MIL-DTL-8788F
4.7 Test methods.
4.7.1 Examination of product. Each hose length shall be visually examined for conformance to the
following requirements:
a. Design and construction (see 3.3).
b. Dimensions (see 3.4).
c. Interchangeability (see 3.6).
d. Age limitations (see 3.8).
e. Workmanship (see 3.9).
f. Marking (see 3.10).
4.7.2 Cleanliness inspection. Both ends of the hose length shall be visually inspected to determine if
caps or plugs are installed (see 3.7). The caps or plugs shall then be removed and a light source shall be
placed at one end. The interior of the hose shall be visually examined, without magnification, from the
opposite end of the light source. Conformance shall be as specified in 3.7.
4.7.3 Proof pressure test (see 3.5.1). Hoses when subjected to proof pressure testing in accordance
with ASTM D380 shall meet the requirements of 3.5.1. The following details shall apply:
a. Proof pressure shall be in accordance with table I.
b. Test fluid shall be water or fluid conforming to MIL-PRF-5606, MIL-PRF-87257, or
MIL-PRF-83282.
4.7.4 Diameter reduction (see 3.5.2). Hoses when subjected to oil aging shall meet the diameter
reduction requirements of 3.5.2. The following details shall apply:
a. Prior to testing, two hose lengths shall be oil aged as specified in 4.6.4.2.
b. Following the aging process, the ID of the hose shall be measured at a distance of at least 1/2
inch (.500 inch) (12.7 mm) from each end of the hose.
4.7.5 Elongation and contraction (see 3.5.3). Hoses when subjected to the elongation and contraction
test in accordance with ASTM D380 shall meet the requirements of 3.5.3. Test pressure shall be 3,000
psi (206.84 bar) minimum and held for 5 minutes.
4.7.6 Leakage test (see 3.5.4). Hoses when subjected to the leakage test shall meet the
requirements of 3.5.4. Leakage shall be tested in accordance with ASTM D380. The following details
shall apply:
a. Two unaged samples shall be tested.
b. The samples shall be a minimum of 12 inches (30.48 cm) in length.
c. Test fluid shall be water or hydraulic fluid conforming to MIL-PRF-5606, MIL-PRF-87257 or
MIL-PRF-83282.
d. Samples shall be subjected to 70% of the burst pressure specified in table I and held for 5
minutes.
e. After 5 minutes, the pressure shall be released and reduced to zero.
f. Then the pressure shall be raised again to 70% of the burst pressure and held for another 5
minutes.
g. The adjacent outer cover shall be carefully inspected during this period for any wicking or
leakage of the test fluid.
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