cycle.

Study the contract documents, you may need to get approval of the repair and/or procedure first.

As AravindSujay said, you could also just fit a connection. Either way, approval may be required.

Regards,

Mike

 

[SnTMan]

I might have added that stainless formed heads are often spun-formed and will have a hole in the center. The head fabricator will weld-repair this hole, or not, if the center is to be cut out anyway, say as for a nozzle.

Regards,

Mike

 

[vesselfab]

very common on spun heads. If an opening is not being installed at that location, we just plug with a piece of compatible (same) material and full penetration weld with an approved WPS and fully radiograph the seam.

 

[jte]

It would help if you could mention what code of construction is being used for this vessel...

jt