MIL-DTL-46162E
APPENDIX B
B.7 Test procedure.
a. Membrane filters shall be removed from the package and placed in an oven for a
minimum of 15 minutes at 90°C (194°F). After preheating, but prior to weighing,
the membrane filters shall be stored in a desiccator.
b. Each membrane filter shall be weighed. A filter weighing in excess of 90 mg
(0.0003 oz) shall not be used in this test.
c. The membrane filter shall be placed directly over the insert ring. The top funnel shall
be locked into place.
d. Immediately prior to filtering the fuel, shake the sample to obtain a homogenous mix
and assure that fuel temperature does not exceed 30°C (86°F). Clean the exterior or
top portion of the sample container to insure that 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 (6.8 oz) of fuel into the funnel.
f. Turn vacuum on and record starting time. Continue filtration of the 3.79 liters
(one gallon) sample, periodically shaking the sample container to maintain a
homogenous mix. Determine the vacuum in kPa (inches of mercury) one minute
after start again immediately prior to completion of filtration. Throughout filtration,
maintain a sufficient quantity of fuel in the funnel so that the membrane filter is
always covered.
g. Determine the filtration time in minutes expressed to the nearest whole number. If
filtration of the 3.79 liters (one gallon) is not completed within 30 minutes, the test
will be stopped and the volume of the fuel filtered will be measured. In these cases,
results will be reported as 30+ minutes/volume of fuel filtered.
h. Determine the vacuum in kPa from the average of the two readings taken in B.7f.
i. After determining the filtration time, shut off the vacuum, rinse the sample container
with approximately 100 mL of filtered petroleum ether and dispense into the filtration
funnel. Turn the vacuum on and filter the 100 mL rinse. Turn vacuum off and wash
the inside of the funnel with approximately 50 mL (1.7 oz) of filtered petroleum
ether. Turn vacuum on and filter. Repeat the funnel rinse with another 50 mL of
petroleum ether but allow the rinse to soak the filter for approximately 30 seconds
before turning the vacuum on to filter the rinse. With vacuum on, carefully remove
22
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business