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Boeing 747SP Tank Inerting Efficiency Study: Vertical Mixing Impact

Explore the challenges and solutions for optimizing inerting efficiency in the Boeing 747SP fuel tank through vertical mixing analysis. This study conducted by William M. Cavage delves into the complexities of inerting and its impact on fire safety. Discover the findings and implications for future design considerations.

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Boeing 747SP Tank Inerting Efficiency Study: Vertical Mixing Impact

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  1. Boeing 747SP CWT Inerting Efficiency William M CavageProject Manager - Fuel Tank Inerting FAA AAR-440, Fire Safety R&D Branch June 13th-14th, 2002International Systems Fire ProtectionWorking Group CAA House - London, UK

  2. Vertical Mixing / Temperature Effects • Quiescent Full-Scale Testing has Indicated that Inerting of the 747SP in the Optimal Deposit Method Developed with the Plywood Model can be Problematic (No ACMs Operating) • Inerting Efficiency Different from Test to Test • Measured Strong “Vertical Effects” in one Full Length Bay • Bottom of Bay [O2] Lags Behind Top of Bay on Quiescent Tests • Complicated by the Fact that Sample System only Samples from Top • Preliminary Data Shows Effect is Not NEA Temperature Dependant but is Effected by the NEA Temperature AAR-422 Fire Safety R&D

  3. 747SP Inerting Data with Different Vertical Mixing 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 • Have Multiple Tests with Different Mixing AAR-422 Fire Safety R&D

  5. 747SP Calculated Inerting Curves with Different Vertical Mixing AAR-422 Fire Safety R&D

  6. Summary • Although the Bay-to-Bay Distribution of NEA Was Predictable and Repeatable, Inerting Efficiency Varied from Test to Test due to Problems with Vertical Mixing • When Vertical Mixing is Stimulated, Inerting of a Compartmentalized Tank with a Localized Deposit is very Repeatable • Care will Need to be Taken During Deposit System Design to Ensure Good Vertical Mixing in Deposit Locations AAR-422 Fire Safety R&D

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