For best-in-class fire-fighting equipment, turn to Norfolk Fire & Security. Based in Wymondham, Norfolk, our company offers an extensive range of fire safety equipment, including fire extinguishers. In addition, we provide added safety measures in the form of effective emergency lighting.
A fire extinguisher is an active fire protection device that is used to extinguish or control small fires in emergency situation. Fire extinguishers are not intended for use on an out-of-control fire, such as one which has reached the ceiling, or one which endangers the user due to the lack of an escape route or the presence of smoke or an explosion hazard.
There are two main types of fire extinguisher: stored pressure and cartridge-operated. In stored pressure units, the expellant is stored in the same chamber as the fire-fighting agent itself. Depending on the agent used, different propellants are utilised. With dry chemical extinguishers, nitrogen is typically used. Water and foam extinguishers usually use air. Stored pressure fire extinguishers are the most common type.
Cartridge-operated extinguishers contain the expellant gas in a separate cartridge that is punctured prior to discharge, exposing the propellant to the extinguishing agent. This type is not as common and is used primarily in areas such as industrial facilities, where they receive higher-than-average use. They have the advantage of simple and prompt recharge, allowing an operator to discharge the extinguisher, recharge it, and return to the fire in a reasonable amount of time.
Unlike stored pressure extinguishers, cartridge-operated extinguishers use compressed carbon dioxide instead of nitrogen, although nitrogen cartridges are used on low-temperature models. Cartridge-operated extinguishers are available in water, wetting agent, foam, dry chemical, and dry powder types.