DELUGE FIRE SPRINKLER SYSTEM
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.
A Water Spray System, for Fire Protection a different variant of Fire Sprinkler System. Such a system is used in places where fire is likely to rapidly spread out of control, within a short duration. Examples of such places, where Water Spray System, for Fire Protection are required are; Transformers, LPG bullets and Combustible fuels.
There are two variants of Water Spray System, for Fire Protection:
1) High Velocity Water Spray Systems (HVWS)
2) Medium Velocity Water Spray Systems (MVWS)
High Velocity Water Spray Systems (HVWS):
HVWS is generally used in oil based systems, having high flash points. The velocity of the water sprays, hitting the system under fire is critical for successful fire extinguishing action.
Medium Velocity Water Spray Systems (MVWS):
MVWS is generally used in oil based systems, having low flash points. The velocity of the water sprays, hitting the system under fire, if it is high, might actually spread the fire, and not extinguish it. Hence, the velocity of the water has to be in range.
Advantages of Water Spray Systems
- Extinguishes fires quickly and prevents fires from spreading over a large area.
- Minimises the damage caused by fire and reduces downtimes, protects the future of your business.
- High flexibility in design and implementation
- Reduces fumes and binds contaminants.
- Allows large open areas and thus a more flexible use of the premises.
- Uses water, a natural fire extinguishing agent that is available in unlimited quantities at a very low price.
High Velocity Water Spray System
A Deluge system (Automatic High Velocity Water Spray System) is a fixed fire protection system, which totally floods an area with pressurized water through a system of piping with open nozzles & sprinklers. The system piping is empty until the controlling valve is activated by a hydraulic or other types of release systems. Deluge valve has an inlet, outlet & priming chamber.
The inlet & outlet are separated from the priming chamber by the valve chamber & diaphragm. In the” SET “position, pressure is applied to the priming chamber through a restricted prime line .The pressure is trapped in the priming chamber & holds the clapper on the seat due to the differential area. When the pressure is released from priming chamber faster than it is supplied through the restricted priming chamber line, the clapper move & allow the inlet water supply to flow through the outlet into the system and associated alarm device.
Water spray System are installed to control fire & to provide cooling &/or exposure protection to such risks where extinguisher is always not possible or even desirable e.g. fire involving flammable fluids.
In case of fire the Quartzoid Bulb sprinkler shall burst at rated temperature due to heat which allow water in the detection pipe to drain out and in process allow the Deluge valve to open fully. As soon as the Deluge valve opens the water shall flow through the piping to flow water to all water spray nozzles mounted on the piping around the transformer. The water shall be sprayed in Hollow conical spray pattern to cover entire area of the transformer so that the fire on the transformer shall cool due to emulsification as well as fire get extinguish due to cutting off oxygen due to coverage pattern of the nozzle.
The fire shall be control and extinguished with the help of the H. V. water spray system.
The indication of operation of the system shall be available on the control panel with Alarming Siren.
Advantages of High Velocity Water Spray System
- Entire Transformer is flooded with water, which extinguish fire at earliest as well as avoid further destruction.
- Very quick in response.
- The fire losses is kept low as the area near fire get cooling due to water and so chances of spreading fire is negligible.
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