ABOUT HYPERMIST ( LOCAL APPLICATION ) FIXED FIRE FIGHTING SYSTEM IN ENGINE ROOM - REGULATION/SAFETY/WORKING/MANUAL AND AUTO RELEASE TESTING.

  
- Explain about your ship another fixed fire fighting system into E/R?
- Regulation regarding Local fire fighting?
- Safety on Hypermist system?
- How it will activate?

Working principle: COOLING

SOLAS REGULATION:

-Cargo ship 2000 GT and above have this system.
-M/C space 500 m3 in volume and above required additional fixed fire fighting system.
-In periodically unattended M/C space have Manual and Auto release
-In continue manned it have only manual release.
-It will protect are without the engine shutdown, personnel evacuation or sealing of space.
                  -Around M/E,A/E
                  -Boiler platform
                  -Purifier room
                  -Incinerator area
-Activation shall give a visual and audible alarm in the protected space.


Working;

-It will get activate only when TWO detector will get activate, than and than only.
-Once it will activate it will send a signal to fire alarm panel.
-Room fire alarm panel sense the ZONE of fire and it will send signal to Hypermist control panel
-H.M. control panel send signal to High pressure pump ( Plunger type reciprocating pump ) starter And also solenoid operating valve according to Zone of fire capacity of pump: 200 litre/min @ 70 bar pressure discharge
-At nozzle 12-20 litre/min @ 50 bar pressure discharge.
-It is very high water mist system which create a water fog which effectively puts out the fire while .Also providing a cooling effect.
Specialty of H.M Nozzle: its diffuser action in Nozzle drop in pressure at Nozzle throat will breaking he liquid particle into fine mist.

-The fire breathing process is based on three mechanism
1. cooling of the flame
2. reduction of the oxygen content by the displacement of the air by expansion of water vapour.
3.The diminuation of the radiant heat.

- The pressurized water in contact with the fire vaporized heat is converted into steam the this process lower the temperature . The water expands 1700 times taking the air away from the Fire.
-This system decreases water consumption then sprinkler system.
- it shall be supplying water for 30 minutes to avoid the reignition 
-the capacity of the system shall be based on the largest of the protected area.
- Has smoke eliminating affect, the floating smoke particle being absorbed and settled by the fog.
- Hypermist switch  should always be on auto mode.

 Line test by blowing air 

The whole piping system to be blown through with compressed air at a pressure of 7 bar. Check the free passage of air from the nozzle.

 Alarm test

1.Detector sensor (2 test )
2.high and low level water alarms switch
3. electric source failure shall be tested .

TESTING
1. select the switch to manual position .
2.open the pin of solenoid valve and operate it.
3. From local start the pump.
4. Mist will start coming at the relevant nozzle.
5. stop the pump.
6. reset all the system.

AUTOMATIC RELEASE TEST

1. close the water suction valve.
2. disconnect the motor power cable.
3. activate both detector by UV lamp.
4. check the alarm of the main control panel visual and audible.
5.open the air flush valve
6. check the air release from the nozzle in that area.
7.push the stop button from local control panel.
8. put system reset  back in Operation.

 Reset the system 

1.open the pump drain.
2. close the suction valve of water tank.
3. open the drain valve where tested .
4.After flushing with air and no water should come from nozzle only air should come. Now close the air valve.
5. put system back to normal position.

SAFETY

-High and low water alarm switch
-Detector sensor. ( TWO )


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