automatic sprinkler system Resources & Information - automatic sprinkler systems work

Sprinkler systems for fire protection consist of overhead pipes fitted with sprinkler heads. Each head is held closed independently by heat-sensitive automatic sprinkler system parts seals. These seals prevent water flow until a design temperature is exceeded by the cheap automatic sprinkler system individual sprinkler heads. Seals may be broken by melting (fusing) of metals with a low melting point (often bismuth alloys), or may be glass bulbs that break from pressure differences when heated. The bulbs are colour-coded to indicate their operating temperature; the table below is from New Zealand fire safety standards in degrees celsius:

Sprinklers have been in use in the United States since 1874, and were used in factory applications turning on the water for an automatic sprinkler system where fire losses at the turn of the century were often catastrophic in terms of both human and property losses. In the US, sprinklers are today required in all high rise and underground buildings generally 75 feet (23 m) above or below fire department access, where the ability of firefighters to provide adequate hose streams to fires is limited. Sprinklers may also be required in hazardous storage spaces by building codes, or may be required by insurance companies automatic sprinkler systems work where liability due to potential property losses or business interruptions can be reduced by adequate automatic fire protection. Building codes in the United States for places of assembly, generally over 100 persons, and places with overnight sleeping accommodation such as hotels, nursing homes, dormitories, and hospitals usually require sprinklers.

Typical sprinkler head activation temperatures are 135 °F (57 °C), 155 °F (68 °C), 200 °F (93 °C), and 286 °F (141 °C), which correspond to the type of hazard the sprinkler system protects against. Life safety hazards, such as residential history of automatic sprinkler system occupancies, use a lower (therefore quicker) activation temperature. automatic fire sprinkler system Each sprinkler activates independently. The design intention is to limit the total number of sprinklers that operate, thereby providing the maximum water supply available from the water source to the point of fire origin. Standard wet sprinkler systems are designed for 1500 square feet (140 m²), and maximum water supplies of about 300 US gallons per minute (20 L/s).

Typical "wet" systems are simple and passive, requiring no manual controls to activate, so long as adequate water supplies are provided. Specialty systems called "dry" systems, designed for unheated automatic sprinkler system spaces, have a low "maintenance" air pressure in the automatic sprinkler systems pipes, which can be displaced by water in the event that a sprinkler "fuses" automatic sprinkler system computer control allowing the maintenance air pressure to reach a minimum pressure point. "Pre-action" systems are highly automatic garden sprinkler system specialized for locations where accidental activation is unacceptable such as museums with rare art works, manuscripts, or books. Pre-action valves are connected to fire alarm initiating devices such as smoke detectors or heat detectors and virtually eliminate the possibility of accidental water flow. In the event that there is a fire, the fire, and the fire department's hose streams which provide around 250 US gallons per minute (15 L/s), will do more damage than sprinkler activation, generally around 14 US gallons per minute (1 L/s), per sprinkler. "Deluge" systems are used for special hazards automatic sprinkler system types where rapid fire spread is a concern. Deluge systems have open sprinklers, i.e. the fusible link is removed, so that every sprinkler served by the system will discharge water. This ensures a large and simultaneous application of water over the entire hazard.

Other specialty systems may have foam instead of water suppression agents for fire protection in occupancies with flammable liquids, such as airport hunter automatic sprinkler systems hangars. "Clean agent" gaseous systems, such as Argon/CO2/Nitrogen automatic sprinkler system repair mixtures can be used in very small spaces where water cannot be used for suppression.

Cost of sprinkler systems planning a automatic sprinkler system run from US$2 - $5 per square foot ($50/m²), depending on type and location, however specialty systems may cost as much as $10/square foot ($100/m²). Systems can be installed history of automatic sprinkler systems during construction or retrofitted. Some communities have laws requiring residential sprinkler systems, where large municipal hydrant water supplies ("fire flows") are not available. Nationwide in the United States, one and two-family homes generally do not require fire sprinkler systems, although the overwhelming loss of life due to fires occurs in these spaces. Residential sprinkler systems are relatively inexpensive (about the same per square foot as carpeting or floor tiling), but require larger water supply piping than is normally installed in homes, so retrofitting is usually cost prohibitive.

According to the National Fire Protection Association, fires in hotels with sprinklers averaged 78% less damage than fires in hotels without them (1983-1987). The NFPA says the average loss per fire in buildings with sprinklers was $2,300, compared to an average loss of $10,300 in unsprinklered buildings. The NFPA adds that there is no record of a fatality in a fully sprinklered building outside the point of fire origin. However, in a purely economic comparison, this is not a complete picture; the total costs of fitting, and the costs arising from non-fire triggered release must be automatic sprinkler system back flow preventor factored.

The NFPA states that it "has no record of a fire killing more than two people in a completely sprinklered building where a sprinkler system was properly operating, except in an explosion or flash fire or where industrial fire brigade members or employees were killed during fire suppression operations."

The world's largest fire sprinkler manufacturer is the Grinnell division of Tyco International, other manufacturers are Viking Sprinkler Co. and Reliable Sprinkler Company.

automatic sprinkler system

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