Transcript Water extinguisher

Service Delivery 3
Fire Extinguishers
Aim
To introduce students to the various
types of fire extinguishers and their
differing uses
Learning Outcomes
At 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.
Operating
lever
Water
extinguisher
control valve
Cartridge
piercer
CO2 cartridge
Discharge
tube
White
Hose
Gas cartridge.
Nozzle
Operating lever
Water
extinguisher
Safety pin
Carrying handle
Control valve
Stored
pressure area
Water
Nozzle
Stored pressure.
Discharge
tube
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
Hose
connection
Striker
Carrying
handle
CO2 gas
cartridge
Discharge
tube
Foam
branch
Self-aspirating.
Foam
solution
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.
Operating
lever
Dry powder
extinguisher
Carrying
handle
CO2 cartridge
piercer
Gas inlet
tube
CO2 gas
cartridge
Powder
Discharge
tube
Gas cartridge.
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
Safety
pin
Operating lever
nozzle
Stored
pressure
area
Liquid
BCF
Discharge
tube
Stored pressure.
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
Flexible high
pressure hose
Control
valve
CO2 gas
Liquid CO2
Discharge
horn
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