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V=1.40 – {(0.266) (1.40) (0.40)}V= 1.40 – 0.14896V= 1.25104Time= Distance/ Time= 30/ 1.25104=23.98Seconds9. Comparison of answers in question 7 and 8When the density increases, the number of people within a given compartment increases. Since, the egress is designed to support specific number of people; the increase in number of people reduces mobility. Thus, increase in density will decrease the number of people who will be evacuated while decrease in density will increase the number of people who will be evacuated (Diamantes 2004). 10. Stages of Fire DevelopmentFires that are in compartment are usually discussed in terms of temperature development resulting in a number of stages.

These stages are five, which include ignition, growth, flashover, fully developed fire and decay. Ignition – this is the time that there is exothermic reaction due to increase of temperature and in can be caused by either spontaneous ignition or piloted ignition. The resulting combustion will be either smouldering combustion or flaming combustion. Growth – after ignition the fire can either grow fast or slow but the rate is dependent on the type of fuel, type of combustion, access to oxygen and surrounding interactions.

A smouldering fire releases low energy while produces hazardous amount of toxic gases while flaming combustion results in rapid flame that spreads over its surfaces e. g. fuel packages; those fires that access sufficient oxygen are said to be fuel controlled. Flashover – this is the transition period between growth and developed stage. This stage may be viewed in terms of temperature; the temperature should be between 500 and 600 degrees centigrade or the flames appear from the enclosing of the compartment. Such occurrences may be attributed to fuel position, conditions in the upper layer, fuel orientation, fuel properties and enclosure geometry. Fully Developed Fire – this is the time that the fire is at its greatest and may be attributed to factors such as limited availability of oxygen.

This stage may also be called as ventilation controlled burning since the oxygen that is required for the burning process comes from the compartments openings. At this stage, the temperatures usually range 700 to 1200 degrees Celsius (Gipson 2003). Decay – this is the last stage in which the fuel is consumed and the rate of energy released diminishes translating in decrease of temperature within the compartment.

Moreover, this stage may result in temperatures going from ventilation controlled to fuel controlled. 11. Consideration of fire hazard progressionIt is paramount to consider the progression of fire hazard during the time of evacuation to decrease extent of damage. Understanding fire progression will reduce fire fighters fatalities especially because of traumatic causes. Thus, understanding the development of fires with provide means into which strategies will be developed to ensure that the fire and rescue missions are successful (Gipson 2003).

Moreover, the fire fighters will ensure that the people within the building at the time of incident are effectively evacuated to safety. Therefore, it provides means to recognise fire behaviours understand the development of fire and implement the appropriate control measures to ensure that the entire process is effective. 12. Important stage for evacuation during fire development

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