Halon-Green - This fire extinguisher is no longer legal except for a few exceptions such as the police and Aircraft. They are rechargeable and contain recycled Halon 1211 with Nitrogen as a propellant. They are used for fires class D.
Wet chemical fire extinguishers are designed for class F fires but are also effective for class A fires.
Types of fires:
Class A-Solids such as paper, wood, plastic.
Class B- Flammable liquids like petrol and oil.
Class C- Flammable such as propane, butane.
Class D - Metals such as magnesium, titanium.
Class E - Fires involving electrical apparatus.
Class F-Cooking oil & fat etc.
In our school there is a fire extinguisher in every science laboratory because many science experiments use fire.
Experiment making a fire extinguisher
- Put 2 spatula measures of aluminium sulphate into a beaker containing 30cm3 of water. Stir vigorously.
- Now add 2 spatula measures of sodium hydrogen carbonate to the other beaker and add 30cm3 of water to this. Stir vigorously.
- Pour the aluminium sulphate solution into the conical flask and add a few drops of washing up liquid. This is will make the fire extinguisher foam.
- Carefully add the contents of the other beaker to the conical flask. Put the bung and delivery tube on quickly and stand back. Make sure you direct the jet into a sink.
After I have finished making the foam extinguisher foam came out of the
delivery tube.
A fire sprinkler discharges water when there is a fire. The water is discharged when a certain temperature is reached (usually 165F). A fire sprinkler controls the fire and helps to put it out.
Fire sprinkler systems are usually used in houses, buildings, shops, hotels and others.
A fire sprinkler system is supplied with water from a water supply which provides sufficient pressure and flow rate to a water piping system which supplies the water to the fire sprinkler. The fire sprinkler is connected to the water supply.
On a sprinkler there is a certain temperature set. When this temperature is reached the bulb inside the sprinkler is broken because of the pressure. The fire sprinkler then discharges water.
Fire doors are used in buildings, and they prevent fire and smoke from spreading to the room. They are different from normal doors as they are heavier and automatically close. They are also fireproof and the wall around them usually is as well.
An evacuation chair is used by physically disabled people in the case of a fire. They are very light to make them easier to carry, and are also safer.
Lifts cannot be used in the case of a fire as the electricity could be cut off and the lift could get stuck, which could be dangerous.
I have seen a demonstration of how a disabled pupil would get down the stairs on an evacuation chair if there was a fire in the building.
In the Stevenson building in our school there are 3 evacuation chairs on each floor. On each floor there is also a refuge point.
I have compared a map of our school and another business. In our school every door is a fire door and in the other business there are two fire doors and one normal door. In our school there are fire blankets in the bistro, canteen, science rooms and some technology rooms. In the business I compared there are no fire blankets. In our school there are fire extinguishers in most rooms and corridors. In the business I compared our school with there is a fire extinguisher by every fire door.
Sites I have used:
Google images
