MIL-DTL-83797C
Inches
mm
0.5
12.7
1
25.4
NOTES:
1. Dimensions are in inches.
2. Metric equivalents are given for information only.
FIGURE 3. Cold temperature deflection test diagram.
4.7.11 Oil circulation test (see 3.5.11). Hose assemblies, when subjected to the oil circulation test,
shall meet the requirements of 3.5.11. The hose assemblies shall be installed in a test set-up similar to
that shown on figure 4. The test fluid shall be oil conforming to MIL-PRF-7808. The following test
sequence procedure, see figure 5, shall be performed.
a. Soak the assemblies with no pressure in a cold chamber, the temperature of which shall be
controlled at -65 ± 2 °F (-54°C ± 1.1°C), and maintained at this temperature for 1 hour.
c. Circulate the test fluid at a pressure of 70 psi (0.48 MPa) and at a flow rate not to exceed 15
feet a second. While circulating the fluid, increase the temperature of the test fluid to 250 °F±
10 °F (121°C ± 5.5°C), and increase the ambient temperature of 200 ± 10 °F (93°C ± 5.5°C).
d. Continue circulation for 20 hours. During the last hour of the 20-hour period, increase the test
fluid temperature to 375 ± 10 °F (191°C ± 5.5°C). Maintain this fluid temperature a minimum
of 15 minutes.
CAUTION: Use safety precautions. Fuel and oil under pressure and at high temperature may self
ignite or explode.
20
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