PQR qualification
PQR qualification
(OP)
We are qualifying a WPS to 1104 on 16" pipe 1" WT, the root was identified as exceeding the 1/16" root penetration, the welder used a nose rock to grind the 1/2" long area that exceeded the 1/16" allowance, is it acceptable to perform grinding on the root?





RE: PQR qualification
Can you please advise where the 1/16" allowance comes from ?
I have searched API 1104 and the only criteria I can find is 13.8.4 but that falls in Section 13 which is Automatic Welding without filler metal additions ??? Is that applicable to your situation ?
When qualifying a WPS/PQR the size of isolated excess reinforcement (both internal & external) is not considered critical because in most cases the reinforcement is removed and is not part of the test.
If you have widespread or total excess reinforcement on the root you have issues that need addressing ( possibly excess root gap, possibly insufficient root landing) and the WPS needs revision.
If you have isolated excess penetration then it is probably a welder issue and not a WPS issue.
In answer to your question:
IMHO - if it is WPS qualification there is no problem with grinding the excess internal penetration.
IMHO - if it is Welder Qualification you are not allowed to touch the excess internal penetration.
Regards,
DD
RE: PQR qualification
Not sure why that was performed as this was done for a PQR and the specimens would have been ground anyway.
RE: PQR qualification
RE: PQR qualification
Section 7.8.2 is titled Filler and Finish beads - this section is related to the capping run on the exterior of the pipe, nothing to do with root runs.
Jusplayn31,
Politely ask your French welding engineer to assist you with compiling your NCR - what is the basis for the NCR ?
Good luck,
DD
RE: PQR qualification
Fully aware of this as I am a contributer to this specification.
RE: PQR qualification
My initial thought is that the qualifying spec should govern the WPS qualification and the NDE acceptance for grading the weld would be to the more stringent B31.1 acceptance criteria.,.,?
RE: PQR qualification
You mention B31.1 twice and B31.3 once (as well as Severe Cyclic) - is this your typing error or more confusion from the client ?
Just to assist a little - Acceptance Criteria for maximum internal protusion (reinforcement) on 1" (25 mm) WT in accordance with B31.3 Severe Cyclic is less than or equal to 4 mm.
Cheers,
DD
RE: PQR qualification
RE: PQR qualification
Regarding the whole welding, there is no reason to perform grinding neither on the root nor on the cap since the dimensions on the sketch of the "sample procedure specification form" are for example only as clarified by the form's note. Regarding the excess reinforcements of the test specimens, for the tensile and nick-break tests the API 1104 recommendation is no grinding whereas the grinding is mandatory for the bend tests specimens. Please have a look at this link:
http://www.weldinguide.com/gdanastasiadis/viewtopi...
regards
wegm