MIL-DTL-83797C
4.7.2 Reduction in diameter see 3.5.2). The inside diameter of two 3-inch (7.62 cm) lengths of hose
shall be measured and recorded. The hose samples shall then be oil-aged in accordance with 4.6.2.
Immediately after the oil-aging, the inside diameter of the hose shall be measured. The measurement
shall be taken a minimum of .5 inch (12.7 mm) into the end. Conformance shall be as specified in 3.5.2.
4.7.3 Field attachability (see 3.5.3). The field attachability of the fitting to the hose shall be a
requirement of the tests of this specification where a test procedure requires a hose assembly. A fitting
shall be attached to each end of a length of bulk hose as specified in 4.6.4. The hose assembly length
shall be specified in tables IV and V. These hose assemblies shall be used for performing the tests of
this specification. Conformance shall be as specified in 3.5.3.
4.7.4 Inner tube bulge, straight coupling (see 3.5.4). Hoses, when subjected to the bulge resistance
test shall meet the requirements of 3.5.4. Four samples shall be checked for bulging of the inner tube and
reduction of fitting nipple inner diameter caused by the attachment of end fittings. The following details
shall apply:
a. Steel ball gages shall be .001 inch (0.03 mm) of the minimum size specified on figure 1 for the
applicable hose size.
b. Without using force or lubrication, the ball shall be placed inside the samples at the bulge gage
inspection point shown on figure 2.
c. Holding the hose in a vertical orientation, the gage is inserted into the end of the hose assembly
at the bulge gage inspection point shown on figure 2.
d. The ball gage shall fall through the section at the end of the adapter in the hose under its own
weight without lubrication and without forcing the ball gage through the adapter-to-hose
interfacing section.
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