MIL-DTL-60377C (AR)
3.5 Radiographic inspection.
3.5.1 Metal parts defects. There shall be no cracks,
pipes or thin wall sections in the projectile metal part.
There shall be no evidence of gaps, as defined by visual x-ray
standards, between the rotating band and its seat (see 6.3.)
3.5.2 Foreign material. There shall be no foreign
material in the explosive charge.
3.5.3 Base separation. The maximum allowable base
separation shall be 0.015 inch between the base of the
projectile cavity and the explosive charge.
3.5.4 Porosity (see 6.17.)
3.5.4.1 Shrink porosity. Shrink porosity within the
explosive charge shall not exceed the requirements specified in
Table I.
3.5.4.2 Spherical porosity. Spherical voids greater than
1/8 inch in diameter shall be considered as cavities. Spherical
pores less than 1/32 inch in diameter shall be disregarded.
Visual x-ray image standards illustrating acceptable levels of
spherical porosity shall be established for each line and
process see (6.3.) Areas of spherical porosity not exceeding
the standards shall be acceptable.
3.5.5 Projected cavities.
Cavities within the explosive
charge shall not exceed the requirements specified in Table I.
Cavities having a maximum projected length of 1/32 inch shall
be disregarded.
3.5.6 Piping (also known as core porosity). Piping within
the explosive charge shall not exceed the requirements
specified in Table I.
3.5.7 Cracked charges.
3.5.7.1 Width. The width of a transverse crack shall be
measured within 1/8 inch of where it intersects the projectile
body. If the width is not clearly measurable within 1/8 inch
of the body intersection or it does not extend to within 1/8
inch of the body intersection, that transverse crack shall be
considered to have met the width requirement of Table I. The
plane of a transverse crack shall appear to intersect both
projectile sidewalls, to include the base radius. Transverse
cracks which meet the width requirement shall be counted for
the sum requirement. All cracks, regardless of orientation,
shall meet the width requirement.
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