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D92_11(16b)

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Fill the test cup with the sample, so that the top of the meniscus of the test specimen is level with the filling mark. And position the test cup on the center of the heating plate. The temperature of the test cup and the sample shall not exceed 56 degrees Celsius or 100 degrees Fahrenheit below the expected flash point. If too much test specimen has been added to the cup, remove the excess using a syringe or similar device for withdrawal of fluid. However, if there is test specimen on the outside of the test cup, empty, clean, and refill it. Destroy any air bubbles or foam on the surface of the test specimen with a sharp knife or other suitable device, and maintain the required level of the test specimen. If a foam persists during the final stages of the test, terminate the test and disregard any results. Solid material shall not be added to the test cup. Solid or viscous samples shall be heated until they are fluid before being poured into the test cup. However, the temperature of the sample during heating shall not exceed 56 degrees Celsius or 100 degrees Fahrenheit below the expected flash point. Light the test flame. And adjust it to a diameter of 3.2 to 4.8 millimeters, or 1/8 to 3/16 of an inch, or to the size of the comparison bead if one is mounted on the apparatus. See Annex A1. Warning, gas pressure supplied to the apparatus must not be allowed to exceed 3 kilopascals or 12 inches of water pressure. Warning, exercise care when using a gas test flame. If it should be extinguished, it will not ignite the vapors in the test cup. And the gas for the test flame that then enters the vapor space can influence the result. Warning, the operator shall exercise care and take appropriate safety precautions during the initial application of the test flame, since test specimens containing low flash material can give an abnormally strong flash when the test flame is first applied. Warning, the operator shall exercise care and take appropriate safety precautions during the performance of this test method. The temperatures attained during this test, up to 400 degrees Celsius or 752 degrees Fahrenheit, are considered hazardous. Some preliminary test flame applications during the initial heating phase may be useful in detecting whether unexpected, volatile material is present in the sample. A typical interval is at the beginning of the initial heating phase, and then every 10 degrees Celsius up to the standard test flame application temperature. See section 11.1.5. Apply heat initially at such a rate that the temperature, as indicated by the temperature measuring device, increases 5 to 17 degrees Celsius or 9 to 30 degrees Fahrenheit per minute. When the test specimen temperature is approximately 56 degrees Celsius or 100 degrees Fahrenheit below the expected flash point, decrease the heat, so that the rate of temperature rise during the last 28 degrees Celsius or 50 degrees Fahrenheit before the flash point is 5 to 6 degrees Celsius or 9 to 11 degrees Fahrenheit per minute. With low flash point material, or with highly viscous material, it is advised to use the 5 to 6 degrees Celsius permanent heating rate from the start of the test method to the end. Apply the test flame when the temperature of the test specimen is approximately 28 degrees Celsius below the expected flash point, and each time thereafter, at a temperature reading that is a multiple of 2 degrees Celsius. Pass the test flame across the center of the test cup at right angles to the diameter, which passes through the temperature measuring device. With a smooth, continuous motion, apply the test flame, either in a straight line, or along the circumference of a circle having a radius of at least 150 plus or minus 1 millimeters, or 6 plus or minus 0.039 inches. The center of the test flame shall move in a horizontal plane not more than 2 millimeters over 564th of an inch above the plane of the upper edge of the test cup, and passing in one direction only. At the time of the next test flame application, pass the test flame in the opposite direction of the preceding application. The time consumed in passing the test flame across the test cup in each case shall be approximately 1 plus or minus 0.1 seconds. Some automated apparatus pass the test flame in one single direction. Apparatus that operate in this manner will typically shut off the test flame gas after each application. Return to the starting position without creating a draft near and over the test cup, and the test flame will be re-lighted in such a manner that no fuel gas enters the cup vapor space before the next test application. When determining the flash point of asphalt, it is recommended to carefully move fully to one side, such as with a spatula, any surface film formed before each application of the ignition source. Available data indicates that higher flash point is observed for asphalt samples when surface film formed is not moved aside, compared to the flash point observed when the surface film is moved aside prior to the application of the ignition source. An alternative to the moving aside of the formed surface film can be found in Appendix X1. During the last 28 degrees Celsius or 50 degree Fahrenheit rise in temperature prior to the expected flash point, care shall be taken to avoid disturbing the vapors in the test cup with rapid movements or drafts near the test cup. When a foam persists on top of the test specimen during the last 28 degrees Celsius or 50 degrees Fahrenheit rise in temperature prior to the expected flash point, terminate the test, and disregard any results. Meticulous attention to all details relating to the test flame, size of the test flame, rate of temperature increase, and rate of passing the test flame over the test specimen is required for proper results. When testing a sample whose expected flash point temperature is not known, bring the test specimen in the test cup to a temperature no greater than 50 degrees Celsius or 122 degrees Fahrenheit. Or if the sample required heating to be transferred into the test cup, bring the test specimen in the test cup to that temperature. Apply the test flame in the manner described in Section 11.1.5, beginning at least 5 degrees Celsius or 9 degrees Fahrenheit above the starting temperature. Continue heating the test specimen at 5 to 6 degrees Celsius or 9 to 11 degrees Fahrenheit per minute, and testing the test specimen every 2 degrees Celsius or 5 degrees Fahrenheit as described in Section 11.1.5 until the flash point is obtained. Flash point results determined in an unknown expected flash point mode should be considered approximate. This value can be used as the expected flash point when a fresh specimen is tested in a standard mode of operation. Record as the observed flash point the reading on the temperature measuring device at the time the test flame causes a distinct flash in the interior of the test cup. The sample is deemed to have flashed when a large flame appears at any point on the surface of the test specimen, and instantaneously propagates itself over the surface of the test specimen. The application of the test flame can cause a blue halo, or an enlarged flame, prior to the actual flash point. This is not a flash point, and shall be ignored. When a flash point, or fire point, is detected during any preliminary test flame application, or on the first application of the test flame, see section 11.1.5. The test shall be discontinued, the result discarded, and the test repeated with a fresh test specimen. The first application of the test flame with the fresh test specimen shall be at least 28 degrees Celsius or 50 degrees Fahrenheit below the temperature found when the flash point was detected under the conditions in section 11.1.12. When the apparatus has cooled down to a safe handling temperature, less than 60 degrees Celsius or 140 degrees Fahrenheit, remove the test cup. And clean the test cup and the apparatus as recommended by the manufacturer. Exercise care when cleaning the apparatus, so as not to damage or dislocate the automated flashed detection system when used or temperature measuring device. See the manufacturer's instructions for proper care and maintenance. To determine the fire point, continue heating the test specimen after recording the flash point, such that the test specimen temperature increases at a rate of 5 to 6 degrees Celsius or 9 to 11 degrees Fahrenheit per minute. Continue the application of the test flame at 2 degrees Celsius or 5 degree Fahrenheit intervals until the test specimen ignites and sustains burning for a minimum of 5 seconds. Record the temperature of the test specimen when the test flame which caused the test specimen to ignite was applied. Sustain burning as the observed fire point of the test specimen. When the apparatus has cooled down to a safe handling temperature, less than 60 degrees Celsius or 140 degrees Fahrenheit, remove the test cup. And clean the test cup and the apparatus as recommended by the manufacturer.

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Duration: 10 minutes and 21 seconds
Country:
Language: English
License: Dotsub - Standard License
Genre: None
Views: 5
Posted by: abuckmaster on Jul 17, 2018

D92_11(16b)

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