MIL-DTL-6000D
4.8.4 Circulation (see 3.5.4).
4.8.4.1 High temperature - 200 hours (see 3.5.4.1). When subjected to 200 hours-high temperature
circulation test, the hose shall meet the requirement of 3.5.4.1. The following details shall apply:
a. A 9 inch (22.9 cm) or longer length of hose shall be used for this test.
b. Fitting ends shall be in accordance with SAE-AS5132 and hose clamps shall be in accordance
with NAS 1925.
c The hose clamp shall be tightened to 25 inch-pounds (2.8 Nm) torque initially.
d. Ethylene glycol in accordance with ASTM E1119 and oil no. 1 in accordance with ASTM
D471, shall be circulated through the hose for 16 hours followed by 8 hours of no circulation.
This shall be continued until 200 hours of circulation time is accumulated. An ambient
temperature of 140°F ±10°F (60°C ± 5.5 °C) shall be maintained during the circulation periods.
The hose clamp shall not be torqued more than three times during this test.
e. Ethylene glycol in accordance with ASTM E1119 shall be circulated through one hose while
maintaining a hose inlet pressure of 75 psig (5.2 bar) and a temperature of 286°F to 300°F
(141°C to 149°C).
f. Oil no. 1 in accordance with ASTM D471 shall be circulated through the second hose while
maintaining a hose inlet pressure of 50 psi gage and a temperature of 244°F to 261°F (118°C
to 127 °C).
g. Upon completion of the circulation test, the hose shall be proof pressure tested with water as
4.8.4.2 High temperature - 50 hours (see 3.5.4.2). When subjected to 50 hours high temperature
circulation test, the hose shall meet the requirement of 3.5.4.2. The following details shall apply:
a. A 9 inch (22.9 cm) or longer length of hose shall be used for this test.
b. Fitting ends, hose clamps, and torque shall be the same as specified in 4.8.4.1 except that the
hose clamp shall not be torqued more than four times during this test.
c. Ethylene glycol in accordance with ASTM E1119 shall be circulated through the hose for 50
continuous hours while maintaining a temperature of 286 to 300 °F (141 to 149 °C).
d. Upon completion of the circulation test subject the hose to burst pressure, with water as
specified in ASTM D380 (see 4.8.2.2) of the hose shall be determined and shall meet the
requirements specified in 3.5.4.2.
e. If the hose fails, two more samples shall be selected from the same length and tested. If
these samples fail the lot shall be rejected and corrective action shall be required, see 4.7.2.1.
4.8.5 Low-temperature flexibility (see 3.5.5). Hose when subjected to low temperature flexibility shall
meet the requirements of 3.5.5. The following details shall apply:
a. Hose of 1 inch and less (inside diameter) shall be tested by conditioning a straight piece of
hose at least 12 inches long in a cold chamber at -40°F ±4 °F (-40°C ±2°C) for 5 hours.
b. Within 2 seconds of removal from the cold chamber, the hose shall be bent around a cooled
mandrel having a diameter of 10 times the outside diameter of the hose.
c. Bending shall be completed within 1 second.
d. Hose over 1 inch (inside diameter) shall be tested in accordance with ASTM D380 at
-40 ±4 °F (-40 ±2 °C).
e. Requirements for hose of any inside diameter shall be as specified in 3.5.5.
4.8.6 Bend radii (see 3.5.6). A length of hose shall be bent so that the inside radius of the hose is
equal to 12 times the inside diameter of the hose and shall meet the requirements in 3.5.6.
4.8.7 Adhesion (see 3.5.7). The adhesion shall be determined in accordance with the Static-Mass
Method (for ring specimens) of ASTM D413 and shall meet the requirements specified in 3.5.7.
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