A Deluge Fire Sprinkler system is similar to a pre-action system except the sprinkler heads are open and the pipe is not pressurized with air. Deluge systems are connected to a water supply through a deluge valve that is opened by the operation of 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. Deluge systems are used in places that are considered high hazard areas such as power plants, aircraft hangars and chemical storage or processing facilities. Deluge systems are needed where high velocity suppression is necessary to prevent fire spread.
Deluge Fire Sprinkler systems protect extra hazard occupancies that require significant amounts of water to cool and control the growth or development of a fire. Typically, they are employed on hazards that contain low flash point flammable liquids or hazards with large amounts of combustible liquids. These types of hazards may include, oil extraction processes, transformers, tank or vessel protection, distillation processes. Water or Foam Deluge systems are used in the protection of large Aircraft Hangers as one primary means of fire protection.
High Velocity Water spray systems are installed to extinguish fires involving liquids with flash points of 650 C (1500 F) or higher.
Some of the worst fires which have occurred in the history of firefighting have been those involving oils and similar inflammable liquids. Unless promptly tackled at the source, such fires can rapidly grow to catastrophic proportions, often with irreparable damage to valuable plant.
Fires involving the heavier oils, with flash points above 650oC can be extinguished by properly applied fixed water spray systems.
Advance in technology have brought about much wider usage in industry of highly inflammable liquids, gases and solids. The fire problems so produced have required new thinking and development of new technologies. With fire risks involving the lighter oils, liquefied petroleum gases and other flammable liquids with flash points below 650 C it may not be possible or even desirable to extinguish the fire completely. Under such circumstances the aim is to achieve controlled burning. Adequate control of such fires and also protection of vessels and plant exposed to surrounding fire can be achieved by properly designed medium velocity water spray system.
Medium velocity water spray system has been developed and extensively installed for the following applications.For fire risks involving the lighter oils, liquefied petroleum gases, and other inflammable liquids, where it may not be possible or desirable to extinguish the fire completely.
For the protection of vessels, plant, and structures exposed to heat from adjacent and surrounding fires.