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Hydrant System for Power Plant Fire Protection

Power Plant Fire Protection System (Part-II of III)

This section comprises of water based fire protection system called hydrant system in thermal power plants.
Flow Scheme for a Typical 660 MW Unit

Hydrant System

Hydrant system shall consist of a fire water ring main network of piping along with: Fixed Water Monitors (outdoor type) shall be provided for:

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Hydrant System for Power Plant Fire Protection

Hydrant System Requirements

Hydrant system requirements shall be designed keeping the following aspects of design in mind in line with the TAC requirements:

Spray System

The spray system works automatically. The deluge valves are operated and controlled by fire detection devices i.e. quartzite bulb detectors or by some other means of fire detection. The system could be pressurized till to the Deluge valves.
It covers all transformers located area, turbine and its auxiliaries, all oil storage tanks, cooling units and purifiers units. The equipment used in the whole system is spray pumps, the pressure controlling unit, variety of valves and strainers. There are two methods of spray system:
  1. High Velocity Water spray system (HVWS system)
  2. Medium Velocity Water spray system (MVWS system)

High Velocity Water Spray System (HVWS)

HVWS shall be designed as per TAC regulations. HVWS shall consists of above group piping, along with relevant fittings, deluge valves, isolation gate valves, spray nozzles, Quartzite bulb detector and pressure switches. HVWS system shall be equipped with the provision of automatically detect, control & extinguish any outburst of fire. The system shall allow hydraulically open the deluge valve thus allowing water to be sprayed on the equipment/area through projector nozzles in the form of a solid conical emulsifying spray.

Isolation gate valve and y-type strainer shall be provided on upstream and downstream side of the deluge valve. Fast acting butterfly valve shall be provided as a by-pass to deluge valve, so that this valve can be kept closed and can be operated manually in case of malfunction of deluge valve. High Velocity Water Spray System High Velocity Water Spray System The pressure at the hydraulically most remote point in the network shall not be less than 3.5 bars for outdoor transformers as per TAC.
Placing of spray nozzles shall be such that their spray nozzles should cones overlap each other.

Areas covered under HVWS are:


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