ASTM D5773-05
(Test Method)Standard Test Method for Cloud Point of Petroleum Products (Constant Cooling Rate Method)
Standard Test Method for Cloud Point of Petroleum Products (Constant Cooling Rate Method)
SIGNIFICANCE AND USE
The cloud point of petroleum products and biodiesel fuels is an index of the lowest temperature of their utility for certain applications. Wax crystals of sufficient quantity can plug filters used in some fuel systems.
Petroleum blending operations require a precise measurement of the cloud point.
This test method can determine the temperature of the test specimen at which wax crystals have formed sufficiently to be observed as a cloud with a resolution of 0.1°C.
This test method provides results that are equivalent to Test Method D 2500.
Note 1—This is based on the Test Method D 2500 equivalent cloud point in which the 0.1°C result is rounded to the next lower integer.
This test method determines the cloud point in a shorter period of time than Test Method D 2500.
Note 2—In cases of samples with cloud points near ambient temperatures, time savings may not be realized.
This test method eliminates most of the operator time required of Test Method D 2500.
This test method does not require the use of a mechanical refrigeration apparatus.
Note 3—In certain cases of high ambient temperature, a source of cooling water may be required to measure low temperature cloud points (see 7.1).
SCOPE
1.1 This test method describes the determination of the cloud point of petroleum products and biodiesel fuels that are transparent in layers 40 mm in thickness by an automatic instrument using a constant cooling rate.
1.2 This test method covers the range of temperatures from 60 to +49C with temperature resolution of 0.1C, however, the range of temperatures included in the 1997 interlaboratory cooperative test program only covered the temperature range of -56 to +34C.
1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Standards Content (Sample)
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An American National Standard
Designation:D5773–05
Designation: 446/99
Standard Test Method for
Cloud Point of Petroleum Products (Constant Cooling Rate
1
Method)
This standard is issued under the fixed designation D5773; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
INTRODUCTION
This test method describes an alternative procedure for the determination of cloud point of
petroleumproductsTestMethodD2500/IP219usinganautomaticapparatus.Thetemperatureresults
from this test method have been found to be equivalent to Test Method D2500/IP219. When
specification requires Test Method D2500/IP219, do not substitute this test method or any other
method without obtaining comparative data and agreement from the specifier.
1. Scope* D4177 Practice for Automatic Sampling of Petroleum and
Petroleum Products
1.1 This test method describes the determination of the
2.2 Energy Institute Standard:
cloud point of petroleum products and biodiesel fuels that are
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IP219 Test Method for Cloud Point of Petroleum Products
transparent in layers 40 mm in thickness by an automatic
instrument using a constant cooling rate.
3. Terminology
1.2 This test method covers the range of temperatures from
3.1 Definitions:
−60 to +49°C with temperature resolution of 0.1°C, however,
3.1.1 biodiesel, n—afuelcomprisedofmono-alkylestersof
the range of temperatures included in the 1997 interlaboratory
long-chain fatty acids derived from vegetable oils or animal
cooperativetestprogramonlycoveredthetemperaturerangeof
fats, designated B100.
–56 to +34°C.
3.1.1.1 Discussion—Biodiesel is typically produced by a
1.3 The values stated in SI units are to be regarded as the
reaction of vegetable oil or animal fat with an alcohol such as
standard. The values given in parentheses are for information
methanol or ethanol in the presence of a catalyst to yield
only.
mono-estersandglycerin.Thefueltypicallymaycontainupto
1.4 This standard does not purport to address all of the
14differenttypesoffattyacidsthatarechemicallytransformed
safety concerns, if any, associated with its use. It is the
into fatty acid methyl esters (FAME).
responsibility of the user of this standard to establish appro-
3.1.2 biodiesel blend, n—a blend of biodiesel fuel with
priate safety and health practices and determine the applica-
petroleum-based diesel fuel designated BXX, where XX is the
bility of regulatory limitations prior to use.
volume percentage of biodiesel.
2. Referenced Documents 3.1.3 cloud point, n—in petroleum products and biodiesel
2
fuels, the temperature of a liquid specimen when the smallest
2.1 ASTM Standards:
observable cluster of hydrocarbon crystals first occurs upon
D2500 TestMethodforCloudPointofPetroleumProducts
cooling under prescribed conditions.
D4057 Practice for Manual Sampling of Petroleum and
3.1.3.1 Discussion—The cloud point occurs when the tem-
Petroleum Products
perature of the specimen is low enough to cause hydrocarbon
crystals to precipitate. In a homogeneous liquid, the cloud is
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This test method is under the jurisdiction of ASTM Committee D02 on always noted first at the location in the specimen where the
PetroleumProductsandLubricantsandisthedirectresponsibilityofSubcommittee
specimen temperature is the lowest. The cloud point is the
D02.07 on Flow Properties.
temperatureatwhichthecrystalsfirstoccur,regardlessoftheir
Current edition approved June 15, 2005. Published July 2005. Originally
approved in 1995. Last previous edition approved in 2004 as D5773–04.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
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Standards volume information, refer to the standard’s Document Summary page on Available from the Energy Institute, 61 New Cavendish Street, London,
the ASTM website. England WIM 8AR.
*A Summary of Changes section appears at the end of this standard.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D5773–05
locationinthespecimen,andnotafterextensivecrystallization 5.3 This test method can determine the temperature of the
has taken place. The hydrocarbon crystals that precipitate at testspecimenatwhichwaxcrystalshaveformedsufficientlyto
lower temperatures are typically, but not excluded to, straight be observed as a cloud with a resolution of 0.1°C.
chain hydrocarbons commonly called “wax crystals.” 5.4 This test method provides results that are equivalent to
3.1.3.2 Discussion—The purpose of the cloud point is to Test Meth
...
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