MIL-DTL-27267D
4.6.3.7 High temperature burst pressure. Samples shall be tested in accordance with SAE-AS2078.
The test fluid shall conform to MIL-PRF-7808, MIL-PRF-83282, or MIL-PRF-87257. The samples shall be
observed throughout the test. The type of failure and the pressure at which failure occurred shall be
recorded. Conformance shall be as specified in 3.5.3.7.
4.6.3.8 Low temperature flexing. The following samples shall be tested in accordance with
SAE-AS2078: one unaged sample, one sample that was subjected to the stress degradation test (see
4.6.3.5), and one sample that was subjected to the fuel resistance test (see 4.6.3.12). Conformance shall
be as specified in 3.5.3.8.
4.6.3.9 Vacuum. Hose assembles when subjected to vacuum testing in accordance with
SAE-AS2078 shall meet the requirements of 3.5.3.9. The following details shall apply:
a. Samples that were tested for low temperature flexibility (see 4.6.3.8) shall then be subjected to
vacuum testing in accordance with SAE-AS2078.
b. The applicable negative pressure used shall be as specified in table X and ball diameters shall
be as specified in SAE-AS1946.
TABLE X. Vacuum test conditions. 1/ 2/
Nominal
Ball diameter
Negative pressure
Hose size
ID
(in Hg)
inches
mm
inches (mm)
-4
.188 (4.78)
.125 - .132
3.18 - 3.35
28
-5
.250 (6.35)
.187 - .193
4.75 - 4.90
28
-6
.313 (7.95)
.250 - .255
6.35 - 6.48
28
-8
.406 (10.31)
.332 - .337
8.43 - 8.56
28
-10
.500 (12.70)
.421 - .426
10.69 - 10.82
28
-12
.625 (15.88)
.531 - .538
13.49 - 13.67
20
-16Z
.875 (22.23)
.770 - .778
19.56 - 19.76
14
-20Z
1.125 (28.58)
.996 - 1.004
25.30 - 25.50
10
-24Z
1.375 (34.93)
1.246 - 1.252 31.65 - 31.80
8
1/ Dimensions are in inches.
2/ Metric equivalents are given for information only.
4.6.3.10 Volumetric expansion. Hose assemblies when subjected to volumetric expansion in
accordance with SAE-AS2078 shall meet the requirements of 3.5.3.10. Only two samples, one of size -4
and one of size -5, shall be tested in accordance with SAE-AS2078 except that the operating pressure
used shall be 1000 psi (7 MPa).
4.6.3.11 Leakage. Hose assemblies when subjected to leakage tests in accordance with
SAE-AS2078 shall meet the requirements of 3.5.3.11, the following details shall apply:
a. Test fluid shall be water or fluid conforming to MIL-PRF-5606 MIL-PRF-83282 or
MIL-PRF-87257.
b. Leakage shall be determined by wrapping a white paper towel tightly around the sample so
that the towel is in contact with the braid.
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