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 wax also accumulates on cold surfaces producing, for example, pipeline or heat exchanger fouling and forms an emulsion with water.

The D test method determines the cloud point in a shorter period of time than manual method D 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. Additionally, no external chiller bath or refrigeration unit is needed. Archived from the original on February Learn how and when to remove this template message.

By using this site, you agree to the Terms of Use and Privacy Policy. In these conditions, olive oil begins to develop white, waxy clumps of solidified oil that sink to the bottom of the container. Successively lower temperature cooling baths may be used depending on the cloud point.


The thermometer bulb is positioned to rest at the bottom of the jar. An everyday example of cloud point can be seen in olive oil stored in cold weather.

Less operator time is required to run the test using this automatic method. Therefore, cloud point indicates the tendency of the oil to plug filters or small orifices at cold operating temperatures.

Cloud point

A cork carrying the test thermometer is used to close the jar. From Wikipedia, the free encyclopedia. Views Read Edit View history. The cloud point is affected by salinitybeing generally lower in more saline fluids. 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.

This article needs additional citations for verification. Retrieved from ” https: It uses automatic apparatus and has been found to be equivalent to test method D An array of optical detectors continuously monitor the sample for the first appearance of a cloud of wax crystals.

Glycols demonstrating this behavior are known as atm glycols” and are used as shale inhibitors. In crude or heavy oils, cloud point is synonymous with wax appearance temperature WAT and wax precipitation temperature WPT.

The entire test subject is then placed in a constant temperature cooling bath on top of a gasket to prevent excessive cooling.


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

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. During this period, the sample is continuously illuminated by a light source.

Please help improve this polnt by adding citations to reliable sources. The Olive Oil Source. This page was last edited on 5 Octoberat Unsourced material may be challenged and removed.

Lower temperature cooling bath must have temperature stability not less than 1. The cloud point is the temperature just above where these crystals first appear.

Cloud point – Wikipedia

Results are reported with a temperature resolution of 0. The wax crystals typically first form at the lower circumferential wall with the appearance of a whitish or milky cloud. Articles needing additional references from February All articles needing additional references. The temperature at which the first appearance of wax crystals is detected in the sample is determined to be 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.