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|  MIL-E-23457B(SHIPS)
3.8.2 Cooling water system. Engines shall operate with a closed fresh water cooling
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system in accordance with Drawing 5000-S4501-64492. Sea water piping shall be of 90-10
copper-nickel alloy. Fittings and valves shall be bronze.
3.8.2.1 Cooling water pumps. Fresh and sea water pumps shall be of the centrifugal
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type driven by the
drive arrangement capable of preventing water leakage
into the engine lubricating oil system. Where practical, the fresh and sea water pumps shall
be interchangeable. Pumps for direct reversing engines shall be capable of operating in
either direction. The pumps shall be so mounted or provided with a continuous vent to
prevent the entrapment of air. A self-priming sea water pump shall be provided where pump
lift requirements demand such a pump. 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.
Sea water pumps shall be constructed of noncorrosive materials compatible with sea water.
The use of cast iron in contact with sea water is not acceptable. Shaft seals for sea water
pumps shall prevent any air from leaking into the pumps under a suction head of 15 inches
of Hg.
3.8.2.2 Engine fluid coolers. The coolers specified in 3.8.2.3, 3.8.2.4 and 3.8.4.2
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shall conform to MIL-C-15730 or shall be a commercial unit meeting the material and con-
struction requirements of 3.8.2.2.1 and 3.8.2.2.2. When high-shock resistance is specified
(see 6.2.1), coolers shall be in accordance with MIL-C-15730.
3.8.2.2.1 Materials.
Commercial cooler materials shall be as specified in tables I
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and II, except 70-30 copper-nickel alloy may be used where 90-10 is specified. The manu-
facturer shall have the option of substituting commercial material having equal or better
physical and chemical properties than the materials specified in the applicable documents
listed in tables I and II.
It shall be the responsibility of the engine manufacturer to
satisfy the cognizant DCAS that this is the case.
Table I
Salt water coolant.
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10
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