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Power Plant Fire Protection System

Published on 24/2/2012 & updated on Thursday 19th of July 2018 at 07:19:24 PM
With the advent of industrialization the demand for power is also on the surge like never before. But augmenting without giving the due consideration for Fire protection and detection system would be detrimental and should not be done.
Thermal Power Plants are classified under the ordinary Hazard Occupancy as per Tariff Advisory Committee (TAC) of India. The design and installation of complete fire protection system shall comply with the regulations of TAC. In the absence of TAC regulations, the National Fire Protection Association (NFPA) standard shall be adopted. The system should be designed in such a manner that it is acceptable to approving statutory body (like TAC) for insurance companies of India and enable an owner to obtain the maximum rebate on its insurance premium.

Thermal Power Plants are characterized by their complex overall system made of a range of different operating modules. In addition to these conditions such as extremely hot surfaces, lubricating oils and coal and coal dust pose huge fire risks. Elements of Fire Protection System is covered in this Portion of Part-I. This section comprises of following which broadly are the elements of the fire protection system:

Fire Water Reservoir or Fire water Pump House

Water pump house plays an important role in fire protection system, so the complete fire pump arrangement shall be in line with the requirements of TAC. Water storage tank is required for storage of water and water will be drawn as and when required for fire protection. All the fire pumps should work automatically by use of Pressure switches; however stopping of all the fire pumps shall be manual only. The possible sources of supply of water to storage tank will be from two different sources:

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Power Plant Fire Protection System

The fire water storage tank shall be provided with two equal compartments and both the compartments shall be interconnected through separate isolation valve and each compartment shall be connected to a common suction header of fire water pumps so that any fire pump can be fed by either fire water storage compartment as per TAC regulations. At least two (2) headers shall be taken out of pump house for making loops around various risks. Each loop shall be interconnected for better reliability of the system. To isolate the system due to damage/repair, suitable nos. of gate valve should be provided.

Pumps Installed in Fire Water Pump House

Dedicated fire water pumps shall be provided for the fire hydrant and spray system. Blind flange with valve connection for future expansion shall be provided in the fire hydrant and spray system network. The installed fire water pump capacity and head shall be designed as per system requirement/TAC recommendations.

Following are the fire water pumps installed in the fire water pump house:

  1. Electric motor driven main fire water pump.
  2. Diesel engine driven pumps
  3. All diesel engine driven pumps shall be provided with 2 × 100% battery chargers and batteries.
  4. Electric motor driven fire water jockey pumps (one working and one stand by).
  5. Air compressor for pressurizing hydro-pneumatic tank.

Fire Water Pumps Data Sheet

For selection of rated capacity, rpm and material construction are:
S.No.DescriptionElectric Motor driven pumpDiesel engine driven pumpJockey pump
1.0General Information
1.1Rated Capacity/NosContractor to decide (minimum 3 nos.) for hydrant cum MVWS system and minimum 1 no for HVWS systemContractor to decide (minimum 2 nos. for hydrant cum MVWS system and minimum 1 no for HVWS system)Contractor to decide
1.2Rated speed (rpm)150015002900
1.3Total head at the pump discharge MWCAs per system requirementAs per system requirementAs per system requirement
1.4TAC approval requiredyesyesyes
1.5Used for service likeHydrant and spray systemHydrant and spray systemCommon for Hydrant and spray system
2.0Material of construction
2.2ImpellerStainless steelStainless steelStainless steel
2.3ShaftStainless steelStainless steelStainless steel

Control and operating philosophy

Fire water ring main network shall be a pressurized system provided with automatic starting of fire water pumps. The mode of operation of fire water pumping system for following shall be described in Part-II and III.

Constructional requirements

Hydrant System

(is covered in part-II)

Spray System

(is covered in part-II)

Fix Foam system

(is covered in part-III)

Potable and mobile extinguisher

(is covered in part-III)

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