MIL-DTL-25579G
TABLE VIII. Vacuum test conditions.
Size
Nominal inside diameter (in) Negative pressure (in Hg)
-3/-4
0.188
28
-4
0.188
28
-5
0.250
28
-6
0.313
28
-8
0.406
28
-10
0.500
28
-12
0.625
20
-16Z
0.875
14
-20Z
1.125
10
-24Z
1.375
8
4.5.18 Pneumatic leakage (see 3.6.18). Hose assembles when subjected to pneumatic leakage in
accordance with SAE-AS2078 shall meet the requirements of 3.6.18.
4.5.19 Fire resistance (see 3.6.19). Hose assembles when subjected to fire resistance testing in accordance
with SAE-AS1055 type IIa, class A shall meet the requirements of 3.6.19.
4.5.20 Cleanliness (see 3.6.20). Both ends of the hose assembly shall be visually inspected to determine if
caps or plugs are installed at the fittings. For hose assembly with straight fittings at both ends, remove the
caps or plugs and place a light source at one end of the hose assembly. The interior of the hose shall be
visually examined, without magnification, from the opposite end of the light source. Conformance shall be as
specified in 3.6.20.
5. PACKAGING
5.1 Packaging requirements. For acquisition purposes, the packaging requirements shall be as specified in
the contract or order (see 6.2). When packaging of materiel is to be performed by DoD or in-house contractor
personnel, these personnel need to contact the responsible packaging activity to ascertain packaging
requirements. Packaging requirements are maintained by the Inventory Control Point's packaging activities
within the Military Service or Defense Agency, or within the Military Service's system commands. Packaging
data retrieval is available from the managing Military Department's or Defense Agency's automated packaging
files, CD-ROM products, or by contacting the responsible packaging activity.
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful, but is not
mandatory).
6.1 Intended use. The hose assembly covered by this specification is military unique to meet the
requirements specified herein and in the applicable specification sheets. The hose qualified in accordance with
MIL-DTL-27267 for field attachable fitting assemblies should be mated with either reusable fittings qualified in
accordance with MIL-DTL-27272 or with permanent fittings to meet the requirements specified herein and in
the applicable specification sheet. This hose assembly is a hydraulic or pneumatic conductor for a fluid at the
operating pressure, specified in table III, even under extreme temperature conditions ranging from -65°F to
450°F (275°F for class 2). The hose assembly is intended for use in high-temperature fuel, lubricating oil,
water-alcohol, chemical-fluid, hydraulic and pneumatic systems that allow some gaseous effusion through the
hose wall. However, hose assembly used in hydraulic and pneumatic systems should not exceed the
temperature limit of 400°F. Furthermore, it is recommended that this hose assembly should not be used in
pneumatic storage system applications and in any applications that exceed the operating temperature range
and pressure specified herein. Hose assembly sizes -20Z and -24Z should not be used in systems where the
peak pressures are greater than 1000 psi (7MPa). Hose assembly size -3/-4 is not intended for use in aircraft
hydraulic systems.
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