MIL-DTL-13444H
4.7.13 Fungus resistance (see 3.6.10). Hose specimens shall be tested in accordance with
MIL-STD-810, method 508, procedure I. to determine conformance to 3.6.10. The following details shall
apply:
a. Test specimens shall consist of six hose assemblies, each with hose length between fittings of not
less than 24 inches (60.96 cm).
b. Two specimens shall be subjected to the proof pressure test (see 4.7.5) after each of the
incubation periods (30, 60 and 90 days) to determine conformance to 3.6.10.
4.7.14 Hot oil circulation (see 3.6.11). When type III hose assemblies are exposed to oil the hose
assemblies shall meet the requirements of 3.6.11. The following details shall apply:
a. Two untested type III hose assemblies shall be selected.
b. Oil conforming to viscosity grade 40 of MIL-PRF-21260 at a temperature of 300°F ± 5°F (148.89°C
± 2.7°C) , and at a pressure of 175 ± 25 psig (12.07 ± 1.72 bar) shall be continuously circulated
through the hose assemblies for 240 ± 1 hours in an ambient temperature of 75°F ± 10°F (23.89°C
± 5.55°C).
c. After the circulation test, specimens shall be bent around the applicable mandrel specified in table
XI with hose at a temperature of 75°F ± 10°F (23.89°C ± 5.55°C).
d. While bent around the specified mandrel, the specimens shall be proof-tested in accordance with
e. Specimens shall then be examined for internal or external leaks, ruptures, or cracks.
TABLE XI. Hot oil mandrel diameter.
Mandrel diameter
Hose size
inches (mm)
Fraction
Inches
Metric
1/8
.125
3.18
NA
3/16
.188
4.78
2.00 (50.80)
1/4
.250
6.35
2.25 (57.15)
5/16
.313
7.95
2.75 (69.85)
3/8
.375
9.53
NA
13/32
.406
10.31
4.62 (117.35)
1/2
.500
12.70
5.50 (139.70)
5/8
.625
15.88
6.50 (165.10)
3/4
.750
19.05
NA
7/8
.875
22.23
7.38 (187.45)
1-1/8
1.125
28.58
9.00 (228.60)
1-3/8
1.375
34.93
11.00 (279.40)
1-13/16
1.813
46.05
17.00 (431.80)
4.7.15 Salt spray testing (see 3.6.12). Fittings when subjected to corrosion resistance testing in
accordance with ASTM B633 shall and meet the requirements of 3.6.12. Duration of test 96 hours.
21
For Parts Inquires call Parts Hangar, Inc (727) 493-0744
© Copyright 2015 Integrated Publishing, Inc.
A Service Disabled Veteran Owned Small Business