Service Delivery 3 Fire Extinguishers. Aim To introduce students to the various types of fire...
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Service Delivery 3
Fire Extinguishers
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Aim
To introduce students to the various
types of fire extinguishers and their
differing uses
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Learning OutcomesAt the end of the session students will be able to:
• Recognise the extinguisher colour coding scheme
• Describe the principles of operation of portable fire extinguishers
• Recognise extinguisher suitability for individual risks
• Recognise the hazards associated with each extinguisher
• State when it would be suitable to use a fire blanket.
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Types of extinguishers
• Water
• Foam
• Dry powder
• Carbon dioxide
• Halon.
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Method of pressurisation
• Gas cartridge
• Stored pressure.
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Certification.
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Items covered by BS EN3
• Duration of discharge
• Hoses and nozzles
• Marking
• Colour coding.
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Colour coding.
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Water extinguisher
Gas cartridge.
Operating lever
control valve
Cartridge piercer
CO2 cartridge
Discharge tube
White
Hose
Nozzle
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Water extinguisher
Stored pressure.
Operating lever
Safety pin
Carrying handle
Control valve
Stored pressure area
Water
Discharge tube
Nozzle
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Non-use of water extinguishers
• Do not use on fires involving electricity
• Do not use on flammable liquid fires.
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Types of foam extinguisher
• Self-aspirating
• Non-aspirating.
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Foam extinguisher
Self-aspirating.
Hose connection
Striker
Carrying handle
CO2 gas cartridge
Discharge tube
Foam solution
Foam branch
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Foam application.
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Considerations when using foam extinguishers
• Check whether the foam is self-aspirating or non-aspirating
• Check the foam’s suitability for the type of fire, i.e. is it polar resistant
• Do not use on fires involving electricity.
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Dry powder extinguishers
Powders can be effective on varying classes of fires;
• Class A
• Class B
• Class C
• Class D
• Or combinations of the above.
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Dry powder extinguisher
Gas cartridge.
Operating lever
Carrying handle
CO2 cartridge piercer
Gas inlet tube
CO2 gas cartridge
Powder
Discharge tube
Nozzle
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Considerations when using powder extinguishers(1)
• Avoid inhaling powders especially if chloride based
• Beware re-ignition when extinguisher is expended
• Wind and moisture will affect efficiency outdoors
• Visibility will be reduced.
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Considerations when using powder extinguishers(2)
• Powders will not penetrate hidden spaces
• Powders always create a mess
• Although they are non-conductors they will damage delicate electrical equipment.
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Halon extinguisher
Stored pressure.
Operating leverSafety
pin
nozzle
Stored pressure area
Liquid BCF
Discharge tube
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Main uses of halon extinguishers
• Small ‘class B’ or ‘class C’ fires
• Fires involving delicate electrical equipment.
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Non-use of halons
Do not use on fires involving;
• Chemicals containing oxygen
• Reactive metals
• Metal hydrides.
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Carbon dioxide extinguisher.
Operating lever
Safety pin
Carrying handle
Control valve
CO2 gas
Discharge horn
Flexible high pressure hose
Liquid CO2
Discharge tube
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Main uses of carbon dioxide extinguishers
• On small fires involving flammable liquids
• On small fires involving electrical equipment.
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Considerations when using carbon dioxide
• Discharge will be noisy
• Visibility may be impaired
• The discharge horn and hose become extremely cold - do not hold them with bare hands
• Owing to the poor cooling effect of carbon dioxide, re-ignition may occur.
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Carbon dioxide application.
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Fire Blanket.
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Confirmation Assessments will be based on this lesson and the corresponding study note
Learning Outcomes
• Recognise the extinguisher colour coding scheme
• Describe the principles of operation of portable fire extinguishers
• Recognise extinguisher suitability for individual risks continued…
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• Recognise the hazards associated with each extinguisher
• State when it would be suitable to use a fire blanket.
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THE END