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Writing a WPS / PQR

Writing a WPS / PQR

Writing a WPS / PQR

When writing a WPS / PQR will the P-Number that is use for the WPS / PQR cover all groups and alloys under that P-Number or do we have to write seperate WPS /PQR's for each group and alloy. Ex. P44 covers Hastelloy B2, C22, C276. Can we write P44 To P44 and cover all these alloys.

RE: Writing a WPS / PQR

A PQR qualified with a P44 material will support WPS's for other P44 materials as long as the other essential variables are satisfied.

RE: Writing a WPS / PQR

So as long as our Filler materials are the same throught the welding process of the P44 even though our P44 materials change we should be covered

RE: Writing a WPS / PQR

This appears to be an ASME IX question, but a change in filler metal F#, or A# is an essential variable. Same for a change in P#, or any other essential or supplementary essential variable.

RE: Writing a WPS / PQR

Per ASME IX, C276 is in group P43.

RE: Writing a WPS / PQR

IIRC, P43 is a 'gimmie' from P44. Worth researching.

RE: Writing a WPS / PQR

Many nickel-chrome-moly alloys were listed in both P43 and P44 (which included nickel - moly alloys). About 15 years ago the ASME Code placed the ni-cr-mo alloys listed under P44 into P43 where they belonged leaving the ni-mo alloys in P44.

RE: Writing a WPS / PQR


Can somebody help me

It is possible the weldability between P-No 1 (API 5L-pipe) to P-No 15E (WP91-elbow) ??

Tanks in advance.

RE: Writing a WPS / PQR

Possible, but not recommended. Especially without a lot of experience with P-No. 15E materials.

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