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12 Cards in this Set
- Front
- Back
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High expansion foam - dangers to a firefighter |
Claustrophobia Disorientation Limited audibility of speech Back draughts Difficulty with travel and location Difficulty seeing hazards |
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Foam inlets in buildings Fixed piping where foam can be pumped |
- foam applied without entering compartment - inlet tapered for most branches - protected by glass panel indicating risk |
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Considerations when using foam |
- never apply on biting liquid - open branch away from fire - apply furthest point from the fire - enough to apply and maintain sealing blanket - surrounding risks with covering jets - preserve blanket until flammable liquid cooled - not to walk through or drag hose through foam |
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Low expansion foam applications |
Rain down Rolling on Off wall Gentle application |
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Low expansion foam equipment Delta 400 |
6 bar 400lpm |
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Low expansion foam Ground monitor |
950lpm Expansion rate 12:1 7 bar |
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Properties of foam |
- volume of air mixed with volume of solution - quantity of foam concentrate added - size of bubbles |
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Effectiveness of foam |
- concentrate good condition - correct mixture of concentrate - good maintenance if equipment - correct pump pressure |
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Foam concentrates Low expansion |
2:1 to 20:1 |
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Foam concentrates high expansion |
200:1 to 2000:1 |
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Foam used on class A and B fires |
Flammable liquids Liquefiable solids Creates smothering blanket cutting oxygen supply |
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DISIC |
Dilutes surrounding air Isolates fuel from oxygen Sealing blanket prevents vapour escaping Intercepts radiant heat Cooking of fuel |
