MIL-DTL-13444H
4.6.8.5 Discontinuation and resumption of production of bulk hose (three years or more). If there has
been no production of a specific size for a period of three years or more, twelve (12) samples for each
test shall be randomly selected from the first lot produced when production of that size has been
resumed. Eight (8) of the samples shall be subjected to the sampling tests and four (4) samples shall be
subjected to the periodic control tests (see table VIII).
4.6.8.6 Discontinuation and resumption of production of hose assemblies (three years or more). If
there has been no production of a specific size for a period of three years or more, eight (8) samples shall
be randomly selected from the first lot produced when production of that size has been resumed. All of
the samples shall be subjected to the sampling tests.
4.7 Performance.
4.7.1 Test methods. The following identified tests and test methods assure hose and hose assembly
integrity within typical operating conditions and applications. Alternate commercial industry standard test
methods are allowed; however when an alternate method is used, documented approval must be
obtained from the qualifying activity prior to the performance of the test. The test methods described
herein are proven methods and shall be the referee method in case of dispute.
4.7.2 Inspection conditions. Unless otherwise specified, all inspections shall be performed in
accordance with the test conditions specified in ASTM D380, or in accordance with the applicable test
method referenced in the test procedures. Unless otherwise specified, room temperature shall be
defined as +60°F to +90°F (15.56°C to 32.22°C).
4.7.3 Visual and mechanical inspection. Hose and hose assemblies shall be examined to ensure
conformance with this specification and associated specification sheets. Hose and hose assemblies shall
be examined to verify that the design, construction and physical dimensions are in accordance with the
applicable requirements. Continuous examination shall be performed to assure compliance with the
following requirements:
Specification sheets (3.1).
a.
b.
Design, construction, materials, and physical dimensions (3.5).
Marking (3.7)
c.
d.
Age limit (3.8)
Workmanship (3.9)
e.
4.7.4 Elongation and contraction (see 3.6.1). The elongation and contraction shall be tested as
specified in ASTM D380 and meet the requirements of 3.6.1. The following details shall apply:
a. Test specimens shall consist of three hose assemblies, each not less than 18 inches (457.20
mm ) between fittings.
b. Final pressure shall be the working pressure specified in table IV for the type and size hose
tested.
c. Average change in length of the three specimens, expressed in percentage of the original
length, shall be calculated and used to determine conformance to 3.6.1.
4.7.5 Proof pressure (see 3.6.2). The proof pressure test shall be as specified in
ASTM D380 and meet the requirements of 3.6.2. The following details shall apply:
a. Each bulk hose length and each hose assembly shall be subjected to this test.
b. Proof pressures shall be as specified in table IV for the type and size tested.
c. The test fluid may be water, engine oil conforming to MIL-PRF-2104, or hydraulic oil
conforming to MIL-PRF-87257, MIL-PRF-5606 , or MIL-PRF-83282.
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