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|  MIL-T-18404(NOrd)
at 0.1 to 0.5 grams per cubic foot within the test space. The relative
humidity shall not exceed 30 percent at any time during the test. Sand and
dust used in the test shall be of angular structure and shall have character-
istics as follows :
(a) 100 percent of the sand and dust shall pass through a 100-mesh
screen, U. S. Standard Sieve Series.
(b) 98 2 percent of the sand and dust shall pass through a 140-mesh
screen, U. S. Standard Sieve Series.
(c) 90
2 percent of the sand and dust shall pass through a 200-mesh
screen, U. S. Standard Sieve Series.
2 percent of the sand and dust shall pass through a 325-mesh
(d) 75
screen, U. S. Standard Sieve Series.
(e) Chemical analysis of the dust shall be as follow:
Substance
Percent by Weight
0 to 2
0 to 1
0 to 2
0 to 1
0 to 2
Other materials
The Internal temperature of the test chamber shall be maintained at
for a period of 6 hours
1/2 hour with wind velocity through the test chamber
in the vicinity of the torpedo of not less than 200 feet per minute. After 6
hours at the above conditions, the temperature shall be raised to and main-
tained at 130%.
5%. These conditions shall be maintained for 6 hours
1/2 hour l At the end of this test period, the torpedo shall be removed and
allowed to cool to room temperature and perf ormance checked.
4.4.8 Tropical environment. - The tropical enviromnental tests on the
torpedo shall be made with all accesss covers removed. Drying or wiping prior
to performance checking shall not be done.
4.4.8.1 Torpedo non-operating or ready non -ope rating. - The torpedo,
including applicable external connections , shall be placed in a mold chamber
maintaining an internal temperature of 86%'.
and a relative humidity
of 90 percent
5 percent and sprayed with the suspension of mixed spores.
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