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[MW:32030] Welding symbol

By Materials & Welding

Dear all,
can you help me what are the problems with this welding symbol?
Details: the pipe outside diameter was 20" with a wall thickness of 1.5 inches thick. The architect wanted the welds to be ground flush on the outside surface, where as the field joints were to be made using permanent steel backing rings. The Engineer selected the following welding symbol for showing the field welds using a backing bar (ring).

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