MIL-DTL-22706G
TABLE I. Qualification inspection.
Sample 1
Sample 2
Sample 3
Name of
Test
Name of
Test
Name of
Test
test
paragraph
test
paragraph
test
paragraph
Examination of
4.4.1
Examination of
4.4.1
Tensile
4.4.13
product
product
strength
Static proof
4.4.2
Static proof
4.4.2
Scuff strip
pressure
pressure
adhesion
4.4.14
Leakage
4.4.3
Leakage
4.4.3
Low temperature
4.4.4
High temperature 4.4.6
soak
soak 1/
Bend radius
4.4.5
Pressure drop
4.4.7
Abrasion resistance
4.4.12
Endurance
4.4.9
Fluid resistance
4.4.10
Adhesion
4.4.8
Environmental
4.4.11
Adhesion
4.4.8
1/ Without scuff cover
4.4.2 Static proof pressure. The duct shall be sealed and restrained at both ends and
subjected to a static pressure of 250 psia with air, water, or nitrogen at normal ambient
temperatures for five minutes to ensure compliance with the static proof pressure requirements
specified in 3.5. Special caution shall be given to the test when using air or nitrogen at this high
pressure.
4.4.3 Leakage. The test shall be conducted at ambient prevailing temperatures. With the
test duct blocked at both ends, the duct shall be pressurized with air or nitrogen to 150 psia and
with the pressure trapped, the static pressure shall not drop 30 psi in less than one hour.
4.4.4 Low temperature soak. The duct assembly shall be placed in a chamber and cooled
to and maintained at a temperature of -65° +5°F for a period of 8 hours. At the end of the soak
period and at -65° +5°F, a 2,000 lb. force shall be applied on the duct. The force shall cover 6
inches of duct length and overhang the width of the duct when flattened. The force shall be
removed after one minute. This test shall be repeated 25 times with an examination of the duct
upon completion of the test. While at -65 +5°F, the duct shall be subjected to 100 flexing cycles
near each end to permit internal inspection without destroying the duct. A flexing cycle shall
consist of folding the duct back on itself and then returning it to the straight configuration. With
the duct initially at -65 +5°F, it shall be subjected to 25 cycles of the endurance test (see 4.4.9).
Damage to the duct as a result of any of the tests above shall be cause for rejection of the duct
assembly.
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