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Module3 - Extinguishing Fires

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Module3 - Extinguishing Fires

  1. 1. Extinguishing fires by Jasmine Rivera & Amanda Warren Module 3
  2. 2. Fire Extinguishing agents <ul><ul><li>Water </li></ul></ul><ul><ul><li>Carbon Dioxide (CO2) </li></ul></ul><ul><ul><li>Multipurpose Dry Chemical </li></ul></ul><ul><ul><li>Halon 1301 </li></ul></ul><ul><ul><li>Halon 1211 </li></ul></ul>
  3. 3. Water <ul><li>Pros </li></ul><ul><li>Effective on Class A fires </li></ul><ul><li>Plentiful </li></ul><ul><li>Removes heat </li></ul><ul><li>Non-toxic </li></ul><ul><li>Inexpensive </li></ul><ul><li>Cons </li></ul><ul><li>May spread Class B fires </li></ul><ul><li>May carry pollutants in run-off water </li></ul><ul><li>Conducts electricity </li></ul><ul><li>Freezes in cold climates </li></ul>
  4. 4. Carbon dioxide (CO2) <ul><li>Pros </li></ul><ul><li>Effective on both Class B & C Fires </li></ul><ul><li>No residue </li></ul><ul><li>Relatively inert </li></ul><ul><li>Reduces oxygen to less than 15% </li></ul><ul><li>Cons </li></ul><ul><li>Toxic to humans >4% by volume </li></ul><ul><li>Dissipates rapidly-allows reflash </li></ul><ul><li>Not the best agent for deep-seated fires </li></ul>
  5. 5. Dry chemical <ul><li>Pros </li></ul><ul><li>Sodium bicarbonate (baking soda) </li></ul><ul><li>Very effective on Class B & C fires </li></ul><ul><li>Interrupts chemical reactions </li></ul><ul><li>Not considered toxic </li></ul><ul><li>Cons </li></ul><ul><li>Obscures vision </li></ul><ul><li>Absorbs moisture and may cake within </li></ul><ul><li>May be irritating </li></ul><ul><li>Not effective on deep-seated Class A </li></ul><ul><li>Leaves residue </li></ul>
  6. 6. Multipurpose dry chemical <ul><li>Pros </li></ul><ul><li>Effective on Class A, B & C fires </li></ul><ul><li>Interrupts chemical reactions </li></ul><ul><li>Non-conductive </li></ul><ul><li>Ammonium phosphate </li></ul><ul><li>Cons </li></ul><ul><li>More irritating then ordinary dry chemical </li></ul><ul><li>Obscures vision </li></ul><ul><li>Nozzle pressure may causing burning liquids to splash </li></ul>
  7. 7. Halon 1301 <ul><li>Pros </li></ul><ul><li>Bromotrifluoromethane </li></ul><ul><li>Removes heat </li></ul><ul><li>Non-toxic </li></ul><ul><li>Inexpensive </li></ul><ul><li>Cons </li></ul><ul><li>May spread Class B fires </li></ul><ul><li>May carry pollutants in run-off water </li></ul><ul><li>Conducts electricity </li></ul><ul><li>Freezes in cold climates </li></ul>
  8. 8. Halon 1211 <ul><li>Pros </li></ul><ul><li>Effective on Class A, B & C fires </li></ul><ul><li>No residue </li></ul><ul><li>Used in portable fire extinguishers </li></ul><ul><li>Interrupts chemical reactions </li></ul><ul><li>May be sprayed (boiling point: 25 degrees F) </li></ul><ul><li>Cons </li></ul><ul><li>Must be used at >5%by volume </li></ul><ul><li>Vapor density : 5.7 (collects in pits & low areas) </li></ul><ul><li>Toxic decomposition products are generated by fire </li></ul><ul><li>Production restricted currently due to depletion of ozone layer </li></ul>

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