MIL-DTL-23020C
4.4.2 Hydrostatic test (see 3.9). The hydrostatic test shall be conducted in accordance with MIL-DTL-
915, except that under the water-tightness test procedure specified in MIL-DTL-915, the methods of
sealing and clamping the cable jacket shall be in accordance with the methods employed in the pressure
proof fittings designated herein for the individual types. When the applicable fitting employs an "O" ring to
seal around the cable core, the "O" ring shall not be installed during the hydrostatic test. The test shall be
made at the pressure and rate of leakage specified on the specification sheet for a period of 2 hours. If
the cable fails the hydrostatic test it shall be rejected. The sampling for this test shall be a 5-foot (1.5 m)
piece of each manufacturer's length. Retesting will be permitted only when, in the judgment of the
Government representative, the previous test was improperly conducted.
4.4.2.1 Fittings. Fittings for the hydrostatic test shall be in accordance with the drawings listed in
section 2 and as specified on the specification sheets.
4.5 Visual and mechanical examination. The diameters and out-of-roundness of the core and jacket
shall be monitored on a continuous production basis by a suitable technique which will provide the
diameter in two mutually perpendicular planes at any cross section. The dimensions shall be as specified
and out-of-roundness (the difference in diameter dimension is mutually perpendicular planes at any cross
section) shall not exceed 50 percent of the difference between the maximum and minimum diameters
specified. The results shall be permanently recorded by a two-pen strip chart recorder or by another
electronic or mechanical means to record the diameter variances as long as the contracting officer
approves of the method and the method sensitivity is equal to or better than the two-pen strip chart
method. The test data shall be furnished to the procuring activity under separate cover at the time of
cable shipment. Each recording shall be identified as to the reel of cable to which it applies, and each
recording shall be identified to within ± 2 feet (0.6 m) of the corresponding point on the cable being
measured. The dimensional recordings shall be individually identified as to:
a.
Contract.
b.
Cable type.
c.
Manufacturer.
d.
Footage of corresponding cable.
e.
Whether applicable to dielectric or jacket measurements.
f.
Calibration.
4.5.1 The technique used (including detector, recorder, and associated units) shall meet the
following:
a. Have a sensitivity to record accurately the cable diameter to the third decimal place 0.001
inch (0.02 mm) along the length of cable.
b. Have a response capable of accurately recording changes in diameter as specified in (a) at
the speed (feet/minute) of cable production. Deviation occurring on a length 0.060 inch (1.5
mm) or greater shall be discernible.
c. The strip chart recorder pen traverse shall be large enough to distinguish easily changes in
diameter of 0.001 inch (0.02 mm).
The ratio of cable production in feet/minute to chart travel in inches/minute shall be small enough to
permit ease in comparing the individual traces from the two pens. A 20:1 ratio shall be considered
maximum acceptable ratio.
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