Service Delivery 3 Fire Extinguishers. Aim To introduce students to the various types of fire...
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Transcript of Service Delivery 3 Fire Extinguishers. Aim To introduce students to the various types of fire...
Service Delivery 3
Fire Extinguishers
Aim
To introduce students to the various
types of fire extinguishers and their
differing uses
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.
Types of extinguishers
• Water
• Foam
• Dry powder
• Carbon dioxide
• Halon.
Method of pressurisation
• Gas cartridge
• Stored pressure.
Certification.
Items covered by BS EN3
• Duration of discharge
• Hoses and nozzles
• Marking
• Colour coding.
Colour coding.
Water extinguisher
Gas cartridge.
Operating lever
control valve
Cartridge piercer
CO2 cartridge
Discharge tube
White
Hose
Nozzle
Water extinguisher
Stored pressure.
Operating lever
Safety pin
Carrying handle
Control valve
Stored pressure area
Water
Discharge tube
Nozzle
Non-use of water extinguishers
• Do not use on fires involving electricity
• Do not use on flammable liquid fires.
Types of foam extinguisher
• Self-aspirating
• Non-aspirating.
Foam extinguisher
Self-aspirating.
Hose connection
Striker
Carrying handle
CO2 gas cartridge
Discharge tube
Foam solution
Foam branch
Foam application.
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.
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.
Dry powder extinguisher
Gas cartridge.
Operating lever
Carrying handle
CO2 cartridge piercer
Gas inlet tube
CO2 gas cartridge
Powder
Discharge tube
Nozzle
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.
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.
Halon extinguisher
Stored pressure.
Operating leverSafety
pin
nozzle
Stored pressure area
Liquid BCF
Discharge tube
Main uses of halon extinguishers
• Small ‘class B’ or ‘class C’ fires
• Fires involving delicate electrical equipment.
Non-use of halons
Do not use on fires involving;
• Chemicals containing oxygen
• Reactive metals
• Metal hydrides.
Carbon dioxide extinguisher.
Operating lever
Safety pin
Carrying handle
Control valve
CO2 gas
Discharge horn
Flexible high pressure hose
Liquid CO2
Discharge tube
Main uses of carbon dioxide extinguishers
• On small fires involving flammable liquids
• On small fires involving electrical equipment.
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.
Carbon dioxide application.
Fire Blanket.
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…
• Recognise the hazards associated with each extinguisher
• State when it would be suitable to use a fire blanket.
THE END