File Name: definition of flash point and fire point .zip
Flash point: the lowest temperature at which vapours above a liquid will ignite when exposed to an ignition source. For example, the flash point of a No. Materials transported above their flash points present a significant risk of fire if they come into contact with electrical equipment, electrostatic sparks, automotive ignition systems, open flames, and other ignition systems.
Download as a PDF file. Fluid to be tested is placed in a cup along with a temperature probe. The cup is placed on a hot plate and an ignition source gas flame or electric arc is located just above the cup. The hot plate is turned on. As it heats up, the fluid produces vapors. This is the flash point.
And, because of its low cost, simplicity and versatility, the test is popular among the used oil analysis community as well. The flash point is the lowest temperature at which the vapor above the oil sample will momentarily ignite or flash when an ignition source is passed over it. The flash point typically degrees C or degrees F for mineral oils is an indication of the safety hazards of a lubricant with respect to fire and explosion. However, the flash point should not be confused with the auto ignition temperature AIT , which is the temperature typically degrees C or to degrees F for mineral oils at which the oil vapor will combust spontaneously without an ignition source. This is an important property of fire-resistant hydraulic fluids in EHC systems on steam turbines. According to ASTM, which first standardized the test in , the flash point is the lowest temperature at which an ignition source causes the vapors of the specimen lubricant to ignite under specified conditions.
Historical Version s - view previous versions of standard. Work Item s - proposed revisions of this standard. More D It is only one of a number of properties that should be considered in assessing the overall flammability hazard of a material. Consult the particular regulation involved for precise definitions of these classifications. For example, an abnormally low flash point on a test specimen of engine oil can indicate gasoline contamination.
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The flash point of a volatile material is the lowest temperature at which its vapors ignite if given an ignition source. The flash point is sometimes confused with the autoignition temperature , the temperature that causes spontaneous ignition. The fire point is the lowest temperature at which the vapors keep burning after the ignition source is removed. It is higher than the flash point, because at the flash point more vapor may not be produced fast enough to sustain combustion. The flash point is a descriptive characteristic that is used to distinguish between flammable fuels, such as gasoline also known as petrol , and combustible fuels, such as diesel.
Fire safety includes fire signs, tags and labels from Safety Emporium. Flash point is the lowest temperature at which a liquid can gives off vapor to form an ignitable mixture in air near the surface of the liquid.
The flash point of a material is the lowest temperature at which the application of test flame causes the vapours from the material momentarily catch fire in the form of a flash under specified conditions of test. In practical view the fire point is the lowest temperature at which the application of test flame causes the material to ignite and burn at least for 5 seconds under specified conditions of test. At high temperatures, bituminous materials emit hydrocarbon vapours which are susceptible to catch fire. Therefore the heating temperature of bituminous material should be restricted to avoid hazardous conditions. Flash point and fire point tests are used to determine the temperature to which bituminous material can safely be heated. To determine flash point and fire point of the bituminous material.
Autoignition Temperature Defined The lowest temperature at which a heated liquid's vapors in air will selfignite and burn, without exposure to any ignition source. Flash Point and Fire Point Testing The liquid to be tested is heated in a cup and the rising liquid temperature is continuously measured. A small flame is mechanically passed back and forth just above the surface of the liquid. The ignitions repeat as the liquid temperature continues to rise. The observed temperature when the burning becomes continuous is the Fire Point. Autoignition Point Testing Liquid is heated, but without an ignition source.
Using continuously closed cup flash point standards ASTM D and ASTM D
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