Q. Determine the extent of imperfection of the gasket surface?
To determine the extent of imperfection of the gasket surface subject to acceptance / rejection, the imperfection shall be compared by sight and feel with Standard Roughness Comparison Specimen (see ASME B46.1) for the gasket surface finish specified.
Within the criteria established above no pits, flaws, gouges, grooves or waviness visible to sight or feel are permitted on gasket surfaces.
Defects may be repaired by truing up with a file or refacing or other methods which achieve the standard above.
Field inspectors will accept or reject all flange surfaces according to the above criteria or will refer borderline cases for engineering assessment.