Why Carbon Dioxide is used as the Extinguishing Medium?
Carbon dioxide has a number of desirable properties. It is:
> Non-corrosive
> Non -damaging
>leaves no residues after extinguishing fire
> Not -conductive of electricity so can be used in electrical fire
> Since its a gas, it can can penetrate almost all hazardous areas
> Co2 can be easily liquefied by compression and cooling
> Co2 has density of about 50% greater than the air
Must Read> SOLAS Requirement Of fixed Co2 system and Co2 Bottles
Components In Co2 System
>Control cabinets
Control cabinets contains 2 pilot cylinders with two valves .one is for operating Master valve and the other one is for extinguishers . Control cabinet door is connected to a limit switch. When you open the control cabinet, limit switch get activated and Co2 alarm will raise after 20-30 seconds and as a result engine room blowers will stop automatically.One cylinder is capable for operating Master valve and co2 cylinders . second one act as a standby.
> Co2 Cylinders
Co2 cylinders are connected together to a common manifold, which can be operated remotely as well as manually.Co2 bottles contains liquid co2 at a pressure of 56 bar at 20 degree Celsius.
Must Read> Why Co2 Bottles having Dip Tubes
> How the requirement of Co2 bottles calculated
> Isolating valve/Master valve
Isolating valve or master valve is a pressure operated valve system, which is normally closed, installed in the pipe line. It can be operated remotely and manually.
> Pressure relief valve
If co2 cylinder leaks into the manifold, there is a possibility of of opening other cylinders by its stored pressure . so when the manifold pressure increases above set point, pressure relief valve is lifted and releases the pressure outside the Co2 room.
> Discharge Nozzle
Discharge nozzles are installed in the machinery space through which liquid Co2 get gasified instantaneously thereby causing the atmosphere in the space to become inert and smothering the fire.
> Pressure gauge And Air connection
There is a pressure gauge and air connection which will help you to do the pressure testing and line blowing.
Operating procedure.
> Open control cabinet using the key provided in the key box ( alarm will rise automatically and blowers will be stopped)
>Ensure that all personals are evacuated and the space is isolated by stopping of all vents,doors, blowers etc.
> Shut down the machines and fuel oil supply
> Open pilot valve cylinder valve
> Open the valve for Main manifold valve
> Make sure that the Main valve is open, if not manually open the valve
> Open the pilot valve for extinguisher cylinders(If it's not opening open it manually)
> Now the CO2 gas will discharge.
Maintenance On Co2 System
> Once in every month
Inspect for piping and equipment for mechanical breakage
Make sure that nothing has been placed to interfere the normal operation of the system
Operate the valve several times and make certain that it does not stick
> Once In Every Year
Cylinder should be weighed to determine the Co2 content
If the net weight is decreased by 10% of the actual weight, cylinder should be recharged
> Once In Every Two Year
Blow through all pipping with air or Co2 to make sure that the line is not blocked
Questions You Can Answer From This Post
> Explain Co2 Fixed firefighting system onboard ship with diagram
> Explain Co2 flooding system working with diagram
> Fixed co2 system maintenance
> How to activate Co2 Flooding system
> Entry Procedure after discharge of Co2
> Why Co2 is using as the extinguishing medium
Carbon dioxide has a number of desirable properties. It is:
> Non-corrosive
> Non -damaging
>leaves no residues after extinguishing fire
> Not -conductive of electricity so can be used in electrical fire
> Since its a gas, it can can penetrate almost all hazardous areas
> Co2 can be easily liquefied by compression and cooling
> Co2 has density of about 50% greater than the air
Must Read> SOLAS Requirement Of fixed Co2 system and Co2 Bottles
Components In Co2 System
>Control cabinets
Control cabinets contains 2 pilot cylinders with two valves .one is for operating Master valve and the other one is for extinguishers . Control cabinet door is connected to a limit switch. When you open the control cabinet, limit switch get activated and Co2 alarm will raise after 20-30 seconds and as a result engine room blowers will stop automatically.One cylinder is capable for operating Master valve and co2 cylinders . second one act as a standby.
> Co2 Cylinders
Co2 cylinders are connected together to a common manifold, which can be operated remotely as well as manually.Co2 bottles contains liquid co2 at a pressure of 56 bar at 20 degree Celsius.
Must Read> Why Co2 Bottles having Dip Tubes
> How the requirement of Co2 bottles calculated
> Isolating valve/Master valve
Isolating valve or master valve is a pressure operated valve system, which is normally closed, installed in the pipe line. It can be operated remotely and manually.
> Pressure relief valve
If co2 cylinder leaks into the manifold, there is a possibility of of opening other cylinders by its stored pressure . so when the manifold pressure increases above set point, pressure relief valve is lifted and releases the pressure outside the Co2 room.
> Discharge Nozzle
Discharge nozzles are installed in the machinery space through which liquid Co2 get gasified instantaneously thereby causing the atmosphere in the space to become inert and smothering the fire.
> Pressure gauge And Air connection
There is a pressure gauge and air connection which will help you to do the pressure testing and line blowing.
Operating procedure.
> Open control cabinet using the key provided in the key box ( alarm will rise automatically and blowers will be stopped)
>Ensure that all personals are evacuated and the space is isolated by stopping of all vents,doors, blowers etc.
> Shut down the machines and fuel oil supply
> Open pilot valve cylinder valve
> Open the valve for Main manifold valve
> Make sure that the Main valve is open, if not manually open the valve
> Open the pilot valve for extinguisher cylinders(If it's not opening open it manually)
> Now the CO2 gas will discharge.
Maintenance On Co2 System
> Once in every month
Inspect for piping and equipment for mechanical breakage
Make sure that nothing has been placed to interfere the normal operation of the system
Operate the valve several times and make certain that it does not stick
> Once In Every Year
Cylinder should be weighed to determine the Co2 content
If the net weight is decreased by 10% of the actual weight, cylinder should be recharged
> Once In Every Two Year
Blow through all pipping with air or Co2 to make sure that the line is not blocked
Questions You Can Answer From This Post
> Explain Co2 Fixed firefighting system onboard ship with diagram
> Explain Co2 flooding system working with diagram
> Fixed co2 system maintenance
> How to activate Co2 Flooding system
> Entry Procedure after discharge of Co2
> Why Co2 is using as the extinguishing medium
Why 2 minute is given for recharging a CO2 from CO2 bottles ???
ReplyDeleteSomeone from the outside looking in might think the notion of choosing a maintenance strategy is as simple as choosing between 'repair it' or 'replace it', and that's not entirely inaccurate. plumber Glenfield
ReplyDeleteplease do I need to disconnect the cylinder from manifold before blow the line with air
ReplyDeleteNo.. no need to disconnect any cylinder.. air is blowing after the master valve
DeleteDo I need to disconnect pilot cylinder while the safety pin is intact before the blowing the lines ?
ReplyDelete