MIL-PRF-11588H
4.5.3 Hydrostatic pressure. To determine conformance to 3.5.1, each hose assembly
shall be subjected to the pressure test as listed in table II and maintained for 30 seconds. The test
shall be done in accordance with ASTM D380.
4.5.4 Length change and twist. To determine conformance with 3.5.2, the hose shall be
laid out in a straight horizontal position, a measurement of the original length shall be made, after
a pressure of 10 psig is applied and maintained. With a crayon or soft pencil, make a mark on
the top surface of the hose cover at each end adjacent to the coupling. These marks are used as a
means of measuring the amount of twist during the test. The pressure shall then be increased to
100 psig and held for 30 seconds. With the pressure still maintained, the final length
measurement and final twist measurement shall be taken. The percent change in length shall be
calculated as plus for increase and minus for decrease in length. Marking shall not deform or
penetrate top surface of hose.
4.5.5 Burst pressure. A sample of not less than 3 ft or more than 6 ft shall be cut from
the one length selected from each 100 lengths for burst and physical tests. The hose shall be
subjected to a hydrostatic test pressure in accordance with table III. The pressure shall be
supplied at a uniform rate sufficient to develop the test pressure in 10 seconds, +2 seconds.
Nonconformance to 3.5.3 shall constitute failure of the test. The remaining section of hose from
which the test sample has been taken shall be accepted as full length, provided the sample meets
all the requirements of the specification.
4.5.6 Tensile strength, elongation, and adhesion. To determine conformance to 3.5.4,
3.5.5, and 3.5.6, tests for tensile strength, elongation, and adhesion shall be done in accordance
with ASTM D412 and ASTM D413.
4.5.6.1 Tensile and elongation sample. The specimen shall be tested and cut from die
"C" of ASTM D412. The tube shall be buffed to a minimum 0.05 in. thickness.
Nonconformance to 3.5.4 and 3.5.5 shall constitute a failure of this test.
4.5.6.2 Tensile strength and ultimate elongation after immersion. To determine
conformance to 3.5.4 and 3.5.5, the changes in the tensile strength and ultimate elongation after
immersion of the specimen shall be determined in accordance with ASTM D471. The
immersion medium shall be test fluid conforming to ASTM D471, reference fuel B. The
temperature of immersion shall be 158 +3.6F (70 +2C) for style ST hose and 73.4 +3.6F (23
+2C) for style LT hose. The immersion time shall be 48 hours. The immediate deteriorated
properties method shall be used.
4.5.6.3 Original adhesion test. A dry specimen of hose material shall be prepared in ring
or strip form as described in ASTM D380. The adhesion shall be determined in accordance with
the machine method of ASTM D413. Nonconformance to 3.5.6.1 shall constitute failure of this
test.
12
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business