[MW:14370] Re [MW 14364] Welder qualification of Lower diameter

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