Fire extinguishers are useful tools that prevent a fire from spreading. Such devices prove to be the call of the day by cutting the supplies of oxygen by brute force, or by forming a blanket around the flames. Fire alarms are also useful as they can sense potential fire damage.Have a look at Source for more info on this.
Fire extinguishing devices, also known as fire suppression systems, are compatible with fire alarm systems and smoke detectors, in compliance with a legal clause-NFPA 13. There are basically two types of fire suppressant systems: Wet Fire Sprinklers and Gaseous Agents.
Wet fire sprinklers spray water when the signs of a spread of fire have been observed, such as smoke or elevated ambient thermal temperature compared to normal room temperature. Each such sprinkler has a highly sensitive glass bulb attached by a metal (as it is a good conductor) to the sprinkler. Each sprinkler works independently with other sprinklers and thus enables water supply to the affected area. The liquid within the bulb is expanding due to excessive heat, and as a result, the bulb’s glass breaks. The bulb color shows the fire propagation power. The lamp, for example, gets an orange or red colour, at normal temperature. At 120 Celsius high temperatures the bulb’s color is violet. It is turning black at temperatures even higher, say 300 Celsius. Wet fire sprinklers are automatic fire extinguishing systems which once properly set up need not be operated manually. ESFR sprinklers (Fast Response to Early Suppression) are the best of their kind. They are used widely in the corporate sector, schools, malls, large halls, theatres, hospitals and some bungalows as well. These are however more costly than the extinguishers of the modern day.
Gaseous agents require either the use of extremely active agents or non-reactive inert gasses that are expelled through solid propellant gas generators. It works on any of these principles: · Remove the fuel that triggers the fire.
- Oxygen removal to stop burning, and fire spread.
- Heat reduction with agents such as Novec 1230
The gaseous fire extinguishing devices are dealt with in two ways. The first approach is to add it straight to the flames. There are no walls around the affected site. This method is called application locale. One way of using this is through the drainage method. This demands that the place be vacated, and is surrounded by physical barriers. This intensifies the gaseous agents in the specific three-dimensional area, and more effectively prevents the spread of fire.
Nonetheless, two measures should be kept in mind: Barotraumas-a pressure is generated due to excessive intensification of the gaseous agents. Some inert gasses such as argon can also crack walls and windows because of the impact.