MIL-DTL-24688A
APPENDIX B
B.5.1.3 Gas concentrations. Gas analyzers shall provide a continuous monitoring of O2, CO, and CO2
concentrations of gases in the exhaust hood. The oxygen concentration shall be measured via a paramagnetic
oxygen analyzer while the CO and CO2 concentrations shall be measured via infrared process analyzers.
B.5.1.4 Smoke. Three light/photocells or equivalent instruments shall be used to assess the smoke production
within the compartment. The path length shall be 3.3 feet, and they shall be placed horizontally at 3.84, 5.35, and
6.56 feet above the deck and near the center of the compartment. One light/photocell assembly or equivalent
instruments shall also be used to assess the smoke production within the exhaust duct.
B.5.1.5 Target array. In order to assess the potential for the duct insulation materials to cause secondary
ignitions due to melting, dripping, or falling pieces, a target array of wood excelsior shall be placed on the deck of
the compartment beginning 1 foot away from the edge of the gas burner, under the horizontal duct run, and extend
the full length and width of the horizontal portion of the duct configuration.
B.5.1.6 Weight loss. In order to assess the amount of insulation consumed during the test, each duct shall be
weighed prior to insulation being applied, weighed in its final insulated test configuration, and weighed at the
conclusion of the test.
B.5.1.7 Heat release rate. The heat release rate of the fire inside the compartment shall be measured. A
hood/exhaust system shall be used to capture all of the exhaust gases exiting from the room doorway. The exhaust
system shall be instrumented so as to measure the heat release rate based on oxygen depletion calorimetry.
B.5.1.8 Data collection. Data obtained during the test shall be recorded at intervals not to exceed 5 seconds.
B.6 DOCUMENTATION
B.6.1 Video. Full test video shall be taken during each test. The camera shall be located outside of the
compartment vent providing a full view of the test array. When necessary, the camera may be relocated to
document unusual test developments.
B.6.2 Photographs. A series of photographs shall, as a minimum, be taken before and after each test showing
the arrangement of the test configuration.
B.6.3 Damage sketches. In order to more effectively show the extent of duct insulation damage, post-test
sketches shall be made of each tested configuration. This may involve the removal of the exterior lagging (when
required) and exposing and measuring the damaged insulation.
B.7 INSTALLATION OF TEST MATERIALS
B.7.1 Installation of test materials. The duct insulation shall be installed on both ducts. The insulation shall
also be installed on the bottom of the vertical riser section. All butt joints and seams shall be sealed using the
appropriate adhesives. Figure B-8 shows an elevation view of a typical installed insulation. If laggings/adhesives
are used, then the cure time as specified by the manufacturer shall be allowed prior to testing.
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