Fault of Electric Cable
Energy Bands in Crystals
Gallium Arsenide Semiconductor
Atomic Energy Levels
Electric Pressure Cooker
Power Plant Fire Protection System
Hydrant System for Power Plant Fire Protection
Medium Velocity Water Spray or MVWS System for Fire Protection
Foam Fire Protection System
Fire Detection and Alarm System
Gas Extinguishing System
Steam Boiler | Working principle and Types of Boiler
Methods of Firing Steam Boiler
Fire Tube Boiler | Operation and Types of Fire Tube Boiler
Water Tube Boiler | Operation and Types of Water Tube Boiler
Steam Boiler Furnace Grate Firebox Combustion Chamber of Furnace
Feed Water and Steam Circuit of Boiler
Boiler Feed Water Treatment Demineralization Reverse Osmosis Plant Deaerator
Coal Combustion Theory
Fluidized Bed Combustion | Types and Advantages of Fluidized Bed Combustion
Steam Condenser of Turbine
Jet Condenser | Low Level High Level Ejector Jet Condenser
Surface Steam Condenser
Economics of Power Generation
Cooling Tower Useful Terms and Cooling Tower Performance
Cooling Tower Material and Main Components
Electric Power Generation
Power Plants and Types of Power Plant
Thermal Power Generation Plant or Thermal Power Station
Hydro Power Plant | Construction Working and History of Hydro power plant
Nuclear Power Station or Nuclear Power Plant
Diesel Power Station
Why Supply Frequency is 50 Hz or 60 Hz?
Economiser in Thermal Power Plant | Economiser
MHD Generation or Magneto Hydro Dynamic Power Generation
Cogeneration | Combined Heat and Power
Thermoelectric Power Generators or Seebeck Power Generation
Cost of Electrical Energy
Gas Turbine Power Plant
Solar Energy Solar Electricity
Solar Energy System | History of Solar Energy
Types of Solar Power Station
Components of a Solar Electric Generating System
What is photovoltaic effect?
Staebler Wronski Effect
Working Principle of Photovoltaic Cell or Solar Cell
Characteristics of a Solar Cell and Parameters of a Solar Cell
Solar Cell Manufacturing Technology
What is a Solar PV Module?
What is Standalone Solar Electric System?
Steam Dryness Fraction
Superheated Steam and Steam Phase Diagram
Vapour Properties Mollier Chart Heat Capacities
What is Steam Flashing?
How to Calculate Steam Consumption During Plant Start Up
Effective Steam Distribution System
What is Water Hammer?
Engineering Thermodynamics Part 1
Science of Engineering Thermodynamics Part 2
Basic Law of Conservation and First Law of Thermodynamics
Carnot Cycle and Reversed Carnot Cycle
Enthalpy Entropy and Second Law of Thermodynamics
Rankine Cycle and Regenerative Feed Heating
Rankine Cycle for Closed Feed Water Heaters and Rankine Cycle Cogeneration
Ideal Verses Actual Rankine Cycle
Rankine Cycle Efficiency Improvement Techniques
Basic Wind Energy
Wind Turbine | Working Types and History of Wind Turbine
Theory of Wind Turbine
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 SystemHydrant system shall consist of a fire water ring main network of piping along with:
- Isolation gate valves installed above ground on RCC pedestals around areas to be protected.
- Hydrant valves (external/internal)
- Hose cabinets
- Branch pipe
- Nozzles and water monitors along with all accessories.
- Other accessories like MS painted hose box shall be provided as per TAC.
- External hydrants Hose houses or hose boxes shall be located all around the periphery of buildings and internal hydrants “hose box” shall be provided at each landing floor of staircases through above ground main.
- ESP areas,
- Boiler house
- Tall building
- Coal stock pile area
- Bunker building
- Junction tower/transfer towers and
- Other areas in the coal conveyor at locations where water can’t reach from hydrant system.
Hydrant System RequirementsHydrant system requirements shall be designed keeping the following aspects of design in mind in line with the TAC requirements:
- The hydrant network shall be sized to ensure that about 3.5 Kg/cm2 pressures are available at the hydraulically remotest point (as per TAC) in the system with the hydrant pump discharging the flow at rated pump capacity and head.
- The velocity in the hydrant main shall not exceed 5.0 m/s.
- At least two hydrants shall be provided with separate ring main for the main plants.
- Spacing of each outdoor hydrant shall be provided 45 meters distance. The internal hydrant/landing valves shall be provided 45 meters distance in case of TG halls, Mill bay, Boiler and other area 30 Meters distance at each floor space.
- Building shall be deemed to be protected by a hydrant if the hydrant is within 15 meters of the building.
- Each of the landing valves and external hydrant valves associated with the main plant like transformer yard, TG building and Boiler area to be provided with a hose box.
- Each ring mains to be terminated with an isolation valve and a blind flange at all the corners to enable future expansion/modification.
- Fire water booster system pump head shall be designed for farthest top most point of the boiler and pressure will be tested at that elevation.
- All the landings of boiler staircase, turbine buildings and other multi-storied structures, coal handling plant transfer points/junction towers, crusher house, bunker floors and other auxiliary buildings/non-plant buildings shall be provided with landing valves with hose box including the hose reels.
Spray SystemThe 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:
- High Velocity Water spray system (HVWS system)
- 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. 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:
- All oil filled Generator transformers and its surrounding areas.
- Unit auxiliary transformers.
- Unit transformers.
- Station auxiliary transformers.
- Stand-by maintenance transformers.
- Bus reactors.
- CHP auxiliary transformers.
- AHP auxiliary transformers.
- Station transformer (transformer rating 10 MVA and above).
- All type of oil storage tanks.
- Oil coolers and purifiers unit.
- Boiler's burner and its surroundings.
- Turbine Lube oil storage tanks and Turbine Oil purifier.
- Clean and dirty lube oil tanks.
- Boiler Feed Pumps lube oil tanks, coolers, consoles etc.
- Turbine Oil canal pipelines in main plant.
- Fuel Oil Pressurizing and Heating Units