[MW:4648] Multiple PQRs for Impact test requirement

 

Hi Members,

 

Please provide a solution for the following issue.

 

Shell Material : SA 516 Gr.70 -- 50 mm Thk

Nozzle : SA 333 Gr.6 --- 7 mm thk

 

MDMT : - 46 Deg.C

 

I need to weld the nozzle to shell. I have a PQR with SMAW process qualified in 40 mm thk and another PQR with SMAW qualified in 6 mm thk.

 

As per Sec. IX if impact test is required the 40 mm PQR will support from 16 mm to 200 mm. base metal Thk. and the other PQR will support from 6 mm to 12 mm thk.

 

If I club these PQR can I write a WPS to support 6 mm to 200 mm?.

Is there any issue for the missing range of qualification between 12 mm to 16 mm?.

Or is it required to add another PQR to fill the missing thickness range from 12 to 16 mm between the first two PQRs?.

Or can I write a WPS directly with range 5mm to 200mm omiting impact test requirement for this joint as it is a category D joint and excempted from Production Test Coupon?.

Thanks & Regards
Muhammed Ibrahim PK

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