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  1. arvindshakya

    Supplementary coupon of PQR

    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...

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