MIL-DTL-46162E
APPENDIX B
METHOD FOR DETERMINATION OF FILTRATION TIME
B.1 SCOPE
B.1.1 Scope. This method describes a procedure for determining singularly or
simultaneously the filterability characteristics and solids contamination of jet fuel. The
purpose is to detect and prevent contaminants in jet fuel that can plug and cause rupture of
ground filtration equipment, thereby affecting flight reliability of aircraft. This appendix is a
mandatory part of this specification. The information contained herein is intended for
compliance only.
B.2 APPLICABLE DOCUMENTS. No applicable documents are cited in this appendix.
B.3 SUMMARY
B.3.1 Summary of methods. 3.79 liters (L) (1.0 gallon (gal)) of jet fuel is filtered through a
membrane filter in the laboratory. The time required to filter this volume is measured in minutes
and solids content is determined gravimetrically.
B.4 Apparatus.
a. Membrane filter: White, plain 47 mm (1.3 in.) diameter, nominal pore size
0.8 micrometer (3.1 in.). The membrane must be approved by ASTM for use with
ASTM D5452.
b. Filtration apparatus: Of the types shown in figure 1. It consists of a funnel and
funnel base with a filter support such that a membrane filter can be securely locked
or clamped between the sealing surfaces of the funnel and its base. The funnel and
funnel base shall be of stainless steel or glass construction.
c. Insert ring: A 47 mm (1.9 in.) diameter paper flow reducer ring with dimensions
to give filtering area of 4.8 centimeters square (cm2) (0.74 in.2)). (Millipore
Corporation Part No. XX 20 047 08).
d. Vacuum flask: A minimum of 4 liters (5.3 quarts (qts)).
e. Vacuum system: That develops in excess of 67.5 kPa (20 inches of mercury)
vacuum.
f. Oven: Of the static type (without fan assisted circulation) controlling to 90 ± 5°C
(194 ± 9°F).
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