MPT Mandatory Appendix 6

6-1  –  6-5

 ASME BPVC.VIII.1-2015

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MANDATORY APPENDIX 6 METHODS FOR MAGNETIC PARTICLE EXAMINATION (MT) 6-1 61

SCOP SC OPE E

(a) This Appendix provides for procedures which shall (a) This be followed whenever magnetic particle examination is specified in this Division. (b) Arti Article cle 7 of Secti Section on V shall be applie applied d for the detai detaill requirements in methods and procedures, and the additional requirements specified within this Appendix. (c)  Magnetic particle examination shall be performed (c) Magnetic in accordance with a written procedure, certified by the Manufacturer to be in accordance with the requirements of T‐150 of Section V. (d) Documentation showing that the required examina(d) Documentation tions have been performed and that the results are acceptable shall be made available to the Inspector.

An indication of an imperfection may be larger than the imperfection that causes it; however, the size of the indication is the basis for acceptance evaluation. Only indications which have any dimension greater than 1/16 in. (1.5 mm) shall be considered relevant. (a) A (a)  A linear indication is one having a length greater than three times the width. (b) A (b)  A rounded indication is one of circular or elliptical shape with a length equal to or less than three times its width. (c) Any (c)  Any quest questionabl ionable e or doubt doubtful ful indications indications shall be reexamined to determine whether or not they are relevant.

6-4

ACCEPTA ACCE PTANCE NCE STA STANDAR NDARDS DS

These acceptance standards shall apply unless other

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