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Pressure test for first article and sampling tests |
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|  MIL-T-18847C(AS)
4.6.11 Functional test of components. The completely assembled tank shall
be checked to determine satisfactory functioning of the fuel system, air
pressure and vacuum relief valves, and fuel quantity gaging components
furnished as part of the tank. The fluid used for this test shall be in
accordance with MIL-T-5624.
4.6.12 Pressure test. The air pressure line and other openings, except
the one for applying pressure, shall be sealed and the tank shall be subjected
to the pressure test of 4.6.12.1 or 4.6.12.2 as applicable. During the test,
leakage of the tank shall be detected by the application of a soap solution at
all seams and fittings while the tank is under air pressure or by filling the
tank with a fluorescent dye and examining the exterior surface with the
ultra-violet lamp.
4.6.12.1 Pressure test for first article and sampling tests. Tanks
designed for pressure fueling shall be subjected to the following tests
a., b., and c. without leakage or failure. Tank designed for gravity fueling
only shall be subjected to tests b. and c. and shall not be subjected to the
pressure test at 86 psig. These tests shall be conducted both before and
after the load tests of paragraph 4.6.16.
An internal positive pressure of 86 psig (115 percent of design
a.
limit pressure) for 3 minutes.
b. An internal negative pressure of -10 psig for 3 minutes.
An internal positive pressure of 50 psig (200 percent of design
c.
operating pressure) for 15 minutes.
4.6.12.2 Pressure test of individual tanks. Each production assembly
shall be pressure tested to the following tests a., b., and c. without
failure, leakage, or permament set:
a. An internal negative pressure of -10 psig for 3 minutes.
b. An internal positive pressure of 75 psig for 3 minutes.
c. A positive pressure of 15 psig for l5 minutes.
4.6.13 Tank capacitv. The usable capacitv of the tank shall be checked
for conformance with the requirements of 3.5.1.3 herein.
4.6.14 Slosh/vibration. Each compartment of the tank shall be filled to
two-thirds of its capacity with water containing a fluorescent dye to aid in
examining the leakage with an ultra-violet lamp. The tank shall not be
pressurized for the test. The tank center line shall be at least 20 inches
above the slosh axis. The duration of the test shall be 12.5 hours in the
pitching condition and 12.5 hours in the roll condition. Upon completion, the
tank shall be completely filled with water and vibrated for 10 minutes. The
displacement of the tank during the slosh/vibration test shall be not less
than 0.032 inches double amplitude measured at the suspension lugs of the
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