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|  HIL-C-24604(SH)
4.6.12 Resin content determination. Resin content shall be
determined in accordance with FED-STD-406, method 7061. Samples for first
article inspection shall be taken from four locations on the cylinder:
one adjacent to the port fitting, one adjacent to the opposite or blind
fitting, and two approximately 180 degrees apart about the midpoint or
equator of the cylinder.
One sample from a fitting and one sample from
the midpoint shall be delaminated into at least two layers to determine
the resin content of inner and outer portions of the fiberglass wall.
For quality conformance sampling, two samples shall be taken from
approximately the same location on the cylinder wall.
The location shall
be adjacent to an end fitting on one sample unit and from the midpoint
of the cylinder on the other sample unit.
One of the samples shall be
delaminated into at least two layers.
Resin content shall be determined
for each solid and delaminated wall sample.
Moisture-barrier coating shall
be removed prior to testing.
Resin content shall be reported for all
samples.
Additionally, for samples that are delaminated, the average resin
content for the total wall thickness (fiberglass portion) shall be
reported.
It shall be calculated by averaging the values for the
delaminated samples, weighing the values according to the proportion of
the wall thickness each represents, or by combining the resin content for
the total wall thickness.
Minimum and average resin contents shall conform
to 3.2.4.
4.6,13
Void content. Void content determinations shall be made
on full-thickness (undelaminated) samples used for resin content tests
(see 4.6.12).
Tests shall be performed in accordance with the "percent
voids" test of MIL-P-17549.
In the event of nonconformance of any one
determination, additional samples may be taken adjacent to that sample
and the results averaged.
Void content shall meet requirements of 3.2.5.
4.6.14
Drop test. The cylinder shall be pressurized to 5000
and dropped a vertical distance of not less than 10 feet onto a rigid steel
plate twice in each of the three following configurations:
Impact on valve end of cylinder.
(a)
Impact on end opposite valve.
(b)
Impact on side of cylinder.
(c)
Subsequent to the drops, the cylinder shall meet the examination (see
4.6.2), extreme temperature leakage (see 4.6.3.2), thermal shock (see
4.6.5) and pressure storage (see 4.6.10) tests.
4.6.15
Pressure cycle test. The cylinder shall be pneumatically
pressurized to 5000
The cylinder shall be subjected to cyclic
pressure application at a rate not to exceed 10 c/m, from 5000
to
o, for 25 cycles.
4.7
Inspection of packaging. Sample packages and packs and the
inspection of the preservation-packaging , packing and marking for shipment
and storage shall be in accordance with the requirements of section 5.
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