MIL-DTL-5508C
4.4 Conformance inspection. The conformance inspection shall consist of individual
tests and sampling tests.
4.4.1 Individual tests. Each hydraulic fuse submitted for acceptance under contract shall
be subjected to the following tests as specified in 4.5:
a.
Examination of product (see 4.5.1).
Proof pressure (see 4.5.2).
b.
c.
Leakage (see 4.5.3).
Volumetric capacity (see 4.5.4).
d.
4.4.1.1 Inspector's tests. The fuses may be subjected to any of the other additional tests
specified herein that the inspector considers necessary to determine conformance with any of the
requirements of this specification.
4.4.2 Sample lot. Fuses in quantities of not greater than 100 and offered for delivery at
approximately the same time shall be considered a lot. A sample shall be defined as three fuses
selected at random from a lot.
4.4.3 Sampling tests. When specified (see 6.2), a sample that has passed the individual
tests of 4.4.1 shall undergo additional testing, which will include one or more of the tests listed
below. The lot shall be rejected if any defect is found in the sample.
Immersion (see 4.5.5).
a.
Pressure drop (see 4.5.6).
b.
c.
Extreme temperature operation (see 4.5.7).
Endurance (see 4.5.8).
d.
Acceleration (see 4.5.9).
e.
Bleeding (see 4.5.10).
f.
Resetting (see 4.5.11).
g.
h.
Burst pressure (see 4.5.12).
4.5 Test methods.
4.5.1 Examination of product. Each hydraulic fuse shall be carefully examined to
determine conformance with this specification with respect to material, workmanship, marking,
any visible defects, and conformance with applicable drawings.
4.5.2 Proof pressure. Hydraulic pressure shall be applied to the automatic quantity
measuring hydraulic fuse by means of a hand pump. Pressure shall be maintained for a period of
five minutes. The fuse shall withstand a hydrostatic test pressure of 1.50 times the rated pressure
without evidence of external leakage, failure, or distortion.
4.5.3 Leakage. When the fuse is closed, pressure shall be applied to the upstream side of
the fuse. The leakage measurement shall consist of the last three minutes of a five-minute period.
Leakage through the fuse shall not exceed 15 cubic centimeters (cc) per hour (approximately five
drops per minute), at any pressure from 40 psi to 150 psi. Leakage shall not exceed 1/2 cc per
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