ONLINE ELECTRICAL ENGINEERING STUDY SITE

Fire Detection and Alarm System

Introduction of Fire Detection and Alarm System

Fire detectors are designed to detect one or more of the three characteristics of fire-smoke, heat and flame. Besides it every fire detection system must include manual call points (break glass), so that in the event of fire can be of immediate help.
During a fire importance of activation of the occupants through alarm or bell is of at most vital and this can performed through alarm system. fire alarm panel Fire alarm system shall be designed to provide round the clock security against fire in the complete power plant area.

Microprocessor based addressable analogue type fire alarm and detection system to be used for various building/areas to detect and provide alarm signal in the main fire alarm panel to be located in the central control room. Fire alarm will be repeated in a repeater alarm panel in the fire station.
Main fire alarm panel annunciation shall be located in the control building. A repeater panel shall be provided in the fire station. Total no of annunciation shall be based on the specific plant requirement.
One (1) siren of 10 Km range is envisaged to provide warning in the event of fire.
In addition to it, PLC panel shall be provided at fire pump house and foam pump house.

Why Fire Detection and Alarm System Required

Fire detection and protection system is required for the following reasons:
  • To detect fire in the area during the initial stage.
  • To alert occupants, so that they escape the building safely.
  • Summon trained personnel to take charge of controlling the fire as quickly as possible.
  • To initiate automatic fire control and suppression system.
  • To support and supervise the fire control and suppression system.

Type of Fire Detectors

  1. Smoke Detectorsmoke detector
  2. Fire Detectorfire detector
  3. Heat Detectorheat detector

Area to be Covered under Fire Detection and Protection System

Sl. No.Fire Detection SystemArea to be Covered
1Smoke Detection System
  • Main plant control room
  • Control equipment rooms
  • Switch gear and battery rooms (including MCC/Control rooms of SG, Turbine and Generator switch yard
  • MCC/Control rooms of all the auxiliaries of BTG and BOP auxiliaries like Coal handling plant, Ash handling plant, Compressed air plant, Fuel oil plant, Raw water/fire water pump house, CW pump house, Water treatment plant, Effluent treatment plant, HVAC system, Chemical treatment plant and other miscellaneous pump house.
  • Switch gear/MCC control rooms
2Linear heat sensing cable detection system
  • Cable galleries
  • Coal Conveyors
  • Fuel oil tanks
3Quartzoid bulb heat detection system
  • Equipment protected by HVW spray system and fuel oil tanks
  • Fuel oil tanks
  • Fuel skids and pump houses protected by MVW spray system.
4Infra-red Detectors
  • For all conveyors (one near the head end of each conveyor and the other mid way between the head and tail pulley shall be provided)

Design Philosophy of Fire Detection and Alarm System

  1. The PLC based control panel at pump houses shall indicate the status of each pump, system pressure, operation of hydrant or spray system, failure of starting of pumps, healthiness and failure of batteries/chargers, main supply, low level/very low level of water in the water supply system, status of compressors, selection station of batteries and chargers of panels and diesel engines etc. Alarms from these panels shall also be available at fire station in a repeater panel and at main fire panel alarm in control room.
  2. The PLC based addressable type panels at central Control rooms shall receive signal from sensor from various areas/equipments of the respective units.
  3. The Microprocessor based addressable panel shall evaluate the signals received from detectors, transmit the fire or trouble alarms (audio-visual) to prearranged points, supervise and monitor the complete fire detection and extinguishing circuits, initiate control functions like closure of fire doors, shutdown of draft fans, air conditioning and ventilation plant/equipment, closure of fire dampers in A/C and ventilation system etc. Opening smoke extraction vents, switching on smoke extraction equipment emergency lighting, tripping of transformer lockout relays etc.
  4. All the circuits from the detectors to the panels and the circuits from the panels to the actuating devices (such as solenoid valves, deluge valves, push buttons etc) shall be in closed loop type and in close watch for open-and-short-circuiting.
  5. Facilities shall be provided on the main fire alarm panel for sensitivity adjustment, isolation of detectors etc from the panel.
  6. Panel of fire detection, alarm monitoring and annunciation system shall operate on DC-supply, along with associated rectifier bank. Further each panel shall have the provision for batteries for charging.
  7. Each set of battery shall have the capacity for a period of 12 hours from the instant of charger/AC failure.
  8. Exit signs shall be painted o 18 gauge cold rolled sheet steel. This sheet should be suitable for fixing on walls or hanging from ceiling. Fire Exit/No Fire Exit shall be displayed on both sides of the Exit signs.




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