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Fire Control by Todd Iremonger

Fire Control by Todd Iremonger. Developed by Todd Iremonger, 2001 Adapted by CCTD, 2012. Objectives. Identify characteristics of LPG vs. Natural Gas Identify standard extinguishing methods for them Identify hazards associated with electricity. Control of Gas Utilities. Natural Gas

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Fire Control by Todd Iremonger

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  1. Fire Controlby ToddIremonger Developed by Todd Iremonger, 2001Adapted by CCTD, 2012

  2. Objectives • Identify characteristics of LPG vs. Natural Gas • Identify standard extinguishing methods for them • Identify hazards associated with electricity

  3. Control of Gas Utilities • Natural Gas • LPG - Liquefied Petroleum Gas

  4. Natural Gas • Mostly methane • Nontoxic • Classified as asphyxiant • Odor - Butyl Mercaptin is added • Explosive concentrations 4-14% • Pressure ranges from 1/4 to 1000 psi • Pressure is usually below 50 psi

  5. Liquefied Petroleum Gas • Mainly propane • Non-toxic • Odor added • 1.5 times heavier than air • Explosive concentrations 1.5 to 10% • Gas is shipped in cylinders and tanks

  6. Incidents involving distribution system • Most often caused by excavation • Approach and stage from upwind side • Evacuation is first concern • Eliminate ignition sources in area • Do not attempt to operate main valves • If burning, do not extinguish • Exposures should be protected if necessary

  7. Service meter • Flow stopped by turning the cutoff valve • Use hoseline for protection

  8. Suppressing Class C Fires • Primary danger of electrical fires is the failure of FF’s to recognize the hazard. • Commercial and high rise buildings, power is necessary to operate elevators and /or air handling equipment so the entire building should not be unilaterally deenergized. • Once power has been shut down, fires may self-extinguish or become class A or B fires.

  9. Bulk electrical transmission lines • An area equal to a span between poles should be cleared on either side of the break. • Transformers have coolant liquids that may contain PCB’s. These liquids are flammable and may be carcinogenic. • Transformers at ground level - Dry Chem. • Transformers above ground - Let burn

  10. Warning • Stop the flow of electricity to the object involved before initiating fire suppression activities. • Consider all wires live until confirmed to be otherwise by the power company.

  11. Underground Lines • Most common hazard is explosions. • Accumulation of gases ignited by spark • Keep public clear and don’t park apparatus over a manhole. • Do not enter except to attempt a rescue. • Firefighting can be done from outside. • Discharge Dry chemical or Carbon Dioxide and replace cover.

  12. Commercial High-Voltage Installations • Water should not be used. • Toxic chemicals, coolants smoke is a real hazard. • If rescue is required, search with clenched fist or back of hand to prevent reflex actions of grabbing live equipment which may be contacted.

  13. Electrical Power Shutoff • During structural firefighting ops., power should be turned off as soon as practical. • Firefighters do not pull electricity meter. • Control power at panel box initially. • Emergency Generators - pulling meter does not shut off all power.

  14. Electrical Emergencies • Never look directly at arcing electrical lines • All wires treated as energized • Do not cut electrical wires • Use approved insulated tools • Use care in raising/lowering ladders • Proceed carefully where wires are down • Mark downed line with appropriate tape, inform command and on scene crews

  15. Electrical Emergencies • Do not touch vehicles in contact with lines. • Solid or straight streams must not be used. • Special considerations for fences. If line is in contact the entire fence becomes charged.

  16. REVIEW

  17. Which of the following statements involving a pipe break in a natural gas line is not correct? 1) First concern, evacuate around break and downwind. 2) If gas is burning, extinguish the flame. 3) FF’s should not operate main valves. 4) FF’s may stop flow of gas into a building by turning cutoff valve.

  18. 2. If the gas is burning, FF’s should extinguish the flame.Firefighters shouldn’t extinguish the flame from LPG or Natural Gas until the supply has been shut off.

  19. At fires involving electrical transformers and broken transmission lines, FF’s should ________. 1) Allow transformers to burn themselves out. 2) Clear an area equal to the height of the pole. 3) Extinguish ground level transformers with dry chemif safe 4) Determine if the lines are energized or not

  20. 4) Determine if the lines are energized.Firefighters should not determine if the lines are energized or not. Leave this to Clark Public Utilities. Some lines may become energized upstream from the break if they are laying across power lines.

  21. During structural fire fighting ops, it is desirable for electrical power _______. 1) To remain on until FF’s are out of bldg. 2) Shut off as soon as fire personnel arrive. 3) Remain on until bldg. becomes damaged enough to interrupt electrical service 4) Shut off unless absolutely needed.

  22. 4) Shut off unless absolutely neededElectrocution is a life threatening hazard that should be mitigated as soon as possible.

  23. Identify the following characteristics as those of LPG, natural gas, or both.

  24. Has no natural odor.

  25. Both

  26. Is lighter than air.

  27. Natural gas

  28. Is nontoxic.

  29. Both

  30. Has a distinctive odor added to it.

  31. Both

  32. Is explosive in concentrations between 4-14%.

  33. Natural gas

  34. Is classified as an asphyxiante

  35. Both

  36. Is distributed from gas wells to its points of usage by a nationwide network of surface and subsurface pipes.

  37. Natural gas

  38. Is about 1 1/2 times as heavy as air.

  39. LPG

  40. Is explosive in concentrations between 1.5-10%.

  41. LPG

  42. Is stored in tanks and cylinders near its point of usage.

  43. LPG

  44. Is used primarily as a fuel gas in campers, mobile homes, and rural homes.

  45. LPG

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