# Presentation: 854398

##     APPLICATION OF OZONE-SAVING FIRE SUPPRESSIVE AGENT 
    HALON 37 FOR CHARGING HAND-HELD ONBOARD EXTINGUIHERS

Vladimir O. Fonin

    		 AVIATION CERTIFICATION CENTER
     	OF STATE SCIENTIFIC-RESEARCH INSTITUTE OF CIVIL 	AVIATION 

*    ****HALON 37***** *****FOR CHARGING HAND-HELD ONBOARD EXTINGUIHERS***
***Vladimir O. Fonin***
***    ******	******	****** ****AVIATION CERTIFICATION CENTER*
*     **	**OF STATE SCIENTIFIC-RESEARCH INSTITUTE OF CIVIL **	**AVIATION*

## MAIN PROPERTIES of HALON 37 AND HALON 1211 [2-4]

|  | Halon 37 | Halon 1211 |
| --- | --- | --- |
|  | Colorless gas | Colorless gas |
| Relative molecular mass | 170 | 165,4 |
| Melting temperature, oC | -131 | -159 |
| Boiling temperature, oC | -18,3 | -3,8 |
| Liquid density at 20oC, kg/m3 | 1410 | 1830 |
| Minimum volume extinguishing concentration, % | 6,2 | 4,3 |
| Vapor pressure in balance at 20oC, KPa | 420 | 234 |

- The  fire  suppressive  agents – Halon 37  and  Halon 1211 - are  chemical compounds  of  the  one  and  the  same  class  of  the  halogen-containing substances.
- Halon 37 – С3F7H  does  not  contain  in  its  compound  the  atoms  of  Bromine  and  Chlorine  and  that  is  why it can be  considered  as  an  inert  chemical  compound  related  to  the  ozone  layer  of  the  Earth.
- Halon 1211 – CF2ClBr,  contrary, contains  in  its  compound  the  atoms of  Bromine  and  Chlorine  which  define  its  ozone-destructive  action.
- Table 1  provides  the  phisical-chemical  properties  of  Halon 37  and  Halon 1211  considered  during  designing  of  the  hand-held  extinguishers.

## TYPES OF MODELING FIRES

_**TYPES OF MODELING FIRES**_
- _“__A” class modeling fire –     _burning   of the non-metallic constructions
-             and   decorative-funishing      materials   like cloth, rubber, plastic, paper etc
- Two types of burning are possible:
- 	“A1” – open flame burning
- 	“A2” – smouldering fire
- _“__B” class modeling fire –    _burning of    liquid  fuels,    lubricating      materials
- and special    fluids.
- “A” class modeling fire is the fire of a package of 450х300х45mm size, containing
- several    layers   of   ПС-4   foam   plastic     and porous P-29   rubber    is used  having in   its   lower part   a through   hole   of   30 mm   diameter   to   locate   a   fuse   moist   with   aviation kerosene.
- The   compiled   package   was   installed   at   the   open   platform   in   the
- vertical   position  on   the   support   and   the   fuse   was   set   on fire.
- Suppression   was   made  by OP1-2,0-32-48 extinguisher with Halon 37.
- “B”   class   modeling   fire is the fire of   a  pan   of   standard   size 1400х700x100 mm  Is  used,  half of   the   square   of  which  is  filled  with  the   pieces  of ПС-4  foam   plastic   of 15 mm   width.   Four   or   five   liters of     aviation   kerosene are   poured  in   the   pan   and   set  on  fire.
- Suppression    starts   in   one   minute   after   kerosene   is ignited.
- Suppression   of  the   class ”B”   fire   was   performed   using OP2-6,0-32-48
- extinguisher  with Halon 37.

## 	LIMITATIONS AND RECOMMENDATIONS FOR Halon 37 USEAGE

	Demonstration  of  Halon 37  fire-suppressive  effectiveness  as  well  as  the analyses  of  its  phisics-chemical  properties  showed  the  principled  possibility  for  its  application  in  onboard  hand-held  extinguishers  only for  suppressing  the   initiated  fire  on  board  the  aircraft.

		As  for  its  fire  extinguishing  possibilities  the  ozone-saving  Halon 37  is  less effective  than  Halon 1211.  It  is  required  that  the  amount  of  Halon 37, necessary  to provide  of  the  same  fire-extinguishing  ability  should  be  twice  as  much  than  for  Halon 1211.

		The  onboard  hand-held extiguishers  filled  with Halon 37  are  applicable  for suppression  of class “A1”  and class “B”  modeling  fires  only  when  they  are at  their  initial  stage,  when  the  heat  generation  of  the  fire  point  is  not  as much and  it  allows  the  operator with  an  extiguisher  to  approach  to  the necessary distance of 1,5-2,0 meter.

		The onboard hand-held extiguishers with Halon 37 are  effective only for 
	suppression  of  the  smouldering modeling  class “A2”  fire.

		It  is  possible  to  use  onboard  hand-held  extinguishers with  Halon 37  without  increasing  their  quantity but  in this  case it is  necessary  to increase  the  number  of  the  extinguishers with  water-etilenglicol composition.

- 	Demonstration  of  Halon 37  fire-suppressive  effectiveness  as  well  as  the analyses  of  its  phisics-chemical  properties  showed  the  principled  possibility  for  its  application  in  onboard  hand-held  extinguishers  only for  suppressing  the   initiated  fire  on  board  the  aircraft.
- 		As  for  its  fire  extinguishing  possibilities  the  ozone-saving  Halon 37  is  less effective  than  Halon 1211.  It  is  required  that  the  amount  of  Halon 37, necessary  to provide  of  the  same  fire-extinguishing  ability  should  be  twice  as  much  than  for  Halon 1211.
- 		The  onboard  hand-held extiguishers  filled  with Halon 37  are  applicable  for suppression  of class “A1”  and class “B”  modeling  fires  only  when  they  are at  their  initial  stage,  when  the  heat  generation  of  the  fire  point  is  not  as much and  it  allows  the  operator with  an  extiguisher  to  approach  to  the necessary distance of 1,5-2,0 meter.
- 		The onboard hand-held extiguishers with Halon 37 are  effective only for
- 	suppression  of  the  smouldering modeling  class “A2”  fire.
- 		It  is  possible  to  use  onboard  hand-held  extinguishers with  Halon 37  without  increasing  their  quantity but  in this  case it is  necessary  to increase  the  number  of  the  extinguishers with  water-etilenglicol composition.