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Contact SupplierThe weld neck flange is normally referred to as " high Hub" flange. It is designed to transfer stresses to the pipe, thereby reducing high stress concentrations at the base of the flange. The pressure tappings are provided through the flangewhich arte at a distance of 1" from the face of the plate (shown in the drawing attached). Weld neck flanges are prefered where radiography on welding is involved.