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 .
| Author: | Jushicage Sakora |
| Country: | Brazil |
| Language: | English (Spanish) |
| Genre: | Finance |
| Published (Last): | 5 October 2013 |
| Pages: | 282 |
| PDF File Size: | 2.18 Mb |
| ePub File Size: | 6.43 Mb |
| ISBN: | 831-6-44915-248-5 |
| Downloads: | 73604 |
| Price: | Free* [*Free Regsitration Required] |
| Uploader: | Temi |
This behavior is characteristic of non-ionic surfactants containing polyoxyethylene chains, which exhibit reverse solubility versus temperature poin 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. The thermometer bulb is positioned to rest at the bottom of the jar. Successively lower temperature cooling baths may be used depending on the cloud point. 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.
The Olive Oil Source. This page was last edited on 5 Octoberat It uses automatic apparatus and has been found to be equivalent d25000 test method D By using this site, you agree to the Terms of Use and Privacy Policy. Retrieved from ” https: Articles needing additional references from February All articles needing additional references.
The cloud point is affected by salinitybeing generally lower in more saline fluids. The entire test subject is then placed in a constant temperature cooling bath on top of a gasket to prevent excessive cooling.
Glycols demonstrating this behavior are known as “cloud-point glycols” and are used as shale inhibitors. This article needs additional citations for verification. 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. The wax crystals typically first form at the lower circumferential wall with the appearance of a whitish or milky cloud. During this period, pkint sample is continuously illuminated by a light source.
Cloud point – Wikipedia
Please help improve this article by adding citations to reliable sources. In these conditions, olive oil begins to s2500 white, waxy clumps of solidified oil that sink to the bottom of the container. From Wikipedia, the free encyclopedia. Lower temperature cooling bath must have temperature stability not less than 1.
Cloud point
Views Read Edit View history. In the petroleum industry, cloud point refers to the temperature below which wax in diesel or biowax in biodiesels forms a cloudy appearance. The wax also accumulates on cold surfaces producing, for example, pojnt or heat exchanger fouling and forms an emulsion with water.
The presence of solidified waxes thickens the oil and clogs fuel filters and injectors in engines.
Unsourced material may be challenged and removed. A cork carrying the test thermometer is used to close the jar. Results are reported with a temperature resolution of 0. The temperature at which the first appearance of wax crystals is detected in the sample is determined to be the cloud point.
Therefore, cloud point indicates the tendency of the oil to plug filters or small orifices at cold operating temperatures. The D test method determines the cloud point in a shorter period of time than manual method D Archived from the original on In crude or heavy oils, cloud point is synonymous with wax appearance temperature WAT and wax precipitation temperature WPT.
The test sample is first poured into a test jar to a level approximately half full.
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. Less operator time is required to run the test using this automatic method.
