MIL-DTL-83054C
establish the effective porosity. For types II, III, IV and V material, porosity specimens shall be taken
directly above and below the retention specimens and tested as specified (see 4.6.4). All retention and
porosity (air pressure drop) specimens shall be properly labeled on the top surface and submitted to the
qualifying activity if requested. One fuel retention specimen shall be tested in accordance with the
following procedure, and all applicable data shall be recorded:
a. The specimen shall be preconditioned at a temperature of 75° +5°F (23.9° +2.8°C) for a
minimum of 30 minutes, weighted to the nearest 0.1 gram, and the dimensions measured in
accordance with ASTM-D3574. The grade JP-5 test fluid shall be prefiltered through a 0.8-micron
filter as specified (see 4.6.15) and then adequately preconditioned at the test temperature. Just
prior to use, the fluid shall be tested for specific gravity (density') and temperature.
b. The retention test apparatus shall be sized to approximately 7x7x10 inches and shall have a
means of draining the fuel from the bottom at the rate of 500 +50 cc/minute. The draining drop rate
in this particular apparatus should approximate 0.5 inch per minute. The test fluid shall be charged
in the container to a level which corresponds to approximately 0.5 inch above the top of the
specimen.
c. Next, the specimen shall be slowly placed into the container such that the specimen is oriented in
the direction of rise (bun height) and supported off the bottom of the container by two glass rods
and spaced 0.5 inch from all sides of the container. Fuel shall then be drained at the prescribed rate
until flow ceases and the specimen then allowed to drain in this position for an additional 2 minutes.
d. The specimen shall then be carefully removed from the container and weighed to the nearest 0.1
gram. Care should be taken not to spill the fluid from the bottom surface of the specimen when
removing from the test rig. Using the specimen weights before and after fluid wetting in grams,
specimen volume in cubic centimeters, and fuel density in grams per cubic centimeter, the percent
volume retention shall be calculated as follows:
percent retention = (wet specimen weight-dry specimen weight)x100
specimen volume x density of fuel
e. All values, including test fluid temperature, shall be reported.
4.6.10.2 Water retention test. Using one water retention specimen specified (see 4.6.10.1), the
volume percent retention shall be determined using the same procedure. The test fluid shall be unused
distilled water which has been tested for temperature and density just prior to use. CAUTION: Do no
run more than two tests per batch of water.
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