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[MW:26399] Radiography requirement of Annular Plate butt welded joint of the Tank / API 653/650

By Materials & Welding


Dear Experts,

Tank Material - Group 1
Diameter of Tank - 15 meters

Inspection Recommendation - Replacement of Annular Plate wherever thickness loss observed. Mostly 70% Area will be replaced. Currently the Full Bottom Plate replacement is not feasible. 

Configuration of Weld Joint - Single Butt welded joint with backing strip for the Annular Plate joint.

Query 1: Whether Radiography will be required for the butt welded joint as per API 650, Section 8.1.2.9? 
Query 2: If RT will be required and if it is not possible, whether UT can be taken.

Hope to see the response with respect to Code and request specific answer against both the queries.

Thank you
Regards, Vino




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