MIL-DTL-19803G
evaporation loss for a 24-hour period recorded. The container shall meet the requirements
specified in 3.5.9.2.
4.6.10.3 Evaporation loss in pressurized condition. Upon completion of the vented
evaporation loss tests, the complete converter assembly including all components shall be
subjected to a 48-hour evaporation loss test in the pressurized condition. The converter shall be
placed in the pressurized condition, and the initial weight reading shall be taken immediately
after the converter has been filled. The loss in weight for a 48-hour period shall be recorded.
The converter assembly shall meet the requirements specified in 3.5.9.3.
4.6.11 Secondary overpressure safety. The secondary overpressure safety test shall be
performed on the secondary overpressure safety device prior to installation on the converter.
The inlet of the secondary overpressure safety device shall be subjected to a gradually increasing
pressure until rupturing of the frangible safety burst disk occurs.
4.6.11.1 Secondary overpressure safety (standard temperature). The secondary
overpressure safety device shall be conditioned at 72 + 5 °F (22 + 3 °C) for three hours. After
conditioning, and while still at this temperature, the safety device shall be tested as specified in
4.6.11. The safety device shall meet the requirements specified in 3.5.10.1.
4.6.11.2 Secondary overpressure safety (low temperature). The secondary overpressure
safety device shall be conditioned -200 + 5 °F (-129 + 3 °C) for three hours. After conditioning,
and while still at this temperature, the safety device shall be tested as specified in 4.6.11. The
safety device shall meet the requirements specified in 3.5.10.2.
4.6.11.3 Secondary overpressure safety (high temperature). The secondary overpressure
safety device shall be conditioned at 260 + 5 °F (127 + 3 °C) for three hours. After conditioning,
and while still at this temperature, the safety device shall be tested as specified in 4.6.11. The
safety device shall meet the requirements specified in 3.5.10.3.
4.6.12 Vibration. The converter shall be attached by its mounting plate to a rigid test
fixture capable of transmitting the vibration conditions specified herein. The vibration test shall
be conducted at room temperature with the converter filled with liquid oxygen and in the buildup
condition. Tests shall be conducted under both resonance and cycling conditions as specified in
4.6.12.1 and 4.6.12.2. Vibration displacement, velocity or acceleration shall be measured and
interpreted at the specific applied instantaneous test frequency. The vibration test table shall
actually move through the displacement corresponding to the required acceleration at all
frequencies. Local impacting of loose components which results in high "noise" content of the
applied vibration shall not be considered as vibration input. If such "noise" is encountered, a low
pass frequency filter which cuts off at approximately twice the test frequency shall be employed
to reject the "noise." After the vibration test, the converter shall be filled with liquid oxygen and
then vented to the atmosphere for a 24-hour period. The converter shall meet the evaporation
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