This International Standard specifies require-ments for magnetic particle inspection of the tube body of seamless and welded steel tubes for pressure purposes, for the detection of surface imperfections, according to four different acceptance levels.

It is intended that this International Standard be used to detect surface imperfections on all or part of the outer surface of tubes, excluding the end/bevel face, as may be required by the relevant products stan-dards. However, it may be applied to the inside surface over a limited length from the ends of tubes, dependent on the tube diameter, by agreement between the purchaser and manufacturer.

In addition, this International Standard may be used, as appropriate, to locate the position of external surface imperfections, detected by another non-destructive testing method, for example, ultrasonics, prior to dressing of the tube surface, and to ensure complete removal of the imperfection after dressing is complete.