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Pressure (carbon dioxide chamber) |
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|  MIL-L-85824A(AS)
4.8.2 Operation (carbon dioxide). The life raft with a carbon dioxide
cylinder conforming to 3.5.5.1 Installed, shall be unfolded and placed in a
horizontal position on the floor, or on a table in the Inspection area. For
actuation purposes, a four inch length of lanyard shall be attached to the hole
of the inflation assembly actuation lever. The time shall be recorded and the
inflation assembly shall be immediately actuated with an abrupt pull of the
lanyard. The life raft shall be observed during the inflation for conformance to
the requirements of 3.8.1. Forty, plus or minus twenty-five minutes after the
raft has been Inflated, the temperature and barometric pressure of the inspection
area and the pressure in the carbon dioxide chamber of the raft shall be
recorded. All pressure readings shall be taken with the life raft in a
horizontal position. The recorded pressure shall then be corrected to a
temperature of 700 Fahrenheit (21 o Celsius) and a barometric pressure of
29.92 inches of mercury using the correction factors specified in 4.7.1.1 and
4.7.1.2. The corrected pressure shall conform to the requirements of 3.8.1.
Upon completion of this test and examination, the actuation lanyard shall be
removed and the chamber shall be completely deflated in preparation for the
pressure test. Deflation shall be through the oral inflation valve assembly.
4.8.3 Pressure (carbon dioxide chamber). This test shall be performed on the
carbon dioxide chamber only and with the carbon dioxide cylinder installed. The
completely deflated life raft shall be placed on the floor, or on a table in the
inspection area. All pressure readings shall be taken with the raft in a
horizontal position. The chamber shall be inflated with air (see 4.7.4) through
the oral Inflation valve assembly to a pressure of 5.0 psig and the air supply
securely shut-off. After a minimum of 15 minutes, the pressure in the chamber
shall be checked, and readjusted if necessary, to the original pressure of 5.0
psig. At the end of 10 minutes after the readjustment period, the pressure shall
be recorded and checked for conformance to the requirements of 3.8.2. Visual
examination for conformance to the requirements of 3.8.2 shall be performed upon
completion of the pressure check. Upon completion of this test and examination,
the chamber shall be completely deflated through the oral Inflation assembly in
preparation for the leakage test (4.8.4).
4.8.4 Leakage. Leakage tests (4.8.4.1 and 4.8.4.2) shall be performed at the
prevailing temperature and barometric pressure within the ranges specified in
4.7.1. The carbon dioxide cylinder shall be installed for this test. The rafts
may be stacked one upon another during the four hour waiting period providing the
temperature is recorded at the level comparable to the height at which the raft
was stowed; and providing that at the end of the four hour waiting period, the
raft to be tested is removed from the stack and placed in a horizontal position
on the floor or on a table in the inspection area. All pressure readings shall
be taken with the raft in this position. In no instance shall the pressure
reading be taken with another raft stacked upon it.
4.8.4.1 Carbon dioxide chamber. The orally Inflated chamber shall be
completely deflated for this test and examination. The carbon dioxide chamber
shall be inflated through its oral inflation assembly with air (see
4.7.4) to a pressure of 2.0 psig and the air supply securely shut-off. After a
minimum of 15 minutes the pressure In the chamber shall be checked and
readjusted, if necessary, to the original pressure of 2.0 psig. The air supply
shall be disconnected and the time, temperature, and barometric pressure shall be
immediately recorded. At the end of not less than 4 hours after the
readjustment, the time, temperature, barometric pressure, and pressure in the
chamber shall be again recorded. The chamber pressure shall be then corrected
for any change in the temperature and barometric pressure (see 4.7.1.1 and
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