MIL-DTL-27267D
3.5.2.5 Tube conductivity. When tested in accordance with 4.6.2.4, tube sizes -4 through -8 shall
conduct a direct current of not less than 10 µA. Tube sizes -10 through -24Z shall conduct a direct
current of not less than 20 µA.
3.5.3 Hose and hose assembly. The hose (braid reinforced PTFE tube) or the hose assembly,
consisting of the hose assembled with end fittings (see 3.4.3), shall meet the following requirements.
3.5.3.1 Braid flare. When tested in accordance with 4.6.3.1, the length of hose shall pass, by its own
weight, through a ring of applicable inside diameter specified in table IV.
TABLE IV. Braid flare dimensional requirement. 1/ 2/
Maximum flare
Hose Nominal
Expansion
Hose
diameter - ring
ID
diameter
dash size
ID
inches (mm)
inches (mm)
inches (mm)
-4
.188 (4.80)
.230 (5.84)
.500 (12.70)
-5
.250 (6.35)
.300 (7.62)
.560 (14.22)
-6
.313 (7.95)
.370 (9.40)
.625 (15.88)
-8
.406 (10.31)
.475 (12.07)
.750 (19.05)
-10
.500 (12.70)
.585 (14.86)
.875 (22.23)
-12
.625 (15.88)
.720 (18.29)
1.000 (25.40)
-16Z
.875 (22.23)
.995 (25.27)
1.400 (35.56)
-20Z
1.125 (28.58)
1.270 (32.26)
1.700 (43.18)
-24Z
1.375 (34.93)
1.545 (39.24)
1.950 (49.53)
1/ Dimensions are in inches.
2/ Metric equivalents are given for information only.
3.5.3.2 Proof pressure. When subjected to the applicable proof pressure specified in table III and
tested in accordance with 4.6.3.2, the hose shall not leak or fail during or at the completion of testing.
There shall not be any visual evidence of permanent deformation or damage. Furthermore, there shall be
no visual evidence of permanent deformation or damage.
3.5.3.3 Elongation and contraction. When subjected to the applicable operating pressure specified in
table II and tested in accordance with 4.6.3.3, the hose shall not change length by more than +0.20 or
-0.30 inch in 10 inches (+5.1 mm or -7.6 mm in 254 mm) of length.
3.5.3.4 Impulse. The hose assembly shall not leak, burst, or loosen from the test apparatus and
there shall be no evidence of malfunctioning when subjected to 100,000 cycles in accordance with
3.5.3.5 Stress degradation. The effusion rate of the hose assemblies shall not be greater than the
values specified in table V when tested in accordance with 4.6.3.5. Following the introduction of hot oil,
the hose assembly shall not leak when subjected to the applicable proof pressure test specified in 4.6.3.2.
TABLE V. Effusion requirement after stress degradation test.
Hose size
-4
-5
-6
-8
-10
-12
-16Z
-20Z
-24Z
Effusion rate
8.0
8.0
8.0
4.0
2.0
2.0
2.0
2.0
2.0
(cc/in/min)
7
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