MIL-DTL-24688A
APPENDIX A
A.4 IGNITION SOURCE
A.4.1 Ignition source. The ignition source used for these experiments shall be the standard 30 lb (13.6 kg)
wood crib as outlined in the Uniform Building Code Standard 26 3 room/corner test procedure. The crib consists
of 1½-inch square fir sticks, cut to 15-inch lengths, and assembled into a 15-inch square plan with five evenly
spaced sticks per tier aligned perpendicular to the tier below. The construction shall use 8d common nails and
should consist of between 45-50 sticks such that the per-test weight of the wood crib should be 30±½ lbs. The final
crib assembly shall be conditioned to a moisture content of not greater than 8 percent. Inside the test compartment,
the crib shall be supported above the deck by 2 inches high by 4 inches wide metal supports or bricks. The crib shall
be placed in the test corner area such that it is 1 inch from the adjacent wall surfaces. The crib shall be ignited using
a 6-inch square pan containing 6.76 oz (200 milliliters [mL]) of heptane and placed under the center of the crib.
A.5 INSTRUMENTATION
A.5.1 Layout. A general layout of the instrumentation is shown on figure A-7.
FIGURE A-7. Plan view of instrumentation layout.
A.5.2 Temperatures. A vertical thermocouple tree shall be located in the center of the compartment. The tree
shall consist of 16 thermocouples located every 6 inches below the ceiling. A second thermocouple tree shall be
located in the vertical centerline of the vent. This tree consists of 13 thermocouples located 1, 6, 12, 18, 24, 30, 36,
42, 48, 54, 60, 66, and 72 inches below the top of the vent opening. All of the thermocouples shall be a maximum
of 24 gauge, Type K, thermocouples. Each thermocouple shall have a bare bead.
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