MIL-DTL-5624V
APPENDIX A
A.4 PREPARATION
A.4.1 Preparation of apparatus and sample containers. All components of the filtration
apparatus (except the vacuum flask), sample containers, and their caps shall be cleaned as
described in ASTM D5452. All metal parts of the filtration apparatus are to be electrically
bonded and grounded, including the fuel sample container. See ASTM D5452 for other safety
precautions.
A.5 SAMPLING
A.5.1 Sample. Obtain a representative 3.785 liters (1 gallon) sample as directed in
ASTM D5452. When sampling from a flowing stream is not possible, an all-level sample or an
average sample in accordance with ASTM D4057 and/or ASTM D4177 shall be permitted. The
3.785 liter sample container shall be an interior epoxy-coated metal can, a brown glass bottle, or
a clear glass bottle protected by suitable means from exposure to light.
A.6 PROCEDURE
A.6.1 Test procedure.
a. Using forceps, place a new membrane (test) filter in a clean petri dish. Place the petri
dish with the lid slightly ajar in a 90° C ± 5° C oven for 30 minutes. Remove the petri dish from
the oven and place it near the balance with the lid slightly ajar, but still protecting the filter from
airborne contamination, for 30 minutes.
b. Weigh the test filter. A filter weighing in excess of 90 mg shall not be used in the test.
c. Place a flow reducing washer (required only for JP-4 fuel filtration time testing) on top
of the funnel base. Then place a test filter on top of the reducing washer and secure the funnel to
the funnel base.
d. Immediately prior to filtering the fuel, shake the sample to obtain a homogenous mix
and ensure that fuel temperature does not exceed 30° C. Clean the exterior or top portion of the
sample container to ensure no contaminants are introduced. Any free water present in the fuel
sample will invalidate the filtration time results by giving an excessive filtration time rating.
e. With the vacuum off, pour approximately 200 mL of fuel into the funnel.
f. Turn vacuum on and record starting time. Continue filtration of the 3.785 liter sample,
periodically shaking the sample container to maintain a homogenous mix. Record the vacuum
(kPa or inches inches of mercury) 1 minute after start and again immediately prior to completion
of filtration. Throughout filtration, maintain a sufficient quantity of fuel in the funnel so the
membrane filter is always covered.
g. Record the filtration time in minutes expressed to the nearest whole number. If
filtration of the 3.785 liters is not completed within 30 minutes, the test shall be stopped and the
volume of the fuel filtered shall be measured. In these cases, report the filtration time as "greater
than 30 minutes" and the total volume of fuel filtered.
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