(Refer Mandatory Appendix 6 (Page 412) of ASME BPVC Section VIII Div 1, 2017 Edition. Acceptance criteria are the same as that of Liquid Penetrant Examination)
The following terminologies have been used to explain the acceptance/rejection criteria for Magnetic Particle Test (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 Magnetic Particle Examination (Mandatory Appendix 6):
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).