Re: [MW:14448] Re [MW 14364] Welder qualification of Lower diameter

Dear Paul,

in your case  your welder can weld'' OD pipe because as per code of ASME

1. QW-452.1(b) , for any thickness qualification range is 2T.

if your coupon is 13 mm or over and welder welded that coupon in more than three layers than he can weld unlimited under respective WPS.

2.as per QW-452.3 for pipe over 73 mm oD he can weld from 73 mm to unlimited  so if you qualified at 3.5 " he can weld from 73 mm OD to unlimited.

3.for qualification purposes 150 mm of weld length shall be volumetric ally tested as a minimum but note that this criteria is only for plate , if you are going to qualify on pipe full length of that diameter of pipe shall be volumetrically tested .

4. now regarding you ND doubt. after successful qualification of your welded the percentage of radiography is decide by the respective code of construction as per Joint category selection .

that will nothing to do with 10% , 20% or any percentage criteria.

hope full filling your requirements. 

On Mon, May 28, 2012 at 2:59 PM, jaffar ali riyas mohamed nizamin <jaffarqc1987@gmail.com> wrote:

Dear peter paul,

                 

According to this, the welder should qualified above 2.5"(inch)O.D.... He should weld (qualified) upto unlimited outer dia of pipe.(O.D).But it should be differ from thickness of pipe.....

 

Thanks & Regards

M.Riyas

 

On Mon, May 28, 2012 at 5:15 AM, Peter Paul <paul@rigresources.com> wrote:

Dear Expert,

 

Please advise me (clear my doubt) if my 6G Welder can carry-out the work with the following info . My welder qualification is at 3.5" (OD)[WT=12.7mm]. While the actual work is 4"OD [WT=8.56 mm(Sch 80)].

 

I will allow my welder to carry-out welding with the concession of monitoring his progress by NDT-RT. How often do I take RT? (is it 10% of his weld joint as per BS and ASME std?) Please revert and advise. Thank you!

 

 

Respectfully yours,

Peter Paul

 

+65 9939 5904

 

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Regards
Ansari Intekhab Alam

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