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ASME B31.3, chapter 2, paragraph 306.3 states even under sever conditions miter angle less than 22.5 degree is permissible(It covers 5 degree angle).
Please note : in case that the flange is to be connected to a counter flange (to an equipment or another flange),miter joint shall not be pre fabrecated, rather, providing miter joint when it is connected to the counter flange before.
