Hydrocarbon Fire (HF) – Hydrocarbon fires are
caused by combustible liquid such as oil and gas
. Carbon and hydrogen make up hydrocarbons and they do not have affinity for H2O (water). Some examples are petrol, diesel, benzene and kerosene. … By comparison to a cellulosic fire, the radiation value is 160 kW/m2.
How do you put out a hydrocarbon fire?
Extinguishing Agents
For fires involving hydrocarbon liquids,
water
is used primarily to minimise escalation of a fire by cooling exposed surfaces. Water spray and water fog may be used for making a heat screen between the fire and fire-fighting personnel and equipment.
What is hydrocarbon fire extinguisher?
In such case hydrocarbon fire extinguisher is used which has
turkey red oil
, which causes the foaming of carbondioxide under pressure. The foam covers the surface of burning substance and cuts off the supply of air to control fire.
What is polar solvent fire?
Polar Solvent: In fire fighting,
any flammable liquid which destroys regular foams
. Polar solvents aggressively attack the bubble by mixing with the water in the bubble structure. Polar solvents require special foam agents and mix ratios. Examples: esters, ethers, alcohols, aldehydes and keytones.
Do fires involve hydrocarbons?
When you put wood on a hot fire, the smoke you see is the volatile organic compounds (hydrocarbons) evaporating from the wood. They start to evaporate at about 149°C. If the fire is hot enough, the
hydrocarbons will burst into flames
.
What is metal fire?
Generally, metal fires are
a hazard when the metal is in the form of sawdust, machine shavings or other metal “fines”
, which combust more rapidly than larger blocks due to their increased surface area. Metal fires can be ignited by the same ignition sources that would start other common fires.
What type of fire is Class A?
Class A:
Ordinary solid combustibles such as paper, wood, cloth and some plastics
. Class B: Flammable liquids such as alcohol, ether, oil, gasoline and grease, which are best extinguished by smothering.
What are the 3 methods of extinguishing a fire?
All fires can be extinguished by
cooling, smothering, starving or by interrupting the combustion process
to extinguish the fire. One of the most common methods of extinguishing a fire is by cooling with water.
What fire Cannot be put out by water?
Water does not extinguish
Class B fires
and can spread the flammable liquid, making it worse. You must only put out these fires with powder, foam, or carbon dioxide extinguishers to cut off the fire’s oxygen supply. … You therefore, cannot use water on these fires and can only use a dry powder extinguisher.
What are the 4 types of fire?
- Class A Fires. involve common combustibles such as wood, paper, cloth, rubber, trash and plastics.
- Class B Fires. involve flammable liquids, solvents, oil, gasoline, paints, lacquers and other oil-based products.
- Class C Fires. …
- Class D Fires. …
- Class K Fires.
What is a 3 dimensional fire?
A three-dimensional fire is
a liquid-fuel fire in which the fuel is being discharged from an elevated or pressurized source
, creating a pool of fuel on a lower surface. Foam is not effective at controlling three-dimensional flowing fires.
What is a 2 dimensional fire?
The two- dimensional Fire code is a
two-dimensional cyclic code designed for single twodimensional burst correction
. Several important properties such as the burst-correcting capability and the positions of the check symbols are presented. Also, encoding and decoding methods are pre- sented.
What is polar and nonpolar solvents?
Polar solvents have large dipole moments (aka “partial charges”); they contain bonds between atoms with very different electronegativities, such as oxygen and hydrogen.
Non polar solvents contain bonds between atoms with similar electronegativities
, such as carbon and hydrogen (think hydrocarbons, such as gasoline).
What is the most difficult fire to put out?
Grease fires
are among the most difficult type of fire to put out. Attempting to extinguish it with water can make the fire grow, as water and oil do not mix. Grease fires are often associated with kitchen fires and they occur when the oil gets too hot when cooking.
Why do hydrocarbons burn easily?
The energy required to break the bonds in the hydrocarbon molecules is substantially less than the energy released in the formation of the bonds in the CO
2
and H
2
O molecules. For this reason, the process
releases significant amounts of thermal energy (heat)
.
Can you have smoke without fire?
But under overload, short circuit or internal heat for any reason… 590DM is a huge amount of smoke. It doesn’t take an actual fire to cause an emergency evacuation,
smoke with no fire is more common
, extremely costly not to mention a major risk to life!
