This standard defines a flowchart procedure, see Annex A, which is devoted to the classification of internal indications as planar or non-planar.
This standard is only suitable for indications located at least 5 mm below the unground surface of the joint, see Figure 1.
BS EN 1713:1998 history
2017BS EN ISO 23279:2017 Non-destructive testing of welds. Ultrasonic testing. Characterization of discontinuities in welds
2010BS EN ISO 23279:2010 Non-destructive testing of welds - Ultrasonic testing - Characterization of indications in welds
1998BS EN 1713:1998 Non-destructive testing of welds - Ultrasonic testing - Characterization of indications in welds