WORKING PRACTICES IN ENGINEERING Unit 1 FIRE CONTROL ---- EXTINGUISHERS.

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Presentation transcript:

WORKING PRACTICES IN ENGINEERING Unit 1 FIRE CONTROL ---- EXTINGUISHERS

FIRE SAFETY If you notice a fire call 999 immediately, evacuate the building and proceed to assembly point. Using the wrong fire extinguisher can result in making a fire worse! For electrical fires use a CO2 extinguisher.

FIRE SAFETY CONT.. For non-electrical fires use a water extinguisher. Always ensure that you know how to operate a fire extinguisher safely and do not attempt to tackle large fires.

Water Extinguisher Red Best For Fires involving organic solid materials such as wood, cloth, paper, plastics, Coal etc. Danger Do not use on burning fat or oil or on electrical appliances How to Use Point the jet at the base of the flames and keep it moving across the area of the fire. Ensure that all areas of the fire are out. How it Works Water has a great effect on cooling the fuel surfaces and thereby reducing the pyrolysis rate of the fuel

Dry Powder Extinguisher. (Multi-Purpose ) Blue Best For Can be used on fires involving organic solids, liquids such as grease, fats, oil, paint, petrol,etc but not on chip or fat pan fires. Danger Safe on live electrical equipment, although does not penetrate the spaces in equipment easily and the fire may re-ignite. This type of extinguisher does not cool the fire very well and care should be taken that the fire does not flare up again. Smoldering material in deep seated fires such as upholstery or bedding can cause the fire to start up again. Do not use on domestic chip or fat pan fires. How to Use Point the jet or discharge horn at the base of the flames and, with a rapid sweeping motion, drive the fire towards the far edge until all the flames are out. If the extinguisher has a shut- off control wait until the air clears and if you can still see the flames, attack the fire again. How it Works Similarly to almost all extinguishing agents the powders acts as a thermal ballast making the flames too cool for the chemical reactions to continue. Some powders also provide a minor chemical inhibition, although this effect is relatively weak. These powders thus provide rapid knockdown of flame fronts, but may not keep the fire suppressed.

Foam Extinguisher.(Standard) Cream Best For Fires involving solids. Liquids such as grease, fats, oil, paint, petrol,etc but not on domestic chip or fat pan fires. Can be used on class A fires but not recommended. Less effective than AFFF foam Danger Check manufacturer's instructions for suitability of use on other fires involving liquids. These extinguishers are generally not recommended for home use. How to Use Do not aim jet straight into the liquid. Where the liquid on fire is in a container, point the jet at the inside edge of the container or on a nearby surface above the burning liquid. Allow the foam to build up and flow across the liquid. Howit Works These are mainly water based, with a foaming agent so that the foam can float on top of the burning liquid and break the interaction between the flames and the fuel surface.

BLACK Best For Live electrical equipment when it is not possible to isolate the electric supply and flammable liquids such as grease, fats, oil paint, petrol etc. but not on domestic chip or fat pan fires. Danger Do not use on domestic chip or fat pan fires. This type of extinguisher does not cool the fire very well and you need to watch that the fire does not start up again. Fumes from CO2 extinguishers can be harmful if used in confined spaces: ventilate the area as soon as the fire has been controlled. How to Use The discharge horn should be directed at the base of the flames and the jet kept moving across the area of the fire. How it Works Carbon dioxide extinguisher works on classes B and C and works by suffocating the fire. Carbon dioxide will not burn and displaces air

Wet Chemical Canary Yellow Best For The specialist wet chemical extinguishers are ideal for Class F fires, involving cooking oils and fats, such as lard, olive oil, sunflower oil, maize oil and butter. Danger Check manufacturer's instructions for suitability of use. These extinguishers are not recommended for class B fires and home use. How to Use Apply the wet chemical using the extended applicator in slow circular movements, which give a gentle, yet highly effective application. Apply the fine spray onto the burning fat until the surface of the burning cooking oil changes into a soapy like substance, this then prevents re-ignition. The gentle application helps prevent hot oil splashing onto the user. How it Works Most class F extinguishers contain a solution of potassium acetate, sometimes with some potassium citrate or potassium bicarbonate. The extinguishers spray the agent out as a fine mist. The mist acts to cool the flame front, while the potassium salts saponify the surface of the burning cooking oil, producing a layer of foam over the surface. This solution thus provides a similar blanketing effect to a foam extinguisher, but with a greater cooling effect. The saponification only works on animal fats and vegetable oils, so class F extinguishers cannot be used for class B fires.