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19 Cards in this Set
- Front
- Back
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How does foam extinguish a fire? |
Diluting / intercepting / forming / isolating / cooling |
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What foam concentrate does lfb use? |
Low expansion (2:1 - 20:1) / high expansion (200:1 - 2000:1) |
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What mixtures does lfb use of foam to water |
3% for hydrocarbons / 6% for polar solvents |
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What three factors can be varied when producing foam? |
Volume of air / quantity of foam concentrate / size of bubbles |
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The effectiveness of foam depends on what? |
Concentrate in good condition / correct mixture of concentrate used / good maintenance of equipment / correct pump pressure |
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What are the methods of applying foam? |
Gentle application / raindown / rolling on / of wall |
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Once foam is used what considerations must be followed? |
Never apply water / always open away from fire until foam flowing / if burning liquid flowing apply to furthest part / make sure enough foam available / cool surrounding risks / preserve foam blanket / do not break blanket |
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What are the hazards with high ex foam? |
Claustrophobia / disorientation / no light / limited audibility / mini backdraughts / difficult in determining travel and location of fire / difficulty seeing surrounding damage |
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What does a bulk foam unit carry? |
8 x 1000 litres low ex / 1 x 1000 litre high ex / 2 x equipment stillages |
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When is a round the pump inducer test carrier out? |
Weekly |
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Describe a roof ladder |
14kg / 13 rounds / 4.6 m long |
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What are the two main methods to overcome a water shortage? |
Water shuttle / water relay |
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What is a water shuttle? |
A number of appliances ferrying water to incident |
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What types of water relay are there? |
Closed circuit (water pumped directly through one hose to the next - used using LPP'S / open circuit (water pumped through portable dams reservoirs or appliance tanks before entering next pump) |
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How can frictional loss be overcome in a water relay? |
Shortening the distance by using more intermediate pumps / increasing the diameter of the hose |
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The distance between pumps in a relay depends on what? |
Flow required / diameter of hose lines / contours of the relay route |
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What does the efficiency of a water relay depend upon? |
All pumps and equipment being in good condition / layout of the relay / skill of the operator / good communication and incident management |
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What extinguishers are there and what colours? |
Water - red / foam - cream / powder - blue / carbon dioxide - black |
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When are extinguishers inspected? |
On acceptance / daily / after use / annually |
