Monday, May 26, 2008

[MW:796] Re: Dissimilar Group number/Thickness combination PQR as per QW403.5/QW403.6

As per the above PQR P1 Gr1 QUALIFIED  1.5mm to 12mm and PQR P1 Gr 2 QUALIFIED 5 TO 18.34mm ( ASME B 31.3 ) , SO Y ou can not weld P1 Gr 2 below 5 mm.You can  weld P1 Gr1 up to 19 mm ( because of above 19 mm PWHT REQUERED ,it is not clear.)

  

 

BABU.P.R 

--- On Mon, 5/26/08, Bathula Raghuram (Mumbai - PIPING) <R.Bathula@ticb.com> wrote:

From: Bathula Raghuram (Mumbai - PIPING) <R.Bathula@ticb.com>
Subject: [MW:795] Dissimilar Group number/Thickness combination PQR as per QW403.5/QW403.6
To: materials-welding@googlegroups.com
Date: Monday, May 26, 2008, 11:19 AM

When Impact testing of HAZ is required by design, welding as per ASME SecIX

 

One of PQR qualified with a combination of group number and thickness welded together as 516 Gr60- 6mm thk and 516 Gr 70- 12mm thk

WPS prepared for the range of 6-24mm for both group numbers. (QW403.6)

 

In my opinion it virtually qualifies for nothing (except for 12mm thick) for a combination of group numbers

 

For E.g. I have nozzle SA333 Gr6 and WNRF flange SA350LF2 with thickness of 7.11mm

 

Where as in the above PQR, P#1, Gr#1 qualification range is 6-12mm and P#1, Gr#2 qualification range is 12-24mm and (QW403.5 and 403.6)

 

Please share your views, do my views justified by the correct interpretation of QW403.5 and 403.6?

 



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