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FC 403, Standard for Fire Sprinkler Systems, November 1994

7. System Components

7.1 Types of Systems
  1. Unless otherwise approved by the FC, sprinkler systems in a building shall be of the wet-pipe type.

  2.  
  3. Wet-pipe systems shall be equipped with alarm check valves unless specifically approved by the FC.

  4.  
  5. A dry-pipe sprinkler system shall be provided where more than 20 sprinklers are located in a single unheated area. Either a dry-pipe system or an anti-freeze system shall be provided where 20 or less sprinklers are located in a single unheated area.

  6.  
  7. A dry-pipe sprinkler system shall be provided in all buildings where more than 25 % of the sprinklers are located in unheated portions of the building. Where less than 25 % of the sprinklers are located in unheated portions of a building, only those sprinklers shall be connected to a dry-pipe system, the remainder shall be connected to a wet-pipe system.

  8.  
  9. A deluge sprinkler system, with the approval of the FC, shall be provided in an area where the nature of the hazard is such to require that upon operation of the sprinkler system, water will be discharged from all open sprinklers simultaneously.

  10.  
  11. A pre-action sprinkler system, with the approval of the FC, may be provided in an area where: 
    1. the nature of the hazard is such that a more rapid operation than that of a dry-pipe sprinkler system is required, 
    2. the nature of the hazard is such to require an alarm or alert signal be transmitted prior to the operation of the sprinkler system, 
    3. the contents are highly susceptible to water damage, or 
    4. the sprinkler or sprinkler piping are subject to mechanical injury. 
  12. Non-fire systems such as energy integrated system may be connected to a sprinkler system subject to the approval by the FC. 
7.2 Valves
Individual indicating control valves shall be located in readily accessible locations where a portion of sprinkler systems protecting areas such as computer rooms, record storage rooms, cooking equipment and ductwork, rooms intended for hazardous operations or hazardous substances or other rooms where in the opinion of the FC there would be a serious water damage potential.

7.3 Pipes, Fittings and Hangers

  1. Combustible sprinkler pipes and fittings, such as chlorinated polyvinyl chloride (CPVC) and polybutylene pipes, are permitted to be used provided: 
    1. the occupancy is classified as light hazard occupancy classification, 
    2. the system is a wet pipe sprinkler system, 
    3. the system is located in an area where the ambient temperature is between 10 C and 50 C, 
    4. horizontal pipes and fittings are protected from the hazard below by a fixed fire separation having a fire resistance rating of not less than 15 min. (See Appendix A), 
    5. vertical pipes and fittings are located in a shaft and are separated from the remainder of the building by a fire separation having a fire resistance rating of not less than 45 min. (See Appendix A), 
    6. pipes and fittings are of a size not exceeding 3 NPS (nominal pipe size), and 
    7. pipes and fittings are listed and installed in accordance with the listing requirements of the certification organization. 
  2. Hangers shall not have sharp edges which may come in contact with combustible piping.

  3.  
  4. Hangers spacing and installation methods for combustible pipes shall be in accordance with the listing requirements for the pipe.

  5.  
  6. Pipes and fittings under air pressure shall not be buried underground unless the installation is approved by the FC. 
7.4 Sprinklers
  1. Fast response sprinklers shall be provided in areas with sleeping facilities and shall be installed in accordance with the listing requirements of the certification organization.

  2.  
  3. Special sprinklers including on-off sprinklers shall not be used unless specifically permitted by the FC. 
7.5 Alarms
  1. Inside and outside alarm signal devices shall be provided for the sprinkler system to indicate a water flow condition.

  2.  
  3. A water motor gong, where provided, may serve up to 3 sprinkler systems on a common riser.

  4.  
  5. Water motor gongs shall be located on an exterior wall of the building as close to the sprinkler valve as possible, but not more than 6 m above the valve and with a total length of pipe not exceeding 20 m.

  6.  
  7. Inside alarm signal devices for the sprinkler system shall be listed and includes electric gong, horn, bell and siren. 
7.6 Testing Facilities
  1. Facilities shall be provided to test: 
    1. pumping capacity (See Appendix A), 
    2. sprinkler water flow alarms at each floor, and 
    3. pressure regulating equipment serving more than 1 storey in a high building. 
7.7 Other Components
  1. A quick opening device shall be provided for a dry-pipe valve where: 
    1. the sprinkler system is used for the protection of an extra hazard occupancy, or 
    2. water takes more than 60 s to reach the test pipe after the opening of the most remote test pipe valve. In any case, the delivery of water to the most remote sprinkler shall not exceed 60 s. 

     
  2. Where the water supply consists of a connection or connections from a municipal water service, an excess pressure pump, manually started and electrically driven, shall be provided adjacent to the sprinkler alarm valve. This pump shall be capable of providing a pressure on the sprinkler system within a period of 30 min. of at least 175 kPa in excess of the normal maximum municipal water pressure, measured at the alarm valve. Where there is more than 1 wet system, at least 1 excess pressure pump shall be provided for each sprinkler system header.

  3.  
  4. The portion of the sprinkler system protecting cooking equipment and ductwork shall be interlocked with the electrical power and the fuel supply to the cooking equipment so as to automatically shut off the electrical power and fuel supply, including the pilot flames, to all appliances protected by the system. 
 
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