What is a cellulosic fire?
Cellulosic Fire (CF) – This kind of fire occurs when the fuel source is comprised primarily of cellulose material such as timber or paper. A fire of this nature has a slow flame and spreads – by comparison – gradually. This type of fire is most common in residential and commercial buildings.
What are hydrocarbon fires?
Class B hydrocarbon fires are combustible liquid fires. Hydrocarbons are composed of carbon and hydrogen. They are fuels non-miscible with water due to their non-affinity for water.
What is hydrocarbon fire curve?
The Hydrocarbon curve is applicable where small petroleum fires might occur, i.e. car fuel tanks, petrol or oil tankers, certain chemical tankers, etc. The temperature development of the Hydrocarbon (HC) fire curve is described by the following equation: T = 20 + 1080 * (1 – 0,325 * e – 0,167 * t – 0,675 * e-2,5 * t).
What is a jet fire?
A jet or spray fire is a turbulent diffusion flame resulting from the combustion of a fuel continuously released with some significant momentum in a particular direction or directions. Jet fires represent a significant element of the risk associated with major accidents on offshore installations.
Which hydrocarbon is used as a 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.
How do you extinguish 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 parametric fire curves?
The parametric-fire curves representing the natural fires are in terms of a fast and a slow parametric-fire as shown in Fig. 1. For both fire scenarios, the design value of fire load density (qt,d) is taken as 200 MJ/m 2 , considering the compartment to be a representative of an office building.
What are the stages of a wildfire?
Compartment fire development can be described as being comprised of four stages: incipient, growth, fully developed and decay (see Figure 1). Flashover is not a stage of development, but simply a rapid transition between the growth and fully developed stages.
What is a cellulose and example?
The definition of cellulose is the main substance that makes up the cell walls and fibers of plants. An example of cellulose is the 30% of a tree that can be made into paper. A polysaccharide, (C6 H10 O5 )n , that is composed of glucose monomers and is the main constituent of the cell walls of plants.
What is cellulose for class seventh?
Cellulose is a carbohydrate which is not digested by humans but it is digested by ruminants.
What causes jet fire?
A jet fire occurs when a flammable liquid or gas is ignited after its release from a pressurized, punctured vessel or pipe. The pressure of release generates a long flame, which is stable under most conditions. A flash flame may take the form of jet flame on reaching the spill point.