Hydrostatic pressure test of a vessel part

[tanks a lot]

I have an ASME part (U2) being fabricated. It is a change in materials and thickness from the original. The part will be welded to the existing Pressure Vessel in the field by an R-stamp organization. The work on the vessel as a whole will be an alteration.

Does the part manufacturer need to hydro test the part per ASME Section VIII Div 1?

Assume the new part is flanged and bolts up to an existing vessel. It is considered an alteration due to the new flanged part being a different material/thickness. There is no welding in the field. Does the part need to be hydro tested by the part manufacturer?

In both cases, if the part manufacturer is not responsible for the hydro test, who would be responsible for the integrity of the part should it fail in the field.

 

[LittleInch]

Errr first you said it's welded then you say it's flanged.

Which is it?

If it's flanged then for sure the vendor pressure tests it.

Welded is a bit more difficult as he needs to weld on some test end then cut it off again.

Personally that's what I would do but you could just test the vessel and new part.

You will need to test it whatever.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[SnTMan]

Regarding Sec VIII, Div 1, I don't believe there is any requirement to hydro parts, I believe it is instead a contractual matter.

Regards,

Mike

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

 

[tanks a lot]

Thanks for the replies. It’s 2 hypothetical scenarios, 1 is welded, the other is flanged/bolted.

I agree with SnTMan. I do not see anything in section VIII div 1 requiring a pressure test of the part. I am assuming that any pressure testing would be by agreement with the purchaser or per NBIC part 3 during installation in the field.

 

[david339933]

UG-120(C)(1)(-b): The parts manufacturer shall indicate in the remarks the extent he has performed any or all of the design functions.

 

[r6155]

See ASME PCC-2 Article 301- This is a "modification"
It depends on the situations, instead of hydrostatic test or alternative NDE of a new part, you can use acoustic emission test during commissioning.

Regards