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|  MIL-G-24477(SHIPS)
3.2.5.1.1 Taper pipe threads are permitted in the following areas:
(a) Pipe plugs in sizes of 3/4 inch and below used for applications where design
pressures do not exceed 50 p.s.i. Plugs shall be seal welded or brazed, if
possible.
Instrumentation, controls, vent, filling and drain connections where design
(b)
pressures do not exceed 50 p.s.i. and where fluids handled; (1) are not toxic,
(2) are not dangerous, (3) would not cause atmospheric contamination, (4)
would not create a fire hazard, and which would not cause, in the event of
failure, a major breakdown of equipment nor create a hazard to the surround-
ing area nor affect the operation of other vital equipment.
(c) Pipe plugs internal to the engine.
3.2.5.2 Cooling water system. Engines shall be designed to operate with a closed
fresh water cooling system in accordance with Drawing 5000-S4501-64492. Sea water piping
shall be of 70-30 copper nickel alloy. Fittings and valves shall be bronze. All parts of
the sea water system directly connected with the sea which could be subjected to submarine
submergence pressure shall be designed for a test pressure that will be furnished by the
contracting officer upon request. Such parts shall be given radiographic inspection as
specified by the contracting officer.
3.2.5.2.1 Cooling water pump. Fresh and sea water pumps shall be of the centrifugal
type driven by the engine with the drive arrangement designed to prevent water leakage into
the engine lubricating oil system. Where practical, the fresh and sea water pumps shall be
The pumps shall be so mounted or provided with a continuous vent to prevent
interchangeable.
the entrapment of air. A self-priming seawater pump shall be provided where pump lift re-
quirements demand such a pump. All pumps which are not self draining shall be provided with
petcocks or other means of draining completely without the use of special tools. Special
tools are defined as those tools not listed in the Federal Supply catalog (copies of this
catalog may be consulted in the office of the Defense Contract Administration Service (DCAS)) .
Engine manuals shall contain complete instructions covering draining of pumps. Seawater
pump volute and suction head shall be made of one of the following materials: composition M
in accordance with MIL-B-16541; alloy D5 in accordance with QQ-C-390; copper-nickel alloy
(70-30) in accordance with MIL-C-20159; or nickel aluminum bronze in accordance with MIL-B-
23921. Shaft seals for sea water pumps shall prevent any air irom leaking into the pumps
under a suction head of 15 inches of Hg. Sea water pumps shall deliver rated capacity when
operating under a discharge head of at least 35 p.s.i.
3.2.5.2.2 Heat exchangers. Fresh water/sea water heat exchangers shall conform to
type A, class 1 of MIL-C-15730.
3.2.5.2.3 Water temperature control. Temperature regulator valves and thermostatic
valve shall be either the fail safe type which will pass all the cooling water through the
cooler in the event of failure of the thermostatic element or be provided with a manual
"over-ride" for the thermostatic element.
Engines shall employ coolant inhibitors conforming to O-S-588
3.2.5.2.4 Inhibitors.
(chromate type).
3.2.5.2.5 Gaskets and packing. Gaskets and packing used in the cooling system shall
be of materials resistant to deterioration by sea water or when any of the following are
added to the fresh water system:
(a) Antifreeze compounds conforming to O-A-548.
(b) Corrosion inhibitor compounds conforming to O-S-588, MIL-I-24453 or 0-1-490.
(c) Preserv.ative compounds conforming to MIL-C-16173 and MIL-L-21260.
3.2.5.3 Fuel system. Engines shall be capable of operating on fuel corresponding to
both MIL-F-1684 or JP-5 of MIL-T-5624. The fuel system shall include the following:
Positive displacement type fuel pump.
(a)
Relief valve connected to discharge into pump suction or supply tank.
(b)
Priming pump.
(c)
Filters.
(d)
Necessary piping, valves and fittings.
(e)
3.2.5.3.1 If leak-off from the injectors and fuel pump exceeds 2 percent of the supply
pump capacity, necessary equipment shall be provided to automatically return leak-off fuel
to the service tank.
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