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|  MIL-E-23457B(SHIPS)
4.4.2.2.4.2 A spectrometric analysis of each oil sample taken in accordance with
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4.4.2.2.4.1 shall be made. The concentration of elements in p/m of oil wetted wearing
parts shall be recorded. The analysis shall identify and measure the following elements,
as applicable, in p/m with the degree of accuracy indicated in 4.4.2.2.4.3: -
Iron (Fe).
(a)
Lead (Pb) .
(b)
Copper (Cu).
(c)
Chromium (Cr) .
(d)
Aluminum (Al) .
(e)
(f)
Nickel (Ni).
Silver (Ag).
(g)
Tin (Sri).
(h)
(i)
Silicon (Si).
Sodium (Na).
(j)
4.4.2.2.4.3 Degree of accuracy. Degree of accuracy shall be as follows:
#
Standard reference specimen
Standard deviation
(Range in p/m)
(Maximum in p/m)
3-9
1.5
10-19
2
20-49
3
50-99
5
100-199
8
200-500
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4.4.2.2.5 Lubricating oil analysis. Samples of the lubricating oil used during the
#
test shall be subjected to a laboratory analysis and the results included in the final
report. A sample shall be taken from the new oil before the test. Additional samples
shall be taken just prior to oil changes and at the end of the test.
4.4.2.2.5.1 The analysis shall consist of the following tests conducted in accordance
#
with the indicated ASTM test method:
Test
ASTM No.
Total acid number
D664
D664
Total base number
D189 or D524
Carbon residue
Sulphated ash
D874
Pentane and benzene insoluble
D893, procedure B
4.4.2.3 Fuel consumption. Fuel consumption tests of 1/4 hour duration with time
#
intervals between each run for stabilization of operating conditions, shall be made on
propulsion engines at 100, 90, 70, 50, and 30 percent rated-speed for each load of O, 40,
80, 100, and 110 percent of rated hp. If the engine cannot be operated continuously at
30 percent rated-speed, the lowest safe operating speed shall be substituted. For speeds
below rated-speed, 100 percent bhp shall be defined as maximum bhp which the engine can
carry safely and meet the exhaust emission limits of 3.8.6.2 with a clear exhaust. Fuel
consumption shall be corrected for the difference in high heat value of the fuel actually
used during the test and the standard 19,350 British thermal unit (Btu) per pound.
4.4.2.4 Cold starting. Engines shall be subjected to a cold starting test (see
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3.8.7.1). Prior the test, the engine shall have been shut-down for at least 12 hours.
Cold water at temperature not exceeding 35F shall be circulated through the engine for at
least 1 hour or until all parts of the engine are cooled to a uniform temperature. The
engine shall fire and continue operating within 10 seconds after starting mechanism is set
in operation. If cold starting aids are required, the identical starting equipment shall
be furnished as part of the package under the contract. The minimum quantity of air
2
expressed in ft3 of air at a gage pressure of 14.7 lb/in and 68F for the start shall be
determined.
4.4.2.5 Normal starting. Immediately following the cold starting test (see 4.4.2.4),
nine consecutive starts shall be made under normal ambient conditions. The average time
required to start the engine, and the minimum starting r/rein shall be determined. The
engine shall fire and continue operating within 5 seconds after the starting mechanism is
engaged.
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