DCP type fire extinguisher
[we can easily study about DCP type fire extinguisher by this post]
Introduction –
DCP - Dry chemical powder
Fire extinguisher is a potable first- aid fire fighting equipment that help to extinguish the fire initial stage (short type of fire) to avoid big fire accidents. DCP type fire extinguisher have much use for multipurpose than others in the India also others countries. It also known as ABC type fire extinguisher.
|
Read to
topic with some more information. |
|
|
Definition -
This type of fire extinguisher contain dry chemical powder for extinguish the fire for that it call powder type fire extinguisher.
classification of DCP type fire extinguisher -
co2 cartridge type
Stored pressure type
Color -
This type of extinguisher color coded by blue with red.
Carbon dioxide (co2) cartridge type extinguisher
This type of extinguisher available most of industrial area also it has use domestically.
It contains cartridge for that it call cartridge type extinguisher.
Agents and gas –
Typically DCP type fire extinguisher contains extinguishing agent sodium bicarbonate (97%) magnesium separate (1%), magnesium carbonate (1.5%) calcium phosphate (1/2%) (Color – white & blue) and co2 action like expelled for agents.
ABC type extinguisher contains mixture of mono ammonium phosphate (color – pale yellow) & ammonium sulfate (40% -60% / 60% - 40% depend on standard.) for that it call tri class extinguishing agents.
Parts of extinguisher –
Extinguisher have 2 sections
Main body and cap assembly
Main body – steel cylinder, cartridge, siphon tube, strainer, discharge tube, nozzle, carrying handle.
Cap assembly - safety clips, vent hole, inner hole, safety pin, nick ring, plunger/ operating lever, spring pin system.
Function of parts –
• Steel cylinder- contain for extinguishing agent dry chemical powder (sodium bicarbonate)
• Gun metal cap – it help to tightly screw hole of cylinder and hold other parts.
• Nick ring – it help to properly fix the screw cap.
• Cartridge – contain compress co2 gas.
• Plunger /operating lever- that help trigger the extinguisher.
• Spring pin system – it help to puncher co2 cartridge.
• Safety vent hole – help to release extra pressure of cylinder before the cap taken off during blockage cylinder or unnecessary charge.
• Inner hole – it help to spared co2 gas on the cylinder from cartridge.
• Safety pin - it help to lock the trigger.
• Siphon tube – it help to pump up extinguishing agents to discharge tube.
• Strainer – it help to filter the powder.
• Discharge tube – it help to throw out powder.
• Nozzle - it help spread the water on the fire like rain.
Assemble of parts -
• DCP type fire extinguisher has a 1.6 mm thick steel cylinder and cylinder fill by powder according of measurement mark.
• Gun metal cap proper fix by nick ring top the cylinder.
• The plunger/ operation lever joint on cap that move through the cap.
• A safety pin attach with plunger.
• Safety vent hole fix beside the plunger neck position of cap.
• Inner hole fix beside the cartridge in side of cap.
• A spring pin system attach with plunger/ operating lever.
• Co2 cartridge hold on cartridge holder just under spring pin system in the cap.
• Siphon tube fix bottom of cylinder and connect to discharge tube.
• Discharge tube attaches with cylinder body (plunger type) or attach with cap assembly (operating lever type).
• A nozzle attach with end point of discharge tube.
Technique of work-
During the fire first hard press on the plunger/operating lever, then spring pin break the seal of cartridge to release co2 empty space of over the water and create pressure(6 – 7kg/cm2) to the powder , the pressurize powder pump up by siphon tube to throw (about 18 feet) out through discharge tube to center of fire.
Operating methods –
• First take it to fire site from wall/extinguisher stand
• Take proper physically safe position near of fire according of wind direction.
• Remove the safety clip/pin.
• Strongly punch on the plunger/operating lever to break the seal of co2 cartridge.
• Hold the discharge tube to aim the fire and sweep on the fire.
• If the fire extinguish before finish of cylinder then upside down the cylinder to save the powder.
Maintenance -
Every extinguisher have need proper maintains for it always ready for extinguish fire in emergency.
• DCP type fire extinguisher is one time use by one time refilling.
• Daily/ weekly clean up the whole body
• Check it properly every parts interval every 3 month
• Must be check the weight of co2 cartridge, if it loss of 10% of weight so it not for use.
• All movable parts must be check for to maintain proper movement
• Properly clean up inside of cylinder and check about rust.
• Must be check the powder, if the powder gets small shape then take it sunlight and proper strainer then fill it again.
• Check the siphon tube and discharge tube to maintain proper working condition.
• Every one year it must be refilling even it not charge.
• Every 2 year it must be hydraulic test by 25 kg/cm2.
This type of extinguisher refilling easy process
• Open the cylinder and remove used cartridge and fix the new co2 cartridge in holder.
• Fulfill the good quality powder according particular measurements mark of cylinder.
Stored pressure type water extinguisher
DCP types fire extinguisher are new and very advance that use every industrial site in present type. Water type stored pressure extinguisher is replacement of other type of water extinguisher.
Expended gas and extinguishing agents place in same container for that it call stored pressure type extinguisher.
Gas and agents -
This type of extinguisher use compress air / nitrogen for create pressure and extinguishing agents are sodium bicarbonate, mono ammonium & ammonium sulfate.
Parts of extinguisher -
This type of extinguisher has 2 sections
Main body and cap assembly
Main body- steel cylinder, siphon tube, strainer.
Cap assembly- safety pin, operating lever , spring valve, carrying handle ,pressure gauge , non return valve (NRV), discharge tube, nozzle,
Function of parts –
• Steel cylinder – it contain water and expelled gas is nitrogen / compress air
• Siphon tube – it help to pump up the powder
• Strainer - it help to filter the water before enter to siphon tube.
• Operating lever – it help to trigger the extinguisher
• Spring valve – it control by operating lever to open the valve & start the flow out.
• Handle - it help to carry the extinguisher and also help to operate the lever.
• Pressure gauge – it help to show the cylinder internal pressure.
• Non return valve – it help to stop return of compress gas / air from cylinder.
• Discharge tube – it help to throw out the extinguishing agent (dry chemical powder).
• Nozzle – it help to spread the agents (powder) to the fire.
Assembly of parts –
• This type of extinguisher have 1.6 mm cylinder that contain powder measurement mark of cylinder and remain space fill by nitrogen / compress gas.
• Cap assembly tightly screw top of the cylinder ant hold other parts for that it call cap assembly.
• Operating liver fix on the cap with carrying handle.
• Safety pin attach with leaver.
• Spring valve fix between siphon tube and discharge tube that that attach with operating lever inside of cap.
• Pressure gauge attach beside the discharge tube on the cap.
• Siphon tube fix bottom form cylinder to connect with discharge tube.
• Nozzle joint with discharge tube.
Working technique –
During the fire first hard press to lever that open the spring valve and extinguishing agent(water) throw out(distance 18 feet) through discharge tube and nozzle( jet pressure 7kg/cm2), because already the agent(powder) pressurized due to stored nitrogen /compress air pressure in same container.
Operating method –
• First take it to fire site from wall/extinguisher stand
(Check the pressure gauge should be 10.5kg green for working condition)
• Take proper physically safe position near of fire according of wind direction.
• Remove the safety clip/pin.
• Strongly press on the operating.
• Hold the discharge tube to aim the fire and sweep on the fire.
• If fire is control before finish cylinder then free the lever to stop it because it not for one time use like cartridge type by one time refilling .
Maintenance –
Every extinguisher have need proper maintains for it always ready for extinguish fire in emergency, but this type of extinguisher openly maintenance and refilling occur only on manufacturer.
Daily/ weekly clean up the whole body.
Every 3/6 month need to it internal inspection by professional.
Check the discharge tube and maintain too easy to work.
Need hydraulic test 25 kg/cm2 every 3 year for 6 minutes.
Extinguishing method –
powder type extinguisher extinguish the fire through smothering method and bra the chain reaction ion system.
Smothering – the powder create a cover on the fire to stop flow of breathing air of fire (o2)
Break the chain reaction – the powder prevent chemical reaction involving o2, heat, fuel. Break down free radicals of fuel that highly reactive molecules react with o2 during combustion.
Size –
potable – 1kg, 2 kg, 5kg, 10 kg,
Mobil – 22.5 kg, 50 kg, 75 kg , 150 kg ,200kg,
Application -
This type of extinguisher specially use for A, B, C class fire but also can be use for E class and k class fire.
Extinguisher safety -
• Do not place the extinguisher any hot area.
• During use of cartridge type extinguisher be aware because it can be blast due to fault.
• Extinguisher should be proper maintaining.
• During charge of DCP type fire extinguisher should be tightly hold discharge tube, because it can hit due to pressure.
thank you my dear safety friends
0 Comments