MIL-DTL-27272C
h. The socket shall be removed from the hose by holding the hose behind the socket and firmly
tapping the threaded end flat against a table or bench. The socket shall be threaded back off the
end of the hose. The socket is forced further "onto" the hose so that the sleeve can be removed.
i. The sleeve shall be removed by gripping it lightly with pliers across the outer diameter, or by
inserting the nipple slightly into the end of the sleeve and gently prying it out without damaging
the metal seal area of the sleeve. The socket shall then be slid off the hose.
j. After each disassembly, the fitting components shall be cleaned with air pressure to remove dirt
or other foreign matter and inspected. Upon disassembly, there shall be no evidence of galling or
binding of assembled components and the swivel nut shall be free to turn by hand.
4.6.3 Joint integrity proof pressure. Fitting assemblies or subassemblies having brazed, welded, or
mechanically attached joints shall be subjected to the applicable proof pressure specified in table II.
One of the test samples shall be capped and the proof pressure applied through the other end for a
minimum of 30 seconds or a maximum of 5 minutes. The test fliud shall be water. Any evidence of
failure at any of these joints shall be cause for rejection (see 3.4.3).
4.6.4 Proof pressure. Prior to testing, each hose assembly shall be examined to ensure that it is
properly assembled. The hose assembly shall then be subjected to the proof pressure test in accordance
with SAE AS2078 using the applicable proof pressure specified in table II. Hose assemblies with
aluminum flange fittings (class 2) shall be proof tested using the applicable operating pressure listed in
table II. The test fluid shall be water; however, fluid conforming to either MIL-PRF-5606 or
MIL-PRF-83282 may be used during qualification testing. The fitting shall show no evidence of leakage,
burst, separation from the hose, or permanent deformation (see 3.6.4).
4.6.5 Leakage. The hose assembly shall be subjected to the leakage test in accordance with
SAE AS2078. The test fluid shall be water or fluid conforming to either MIL-PRF-5606 or
MIL-PRF-83282. The fittings shall show no evidence of leakage or permanent deformation (see 3.6.5).
4.6.6 Room-temperature burst pressure. The hose assembly shall be subjected to the burst test in
accordance with SAE AS2078 using the applicable room-temperature burst pressure specified in table II.
The test fluid shall be water or fluid conforming to either MIL-PRF-5606 or MIL-PRF-83282. The fitting
shall not leak, burst, or separate from the hose (see 3.6.8).
4.6.7 Stress degradation. Samples shall be subjected to testing in accordance with SAE AS2078
except that the assembly shall be flushed with fluid conforming to MIL-PRF-680 or ASTM D471, reference
fuel B, after the third cycle and prior to the drying process. At the completion of the effusion test, the hose
assemblies shall be placed in a cold chamber for 8 hours while the temperature is maintained at -65 ±2°F.
After 8 hours, fluid conforming to MIL-PRF-7808 and at 400 ±10°F shall be circulated through the
samples. Within 15 seconds after the introduction of the hot fluid, the pressure shall be increased to the
applicable proof pressure specified in table II and held for at least 2 minutes. Conformance shall be as
specified in 3.6.7.
4.6.8 Pneumatic surge. The hose assembly shall be subject to the pneumatic surge testing in
accordance with SAE AS2078. The applicable operating pressure shall be as specified in table II and the
applicable proof pressure shall be as specified in table II. The fittings shall show no evidence of leakage
or separation from the hose following this test (see 3.6.12).
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