Types of fire Extinguisher

Fire Fighting

WATER:-

Advantages:-

  • Readily, plenty available
  • If 400 micron size, all three-cooling, smothering & prevention of radiation.

Disadvantage:-

  • Electricity
  • Damage to cargo and machinery
  • Stability, Need below Precautions  for Free surface effect: shifting of liquid a free space-change in position of CG, Grounding: Excess water-increases the draft, Grounding due to listing or trim of the vessel, Weight of water added , Weight of water pumped out, Water drained to other compartment, Weight of cargo totally burnt, shifted and moved, Weight of water absorbed by cargo like coal, cotton etc

Co2 :-

 Advantages

  • Non corrosive-1.5 times heavier than air.
  • Electrical conductivity
  • No residue
  • Not subjected to deterioration due long storage
  • Immediately available

Disadvantages

  • Asphyxiating
  • Little cooling effect
  • Solid CO2 may form static electricity when discharged forming incentive spark-may ignite flammable atmosphere.
  • Once used, can be filled with shore facility only.

 

 

FOAM :-

Advantages

  • Small layer of bubbles on the buring liquid surface, prevents fuel vaporizing
  • Prevents oxygen reacting with fire, After extinguishing, foam blanket has to be maintained, to cool off below ignition tempera Enclosed space
  • It can poured directly in to the space
  • Should be used for the entire space
  • When on fire water in the foam evaporates to give out steam which is more than the air in the foam
  • Considerable cooling property & shield against radiant heat.
  • Very effective on fire of low FP oil

Disavantages

  • NOT USE IN ELECTRICAL FIRE

DCP:-

Advantages :-

  • Very small particles of DCP is good for more area
  • If too small, 1. compacting takes place, 2. will not reach fire-operator has to move close.
  • On class A fire no sealing effect.
  • DCP may safely used on person whose cloth is on fire.
  • DCP has exceptional knock-down properties
  • Can be used on burning gas, over head liquid fire.
  • Some are good on metal fire
  • Un affected by extreme temperature

 

DISADVANTAGE

  • Minimum cooling effect-danger of re ignition.
  • May “cake” during storing.

 

HOW TO USE FIRE EXTINGUISHER EASILY?

the simple acronym P.A.S.S. to help you use the fire extinguisher effectively. P.A.S.S. stands for: Pull, Aim, Squeeze, Sweep, explained below the printable diagram.

  • Pull the safety pin from the handle. The pin is located at the top of the fire extinguisher. Once removed, it releases the locking mechanism, allowing you to discharge the extinguisher.
  • Aim the extinguisher nozzle or hose at the base of the fire. As explained, this removes the source or fuel of the fire. Keep yourself low.
  • Squeeze the handle or lever slowly to discharge the agent. Letting go of the handle will stop the discharge, so keep it held down.
  • Sweep side to side approximately 6in or 15 centimeter (5.9 in) over the fire until expended. The sweeping motion helps to extinguish the fire. Stand several feet or metres back from the fire: fire extinguishers are manufactured for use from a distance.

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