![]() ![]() When the vapor/air mixture reaches a temperature sufficient to self ignite, the observed temperature is the Autoignition Point. Liquid is heated, but without an ignition source. The observed temperature when the burning becomes continuous is the Fire Point. The ignitions repeat as the liquid temperature continues to rise. The observed temperature when the flame momentarily ignites the vapor/air mixture is the Flash Point. When the lower flammability limit is reached, the ignition source will ignite the vapor/air mixture, causing a pop. As the liquid gets hotter, more of it evaporates causing the fuel/air mixture above the liquid to gradually become richer. A small flame is mechanically passed back and forth just above the surface of the liquid. The liquid to be tested is heated in a cup and the rising liquid temperature is continuously measured. The lowest temperature at which a heated liquid's vapors in air will selfignite and burn, without exposure to any ignition source. The lowest temperature at which a heated liquid's vapor/air mixture will burn continuously when combustion is supported by ignition sources such as the above. The lowest temperature at which a heated liquid's vapor/air mixture can be ignited ("flashed") by a flame or spark, or other ignition source placed above the liquid surface. ![]() ![]() Three major technical terms describe flammability conditions in hydrocarbon liquids and their vapors flash point, fire point, and autoignition temperature. Piston Engines - Displacement - Calculate piston engine displacement. Technical Data Sheet: Leakage in Thermal Oil Systems, Flash and Fire Points Demystified.Oil Lubrication - Temperature Limits - Temperature limits for lubricating oils.Octane Liquid - Thermal Properties - Density, specific heat, thermal conductivity and more.temperature for propane, n-butane, n-heptane and n-pentane hydrocarbons. Hydrocarbons - Vapor Pressure - Vapor pressure vs.Hydrocarbons - Autoignition Temperatures and Flash Points - Autoignition temperatures and flash points (☌ and ☏) of different types of hydrocarbons with varying carbon numbers up to C12.Gases - Explosion and Flammability Concentration Limits - Flame and explosion limits for gases like propane, methane, butane, acetylene and more.Fuels and Chemicals - Autoignition Temperatures - Autoignition points for fuels and chemicals like butane, coke, hydrogen, petroleum and more.Fuels - Higher and Lower Calorific Values - Higher and lower calorific values (heating values) for fuels like coke, oil, wood, hydrogen and others.Flash Points - The flash point of a chemical indicates how easy it may ignite and burn.Chemicals - Formulas and Trading Names - Formulas and trading names for some common chemicals.Butane - Thermophysical Properties - Chemical, physical and thermal properties of n-Butane.Biomasses - Energy Content Used as Fuel - Biomass fuels and their energy content.Alternative Fuels - Properties - Properties of alternative fuels like biodiesel, E85, CNG and more.Risk, Reliability and Safety - Risk, reliability and safety in process control systems.Combustion - Boiler house topics, fuels like oil, gas, coal, wood - chimneys, safety valves, tanks - combustion efficiency. ![]()
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