repair of distortion damage on nozzle and pipe 3

[FernandoL]

Hello, colleagues

Due to an accident during the transport of a pressure vessel, a nozzle was impacted which resulted in the bending of the tube located between the flange and the shell of this vessel.

Does the ASME code allow the alignment of this nozzle to be restored through the use of heat and the application of mechanical force?

Is there an angular limit beyond which such correction is no longer permitted?

I didn't find anything about it either in the ASME code or in the NBIC.

Any help will be very useful.

All the best,

Fernando

 

[AppletonBowen]

Morning Fernando,

It is always useful to specify what 'ASME Code' you are using, and what the classifcation of vessel is, as this can often dictate the appropriate course of action. ASME BPVC Sec VIII Div 1 certainly allows for repair work to be carried out, subject to appropriate validation of the repairs.

In my opinion, I believe this would be subject to agreement between the vendor and purchaser. If I was looking to undertake this work, I would first perform a combination of UT and DPI to prove the material was not invisibly damaged, and then rework to a proven procedure, followed by a further inspection and pressure test (as per original construction plan).

This would, of course, have to all be documented and informed/approved by the purchaser. In my experience, this is where you will experience most difficulty - ask yourself: if I were purchasing this equipment, would I accept a repair of this nature? Would you expect the damaged nozzle is removed and replaced?

I believe a lot of repairs of this nature fall under UG-78 Repair of Defects in Materials. 'Defects in material may be repaired, provided acceptance by the Inspector is first obtained for the method and extent of repairs. Defective material that cannot be satisfactorily repaired shall be rejected'.

Ask your AIA, or if you are not stamped, you should raise the issue with the purchaser, and be prepared to produce adequate documentation in line with UG-93 etc.

Rob

 

[r6155]

Don't you think a photo can be better to help you?

Regards

 

[MJCronin]

Also, do you have a vessel datasheet or design drawings for the vessel that you can post ?

Is this vessel new or used ???

MJCronin
Sr. Process Engineer