[MW:6799] wrong holes on header closed by welding-reg

Dear all, in our current job of prefurnace,holes(2 nos.on end of the both side of header) specified in the drawing was wrong.But it was found only after the holes were drilled. Specification of header pipe as follows. Material - A106 Gr.B Dia - 6" Thk. - 7.11mm Hole dia - 74 Design Pressure - 16bar MAWT - 190degree celsius After that,it was noticed to our engineering departmmment and they revised the drawing and asked our production to close the wrong holes by attach the same grade of material and weld.Now the repair has finished as said above. But on this hole closed area, we cannot do UT (because of thickness limitation) also RT cannot be done because of the adjacent tubes and elbows.Even we cannot see the penetration of the weld due to endplates were closed on both sides.just we did PT only and there is no defects. Pls.give your suggestion on the below questions.   01.The holes closed is a right method? 02.what will be the strength in future working conditions? 03.what will be the suitable inspection method at this condition? 04.finally ,can accept this or not?   Thanks & Regards,   (Karthik)   Karthikeyan.S QA/QC Manager Getabec Energy Co.,Ltd. 379,Moo6,Soi8,Nikhomphatana, Rayong-21180, Thailand. Phone: 0066 38 897035-8 (Off) Fax: 0066 38 897034 Hand Phone: 0066 892512282

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