Wet Sprinkler Systems
Wet pipe systems are the most common fire sprinkler system. A wet pipe system is one in which water is constantly maintained within the sprinkler piping. When a sprinkler activates this water is immediately discharged onto the fire. While it is a popular choice due to the ease of installation and matchless protection, it is not suited for all climates. The pipes in a wet pipe sprinkler system are always filled with water, they are at risk of freezing in environments that fall below 40°F.
Ideal Environments For Wet Sprinkler Systems Include:
- Industrial buildings
- Commercial buildings
- Retail buildings
- Residential facilities
*Mostly ideal environments if they do not store expensive electronics, documents, or art that a sprinkler discharge could destroy.
Dry Pipe Systems
These systems are specifically designed for buildings susceptible to freezing. Dry pipe sprinkler systems feature automatic and closed-type sprinkler heads connected to pipes filled with pressurized air or nitrogen. The compressed air holds a remote valve, known as a dry pipe valve, in a closed position. Located in a heated space, the dry-pipe valve prevents water from entering the pipe until a fire causes one or more sprinklers to operate. Once this happens, the air escapes and the dry pipe valve releases. Water then enters the pipe, flowing through open sprinklers onto the fire.
Ideal Environments For Dry Pipe Sprinkler Systems Include:
- Industrial warehouses
- Parking garages
- Loading docks
- Commercial freezers
- Residential attics
A Pre-Action fire sprinkler system is a combination of Wet Pipe and Dry Pipe Systems. Water is not stored in the pipes until a fire detection device senses a fire. When a fire is detected, the device opens a valve to let the water in before the sprinkler heads open. When the heads open, the pre-action fire sprinkler system reacts as quickly as a wet pipe system.
Ideal Environments For Pre-Action Sprinkler Systems Include:
- Archival Vaults
- Fine Art Storage Rooms
- Rare Book Libraries
- Computer Center
Often referred to as open sprinklers, deluge systems deliver large quantities of water over specified areas quickly. Deluge systems connect to a water supply through a deluge valve that opens by a smoke or heat detection system. The detection system is installed in the same area as the sprinklers. When the detection system is activated water discharges through all of the sprinkler heads in the system.
Ideal Environments For Deluge Sprinkler Systems Include:
- Power Plants
- Aircraft Hangars
- Chemical Storage or Processing Facilities
Foam is used whenever there is a possibility of a liquid fire. The Foam will mix with water and then expand over the liquid that is on fire, cool the fire, and will finally suffocate it.
Ideal Environments For Foam/Water Systems Include:
- Flammable Liquid Storage
- Loading Racks
- Processing Areas
- Aircraft Hangars
- Jet Engine Test Facilities
- LNG Storage/Manufacturing
- Marine Applications
Fire Pumps, Tanks & Reservoirs
FIRE PUMPS are needed when the local municipal water system cannot provide sufficient pressure to meet the hydraulic design requirements of the fire sprinkler system. Low water pressure usually occurs if the building is very tall, such as in high-rise buildings. It can also occur in systems requiring a relatively high terminal pressure at the fire sprinkler to flow a large volume of water, such as in storage warehouses.
TANKS OR RESERVOIRS are holding tanks used to provide water for a sprinkler system that demands more water than the domestic water supply line serving the building can deliver.
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