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 entire test subject is then placed in a constant temperature cooling bath on top coud a gasket to prevent excessive cooling. The wax crystals typically first form at the lower circumferential wall with the appearance of a whitish or milky cloud. It uses automatic apparatus and has been found to be equivalent to test method D Unsourced material may be challenged and removed.

This behavior is characteristic of non-ionic surfactants containing polyoxyethylene chains, which exhibit reverse solubility versus temperature behavior poibt water and therefore “cloud out” at some point as the temperature is raised.

Additionally, no external chiller bath or refrigeration unit is needed. Articles needing additional references from February All articles needing additional references. An array of optical detectors continuously monitor the sample for the first appearance of a cloud of wax crystals. Archived from the original on Less operator time is required to run the test using this automatic method. A cork carrying the test thermometer is used to close the jar.


The cloud point is the temperature just above where these crystals first appear.

This page was last edited on 5 Octoberat Glycols demonstrating this behavior are known as “cloud-point glycols” and are used as shale inhibitors. Results are reported with a temperature resolution of 0.

February Learn how and when to remove this template message. Therefore, cloud point indicates the tendency of the oil to plug filters or small orifices at cold operating temperatures. During this period, the sample is continuously illuminated by a light source. 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.

Retrieved from ” https: The thermometer bulb is positioned to rest at the bottom of the jar.

Cloud point – Wikipedia

Please help improve this article by adding citations to reliable sources. The test sample is first poured into a test jar to a level approximately half full. In these conditions, olive oil begins to develop white, waxy clumps of solidified oil that sink to the bottom of the container.

An everyday example of cloud point can be seen in olive oil stored in cold weather. By using this site, you agree to the Terms of Use and Privacy Policy. In the petroleum industry, cloud point refers to the temperature below which wax in diesel or biowax in biodiesels forms a cloudy appearance. Views Read Edit View history. From Wikipedia, the free encyclopedia.


Cloud point

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. In crude or heavy oils, cloud point is synonymous with wax appearance temperature WAT and wax precipitation temperature WPT.

The presence of solidified waxes thickens the oil and clogs fuel filters and injectors in engines. The D test method determines the cloud point in a shorter period of time than manual method D Successively lower temperature cooling baths may be used depending on the cloud point.

This article needs additional citations for verification. The temperature at which the first appearance of wax crystals is detected in the sample is determined to be the cloud point.

The cloud point is affected by salinitybeing generally lower in more saline fluids. The Olive Oil Source.