MIL-PRF-24755B(SH)
NOTE:
The fan-motor section material (1-foot by 2-foot by 6-foot duct) is exposed for 15 minutes to a hexane fire capable
of temperatures between 1400 to 1600 °F. The sealing flanges are to be cooled by a water spray. The air pressure
shall be monitored with time. The fire tray is 18 inches by 30 inches, filled with hexane fuel floating on water. The
fire tray is oriented so that the longer side is perpendicular to the longitudinal axis of the duct. Five thermocouples
are used to monitor the temperature:
#1
Thermocouple:
Under side of the duct in the middle, just above the fire.
#2
Thermocouple:
Inside the duct, in the middle.
#3
Thermocouple:
Along the side of the duct.
#4
Thermocouple:
On top of the duct, in the middle.
#5
Thermocouple:
About 2 feet above the duct, in the middle.
FIGURE 3. Fifteen-minute fire test with hexane fuel.
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