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Page Title: Summary of Fire Suppression Methods - Cont'd
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4.6.2  Summary of Fire Suppression Methods - Cont'd . d. Carbon Dioxide.  The carbon dioxide extinguisher holds liquid carbon dioxide under high pressure.  Extinguishers are made with both disk valves and seat valves.  The disk valve type releases the entire contents of the cylinder when it is opened.  The seat valve type, which has a control valve, permits only the desired amount of gas to be discharged. The  stream  should  be  directed  at  the  base  of  the  flames.    The  carbon  dioxide  extinguisher  may  be  used  on  electrical fires. e. Soda acid.  The soda acid extinguisher contains a solution of water and sodium bicarbonate and, in a separate bottle, an amount of sulfuric acid.  When the extinguisher is turned upside down, the chemicals are mixed and expelled under pressure through the hose.  This extinguisher must not be used on electrical fires. f. Dry Chemical.  The dry chemical extinguisher contains chemically processed bicarbonate of soda in a powder form.  Air or gas pressure contained either inside or outside of the extinguisher shell, is used to discharge the bicarbonate of soda.  In applying powder to flammable liquid fires, the stream should be so directed that the section of fire closest to the operator is extinguished first.  The operator should then gradually move forward, shifting the discharge nozzle from side  to  side.    Equipment  should  be  cleaned  after  fire  extinguishment  because  of  the  corrosive  nature  of  dry  powder extinguishing agents.  This extinguisher may be used on electrical fires. g. Inert Gas.  An inert gas, such as nitrogen, can be used in a confined space to extinguish the fire by displacing the oxygen.  Personnel cannot be in the same space.  Nitrogen may also be used to blanket a flammable liquid in a confined space to prevent ignition due to the displacement of air (oxygen). 4-6.3  Fire Extinguishers Supplied with TPT Each TPT is furnished with the fire suppression equipment defined in para. 2-4.13.  It is noted that there are two types of fire extinguishers: a. Nineteen (19) wheel-mounted combination dry chemical and foam extinguisher.  The mixing and motive force of the  extinguisher  is  supplied  from  compressed  nitrogen  bottles  carried  on  the  equipment.    The  foam  used  in  this extinguisher is called aqueous film forming foam (AFFF).  In general terms, the practice is to extinguish the fire with dry chemicals  and  then  prevent  reignition  with  the  AFFF  which  forms  a  film  over  the  extinguished  area.    Details  on  the operation of this equipment are contained in the U.S.  Marine Corps technical manual in Appendix A. b. Ninety-five  (95)  20  lb.    capacity  dry  chemical,  hand  carried,  fire  extinguishers.    These  are  intended  for  use  in extinguishing more minor fires. 4-6.4  Types of Fires and Suppression Action a. Electrical Fires.  When an electrical fire occurs, the first action is to shut off the current at a point away from the immediate switch controlling the equipment on fire.  If wires must be cut, only qualified personnel, with proper equipment, should  be  allowed  to  cut  them.    If  the  current  cannot  be  shut  off  immediately,  a  carbon  dioxide  or  dry  chemical extinguisher should be used to put out the fire.  For large fires, water fog can be used provided care is taken to not cause a solid stream of water under any conditions. 4-14

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