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MIL-DTL-24688 Insulation, Thermal And Acoustic Absorptive, Cellular Polyimide FoamThis specification covers thermal and acoustic absorptive cellular polyimide foam insulation for use on bulkheads, overheads, and ventilation ducting. This specification also covers preformed thermal pipe insulation for use on piping operating at temperatures up to 600 degrees F in shipboard applications \(see 6.1\).

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MIL-DTL-24688A
APPENDIX B
B.5.1.1 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. Temperatures shall also be measured
along the vertical and the horizontal runs of the ducts (see B.5.1.2). All of the thermocouples shall be a maximum of
24 gauge, Type K, thermocouples. Each thermocouple shall have a bare bead.
B.5.1.2 Flame spread. Along with visual observations, flame spread may be assessed using thermocouples
along the entire simulated duct array. The thermocouples shall be installed along both the vertical and horizontal
portions of the duct assembly as shown on figures B-6 and B-7. All of the thermocouples shall be a maximum of
24 gauge, Type K, thermocouples. Each thermocouple shall have a bare bead.
FIGURE B-7. Vertical trees ­ TS X and TL X.
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