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MIL-T-18847C(AS)
tank.  The frequency of the-vibration shall be between 1940 and 2000 cycles
per minute.  While undergoing the specified vibration, the assembly shall be
rocked at between 16 and 20 cycles per minute through a total angle of 30,
approximately 15 each side of the level position. Upon completion of the
test, there shall be no evidence of any leakage or excessive wear of the
tank.  Any inadvertent release as a result of vibration shall be deemed a
failure.  Following the slosh/vibration test the tank shall be subjected to
the following tests a., b., and c. without failure by any leakage or evidence
of debonding:
a. An internal pressure of 112 psig for 3 minutes.
b. A negative pressure of -12 psig for 3 minutes.
c. A positive pressure of 50 psig for 15 minutes.
4.6.14.1 Method of vibration displacement measurement. An electronic
vibration measuring device whose pickups are permanently mounted on the tank
shall be used to measure the vibration displacement. The average peak value,
at the point being measured during a 30 second interval, shall be taken as the
recorded value.
4.6.15 Environmental tests.
The tank shall be subjected to the following
environmental tests.
4.6.15.1 High and low temperature exposure. The tank shall be dried for
one day at a temperature of 160 5F.  The tank shall then be filled with
fluid in accordance with TT-S-735, Type II, containing a satisfactory staining
agent, and shall be cooled at -65 5F for a period of three days. The
tank shall then be drained and examined for any unsatisfactory condition or
Indication of fluid leakage.  If found satisfactory, the tank shall then be
filled with fluid in accordance with TT-S-735, Type II, containing a
satisfactory staining agent and subjected to a temperature of 160 5F
for a period of three days.  The tank shall then be drained and examined for
any unsatisfactory condition or Indication of fluid leakage. During the
temperature drop, warmup, and leak check phases of this test, the tank shall
be pressurized to 15 psig.  Any leakage shall be considered as tank failure.
All joints, seams, and fittings shall be covered with brown paper to aid in
determining leakage.
4.6.15.1.1 Alternate high and low temperature exposure. In
lieu of the
method using a staining agent and brown paper, the leakage test
may be
conducted by using test fluid in accordance with TT-S-735, Type
II, with a
flourescent dye such as eosin added, and examining the exterior
surface of the
tank with an ultra--vlolet lamp.
4.6.15.2 Fungus test.  All components containing any material that can be
a nutrient or be damaged by fungi shall be tested in accordance with
MIL-STD-81O, Method 508.3.
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