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The D5773 test method determines the cloud point in a shorter period of time than manual method D2500. Less operator time is required to run the test using this automatic method. Additionally, no external chiller bath or refrigeration unit is needed. D5773 is capable of determining cloud point within
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The test sample is first poured into a test jar to a level approximately half full. A cork carrying the test thermometer is used to close the jar. The thermometer bulb is positioned to rest at the bottom of the jar. The entire test subject is then placed in a constant temperature cooling bath on top
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Under ASTM D5773, the test sample is cooled by a
Peltier device at a constant rate of 1.5 +/- 0.1 °C/min. During this period, the sample is continuously illuminated by a light source. An array of optical detectors continuously monitor the sample for the first appearance of a cloud of wax
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At every 1 °C, the sample is taken out and inspected for cloud then quickly replaced. Successively lower temperature cooling baths may be used depending on the cloud point. Lower temperature cooling bath must have temperature stability not less than 1.5 K for this test.
114:) at around 4 °C, whereas winter temperatures in temperate countries can often be colder than 0 °C. In these conditions, olive oil begins to develop white, waxy clumps/spheres of solidified oil that sink to the bottom of the container.
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ASTM D5773, Standard Test Method of Cloud Point of
Petroleum Products (Constant Cooling Rate Method) is an alternative to the manual test procedure. It uses automatic apparatus and has been found to be equivalent to test method D2500.
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forms a cloudy appearance. The presence of solidified waxes thickens the oil and clogs fuel filters and injectors in engines. The wax also accumulates on cold surfaces (producing, for example, pipeline or heat exchanger
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D2500). The wax crystals typically first form at the lower circumferential wall with the appearance of a whitish or milky cloud. The cloud point is the temperature just above where these crystals first appear.
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at which the mixture starts to phase-separate, and two phases appear, thus becoming cloudy. This behavior is characteristic of non-ionic surfactants containing
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chains, which exhibit reverse solubility versus temperature behavior in water and therefore "cloud out" at some point as the temperature is raised.
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71:). When the temperature is below 0 °C, the dew point is called the frost point, as water vapour undergoes gas-solid phase transition called
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crystals. The temperature at which the first appearance of wax crystals is detected in the sample is determined to be the cloud point.
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An everyday example of cloud point can be seen in olive oil stored in cold weather. Olive oil begins to solidify (via liquid-solid
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455:"ASTM D5773 - 21 Standard Test Method for Cloud Point of Petroleum Products and Liquid Fuels (Constant Cooling Rate Method)"
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a temperature range of -60 °C to +49 °C. Results are reported with a temperature resolution of 0.1 °C.
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with water. Therefore, cloud point indicates the tendency of the oil to plug filters or small orifices at cold
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The test oil is required to be transparent in layers 40 mm in thickness (in accordance with
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is the temperature below which a transparent solution undergoes either a liquid-liquid
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demonstrating this behavior are known as "cloud-point glycols" and are used as
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Steven A., Treese; Peter R., Pujado; David S. J., Jones (2015).
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Manufacturer of ASTM D5773 automatic cloud point analyzers
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In crude or heavy oils, cloud point is synonymous with
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308:Measuring cloud point of petroleum products
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47:. The cloud point is analogous to the '
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82:refers to the temperature below which
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401:(2 ed.). Springer. p. 79.
63:(humid air) to form liquid water (
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158:. The cloud point is affected by
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399:Handbook of Petroleum Processing
128:The cloud point of a nonionic
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423:"Definition from dcpetroleum"
123:wax precipitation temperature
16:Temperature point in liquids
78:In the petroleum industry,
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357:Cold filter plugging point
119:wax appearance temperature
51:' at which a gas-liquid
35:to form either a stable
443:. The Olive Oil Source.
86:in diesel or biowax in
105:operating temperatures
498:Edible oil chemistry
441:"Freezing olive oil"
493:Chemical properties
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31:or a liquid-solid
488:Phase transitions
408:978-3-319-14528-0
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167:Phase transitions
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472:Phase Technology
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425:. Archived from
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334:Automatic method
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112:phase separation
53:phase transition
33:phase transition
25:phase separation
19:In liquids, the
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367:Krafft point
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277:Condensation
260:Vaporization
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84:paraffin wax
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61:water vapour
57:condensation
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241:Sublimation
169:of matter (
141:temperature
80:cloud point
45:precipitate
27:to form an
21:cloud point
482:Categories
384:References
378:Pour point
284:Ionization
272:Deposition
156:inhibitors
130:surfactant
121:(WAT) and
88:biodiesels
73:deposition
59:occurs in
41:suspension
373:Petroleum
362:Gel point
49:dew point
351:See also
253:Freezing
160:salinity
137:solution
97:emulsion
29:emulsion
290:Plasma
249:Liquid
236:Melting
149:Glycols
139:is the
125:(WPT).
93:fouling
55:called
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230:Solid
224:Plasma
214:Liquid
134:glycol
69:clouds
209:Solid
153:shale
39:or a
403:ISBN
319:ASTM
268:Gas
204:From
219:Gas
132:or
101:sol
99:or
67:or
65:dew
37:sol
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201:To
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