Fire extinguishers manufactured with non-cylindrical pressure vessels also exist, but are less common. In the United States, fire extinguishers in all buildings other than houses are generally required to be serviced how to operate fire extinguisher pdf inspected by a fire protection service company at least annually. Some jurisdictions require more frequent service for fire extinguishers. There are two main types of fire extinguishers: stored-pressure and cartridge-operated.
Depending on the agent used, different propellants are used. 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, 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.
Cartridge operated extinguishers are available in dry chemical and dry powder types in the U. Handheld extinguishers weigh from 0. Fire extinguishers in a museum storeroom, cut to display their inner workings. A glass grenade-style extinguisher, to be thrown into a fire. A US copper building type soda-acid extinguisher. A US building-type chemical foam extinguisher with contents.
Bell Telephone CO2 extinguisher made by Walter Kidde, 1928. Du Gas cartridge-operated dry chemical extinguisher, 1945. Ansul Met-L-X cartridge-operated dry powder fire extinguisher for class D fires, 1950s. It consisted of a cask of fire-extinguishing liquid containing a pewter chamber of gunpowder. This was connected with a system of fuses which were ignited, exploding the gunpowder and scattering the solution. This device was probably used to a limited extent, as Bradley’s Weekly Messenger for November 7, 1729, refers to its efficiency in stopping a fire in London. A soda-acid extinguisher was patented in the U.
A vial of concentrated sulfuric acid was suspended in the cylinder. Depending on the type of extinguisher, the vial of acid could be broken in one of two ways. One used a plunger to break the acid vial, while the second released a lead stopple that held the vial closed. The pressurized water was forced from the canister through a nozzle or short length of hose. England in 1881, which used water or water-based solutions.