Standard Practice for Eddy-Current Examination of Steel Tubular Products Using Magnetic Saturation
|Publication Date:||10 October 1995|
|ICS Code (Iron and steel pipes):||23.040.10|
|ICS Code (Steel pipes and tubes for specific use):||77.140.75|
1.1 This practice covers a procedure for applying the eddy-current method to detect discontinuities in ferromagnetic pipe and tubing (Note 1) where the article being examined is rendered substantially non-magnetic by the application of a concentrated, strong magnetic field in the region adjacent to the examining coil.
NOTE 1--For convenience, the term tube or tubular product will hereafter be used to refer to both pipe and tubing.
1.2 The procedure is specifically applicable to eddy-current examination methods using an encircling-coil assembly. However, eddy-current techniques that employ either fixed or rotating probe-coil assemblies may be used to either enhance discontinuity sensitivity on the large diameter tubular products or to maximize the response received from a particular type of discontinuity.
1.3 This practice is intended for use on tubular products having outside diameters from approximately ¼ to 10 in. (6.35 to 254.0 mm). These techniques have been used for smaller and larger sizes however, and may be specified upon contractural agreement between the purchaser and the supplier.