SPRINKLER fixed fire fighting system/REGULATION /Draw SPRINKLER HEAD and WORKING RANGE / MAINTENANCE /TESTING

  
Expalin sprinkler fixed fire fighting system?
Regulation about it? Can we use fire pump?
Draw sprinkler head and working range of it, and which liquid inside bulb?

-Working principle : Cooling

-SOLAS REGULATION

-Every cargo ship 2000 GT and above have fitted
M/C space 500 m3 in volume and above required additional fixed fire fighting system.

-It must have at least TWO source of power for the S/W pump, Alarm & Detection system and F.W.Pump.

-In Accomodation and service space the sprinkler shall come into operation within temp range from 90 c to 79 c except where high temp might be expected the operation temp may be increase by
Not more than 30 c above maximum deck head temp.

-Sprinkler shall be resistant to corrosion by marine atmosphere.

-Sprinkler system is divided into section, each section is permitted to contain not more than 200 Head.Each sprinkler head is sufficient to cover the areas of 16 m about. Sprinkler head are spaced not more than 4 m apart and 2 m from the vertical wall. Each sprinkler head capable of 100 litre/min discharge. It highest sprinkler head in the system is not less than 4.8 bar pressure.

-Each section of sprinkler shall be capable of being isolated by ONE STOP valve.

-Location of STOP valve outside of the associated section or in cabinet and clearly and permanently Indicated.

-Test valve shall be provided for testing the automatic alarm for each section of sprinklers by a Discharge of water equivalent to the operation of one sprinkler. The test valve for each section shall
be situated near the stop valve for that section

-Gauge indicating the pressure in the system shall be provided at each section stop valve and at acentral station

-This system is not to be fitted where NO risk of FIRE, such as Void Space,CO2 room, Public Toilet, etc.

-Paint locker room shall have sprinkler with designed 5 litre/m2 min connected to FIRE MAIN Pump of the ship.

-list or plan shall be displayed at each indicating unit showing the spaces covered and the location .If the zone in respect of each section. Suitable instructions for testing and maintenance shall be
Available

-The sprinkler system shall have a connection from the ship's fire main by way of a lockable screw Down non-return valve at the connection which will prevent a backflow from the sprinkler system to the fire main.

BULB OPERATING RATING

Orange : 57c
Red : 68 c
Yellow: 79c
Green : 93 c
Blue: 141 c

MAINTENANCE OF THIS SYSTEM

-Pressure tank level check and recharge
-Greasing of various valve
-Check alarm system.
-S/W pump testing by closing isolating valve and opening drain valve of pressure switch when the pump should start automatically.
-Drain whole system yearly or every 6 month.


Testing procedure:

-Close the section isolating valve, this will raise an alarm indicating zone isolation

-Now, open the test valve, if no water comes out, then it means the NR valve placed after the Section-isolating valve is not leaking.

- The test valve can be opened to create flow and cause the non return valve and exposing the annular groove which connects to a diaphragm alarm switch ( audible and visual ).FROM THE NON RETURN VALVE OF SECTIONAL VALVE TO THE QUORTZOID BULB OF SPRINKLER HEAD THERE IS ATMOSPHERIC AIR AND BELOW NON RETURN VALVE OF SECTIONAL VALVE THERE IS WATER. AS FIRE OCCURED IN ANY SECTION THE BULB WILL BLAST THE AIR WITHIN WILL ESCAPE IN THE  ATMOSPHERE , SO DUE TO LESS PRESSURE IN THE LINE FROM NON RETURN VALVE OF SECTIONAL VALVE TO QUORTZOID BULB OF SPRINKLER HEAD , THE WATER WILL LIFT THE NON RETURN VALVE IN SECTIONAL VALVE AND THEN WILL GO IN LINE AND SPRAY IN THE SECTIONAL SPACE WHERE FIRE HAS OCCURED  .

-All the above alarms will be indicated on the navigation bridge, E/R as well as in the Fire Control room. The alarm will also indicate the particular zone from where it has risen.

-If all the alarm conditions are satisfied, close all the testing valves, open the section-isolating valve ,Purge the sprinkler line by air and again keep the line pressurized.

-Check from the pressure gauge, that proper pressure has been maintained or not.

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