test method may not apply to samples with ASTM color higher than cloud point, n—in petroleum products and biodiesel This standard does not. Download/Embed scientific diagram | ASTM-D Cloud Point Test Apparatus from publication: Cloud Point and Wax Deposition Measurement Techniques. In the petroleum industry, cloud point refers to the temperature below which wax in diesel or ASTM D, Standard Test Method of Cloud Point of Petroleum Products (Constant Cooling Rate Method) is an The D test method determines the cloud point in a shorter period of time than manual method D .
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The temperature at which the first appearance of wax crystals is detected in the sample is determined to be the cloud point. Articles needing additional references from February All articles needing additional references.
Lower temperature cooling bath must have temperature stability not less than 1. The wax also accumulates on cold surfaces producing, for example, pipeline or heat exchanger fouling and forms an emulsion with water. The wax crystals typically first xloud at the lower circumferential wall with the appearance of a whitish or milky cloud. In crude or heavy oils, cloud point is synonymous with wax appearance temperature Pint and wax precipitation temperature WPT.
February Learn how and when to remove this template message. An everyday example of cloud point can be seen in olive oil stored in cold weather.
The Olive Oil Source. The D test method determines the cloud point in a shorter period of time than manual method D The presence of solidified waxes thickens the oil and clogs fuel filters and injectors in engines.
The test sample is first poured poimt a test jar to a level approximately half full. During this period, the sample is continuously illuminated by a light source.
Retrieved from ” https: Therefore, cloud point indicates the tendency of the oil to plug filters or small orifices at cold operating temperatures. Archived from the original on Please help improve this article by adding citations to reliable sources.
This behavior is characteristic of non-ionic surfactants containing polyoxyethylene chains, which exhibit reverse solubility versus temperature behavior in water and therefore “cloud out” at some point as the temperature is raised. The cloud point is the temperature just above where these crystals first appear. Glycols demonstrating this behavior are axtm as “cloud-point glycols” and are used as shale inhibitors. The thermometer bulb is positioned to rest at the bottom of the jar.
ASTM D – 02 Standard Test Method for Cloud Point of Petroleum Products
The cloud point of a nonionic surfactant or glycol solution is the temperature at which the mixture starts to phase-separate, and two phases appear, thus becoming cloudy. It uses automatic apparatus and has been found d25500 be c2500 to test method D Views Read Edit View history. This page was last edited on 5 Octoberat In these conditions, olive oil begins to develop white, waxy clumps of solidified oil that sink to the bottom of the container.
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ASTM D – 17a Standard Test Method for Cloud Point of Petroleum Products and Liquid Fuels
The entire test subject is then placed in a constant temperature cooling bath on top of a gasket to prevent excessive cooling. An array of optical detectors continuously monitor the sample for the first appearance of a cloud of wax crystals.
Additionally, no external chiller bath or refrigeration unit is needed. A cork carrying the test thermometer is used to close the jar. The cloud point is affected by salinitybeing generally lower in more saline fluids. Successively lower temperature cooling baths may be used depending on the cloud point. In the petroleum industry, cloud point refers to the temperature below which wax in diesel or biowax in biodiesels forms a cloudy appearance. From Wikipedia, the free encyclopedia.
Unsourced material may be challenged and removed. Less operator time is required to run the test using this automatic method.