MIL-DTL-5498G
Table II. Cycling and endurance tests1.
Fluid pressure
Temperature
cycling limits
(°F ± 10°F
Cycle
Leakage of fluid
(psi)
except as noted)
rate
to gas side
Leakage of gas
Total
(cycles
Lower Upper
(percent of
(percent drop
Step
Gas charge
Ambient
cycles
limit
limit
per
accumulator's
in gage
5
number
(psi ± 25 psi)
air
(minimum)
max.
min.
minute)
Fluid
volume)
pressure)
--2
1
2,000
0.2 to 2
1,000
200 3,000
275 min.
2
1
2
Gas charge leakage test (see 4.6.6.1)
--3
3
50
500
200
3,000
-65 max.
-65 max.
0.5
5
4
500 0.2 to 2
500
200
3,000
-40 max.
-65 max.
1
3
--2
5a
2,500 3 to 10
1,000
200
3,000
275
3
3
--2
5b
7,500 3 to 10
1,000
200
3,000
225
3
3
--2
6a
12,500 3 to 10
500
2,600
3,000
275
2
3
--2
6b
37,500 3 to 10
500
2,600
3,000
225
2
3
N/A4
--2
7a
12,500
Optional
10
3,500
100
N/A
N/A
N/A4
--2
7b
500,000
Optional
200
3,000
275
N/A
N/A
N/A4
--2
7c
1,000,000
Optional
2,000
3,000
100
N/A
N/A
1
The tests for steps 1 through 6 will be conducted in a test rig similar to that shown in figure 2. During all cycling tests, the gas side of the accumulators
shall be lubricated with an amount of fluid equal to approximately 0.50 of 1 percent of the accumulator rated volume. Fluid leakage shall be determined
by draining through the gas port without disassembling the accumulator. Gas pressure shall be measured at stabilized and identical temperature before
and after each step of table II.
2
Ambient temperature shall be maintained so that the gas temperature equals or exceeds the fluid temperature at the end of each compression stroke.
3
The accumulators shall be charged to a minimum of 3,000 psi fluid pressure. Accumulators shall be maintained in this condition for 24 hours at the
temperature specified in step 3 of table II. The 50 cycles shall be fast discharge followed immediately by recharge with oil at the specified temperature.
A 2 hour minimum interval shall elapse between each cycle.
4
The accumulator piston shall be removed for all tests of step 7. The gas port shall be capped during this test. This test is intended to prove design of
the accumulator shell construction and end cap construction. These tests shall be conducted in a test rig similar to that shown in figure 3. The rate of
pressure buildup and the peak pressures shall be recorded at the start and finish and at least 10 equally spaced intervals during each test. The pressure
buildup rate shall be between 100,000 psi and 200,000 psi per second.
5
Be sure not to count the lubrication fluid on the gas side as leakage.
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