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 asfm in the sample is determined to be the cloud point.

Cloud point – Wikipedia

Less operator time is required to run the test using this automatic method. The presence of solidified waxes thickens the oil and clogs fuel filters and injectors in engines.

The test sample is first poured into a test jar to a level approximately half full. Articles needing additional references from February Vloud articles needing additional references.

Glycols demonstrating this behavior are known as “cloud-point glycols” and are used as shale inhibitors.

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Cloud point

In crude or heavy oils, cloud point is synonymous with wax appearance temperature WAT and wax precipitation temperature WPT. Results are reported with a temperature resolution of 0.

The thermometer bulb is positioned to rest at the bottom of the jar. Views Read Edit View history. A cork carrying the test thermometer is used to close the jar.

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. Adtm wax crystals typically first form at the lower circumferential wall with the appearance of a whitish or milky cloud. Therefore, cloud point indicates the tendency of the oil to plug filters or small orifices at cold operating temperatures.

Retrieved from ” https: From Wikipedia, the free encyclopedia. Archived from the original on The entire test subject is then placed in a constant temperature cooling bath on top of a gasket to prevent excessive cooling.

The wax also accumulates on cold surfaces producing, for example, pipeline or heat exchanger fouling and forms an emulsion with water. Successively lower temperature cooling baths may be used depending on the cloud point.

The Olive Oil Source. By using this site, you agree to the Terms poiny Use and Privacy Policy. An everyday example of cloud point can be seen in olive oil stored in cold weather.

ASTM D – 17a Standard Test Method for Cloud Point of Petroleum Products and Liquid Fuels

In the petroleum industry, cloud point refers to the temperature below which wax in diesel or biowax in biodiesels forms a cloudy appearance. 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.


This page was last edited on 5 Octoberat An array of optical detectors continuously monitor the sample for the first appearance of a cloud of wax crystals. The D test method determines the cloud point in a shorter period of time than manual method D It uses automatic apparatus and has been found to be equivalent to test method D Additionally, no external chiller bath or refrigeration unit is needed. This article needs additional citations for verification.

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Lower temperature cooling bath cloyd have temperature stability not less than 1. In these conditions, olive oil begins to develop white, waxy clumps of solidified oil that sink to the bottom of the container. During this period, the sample is continuously illuminated by a light source.

The cloud point is the temperature just asgm where these crystals first appear. The cloud point is affected by salinitybeing generally lower in more saline fluids.

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