MIL-DTL-18492B (OS)
4.3 Preproduction inspection. Preproduction inspection at the Government option shall consist of all the
examinations and tests, unless declared "not applicable", in accordance with Table I to determine
acceptability of the tank and tank covers.
4.4 Quality conformance inspection. Production quality conformance inspection shall consist of all
examinations and tests as specified in Table I.
4.5 Test procedures (First Article).
4.5.1 Air tightness (cover assembly). Each cover assembly with its gasket shall be assembled with a
master tank or equivalent. The assembly shall be subjected to an internal air pressure of 5 pounds per
square inch gauge for a minimum of 30 seconds while submerged in water containing one of the
following wetting agents: Polysorbate 20, Polysorbate 40, Sodium Laurly Sulfate, or alkylsulfonate, used
at a concentration recommended by the manufacturer. The master tank or its equivalent shall have a
means for applying air under pressure to the cover or tank to be tested. The tank shall be thoroughly
examined for leaks. A tank which does not meet the requirements of 3.13 shall be considered defective.
4.5.2 Air tightness - tank assembly (when stacked). Each tank shall be assembled with a master cover
and gasket, submerged, and weight loaded as indicated on BUWEPS Drawing 99085. The assembly shall
be subjected to an internal air pressure of 5 pounds per square inch gauge for a minimum of 30 seconds
while submerged in water containing one of the following wetting agents: Polysorbate 20, Polysorbate
40, Sodium Laurly Sulfate, or alkylsulfonate, used at a concentration recommended by the manufacturer.
The master tank or its equivalent shall have a means for applying air under pressure to the cover or tank to
be tested. The tank shall be thoroughly examined for leaks. A tank which does not meet the requirements
of 3.13 shall be considered defective.
4.5.3 Serviceability (when stacked). The same tanks, when tested in accordance with 4.5.2, shall be
loaded with dummy ammunition, or as otherwise stated by the Government. The tanks, assembled with
their own covers, shall be weight loaded as shown on BUWEPS Drawing 99085. A tank which does not
meet the requirements of 3.14 shall be considered defective.
4.5.4 Drop test. Five of the tanks, tested in accordance with 4.5.2, shall be assembled with their own
covers and loaded with dummy ammunition or an equivalent inert configuration to simulate the service
load. Each of the inert loaded tanks shall be dropped from a distance of 3 feet, four times onto a concrete
or similarly unyielding surface so as to land initially on the bottom edge, top edge, top and bottom edges
simultaneously, and the top and bottom edges simultaneously 180° from the preceding position. Each
tank shall be then placed in a vertical position, top uppermost, and toppled over so as to land on a piece of
lumber having a cross-section of 4 inches by 4 inches and to strike the tank approximately 10 inches from
the top. Upon completion of the drop tests, the air tightness test of 4.5.2 and serviceability test of 4.5.3
shall be repeated.
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