Dear all,

I encounter a problem to translate a paragraph included in QW420 as below into my language, can you be kindly and help me interpret it by using several simple english sentences?

"Procedure and performance qualifications that were qualified under the previous P- or S-Numbers or Group Number assignment may continue to be used under the new P-Number or Group Number assignment, see QW-200.2(c), provided the WPS is revised to limit the materials qualified for welding to those assigned to the new P- or S-number(s) and Group number(s) for the specific material(s) originally used for the procedure qualification test coupon. Other materials from the original P- or S-Number and Group Number must be reassigned to the same P- or S-Number or Group Number to be considered qualified for welding under the revised WPS."

Thank you very much

Allen

_________________
Know-Nothing...

Allen,

See below,

Part:
Subject:
Redesignating S-Numbers as P-Numbers
Description:
This revision reassigns all the existing S-Number materials in Table QW/QB-422 as P-Number materials for welding and brazing procedure qualification purposes and deletes all reference to S-Numbers from appropriate paragraphs of Section IX.

P-Numbers are assigned to ASME materials to reduce the number of welding and brazing procedure qualifications required of Certificate holders. A number of years ago the issue of reducing the number of qualification tests required for welding/brazing non-ASME materials used in the B31 Code for Pressure Piping and selected BPVC Code Cases was raised. Rather than anoint those materials with P-Numbers, the decision was made to assign a new designation “S-Numbers” to these materials. Since 1989 Subcommittee IX has been assigning S-Numbers to mostly ASTM materials the B31 Code and BPVC Code Cases.

Since the criteria for both P-Numbers and S-Numbers are based on chemical composition, mechanical properties, weldability and brazeability, Subcommittee IX has questioned the need for separating ASME and non-ASME materials into P- and S-Numbers. The assignment of a material as a P-Number (rather than an S-Number) rests solely on whether or not the base material has design allowable stress values in Section II Part D or B31. The reality is that whether or not a base material has design allowable stresses does not alter the welding characteristics of that material. With this basis in mind, it was decided to delete the S-Numbers and classify all weldable materials identified for use in pressure retaining or component support construction, regardless of material specification, with P-Numbers.


leem817

Leem817,

Provided:

Material A,B, C and D are assigned to P-no. 1, according to Section IX 2007, and I coducted a WPQR test useing material A, so material B, C and D can be covered by this WPQR as per 2007 edition of ASME Section IX ;

But in 2010 edition, material A was reassigned to P-no.2(including material E F G).

Question:

If I continue to use that WPQR tested according to 2007 edition (QW420 states this use is allowed), which P-no.above can be covered? P-no.1, Material B,C and D, or P-no.2, material E,F and G?

Can you help and give me a detailed interpretation for this question?

Thanks very much.

Allen

_________________
Know-Nothing...

Dear, All,

Can anyone help to answer me to the question as above?

Thanks very much.

_________________
Know-Nothing...