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Federal AviationAdministrationClass C Cargo
Compartment ULD Suppression Agent Penetration Test
Second IMLBTCMAudience>
Harry Webster, FAA Fire Safety Br.
September 9, 2014
Federal AviationAdministration
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Purpose
• To determine the infiltration rate of Halon 1301 into a standard LD3 ULD.
• “Quick Look”, more rigorous tests to follow
Federal AviationAdministration
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Background
• Halon 1301 has been shown to be effective in suppressing the electrolyte fire associated with lithium-ion cells in thermal runaway.
• Halon 1301 has been shown to be an effective explosion suppressant.
• The effectiveness of the agent is predicated on the agent concentration and proximity to the fire.
Federal AviationAdministration
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Why this is an issue
• Lithium-ion battery fires originating in ULD’s may not be exposed to the full concentration of Halon 1301.
• Potential for the explosive build up of unburned electrolyte gases.
Federal AviationAdministration
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Test Setup
• Measure Halon concentration – Inside the environmental chamber– Inside the closed LD3– 20” above the floor
• Volumes– Chamber volume: 284 cubic feet– LD3 volume: 160 cubic feet
Federal AviationAdministration
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Test Setup
Federal AviationAdministration
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Results
• Test 1– Initial chamber concentration: 12.33%– Time to 5% concentration in LD3: 7:11 minutes
• Test 2– Initial chamber concentration: 8.93%– Time to 5% concentration in LD3: 11:04 minutes
Federal AviationAdministration
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Additional Tests• Tests will be
conducted to measure the ability of Class C cargo compartment fire suppression agent to penetrate into standard AKE cargo containers.
Federal AviationAdministration
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Additional Tests
• Aluminum AKE containers with flexible door coverings have been ordered. These types of containers are typical of what is used in many Class C cargo compartments.
• FE25 (HFC-125) will be used as a surrogate gas for Halon 1301. Gas concentrations will be measured in the compartment outside of the containers and within the containers
Federal AviationAdministration
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Additional Tests
• Variables include– Container loading– Simulated battery fire
• Pressure pulse• Temperature
Federal AviationAdministration
Questions?
Contact Information
Harry Webster
FAA William J Hughes Technical Center
Atlantic City, NJ
609-485-4183
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