MIL-PRF-87108B
percent of the inflating medium charge, by weight, in not more than 5 seconds, without leakage
from the transfer assembly body. For this test, a cocking tool may be substituted for the actuator.
4.6.12 Coupling torque. With the diffuser removed and a transfer assembly in the open position,
install or attach a safety plug to the coupler of the transfer assembly with a torque of 25 ft lb. The
transfer assembly shall be submerged in water at a temperature of 70 ± 5 °F. Using nitrogen gas
at 15 psig, pressurize the inlet of the transfer assembly for a minimum of 60 seconds. No leakage
shall be noted. Remove the transfer assembly from the water, and without making adjustments,
examine the assembly. There shall be no evidence of failure or permanent deformation of the
coupler or leakage of the transfer assembly.
4.6.13 Gravity drop test. The inflation device shall be subjected to three individual gravity drop,
or free fall, operation tests. The gravity drop operation test shall be performed with an inflation
device in the following orientations:
a.
Vertical position with the actuator down.
b.
Horizontal position.
c.
Vertical position with the actuator uppermost.
An inflation device, containing a diffuser, shall be securely restrained in a jig or vise. A 6 foot line
of sufficient strength shall be attached to the actuator. A 50 ± 0.5 lb weight shall be attached to
the opposite end of the line. The weight shall then be allowed to free fall so that the full force of
the accelerated mass shall be applied to the actuator through the line. After each of the three
gravity drop operation tests, the inflation device shall meet the requirements as specified in 3.7.9.
After the completion of the three gravity drop operation tests, the inflation device shall be
subjected to and shall meet the requirements described (see 4.6.4.1, 4.6.4.2, 4.6.7, 4.6.8, 4.6.9,
4.6.10, and 4.6.11 in the sequence listed).
4.6.14 Pressure relief. This test is applicable to designs which incorporate frangible disc
overpressure relief devices. With the transfer assembly in the closed position, an inflation device
shall be immersed in water at a temperature of 160 ± 5 °F for a minimum of 15 minutes. The
inflation device shall be removed from the water and, while the transfer assembly is still at 160 ± 5
°F, hydraulic pressure shall be applied to the inlet of the transfer assembly at the rate of
approximately 100 psig/sec until the frangible disc bursts. The frangible disc shall burst at a
pressure between 3,150 and 3,500 psig with no damage to the transfer assembly.
4.6.15 Reliability demonstration. Inflation devices shall be cycled sufficient times to demonstrate
a 0.985 reliability at a confidence of 90%. A cycle shall consist of one charge and one discharge.
The container shall be charged though the outlet of the transfer assembly with 0.5 ± 0.01 lb of
inflating medium, using standard recharging equipment. During the discharging, the inflation
device shall be securely restrained and a diffuser shall be installed following the reliability
demonstration, each inflation device involved in the reliability test shall pass the tests described
(see 4.6.4.1, 4.6.4.2, 4.6.7, 4.6.8, 4.6.9, 4.6.10, and 4.6.11 in the sequence listed).
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