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15 Cards in this Set
- Front
- Back
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How can steel beams/columns contribute to building collapse in a fire? List 2 |
Steel may buckle at temperatures over 600 C. Also the steel can expand and push walls outward. |
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How can cast iron beams/columns contribute to building collapse in a fire? |
Cast iron can crack or shatter when exposed to rapid cooling. |
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How can concrete or stone beams/columns contribute to building collapse in a fire? |
Stone or concrete may spall when hit with a jet. |
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How can walls cause building collapse in a fire? List 3. |
Heat on inner face of wall can cause bowing. Cracks in lower part of wall indicate danger. Walls can be made unstable by collapse of floors. Damaged arches over windows and doors can cause walls to give way. |
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How can floors contribute to building collapse? List 3 |
Collapse of floors can leave high walls unsupported. If floor collapse weight of that floor falls to the next. Shock load can cause building collapse. Damaged floor beams can have a leaver effect on walls. |
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List some general signs of building collapse. List 4 |
Mortar or stone falling from walls Floors coming away from walls Floor collapse Horizontal cracks in walls |
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Name some hazards associated with sandwich panels? List 4. |
PVC coating very flammable. Toxic smoke (hydrogen cyanide). Steel sheeting falling away. Difficult to extinguish core material. |
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Name some hazards associated with gang-nailed roof trusses. |
Truss plates large surface area has greater effect on timber when heated. Nails on truss plate 8-10mm. It takes 7 mins for soft timber to char to a depth of 4mm (weak). May not support weight. |
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What danger do stairs made out of timber present in a fire? |
Stairs maybe burning from underneath so damage may not be visible. They could collapse when weight is applied. |
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Why are stone stair cases particularly dangerous in a fire? |
Rapid cooling can cause Spalling and sudden collapse. Some stone cases are unsupported on one side (cantilever) and can collapse even without Spalling. In a fire stone staircases should be avoided! |
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What is the firefighter signal to evacuate a building? |
Short repeated blasts of a Acme thunderer whistle. |
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On hearing the evacuation signal fire firefighters should? List 4. |
Repeat signal. Leave equipment. Withdraw to nearest exit, closest crews first, other crews guard exits. Report to booking in point for roll call. |
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What operational considerations should be taken in relation to floors in a fire? List 3 |
Smoke and flames my travel along gaps between floors. Carpets can conceal smoke and flames. Electrical wiring runs between floors. |
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Ventilated and reinforced concrete stairwells are a good base operation in a fire. True or false. |
True. |
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Two types of roofs? |
Mansard roof or close coupled pitched roof. Trussed roof. |
