fire engineering

Q: discus different type of fire and fire extinguishing method.

A: fire is an exothermic chemical reaction between fuel and oxygen in the air which produces heat flame and light.

SafeChemE - Fire Triangle

        FIRE TRIANGLE

Combustion or burning is the sequence of exothermic chemical reactions between a fuel and an oxidant accompanied by the production of heat and conversion of chemical species. The release of heat can produce light in the form of either glowing or a flame.

fire tetrahedron Archives - Marine Engineering Study Materials
hence, the extinguishing methods would be.
removing any one side of the triangle.

ignition temperature -  cooling
fuel - starvation
oxygen - smothering
chain reaction - chain breaking method

Fires must be fought carefully depending on the materials involved. That is why they have been classified in 6 different categories:

UK BASED CLASSIFICATION
  • Class A – Fires that involve solid or organic materials, such as wood, plastics, paper, textiles, or coal.
  • Class B – Fires that involve flammable liquids, such as gasoline, petroleum oil, paint, or diesel.
  • Class C – Fires that involve flammable gases, such as propane, butane, or methane.
  • Class D – Fires that involve combustible metals, such as magnesium, lithium, sodium,      potassium, titanium, or aluminium.
  • Class F – Fires that involve cooking oils and fats, such as vegetable oil, sunflower oil, olive oil, maize oil, lard, or butter (typically those used for deep-fat fryers).
  • Class E - Although it is not recognized as a separate class of fire in Europe, electrical fires that involve live equipment and electrical sources are also a type you should bear in mind (think of it as an informal Class E; ‘E’ for electric to help you remember).

    US BASED CLASSIFICATION
    CLASS “A” FIRES   -  Ordinary combustibles such as    wood,  paper, cloth.
    CLASS “B” FIRES  - Flammable liquids such as oil, grease
    CLASS “C” FIRES   -     Energised electrical equipment
    CLASS “D” FIRES   -    Flammable Metals
    CLASS " K "  - for kitchen fir

    Q: discuss storage, handling, transportation of explosive/flammable materials.

    A: 







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