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This document is intended for the application of AT on metallic pressure equipment during controlled loading. Therefore the overall aims of this document are: — to detect, locate and grade areas with evolving imperfections; — to provide the manufacturer the possibility to compare results of the first test with those of subsequent periodic inspections; — to determine the possibilities and limits of AE testing (AT) for pressure equipment; — to establish common basis for procedures to perform AT, taking into account the specific characteristics of the equipment under test; — to define the criteria, features and grades essential for evaluation of test results; — to suggest follow-ups to the test.