MIL-DTL-24231E(SH)
4.5.4 Hydrostatic pressure.
4.5.4.1 First article test. The pressure-proof fittings shall be tested in the configuration specified for the
applicable type (see 4.5.4.1.1 through 4.5.4.1.4). Cables or wires shall be protected to prevent water from entering
open ends. The fittings shall be subjected to the following pressure cycles:
Gauge pressure 0 to 100 pounds per square inch (lb/in2) for 5 minutes, cycle three times.
a.
Gauge pressure 0 to 2000 lb/in2, one cycle; 24-hour duration.
b.
4.5.4.1.1 Type I. The molded plug and cable shall be assembled with an applicable receptacle.
4.5.4.1.2 Type II. Unless otherwise specified (see 4.5.4.2), the completed adapter shall be tested in the
unmated condition (pins exposed to pressure side) and mated condition (mated with matching plug).
4.5.4.1.3 Type III and IV. Unless otherwise specified (see 4.5.4.2), the assembled (single or multiple) cable
connector shall be tested in the unmated (pins exposed to pressure side) and mated condition (mated with matching
plug).
4.5.4.1.4 Type V. The receptacle body shall be welded or secured in a test plate or pressure-proof enclosure for
testing purposes. Receptacles shall be tested to the same configuration as specified in 4.5.4.1.3.
4.5.4.2 Conformance test. Pressure-proof fittings shall be tested as specified in 4.5.4.1, except that the fittings
shall be tested in the unmated condition and the gauge pressure 0 to 2000 lb/in2 test shall be maintained for 2 hours
in lieu of 24 hours.
4.5.5 Hardness.
4.5.5.1 Brinell or rockwell. The Brinell or Rockwell hardness of each Ni-Cu-Al alloy connector and body
cover, body, body washer, body nut, and plug for hull insert shall be tested in accordance with ASTM E10 or
ASTM E18, as applicable. Unless otherwise specified (see 3.1), hardness shall be checked at three locations,
avoiding critical surfaces. Tests shall be considered as an indication of final material condition and shall be in
accordance with 3.5.5.1.
4.5.5.2 Durometer. Rubber packing shall be subjected to the Type A test specified in ASTM D2240 to
determine compliance with 3.5.5.2.
4.5.6 Bonding.
4.5.6.1 Nondestructive. The nondestructive bonding test (see figure 1) shall be conducted on sample plugs.
Evidence of poor bonding shall be cause for rejection (see 3.5.6).
4.5.6.2 Destructive. The destructive bonding test shall be conducted on one plug assembly in a fully cured
condition as determined by correct durometer and shall be tested as follows: With a sharp knife, make two cuts
(5/8 inch apart and 3 inches long) as shown on figure 2. Cut to metal surface and cable surface. Place a screwdriver
or spatula (minimum width of ¼ inch) approximately midway between the polyurethane surface and the metal
sleeve surface in one of the cuts as shown on figure 2. Pry back the polyurethane material in this manner until the
polyurethane breaks or the bond releases. Repeat this probing process along the 3-inch cut. If necessary, use pliers
to pull polyurethane compound during test. Cut pieces removed for adhesion test shall show no uncured compound
as determined by the hydrometer tests of both inside and outside surfaces. Any evidence of poor bonding between
polyurethane and exposed metal or cable shall be cause for rejection (see 3.5.6).
4.5.7 Underwater explosion. Single and multiple cable connectors shall be tested for underwater explosion
(see 3.5.7). Failure to pass this test shall be cause for rejection.
4.5.8 Operation. Each molded plug assembly shall be mated with a matching receptacle and each receptacle or
connector assembly shall be mated with matching plugs to ascertain proper fit. With each completed assembly
mated with its matching assembly, an electrical continuity test shall be conducted while the cable is flexed where it
enters the fitting to determine conformance to 3.5.8. The continuity test may be omitted where the cable for one of
the matching assemblies is received with a component (such as a hydrophone) molded to one end.
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