Singapore Fire Safety Engineering Guidelines 2015_1.pdf

Fire safety engineering 2 1218 stage of fire

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Fire safety engineering [2] 1.2.18 Stage of fire transition to a state of total surface involvement in a fire of combustible materials within an enclosure. Flashover [2] 1.2.19 Fractional effective dose (FED). The fraction of the dose (of toxic gases or thermal effects) that would render a person of average susceptibility incapable of escape. FED [2] 1.2.20 State of total involvement of combustible materials in a fire. Fully developed fire [2] 1.2.21 Thermal energy produced by combustion of unit mass of a given substance (kJ/g). Heat of combustion [2] 1.2.22 Thermal energy produced by combustion (Joules). Heat release [2] 1.2.23 Heat release rate (HRR). Rate of thermal energy production generated by combustion (kW or MW). HRR [2] 1.2.24 State of physical inability of occupants to accomplish a specific task. Incapacitated [2] 1.2.25 Measure of the attenuation of a light beam passing through smoke expressed as the logarithm to the base 10 of the opacity of smoke. Optical density of smoke [2] 1.2.26 Ratio of incident light intensity to transmitted light intensity through smoke under specified conditions. Opacity of smoke [2] 1.2.27 Pre-movement time is the time interval between occupants being informed to evacuate and the time in which they begin to travel to a safe location. Pre-movement time
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14 1.2.28 A Registered Inspector (R.I.) is a person who is registered under the Fire Safety Act to be qualified and competent to inspect fire safety works in buildings to ascertain the degree of compliance of fire safety requirements. Registered Inspector 1.2.29 Time required for escape. This is the calculated time period required for the occupants to travel from their location at the time of fire ignition to a place of safety. RSET [2] 1.2.30 Response Time Index (RTI). The measure of the reaction time to a fire phenomenon of the sensing element of a fire safety device. RTI [2] 1.2.31 Barrier that exhibits fire integrity, structural adequacy, thermal insulation, or a combination of these for a period of time under specified conditions (in a fire resistance test). Separating element [2] 1.2.32 Amount of smoke produced per unit time in a fire or fire test. Smoke production rate [2] 1.2.33 Extinction area of smoke produced by a test specimen in a given time period, divided by the mass lost from the test specimen in the same time period. Specific extinction area [2] 1.2.34 In the context of the standard test for fire resistance, is the time in minutes for which a prototype specimen has continued to carry its applied load within defined deflection limits. Structural adequacy [2] 1.2.35 Flame spread away from the source of ignition across the surface of a liquid or a solid. Surface spread of flame [2] 1.2.36 The distance required to be traversed from the most remote point in any room or space to the edge of a door opening directly to a) an exit staircase, or b) an exit passageway, or c) an open exterior space.
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