Thread repair in studding outlet ASME BPVC VIII-1 1

[FoxRox]

Female threads in studding outlet got cross-threaded. Original threads are not salvageable.

It is a very large flange. Replacing is possible but only as a last resort. Repair would be preferred.

Does code have rules for how this can be repaired?

NBIC Part 3 has a section (S2.13.14.1) for repair of threaded openings, but I don't think this is applicable for blind-tapped flange bolt holes.

Would something like a heli-coil insert be allowed?

 

[TGS4]

We've dealt with this in the past. Threaded out a larger diameter, then designed a threaded-both-sides insert. It has worked for 15+ years. Not sure if this is covered by any standard.

 

[SnTMan]

Would something like a heli-coil insert be allowed?

Generally speaking, if a thing is not prohibited, it is permitted.

Regards.

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand

 

[r6155]

Diameter of the hole and material of the flange?

Regards

 

[r6155]

See ASME PCC-2 Repair of Pressure Equipment and Piping.

Regards

 

[FoxRox]

Thank you all kindly for the replies. ASME PCC-2 has an article specifically for this problem.