MIL-PRF-14442E(AT)
4.8.6 Puncture resistance. To determine conformance to 3.5.9, a test specimen of tank
wall construction shall be fastened in a specimen holder as shown in figure 2. A piercing
instrument, with its piercing end as shown in figure 2, shall be forced against the specimen in the
holder at approximately the center of the area enclosed by the specimen holder. The force
required to puncture the specimen shall be not less than specified.
4.9 Operating. Conformance to 3.6 through 3.6.3 shall be determined using appropriate
verification methods specified in 4.5 or 4.5.1 and the tests in 4.9.1 and 4.9.2.
4.9.1 Leakage. To determine conformance to 3.6.2, the tank shall be covered with brown
paper and shall be filled with a stoddard solvent (or equivalent) containing a staining agent. The
tank and supported systems shall be subjected to an internal pressure of 1.5 times the maximum
operating pressure of the intended system and allowed to stand for 30 minutes. Tanks intended
for use in non-pressurized systems shall be subjected to an internal pressure equivalent to the
normal head pressure measured at the bottom of the tank multiplied by a factor of 1.5 and shall be
allowed to stand for 30 minutes. The brown paper shall then be examined for stains.
4.9.2 Slosh. To determine conformance to 3.6.3, the test tank, complete with all fittings
and other parts or accessories, shall be mounted in the support jig (see 4.2.2) and installed on a
rocker assembly. It shall be mounted in such a manner that the major (longer) horizontal axis of
the tank shall be 90 degrees (°) to the center line of the axis of the rocker assembly platform. The
interior of the compartment shall be lined with brown paper in the fitting areas and held in place
with tape conforming to ASTM D5486. The test specimen shall be filled two-thirds full with test
fluid conforming to reference fuel B of ASTM D471. In addition, twice the sump capacity of
water shall be added to the tank. The tank shall then be subjected to rocking at approximately
15° angle from the vertical (30° total rocking for 24 hours at a frequency of 16 to 20 cycles per
minute (cpm)), or for 40 hours at 10 to 16 cpm. The temperature of the test fluid during the test
shall be 110 + 10°F. Tanks intended for use in pressurized fuel systems shall be subjected to an
internal pressure of 1.5 times the maximum operating pressure of the intended vehicle system
during the entire test. Tanks intended for use in non-pressurized fuel systems shall be tested at
normal atmospheric pressure. When testing non-pressurized tanks, a vent opening shall be
provided equal to the vent opening in the intended vehicle. The vent shall be connected to a line
and so positioned that any test fluid escaping through the vent shall be carried away from the test
specimen. At the conclusion of the 24 or 40 hours rocking period, as applicable, the tank shall be
completely filled with the specified test fluid and allowed to stand for 1 hour. The test fluid shall
then be drained and the test tank removed from the structure. The paper lining shall be
thoroughly examined for leakage as indicated by stains on the paper. Indication of stains on the
liner paper shall be considered as test failure, except minor stainage due to improperly torqued
bolts, damaged equipment not considered a part of the tank assembly, or minor stainage resulting
from physical damage to the tank at the time of installation.
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