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|  MIL-G-24477(SHIPS)
3.2 ENGINE REQUIREMENTS
3.2.1 Engine rating. The engine h.p rating and speed shall be indicated on the
engine identification plate (see 3.2.7.1). This rated h.p.output corresponds to full
power rating of the generator set. This engine rated hp. shall be not greater than the
hp. value chosen as the 100 percent "rated load" condition for the first unit endurance
test specified in 4.5.2.
3.2.1.1 It is the intent of this specification to permit procurement of current pro-
duction engine models with a demonstrated background of service experience. In addition
to meeting all other requirements of this specification that are applied by the procurement
document, a production engine at the time of the bid must have met at least one of the
following requirements:
(a) The engine is essentially identical to an engine which has been used in
Naval service at the same or a higher power rating and brake mean effective
pressure (bmep).
(b) The engine shall be a type which the manufacturer will certify and has a
background of 5000 hours operation on at least one unit. The unit or units
considered as verifying this experience factor shall be installed for a
rated output at least equal to the rating specified in the procurement
involved. The engine supplier shall on specific request, provide detailed
information as to where the units are located, who operates them, and
insofar as practical, how they are used. This information shall be used
when desired to verify the manufacturer's stated compliance with this
experience requirement.
3.2.2 Materials Corrosion resistant materials shall be used in salt water system
piping and components. Coated or painted cast iron or other ferrous metals are not
acceptable in these areas.
3.2.2.1 Dissimilar metals. Contact between dissimilar metals shall be avoided in
order to minimize galvanic corrsion. An interposing material which will minimize or
eliminate this galvanic effect may be used.
3.2.2.2 Aluminum parts. Aluminum parts, other than pistons, blowers and fuel pumps
shall be protected from corrosion by one of the following methods:
(a) Exterior parts to be painted shall be anodized or treated with corrosion
resistant chemical film.
(b) Exterior parts to be left unpainted shall be anodized.
(c) Interior parts in contact with oil do not require treatment.
(d) Inferior parts not in contact with oil shall be anodized or treated with
corrosion resistant chemical film.
3.2.2.3 Threaded holes in aluminum intended for bolts or screws for components or
accessories normally removed or disassembled during routine maintenance or examination
shall have steel inserts. Where insufficient basic metal exists, studs can be used without
inserts. Dimension, including thread data and length, and complete instructions covering
the removal and replacement of all inserts used shall be included in the engine instruction
manual.
3.2.2.4 Magnesium alloys.
Magnesium alloys shall not be used.
3.2.2.5 Coatings.
No paint, plastic or zinc coatings shall be applied to the interior
of gear covers, lubricating oil sumps or any other interior surface that will be in contact
with lubricating, fuel, or hydraulic oils.
3.2.3 Design.
3.2.3.1 Standard operating condition. The following operating conditions shall be
used for the de-d testing of the engine and accessories:
Ambient air temperatures
. .. . . .
.
.
.
100F.
Barometric air pressure (dry) inches mercury (Hg) . .
.
.
.
29.92
160F.
Fresh water from engine (minimum) to 185F. (maximum)
.
.
.
3 p.s.i.
Exhaust back pressure . . . . . . . . . . . . . . . .
.
.
.
90F.
Sea water inlet temperature . . . . . . . . . . . . .
.
.
.
Sea water outlet temperature (maximum) . . . . . . .
.
.
.
130F.
160F. (minimum)
Lubricating oil temperature from engine . . . . . . .
.
.
.
to 190F. (maximum)
Intake air pressure . . . . . . . . . . . . . . . . . . . .
1 inch Hg. (vacuum)
8
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