MIL-DTL-5498G
4. VERIFICATION
4.1 Classification of inspections. The inspection requirements specified herein are
classified as follows:
a. Qualification inspection (see 4.3).
b. Conformance inspection (see 4.4).
4.2 Inspection conditions. Unless otherwise specified herein, all inspections shall be
performed in accordance with the test conditions as specified in 4.6.
4.3 Qualification inspection. The qualification test units (as specified in 4.5) shall be
subjected to the following inspections in the order listed:
a.
Separator under pressure (see 4.6.2).
Volumetric efficiency (see 4.6.3).
b.
c.
Fluid immersion (see 4.6.4).
Proof pressure (see 4.6.5).
d.
Cycling and endurance (see 4.6.6).
e.
f.
Leakage (see 4.6.7).
Seizing of parts (see 4.6.8).
g.
h.
Non-destructive inspection (see 4.6.9).
Burst pressure (see 4.6.10).
i.
Fragmentation (see 4.6.11).
j.
4.4 Conformance inspection. Each accumulator submitted for acceptance shall be
subjected to the following tests:
a.
Examination of product (see SAE AS8775).
b.
Non-destructive inspection (see 4.6.9).
Leakage (see 4.6.7).
c.
Proof pressure (see 4.6.5).
d.
4.5 Qualification test units. Two qualification test units shall be built for each size
ordered. The first unit shall be tested to ensure that the clearance between sliding parts will be
within 10 percent of the minimum clearance permitted by the manufacturer's detail drawings. The
second unit shall be tested to ensure that the clearance between sliding parts is at least 80 percent
of the maximum clearance permitted by the manufacturer's detail drawings.
4.6 Methods of inspection.
4.6.1 Hydraulic fluid for testing. The hydraulic fluid used in all testing shall conform to
MIL-PRF-87257 or be compatible with MIL-PRF-87257 hydraulic fluids as specified therein.
4.6.2 Separator under pressure. With the accumulator mounted in a vertical position and
with the gas port down, the accumulator separator shall withstand 4,500 psi ± 100 psi fluid
pressure applied to the fluid port with the gas port open for two minutes without leakage or
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