APPENDIX 9 — MANDATORY
NONDESTRUCTIVE EXAMINATION
ARTICLE 9-1
MAGNETIC PARTICLE EXAMINATION
9-100 SCOPE
(a) This Appendix provides procedures which shall
be followed whenever magnetic particle examination
is specified in this Division.
(b) Article 7 of Section V shall be applied for the
detail requirements in methods and procedures, and the
additional requirements specified within this Appendix.
(c) Magnetic particle examination shall be performed
in accordance with a written procedure certified by the
Manufacturer to be in accordance with the requirements
of T-150 of Section V.
9-110 CERTIFICATION OF
COMPETENCE OF
NONDESTRUCTIVE EXAMINER
Personnel conducting the magnetic particle examina-
tion shall be qualified in accordance with AI-311.
9-120 EVALUATION OF INDICATIONS
Indications will be revealed by retention of magnetic
particles. All such indications are not necessarily imper-
fections, however, since excessive surface roughness,
magnetic permeability variations (such as at the edge
of heat affected zones), etc., may produce similar
indications.
An indication is the evidence of a mechanical imper-
fection. Only indications which have any dimension
greater than
1
⁄
16
in. (1.6 mm) shall be considered
relevant.
(a) A linear indication is one having a length greater
than three times the width.
425
(b) A rounded indication is one of circular or elliptical
shape with a length equal to or less than three times
its width.
9-130 ACCEPTANCE STANDARDS
These acceptance standards shall apply unless other
more restrictive standards are specified for specific
materials or applications within this Division.
All surfaces to be examined shall be free of:
(a) relevant linear indications;
(b) relevant rounded indications greater than
3
⁄
16
in.
(4.8 mm);
(c) four or more relevant rounded indications in a
line separated by
1
⁄
16
in. (1.6 mm) or less, edge-to-edge.
9-140 REPAIR REQUIREMENTS
Unacceptable imperfections shall be removed and
reexamination made to assure complete removal. When-
ever an imperfection is removed by chipping or grinding
and subsequent repair by welding is not required, the
excavated area shall be blended into the surrounding
surface so as to avoid sharp notches, crevices, or
corners. Where welding is required after removal of
an imperfection, the area shall be cleaned and welding
performed in accordance with a qualified welding pro-
cedure.
9-140.1 Treatment of Indications Believed Nonrele-
vant. Any indication which is believed to be nonrelevant
shall be regarded as an imperfection unless it is shown
by reexamination by the same method or by the use
of other nondestructive methods and/ or by surface
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