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MIL-DTL-83797 Hose, Rubber, Lightweight, Medium Pressure, General Specification ForThis specification covers the general requirements for hose, rubber, lightweight, medium pressure, with operating limits of -65 to 250 Degrees F and 200 to 1000 psi suitable for aircraft fuel and oil systems within the limits specified herein.

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MIL-DTL-83797C
d. All size assemblies shall not flatten or otherwise deform at any section more than 10 percent of the
outside diameter (OD).
e. While bent in this radius, a vacuum of 27 inches Hg (68.6 cm Hg) shall be applied to size -03
through -12, and 22 inches Hg (55.9 cm Hg) to sizes -16 through -32, and held for 5 minutes.
f. Application of vacuum shall not flatten or otherwise deform the hose an additional 10 percent of the
OD for sizes -03 through -24, and an additional 25 percent of the OD for size -32.
g. With the vacuum still applied, the assemblies shall be straightened and held in a horizontal position,
then gradually tilted 30 degrees in each direction, allowing the ball to roll through the hose
assembly.
h. After release of the vacuum, one assembly shall be dissected longitudinally and visually examined.
TABLE IX. Ball size for bending and vacuum test.
Diameter
Diameter
Dash
Dash
+.001
+0.03
+.001
+0.03
number
number
-.000 inch
-0.00 mm
-.000 inch
-0.00 mm
-03
.070
1.78
-12
.500
12.70
-04
.125
3.18
-16
.656
16.66
-05
.188
4.78
-20
.875
22.23
-06
.250
6.35
-24
1.125
28.58
-08
.313
7.95
-32
1.594
40.49
-10
.406
10.31
TABLE X. Bend radius
Bend
Bend
Hose
Hose
radius min
radius min
size
size
inches
(mm)
inches
(mm)
-03
1.75
44.45
-12
4.50
114.30
-04
2.00
50.80
-16
5.50
139.70
-05
2.25
57.15
-20
8.00
203.20
-06
2.50
63.50
-24
9.00
228.60
-08
3.50
88.90
-32
12.50
317.50
-10
4.00
101.60
4.7.8 Fuel immersion (see 3.5.8). Hose assemblies, when subjected to fuel immersion, shall meet the
requirements of 3.5.8. The following details shall apply:
a. The uncapped hose assemblies shall be immersed in fuel conforming to type JP-8,
MIL-DTL-83133 (JP-5, MIL-PRF-5624, may be used as an alternate) for 48 hours at a temperature
of 250°F ± 2°F (121°C ± 1.1°C).
b. After immersion, the assemblies shall be removed and, at room temperature, shall pass the proof
pressure test, with oil conforming to MIL-PRF-7808.
c. The assemblies shall then pass the inner tube bulge, straight coupling test.
d. The hose shall then be dissected longitudinally, and visually inspected.
"CAUTION: Use safety precautions. Fuel and oil under pressure and at high temperature may self ignite
or explode."
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