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ALTERNATIVE AGENT UPDATE

ALTERNATIVE AGENT UPDATE. Louise C. Speitel Fire Safety Branch AAR-440 FAA W.J. Hughes Technical Center Atlantic City International Airport, NJ 08405. OUTLINE. _________________________________________________. Task Group Report on Halon Options Agents Under SNAP Internal Review

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ALTERNATIVE AGENT UPDATE

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  1. ALTERNATIVE AGENT UPDATE Louise C. Speitel Fire Safety Branch AAR-440 FAA W.J. Hughes Technical Center Atlantic City International Airport, NJ 08405

  2. OUTLINE _________________________________________________ • Task Group Report on Halon Options • Agents Under SNAP Internal Review • New Agents • NFPA 2001 Standard: Proposed Update for 2003 • CF3I Discharge Testing at –40º C in Cold Aircraft Engine Nacelle Simulator

  3. TASK GROUP REPORT ON HALON OPTIONS _________________________________________________ • “Options to the Use of Halons for Aircraft Fire Suppression Systems- 2002 Update” • Published February 2002, Update of 1995 and 1996 reports • Summarizes all aspects of aircraft fire suppression technologies relating to halon replacement for : engine nacelles lavatory trash receptacles cargo compartments hand-held extinguishers • Topics include: Chemical, physical, toxicological and environmental properties and considerations, alternative technologies, FAA requirements, current regulatory status, test results, agents and manufacturers • http://www.fire.tc.faa.gov/reports/report1.stm

  4. AGENTS UNDER SNAP INTERNAL REVIEW _________________________________________________ • NOVEC 1230- C6 Perfluoroketone- (3M) C2F5C(O)CF(CF3)2 - Streaming (nonresidential) & Flooding • H Galden Hydrofluoropolyethers- (Ausimont) Mixture of polymeric and oligomeric hydrofluoropolyethers- streaming -(nonresidential) • HFC-227-BC: FM200 with NaHCO3- (Kidde Dual Spectrum – for army)- total flooding- interim armored vehicles-separate cylinders- come out together • Goodrich 244- powdered aerosol-pyrotechnically generated- contains bromide salt • EPA anticipates publishing final decisions in early 2003

  5. NEW AGENTS _________________________________________________ • Contains bromine, chemically acting • Similar efficiency to Halon 1211 and Halon 1301 by mass • Toxicity similar to Halon 1211: NOAEL=0.5% for both • Drop-in replacement for Halon 1211-handhelds • Total flooding in non occupied areas • Kidde Research & Advanced Agent Working Group • Further toxicity testing is required • BTP is currently only available via laboratory-scale custom synthesis Bromotrifluoropropene (BTP): CH2CBrCF3

  6. ENVIRONMENTAL DATA AND PHYSICAL PROPERTIES _________________________________________________

  7. NFPA 2001: NORMALLY OCCUPIED SPACES _________________________________________________ • As of Jan 2002, the EPA does not set use conditions - Deferred to latest version of NFPA 2001 • PBPK modeling translates 5 minute dog LOAEL cardiotoxic concentrations to LOAELSafeHuman concentration-time response curves with a built-in safety factor (2 standard deviations) • The current standard allows the system designer to use LOAELSafeHuman concentrations up to the LOAEL. Means must be provided to limit the exposure to the corresponding time. • Proposed update to standard: Vote in 2003- Allows only 5 minute LOAELSafeHuman concentrations of agent (with exceptions). LOAEL can be exceeded. • More conservative and scientifically based than current standard

  8. NFPA 2001 NORMALLY UNOCCUPIED SPACES _________________________________________________ • The current standard allows the system designer to use LOAELSafeHuman concentrations. Means must be provided to limit the exposure to the corresponding time. Concentrations can exceed the LOAEL • Proposed Update to Standard: Vote in 2003- No change in wording.

  9. NFPA 2001 (2003) STANDARD: TOXICITY _________________________________________________________ Permitted in Occupied Areas • for n-Heptane = Cup Burner Conc. X 1.3

  10. CF3I DISCHARGE TESTING AT –40º C _________________________________________________ • Testing in a cold aircraft engine nacelle simulator • Entire facility housed in environmental test chamber • The temperature of the agent and the airflow temperature have a significant effect on agent dispersion • Dispersion of CF3I was not very effective: Peak concentrations as much as 4x lower • This research was conducted under DOD’s Next Generation Fire Suppression Technology Program • Program Manager: Dr. Richard Gann (NIST) • http://www.bfrl.nist.gov/866/HOTWC/title/title.htm

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