Supplementary coupon of PQR
Supplementary coupon of PQR
(OP)
Dear All,
I am having a PQR with PWHT performed on 33.32mm pipe A106 Gr.B (Without impact), can I make a additional test coupon of lower thickness say 12.70 mm with keeping all the essential variable same as earlier PQR. And on basis of these PQR and its supplementary coupon, WPS may get the total thickness range of 5.0mm to 66.64mm (With Impact).
I am having a PQR with PWHT performed on 33.32mm pipe A106 Gr.B (Without impact), can I make a additional test coupon of lower thickness say 12.70 mm with keeping all the essential variable same as earlier PQR. And on basis of these PQR and its supplementary coupon, WPS may get the total thickness range of 5.0mm to 66.64mm (With Impact).





RE: Supplementary coupon of PQR
RE: Supplementary coupon of PQR
RE: Supplementary coupon of PQR
So, I am confused and i am unable to get any reference which can give higher thickness with impact toughness (as per main PQR with the help of supplementary PQR).
RE: Supplementary coupon of PQR
RE: Supplementary coupon of PQR
RE: Supplementary coupon of PQR
RE: Supplementary coupon of PQR
In answer to your question a 12.7 mm impact tested coupon will qualify you to 25.4 mm max for ASME IX (impact or not impact tested) and for B31.3 it will qualify you to 25.4 mm (not impact tested) and 19.05 mm (impact tested).
Forget about ASME IX thickness ranges for a moment as B31.3 ranges take precedence.
Using the formula T/2 to T + 6.35 mm you should be able to work out how many coupons you require.
Cheers,
DD