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Engine Nacelle Halon Replacement

This presentation discusses the simulation of Halon 1301 distribution in engine nacelle compartments using HFC-125. It includes technical notes, test cases, and methods to utilize this simulation for fire suppression systems. The ongoing testing of NOVEC-1230 against minimum performance standards is also outlined.

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Engine Nacelle Halon Replacement

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  1. Engine Nacelle Halon Replacement

  2. PRESENTATION CONTENTS • REVIEW EQUIVALENCE DATA TO DATE • HFC-125 SIMULATION • MINIMUM PERFORMANCE STANDARD TESTING - NOVEC 1230 • DISCUSS STATUS

  3. REVIEWING EQUIVALENCE DATA TO DATE

  4. REVIEWING EQUIVALENCE DATA TO DATE OTHER REPORTED or CALCULATED CONCENTRATIONS

  5. HFC-125 SIMULATION • HFC-125 CAN SIMULATE THE DISTRIBUTION OF HALON 1301 IN ENGINE NACELLE COMPARTMENTS • TECHNICAL NOTE PUBLISHED • DOT/FAA/AR-TN99/64, “Simulating the Distribution of Halon 1301 in an Aircraft Engine Nacelle With HFC-125” • INCLUDES BIBLIOGRAPHICAL REFERENCES • EXPLAINING THE PHYSICAL REASONING • TEST CASES • ADDITIONAL TEST CASE INCLUDED • DESCRIBES PROCEDURE TO UTILIZE THIS SIMULATION • TECH NOTE DID NOT ADDRESS AGENT STORAGE TEMPERATURE FOR COLD SOAK EVALUATION DURING CERTIFICATION TESTING • JAKOB (Ja) NUMBER USED TO ADDRESS THIS SHORTFALL

  6. HFC-125 SIMULATION • JAKOB (Ja) NUMBER(1) : • A MEASURE OF THE FRACTION OF A LIQUID THAT FLASHES TO VAPOR WHEN DEPRESSURIZED INSTANEOUSLY • Ja IS A RATIO OF : • THE DIFFERENCE IN ENTHALPY OF A LIQUID BETWEEN ITS NORMAL BOILING POINT & “AMBIENT” TEMPERATURE • HEAT OF VAPORIZATION AT THE NORMAL BOILING POINT • IN LIEU OF EVALUATING THE HEAT CAPACITY BY INTEGRATION, THE NUMERATOR CAN BE DETERMINED BY THERMODYNAMIC TABLE (1) Womeldorf, C.A. & Grosshandler, W.L., “Fire Suppression System Performance of Alternative Agents in Aircraft Engine & Dry Bay Laboratory Simulations”, NIST SP890, November 1995, Vol. 2, p.591

  7. HFC-125 SIMULATION • TO MATCH THE HFC-125 TEMPERATURE TO -65°F (-54°C) HALON 1301 • DETERMINE Ja OF HALON 1301 AT “AMBIENT” = -65°F (-54°C) • INSTANT DEPRESSURIZATION OCCURS WITHIN PLUMBING • PLUMBING WILL TEND TOWARD THE AGENT STORAGE TEMPERATURE • USE THIS Ja AND SOLVE FOR THE PROPER HFC-125 STORAGE TEMPERATURE • THERMODYNAMIC INFORMATION IS AVAILABLE FROM THE MANUFACTURER (DuPONT) • REMAINING PORTIONS OF THE SIMULATION PROTOCOL SHOULD BE FOLLOWED • FILL THE HALON 1301 BOTTLE WITH A MASS OF HFC-125 = 77% OF THE HALON MASS • CAPTURE THE GAS DISTRIBUTION TEST AS AN HFC-125 TEST • EVALUATE THE HFC-125 BEHAVIOR AS YOU WOULD HALON 1301

  8. HFC-125 SIMULATION • EXAMPLES FOR USING HFC-125 AS A SIMULANT AND OBTAINING APPROVALFOR THE HALON 1301 NACELLE FIRE SUPPRESSION SYSTEM • FAA/BOEING, SEPTEMBER 2003 • BOEING 777-300ER • GE 90-115B • USAF/LOCKHEED MARTIN AEROSPACE, SPRING 2006 • C-5 (background on program athttp://www.airforce-technology.com/projects/c5/) • GE CF6-80C2

  9. MINIMUM PERFORMANCE STANDARD TESTING - NOVEC 1230 • RUNNING NOVEC 1230 AGAINST THE MINIMUM PERFORMANCE STANDARD FOR ENGINE NACELLE/APU COMPARTMENTS (MPSe) • TESTING STARTED 11APRIL2006 • AIRBUS, SIEMENS, & 3M SUPPORTING THE PROJECT • INTENDED AIRFRAME : AIRBUS A350 • IF SUCCESSFUL, OTHER AIRBUS AIRFRAMES MAY BE CONSIDERED FOR THIS MATERIAL • INERTING GAS CONCENTRATION DATA FOR NOVEC 1230 • REFERENCE NFPA 2001 (2004 EDITION), TABLE A.5.4.3 • METHANE (CH4) = 8.8%v/v • PROPANE (C3H8) = 8.1%v/v

  10. MINIMUM PERFORMANCE STANDARD TESTING - NOVEC 1230 • NACELLE TASK GROUP WILL BE ASKED IN THE NEAR FUTURE FOR COMMENTARY REGARDING THE SPECIFICATION OF THE AGENT DISCHARGE DURATION • SPECIFICATION IS BASED LOOSELY ON HALON 1301 & CLOSELY ON HFC-125 & CF3I BEHAVIORS • DURATION = 1.0 +/- 0.5 SEC FROM STORAGE PRESSURE TO 100 PSIG • THE INTENT OF THE SPECIFICATION WAS/IS TO : • KEEP THE TEST METHODOLOGY SIMILAR OVER TIME • TO PREVENT LARGE DISPARITY FROM HALON PERFORMANCE • WORK WITH BROMOTRIFLUOROPROPENE (2-BTP) IN 2004 : • SUGGESTED A CONFLICT WITH THE SPECIFICATION • CONFLICT DID NOT REQUIRE RESOLUTION • CONFLICT AGAIN APPEARS WITH NOVEC 1230

  11. HOT WIRE ANEMOMETER (HWA) INLET AIR FLOW AGENT INJECTION ~ 15 FEET DIAMETER~2 FEET SPRAY FIRE ZONE FIREX PRESSURE TRANSDUCER DIAMETER~3 FEET ~ 10 FEET ~ 55 FEET ID~2 FEET / OD~4 FEET 3 HP (2.2 kW) ELECTRIC BLOWER APPROACH DUCT TEST SECTION MINIMUM PERFORMANCE STANDARD TESTING - NOVEC 1230

  12. MINIMUM PERFORMANCE STANDARD TESTING - NOVEC 1230 QUANTITIES DISCHARGED : => 3.6 lbf HALON 1301 => 8.8 lbf NOVEC 1230 NOTE VARIATION : => IN DISCHARGE DURATION => OF HWA BEHAVIOR (FIRE?!) 1 bar = 14.5 psi 1 m = 3.28 ft

  13. CURRENT STATUS • NEED TO COMPLETE : • NOVEC 1230 MPSe TESTING • DRAFT MPSe & OBTAIN COMMENT FROM TASK GROUP • HFC-125 OVER-PRESSURE CHARACTERIZATION • CF3I MPSe TESTING • WRITE/PUBLISH REPORT & MPSe • MPSe TO BE APPENDIX MATERIAL IN FINAL REPORT • REPORT BODY TO DESCRIBE HISTORY & LESSONS LEARNED • DRAFT REPORT DUE SEP 2006

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