MIL-DTL-917F(SH)
3.15.1.2.3 Hoses, fittings, and piping systems. Designs for piping systems using flexible hose assemblies shall
consider S6430-AE-TED-010 for such systems.
3.15.1.2.3.1 Teflon hose. Teflon hose and hose assemblies shall be in accordance with MIL-H-24592.
3.15.1.2.3.2 Clamps. Hose clamps shall not be used.
3.15.1.2.3.3 Piping and fittings. Piping, fittings, and valves of the cooling system shall be in accordance with
MIL-STD-438 and MIL-STD-777.
3.15.1.2.4 Heat exchangers. Heat exchangers shall be located so that water from leaks and condensation will
not fall on electrical circuitry. Drains shall be provided at the bottom of enclosure for removal of this water. Heat
exchangers shall be easily removable without removal of or damage to adjacent parts or electrical circuitry and shall
be in accordance with MIL-C-15730.
3.15.1.2.5 Direct cooling of electrical components. The preferred water source for direct cooling of electrical
components shall be the Electronics and Auxiliary Fresh Water (EAFW) system on submersible vessels and the
Electronic Cooling Water (ECW) systems on surface ships whose characteristics (pressure and temperature) shall be
in accordance with DOD-STD-1399-532. All other fresh water sources including machinery fresh water (MFW),
diesel fresh water (DFW), chilled water (CW), and potable water (PW) on surface ships, and engine room fresh
water (ERFW), propulsion plant fresh water (PPFW), and chilled water (CW) on submersible vessels used for direct
cooling of electrical components shall require:
a. Deionization systems which are self-contained with purification equipment, purity sensors, and alarm
systems.
b. Imposed electric potential differences between metal surfaces in contact with non-deionized cooling water
is prohibited.
c. Direct cooling with insulating oil shall require that the insulating oil used for heat exchanges be
self-contained with purification equipment. Oil characteristics should be in accordance with SAE-AMS-H-81829.
3.16 Mechanical features.
3.16.1 Castings. Equipment may include cast or fabricated construction. Guidance for castings can be found
in MIL-HDBK-454.
3.16.2 Panel-mounted parts. Protection for panel-mounted parts may be accomplished by the use of auxiliary
sealing devices in accordance with MIL-DTL-5423.
3.16.3 Fastening devices. Panels, covers, and access doors shall be secured to the equipment by means of
fastening devices such as captive bolts or screws, draw bolts, trunk fasteners, dogs, levers, and latches in order to
provide quick and easy access to the interior.
3.16.4 Handles and control knobs. Handles and control knobs shall conform to the requirements of the
individual equipment specification. When a specification does not include requirements for control knobs, they
shall be selected from NASM3926. Handles and control knobs shall be firmly secured to the control shafts by the
use of setscrews, for which the setscrew contact to the shaft is a flat surface.
3.16.5 Metallic inserts. Metallic inserts for the securing of screws or studs shall be held in the base material so
that they will not rotate when the screws or nuts are tightened or loosened. Staking as a means of securing the
inserts shall not be permitted (see 3.2.24.5).
3.16.6 Pins. Pins or slotted tubular spring pins and inserts shall be of austenitic corrosion-resistant steel,
nickel-copper alloy, or another corrosion-resistant alloy so that corrosion does not occur and affect disassembly.
When a non-magnetic material is required, austenitic corrosion-resistant steel shall be used. If the pin is
galvanically incompatible with mating insert (see MIL-STD-889), the pins should be coated with an anti-seize or
sealant compound that will reduce corrosion and seizing.
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