MIL-DTL-5498G
4.6.6.1 Gas charge leakage. Immediately after completion of the tests specified in step 1
of table II, the fluid port shall be opened to the atmosphere. The accumulator shall be placed in a
cold box and the temperature shall be reduced to -65 °F. The gas pressure shall be replenished to
provide 1,000 psi pressure when the temperature is stabilized at -65 °F. The accumulator shall be
kept in a horizontal position for a period of 24 hours. There shall be no external leakage.
Leakage of gas through the fluid port shall not exceed the rate of:
a. 2 milliliters (mL) of free gas per hour for M5498-1 and -2 accumulators.
b. 3 mL of free gas per hour for M5498-3, -4, and -5 accumulators.
c. 10 mL of free gas per hour for M5498-6 and -7 accumulators.
4.6.7 Leakage. There are different leakage tests for qualification and conformance
inspections.
a. Qualification - after completion of step 6 in table II, the leakage tests specified in
4.6.7.1 and 4.6.7.2 shall be performed. After completion of the leakage tests, the accumulator
shall be disassembled and the accumulator piston removed. A new set of packing gland seals
may be installed at this time. The accumulator will then be reassembled with the accumulator
piston not installed and step 7 of table II will be performed.
b. Conformance - the leakage tests specified in 4.6.7.3 and 4.6.7.4 shall be performed.
4.6.7.1 Normal temperature gas leakage for qualification tests. With the fluid port open
to atmosphere, gas pressure shall be applied to the gas port at both 200 psi ± 25 psi and
2,000 psi ± 50 psi. There shall be no evidence of external leakage. Internal leakage shall be
no greater than:
a. 5 mL per hour of free gas for M5498-1 and -2 accumulators.
b. 10 mL per hour of free gas for M5498-3, -4, and -5 accumulators.
c. 20 mL per hour of free gas for M5498-6 and -7 accumulators.
4.6.7.2 Fluid leakage for qualification tests. With the accumulator mounted in a vertical
position with the gas port down and open to the atmosphere of 4 inches ± 0.5 inches of mercury
and 3,000 psi ± 50 psi shall be applied to the fluid port for a period of 1 hour. There shall be no
evidence of external leakage and internal leakage shall not exceed a total of two drops.
4.6.7.3 Normal temperature gas leakage for conformance tests. With the fluid port open
to atmosphere, gas pressure shall be applied to the gas port at both 200 psi ± 25 psi and
2,000 psi ± 50 psi. There shall be no evidence of external leakage. Internal leakage shall be
no greater than:
a. 2 mL per hour of free gas for M5498-1 and -2 accumulators.
b. 3 mL per hour of free gas for M5498-3, -4, and -5 accumulators.
c. 10 mL per hour of free gas for M5498-6 and -7 accumulators.
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