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March 12th-13th, 2002 International Systems Fire Protection Working Group Seattle, Washington

An Overview of FAA Fuel Inerting Research. March 12th-13th, 2002 International Systems Fire Protection Working Group Seattle, Washington. Vertical Mixing / Temperature Effects.

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March 12th-13th, 2002 International Systems Fire Protection Working Group Seattle, Washington

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  1. An Overview of FAA Fuel Inerting Research March 12th-13th, 2002International Systems Fire Protection Working GroupSeattle, Washington AAR-422 Fire Safety R&D

  2. Vertical Mixing / Temperature Effects • Quiescent Full-Scale Testing has Indicated that Inerting of the B-747 SP in the Optimal Deposit Method Developed with the Plywood Model can be Problematic • Inerting Efficiency Different from Test to Test • Measured Strong “Vertical Effects” in one Full Length Bay • Bottom of Bay Lags Behind Top of Bay on Most Tests • Complicated by the Fact that Sample System only Samples from Top • Observed Stratification of Inert Gas at Least Once with No Temperature Variation Between the Inert Gas and the Ullage • Developed Deposit Gas Heat Exchanger to Study Temperature Effects • Developed Inerting Efficiency Coefficient to Compare Tests • Back Calculate VTEs between 1.2 and 2.0 to reach 8% [O2] with 95% AAR-422 Fire Safety R&D

  3. Full-Scale B-747 SP Inerting Data AAR-422 Fire Safety R&D

  4. Inerting Efficiency • Due to Sample Lag Don’t have a Good Picture of Inerting in the Tank During Test • Sample Biased Due to Location of Sample Ports • Know Beginning Point (20.9) and End Point After Run ACMs • Want to Approximate the Progression of Tank Oxygen Concentration During the Testing • Use Generic Inerting Equation to Develop Efficiency Factor K • Solve for K and Redimensionalize to Get a Curve for Each Test Result • Did Several Tests with Different Temperature NEA AAR-422 Fire Safety R&D

  5. Full-Scale B-747 SP Inerting Data AAR-422 Fire Safety R&D

  6. Ancillary Equipment Development • Cross-Flow Reduction Device • Wrote and Distributed RFQ to Qualified Contractors for Developing a Cross-Flow Reduction Device for a B-747 SP • Three Phase Development to Optimize One of Three Proposed Concepts, then Design and Fabricate a Part for Kit Installation • OBGI Deposit System • FAA Developing a Method for Distributing the OBGI System Gas by Using Scale Plywood Tank Testing • RFQ for Development and Prototype in mid March AAR-422 Fire Safety R&D

  7. Flammability Survey of B-747 SP • Measured Heating and Flammability Parameters in CWT of Full-Scale Test Article During “Typical” Ground Operation with Low Fuel • Inert Tank Before Each “Ground Sit” (During Test) • Target Different Temperature Days (Relatively Constant Ambient Temperature) with Mild Weather • Run ACMs for 3 Hours to Make Cabin Comfortable • Thermocouples in Pack Bay, Ullage, and Fuel (and Sump) as well as On Walls, Floor, and Ceiling • All Data Obtained on Cool and Warm Days • Need Heat of Summer and Cold of Winter Data AAR-422 Fire Safety R&D

  8. B-747 SP Flammability Data AAR-422 Fire Safety R&D

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