Q:What types of spirnkler systems are their?
A:WET SYSTEMS: The most common sprinkler system, is a series of hydraulically calculated pipes which are charged with water. Each sprinkler head has a heat sensitive component which, when a certain temperature is reached, will allow water to flow through the head. Sprinkler heads can be rated for different temperatures, which is determined by the environment in which they are placed.DRY SYSTEMS: In a dry system there is no water in the pipes connected to the sprinkler heads. The air in the pipes is under pressure created by a pump. This pressure holds back a flapper in the dry valve which has water on the other side. When sufficient heat is applied to a sprinkler head the air is released and the flapper allows water to flood the system. This system is used mostly in unheated areas where the water would freeze in the pipes, such as in garage and attic areas, etc.PRE-ACTION SYSTEMS: These are a modified type of dry system where a fire alarm system is used to trigger the water flow. The usual configuration is a cross zoned type which has the following operation. The area to be protected has two types of detector... a heat and a smoke. When either is tripped into alarm the panel registers this however the second type of detector must also be alarmed before the water is allowed to flood the system. Water may still not flow if a sprinkler head has not been triggered. This type of system is used in areas which are likely to sustain heavy damage due to water, such as a computer room, electrical room or library.
Q: Do sprinklers go off accidently?
A: It is possible for a sprinkler to discharge spontaneously.But this is an extremely rare occurrence in systems which are properly maintained.Records indicate that only 1 in 16,000,000 sprinklers per year will open without cause.
Q:Do sprinklers cause widespread water damage?
A:Fire department hoses typically discharge ten to one hundred times more water than that discharged by sprinklers.Since only the sprinkler closest to the fire is activated.The total amount of water is limited.Fire damage is also limited most fires are put out quickly by relatively few sprinlers in areas with fully functional sprinkler systems.