1. FIRE PROTECTION SYSTEM
AX 272 F
c.) PRE-ACTION SYSTEM
(For Electrical Substation)
b.) STANDPIPE SYSTEM
a.) SPINKLER SYSTEM 4 ZONE

2. SPRINKLER SYSTEM
4 ZONES

3. ALARM VALVE STATION

4. STANDPIPE SYSTEM

5. CLASS III SYSTEM IS
PROVIDED
Class III Systems Provided 1 ½”
hose stations to supply water for use
by trained building occupants and
2½” hose connections to supply a
larger volume of water for use by
Fire Department.

6. FIRE HOSE STATION
ADVANTAGES
• Quick Suppression
• One Person Operation
• Minimal Water Damage
• Occupant Safety and Rescue

7. TYPICAL CLASS III FIRE HOSE STATION

8. OPERATION OF FIRE
HOSE STATIONS
1. Open valve completely
2. Pull hose entirely off rack
3. Open nozzle
THREE STEPS FOR OPERATION

9. 1. Open valve completely.

10. 2. Pull hose entirely off rack
(or else water will not flow)

11. 3. Open nozzle. Water will flow when hose is
entirely off rack & nozzle is open.

12. PREACTION SYSTEM
FOR
ELECTRICAL SUBSTATION

13. • Preaction System Control Panel
• Smoke detectors
• Manual Pull Station (Electric)
• Alarm Bell
• Sounder cum flasher
PREACTION SYSTEM
COMPONENTS

14. • Deluge Valve w/ Double Interlock
Trim
• Isolation Valve
• Pressure Switch (Air)
• Pressure Switch (Water)
• Air Compressor
• Air Maintenance Device
PREACTION SYSTEM
COMPONENTS

16. PREACTION SYSTEM
SEQUENCE OF OPERATION
Smoke Detectors (Zone-1) and Pressure Switch
(Zone-2) Monitoring the System Air Pressure in
the piping are wired in a cross zoned
configuration

17. Activation of smoke detector or operation
of a sprinkler causes following.
• A visual indication on the System Control
Panel
• Audible alarm from bell
• Send “Fire” indication to the Fire Alarm
System
PREACTION SYSTEM
SEQUENCE OF OPERATION

18. PREACTION SYSTEM
SEQUENCE OF OPERATION
Activation of smoke detector & operation
of a sprinkler causes following.
• Visual indications on the System Control Panel
• Audible alarm from bell & sounder cum flasher
• Deluge valve operates
• Water flows in to the system piping and
discharges through the ‘opened’ sprinkler.

19. Manual Operation
• System can be operated manually by operating the
Pull Station (Electric or Hydraulic)
• Visual indications on the System Control Panel
• Audible alarm from bell & sounder cum flasher
• Deluge valve operates
• Water flows in to the system piping (if sprinkler is
not activated, piping will be filled with water)
PREACTION SYSTEM
SEQUENCE OF OPERATION

20. Operation of Air Compressor
Air compressor maintains constant air pressure
in the system piping.
PREACTION SYSTEM
SEQUENCE OF OPERATION