MIL-DTL-13444H
3.6.2 Proof pressure. When tested in accordance with 4.7.5, the test samples shall withstand the
proof pressure up to and including that specified in table IV without leakage.
3.6.3 Burst pressure. When tested in accordance with 4.7.6, the test samples shall not burst at any
pressure up to that specified in table IV. There shall be no leakage around the fittings of test samples
below the specified minimum burst pressure.
3.6.4 Low temperature flexibility. The test samples shall show no evidence of breaks when subjected
to the low temperature flexibility test specified in 4.7.7.
3.6.5 Ozone resistance. The covers of type I hose shall show no evidence of cracks or breaks when
subjected to the ozone resistance test specified in 4.7.8.
3.6.6 Vacuum collapse resistance. The decrease in the outside diameter of type I hose shall be not
greater than 15 percent when subjected to the vacuum collapse resistance test specified in 4.7.9.
3.6.7 Oil resistance. When tested in accordance with 4.7.10, the test samples shall be within the
limits for volume change specified in table V.
TABLE V. Allowable volume change.
Tube
Cover
Condition
Percent
Percent
decrease
increase
increase
After oil immersion
---
---
---
Type I
5
25
100
Type III
0
30
---
After fuel immersion
---
60
110
3.6.8 Fuel resistance. When tested in accordance with 4.7.11, the test samples shall be within the
limits of volume change specified in table V.
3.6.9 Vibration resistance. The test samples when subjected to the vibration resistance test specified
in 4.7.12 shall not leak nor shall show any evidence of damage.
3.6.10 Fungus resistance. The test samples when subjected to the fungus resistance test specified in
4.7.13 shall show no evidence of damage affecting performance.
3.6.11 Hot oil circulation. The hose samples of type III shall exhibit no leaks, ruptures, or cracks,
internally or externally when subjected to the hot oil circulation test specified in 4.7.14.
3.6.12 Salt spray testing. When fittings are exposed to salt spray testing specified in 4.7.15 the
plating shall show no corrosion products of zinc or basis metal corrosion products. The appearance of
corrosion products visible to the unaided eye at normal reading distance shall be cause for rejection,
except for white corrosion products at the edges of the specimens shall not constitute a failure.
3.7 Marking.
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