(Refer: Mandatory Appendix 8 (Page 417) of ASME BPVC Section VIII Div 1, 2017 Edition.)

The following terminologies have been used to explain the acceptance/rejection criteria for Liquid Penetrant Examination (PT).

Relevant Indications: Indications with major dimensions greater than 1.5 mm (1/16 in.) shall be considered relevant.

Linear Indication: Any indication with a length greater than three times the width.

Rounded Indication: Any indication with a length equal to or less than three times the width. A rounded indication may be of circular or elliptical shape.

Acceptance Criteria for Liquid Penetrant Examination (Mandatory Appendix 8):

All surfaces to be examined shall be free of:

(a) Relevant linear indications shall be rejected.

(b) Relevant rounded indications greater than 5 mm (3/16 in.) shall be rejected.

(c) Four or more relevant rounded indications in a line separated by 1.5 mm (1/16 in.) or less (edge to edge).

Please watch the video (given below) for more clarity on acceptance criteria for the Liquid Penetrant Test (LPT);

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