CLOSED HEAD PUMP OPERATED SYSTEM
- itis the quiesce state the pipe work throught the system is pressurized to 20 bar
- Pressure switches 1 & 2 (A) within the intiating the pipe work circultry and wired in series to the pump skid control Panel. When the pressure in the pipe work is below 20 bar the contacts are open and the jockey pump will run. Once 20 bar is reached the contacts will close and the jockeypump automaticallyswitches off.
- When the nozzle is activated by a fire the glass bulb bursts allowing the plunger within the nozzle to open. the pressure within in the system drops and pressure switches 1 & 2(A) signal the jockey pump to commence running
- The resultant flow in water is picked up by the two flow switches (B) wired in series back to the Pump Skid Control Panel. Once this flow reaches a quarter of a liter per minute these units change state from closed to open and the duty pump automatically commences running. Water is delivered to the nozzles at 110 bar.
- The pump skid is designed and built to provide 100% redundancy should equipment fail.
- The pump Skid Control Panel provides fault monitoring on all three pumps and actuation devices. the Panel displays these outputs locally on the panel facia or volt free contacts within the Panel can be used to connect to a BMS.
Closed Head Cylinder System
- System charged to 20 bar in its quiescent state. Pressure in pipe works holds the differcial pressure valve (A) closed
- When a fire causes a frangible bulb within a nozzle to rupture, the plunger opens and the pressure within the systems falls The differencial pressure valve opens and nitrogen is released through the regulator at 110 bar before entering the water cylinder.
- Once in water cylinder the pressure of the nitrogen forces the water up the syphon tube, through the water manifold and into the pipe work at 110 bar
- The Activated pressure switch can be used to signal a house fire alarm system or the BMS – show the system discharging.
OPEN DELUGE PUMP OPERATED SYSTEM
- The pipe work has no water in it until the system is activated and the nozzles are open with no plunger or frangible bulb . In these systems all nozzles will discharge simultaneosly
- These pumps are driven by 3-phase motors and controlled by an Electrical panel. On receipt of an electrical signal to the Control Panel then starts the duty pump and water is delivered to the nozzle at 110 bar.
- All motor, pumps, intiating pipe work circultry and control panel is ‘skid’ mounted, the water supply is held in a water break tank connected to the mains supply
Open Deluge Cylinder System
- When a fire is detected by a smoke sensor on either zone 1 or 2, the relevant red zone LEDS will pulse.
- The first stage alarms (Electronic Sounder and Xenon Beacon) willbe activated and the first stage LED will be illuminated
- Any Building Control Systems connected to the first stage relays will also be signalled. Typically this will include House Fire Alarm System, Air Conditioning Plant and Door Security Systems.
- If a fire signal is then reported back to the Control Panel from another sensor on the second zone both zone LEDS will pulse
- Second stage alarms (Bells) will be activated and both first stage and second stage LEDS will be illuminated.
- Any Building Control Systems connected to the second stage relays will also be signalled. Typically this will include power supply to the risk area
- The Timer Held LED will pulse to show that the extinguishant release timer is running. When the timer ends the Timer held LED will be extinguished and the water mist system will be activated.
- The solenoid value on the Nitrogen system will be operated and Nitrogen at 200 bar will be released throught the regulator which will reduce the pressure to 110 bar on entering the watermist values
- The values will rapidly open, delivering water almost instantaneosly to the nozzles at the desired pressure of 100 bars, ensuring immediate misting and most effective extinguishing on discharge.
- The flow switch on the manifold sends a signal to the Control Panel to indicate that the Water Mist is activated. The system will then dischage for the designed run time.
- In Controlled tests, the time taken to extinguish a mock up of a fire similar to this took under 15 seconds
Sequence of events for Open Deluge System
2. If a fire signal is then reported back to the Control Panel from another sensor on the second zone both zone LEDs will pulse, second stage alarms ( Bells ) will be activated and both first stage and second stage LEDs will be illuminated. Any Building Control Systems connected to the second stage relays will also be signalled. Typically this will include power supply to the risk area. The Timer Held LED will pulse to show that the extinguishant release timer is running. When the timer ends the Timer Held LED will be extinguished and the water mist system will be activated.
Pressing the manual release at any time will put the system straight into second stage and activate the timer for Water Mist discharge.
3. The solenoid valve on the Nitrogen system will be operated and Nitrogen at 200 bar will be released through the regulator which will reduce the pressure to 110 bar on entering the watermist valves.
4. A Flow switch on the manifold sends a signal to the Control Panel to indicate that the Water Mist has activated. The system will then discharge for the designed run time.