
Control measure
Prevent heat transfer to flammable liquid
Control measure knowledge
A boil-over usually occurs when there is:
- A full surface tank fire
- The tank contains petroleum mixtures with a wide range of boiling points
- There has been a long pre-burn time
- There is a heat wave
A boil-over can occur in two different ways:
- Water being introduced to the container
- The heat wave meeting water already present at the bottom of the container
Where a heat wave is suspected to be travelling down through a flammable liquid, operational tactics should be implemented to prevent the heat wave reaching any water at the base of the container. Extinguishing the fire will prevent further heat transference, slowing and finally stopping the heat wave. Typically, foam is the most effective method for tackling a flammable liquid surface fire.
Thermal imaging may be able to identify the level between hot and cooler liquid within the container. While applying uniform cooling to the tank may slow or stop the progress of the heat wave, if the cooling is not uniform, this may risk the integrity of the tank. There is a risk that the side of the tank may split, resulting in a large spill of burning flammable liquid.
Further thermal imaging equipment monitoring will enable the incident commander to determine the success of this control measure.
Strategic actions
Tactical actions
Consider applying foam to a flammable liquid surface fire to limit heat transfer
Consider boundary cooling containers of a flammable liquid to limit heat transfer
Monitor tank contents using thermal imaging equipment
TRAINING SPECIFICATION
Knowledge and understanding
Control measure element | Learning outcome |
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Prevent heat transfer to flammable liquid |
Understand:
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Practical application
Control measure element | Learning outcome |
---|---|
Prevent heat transfer to flammable liquid |
Demonstrate the ability to:
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- HazardSlop-over and boil-over
- Control measureCordon control: Boil-over