Engine Nacelle Halon Replacement

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Engine Nacelle Halon Replacement
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PRESENTATION CONTENTS

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

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REVIEWING EQUIVALENCE DATA TO DATE
Agent Ventilation configuration Fire Threat Equivalent Concentration (v/v)
HFC-125 High JP8 spray 17.5
HFC-125 High JP8 pool 7.6
HFC-125 Low OIL spray 16.4 (a)
HFC-125 Low JP8 pool 8.1 (a)
CF3I High JP8 spray 5.6
CF3I High JP8 pool Incomplete
CF3I Low OIL spray 7.2 (a, b)
CF3I Low JP8 pool Incomplete
(a) Bracketing method used to find mass equivalent (a) Bracketing method used to find mass equivalent (a) Bracketing method used to find mass equivalent (a) Bracketing method used to find mass equivalent
(b) Partial result, JP8 verification incomplete as of November 2005 (b) Partial result, JP8 verification incomplete as of November 2005 (b) Partial result, JP8 verification incomplete as of November 2005 (b) Partial result, JP8 verification incomplete as of November 2005
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REVIEWING EQUIVALENCE DATA TO DATE
OTHER REPORTED or CALCULATED CONCENTRATIONS
Agent Fuel Peak, Critical or Design Concentration (v/v) REFERENCE
CF3I PROPANE 6.5 (p) NFPA 2001, TABLE A-3-4.3
CF3I JP8 SPRAY 3.2 (c) NIST SP890, V.2, TBL 10, p.115
CF3I JP8 POOL 6.8 (c) NIST SP890, V.2, TBL 10, p.115
CF3I OIL 7.2 (d) FAATC none work in progress...
HFC-125 METHANE 14.7 (p) NFPA 2001, TABLE A-3-4.3
HFC-125 PROPANE 15.7 (p) NFPA 2001, TABLE A-3-4.3
HFC-125 PROPANE ?12.6 (p) NIST SP890, V.2, FIG. 41, p.78
HFC-125 JP8 SPRAY 8.7 (c) NIST SP890, V.2, TBL 10, p.115
HFC-125 JP8 POOL 12 (c) NIST SP890, V.2, TBL 10, p.115
HFC-125 JP8 SPRAY, LoVent 25.4 (d) AFRL-VA-WP-TR-1999-3068
HFC-125 JP8 SPRAY, HiVent 18.2 (d) AFRL-VA-WP-TR-1999-3068
HFC-125 JP8 17.5 (d) FAATC none work in progress...
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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

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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

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HFC-125 SIMULATION

• TO MATCH THE HFC-125 TEMPERATURE TO -65F (-54C)
  HALON 1301
• DETERMINE Ja OF HALON 1301 AT AMBIENT -65F
  (-54C)
• 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

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HFC-125 SIMULATION

• EXAMPLES FOR USING HFC-125 AS A SIMULANT AND
  OBTAINING APPROVAL FOR 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 at http//www.airforce-
  technology.com/projects/c5/)
• GE CF6-80C2

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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) 8.8v/v
• PROPANE (C3H8) 8.1v/v

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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

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