hose or hose assembly that is twisted during handling,
hydraulic or pneumatic hose installations. Do not use
removal, or installation can easily cause kinking.
oil of any type on self-sealing hose as an aid to
installation. Compatible oil, approved for the purpose,
PREINSTALLATION P RO C E D U R E S . --
may be used on all other types of fuel, oil, and coolant
Check hose or hose assembly before installing it to
hose installations.
make sure that identification bands and protective
closures are present as required after proof pressure
When you install or handle hose or hose
testing. Inspect hose for proper type and size, and for
assemblies, you can sustain injuries to your hands or
aging (signs of deterioration such as cracks,
damage to the hose if it is kinked. You should take care
discoloration, hardening, weather checking, or fungus).
to prevent situations where injuries or kinking can
Check the braid for two or more broken wires per plait,
occur. A hose that is bent to a smaller radius than
or more than six broken wires per linear foot. Inspect
specified might cause kinking. See table 10-7.
for broken wires where kinking is suspected. Evidence
A preformed hose assembly, or one that has
of internal restriction of tube due to collapse, kinking,
become set-to-shape of its operating position, is
wire-braid puncture, or other damage can be found by
straightened or handled without a protective restraint. A
Table 10-7.--Hose Minimum Bend Data
RUBBER HOSE
TEFLON HOSE
LOW PRESSURE
MED PRESSURE
MED PRESSURE
HIGH PRESSURE
MED PRESSURE
HIGH PRESSURE
MIL-H-5593
MIL-H-8794
LTWT MIL-H-83797
MIL-H-8788
MIL-H-27267
MIL-H-83298
MINIMUM
HOSE
MINIMUM
HOSE
MINIMUM
HOSE
MINIMUM
HOSE
MINIMUM
MINIMUM HOSE
HOSE
BEND
DASH
BEND
DASH
BEND
DASH
BEND
DASH
BEND
DASH
BEND
DASH
RADIUS
NO.
RADIUS
NO.
RADIUS
NO.
RADIUS
NO.
RADIUS
NO.
RADIUS
NO.
(INCHES)
(INCHES)
(INCHES)
(INCHES)
(INCHES)
(INCHES)
2
2.00
2
--
2
--
2
--
2
--
2
--
3
2.00
3
3.00
3
1.75
3
--
3
2.00
3
--
4
4.00
4
3.00
4
2.00
4
3.00
4
2.00
4
3.00
5
--
5
3.38
5
2.25
5
3.38
5
2.00
5
--
6
4.00
6
4.00
6
2.50
6
5.00
6
4.00
6
5.00
8
6.00
8
4.62
8
3.50
8
5.75
8
4.62
8
5.75
10
6.00
10
5.50
10
4.00
10
6.50
10
5.50
10
6.50
12
6.50
12
4.50
12
7.75
12
6.50
12
7.75
16
7.38
16
5.50
16
9.62
16
9.00
16
9.62
20
9.00
20
8.00
20
12.00
24
11.00
24
9.00
*16Z
7.38
*16Z
7.38
32
13.25
32
12.50
*20Z
11.00
*20Z
11.00
40
24.00
*24Z
14.00
*24Z
14.00
48
33.00
Z--Designated two stainless steel wire braids.
NOTE:
Bend Radius for MIL-H-600 and
MIL-H-7938 hose shall not be less
than 12 times the inside diameter of
the hose.
10-20
