ASTM D5771-05

Standard Test Method for Cloud Point of Petroleum Products (Optical Detection Stepped Cooling Method)

SIGNIFICANCE AND USE
For petroleum products and biodiesel fuels, the cloud point 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 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, when rounded to the next lower integer, are equivalent to Test Method D 2500. Refer to 12.2.
This test method is more precise than Test Method D 2500.
Note 1—According to interlaboratory examination, the reproducibility of this test method has been found to be more precise than Test Method D 2500.
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 an optical device.
1.2 This test method covers the range of temperatures from 60 to +49°C with temperature resolution of 0.1°C, however, the range of temperatures included in the 1997 interlaboratory cooperative test program only covered the temperature range of -56 to +34°C.
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.

General Information

• Status: Historical
• Publication Date: 30-Jun-2005
• ICS: 75.160.20 - Liquid fuels
• Technical Committee: D02 - Petroleum Products, Liquid Fuels, and Lubricants
• Drafting Committee: D02.07 - Flow Properties

Relations

• Replaces: ASTM D5771-04 - Standard Test Method for Cloud Point of Petroleum Products (Optical Detection Stepped Cooling Method)
• Effective Date: 01-Jul-2005
• Replaced By: ASTM D5771-10 - Standard Test Method for Cloud Point of Petroleum Products (Optical Detection Stepped Cooling Method)
• Effective Date: 01-May-2010
• Referred By: ASTM D7467-20a - Standard Specification for Diesel Fuel Oil, Biodiesel Blend (B6 to B20)
• Effective Date: 01-Jul-2005
• Referred By: ASTM D975-23 - Standard Specification for Diesel Fuel
• Effective Date: 01-Jul-2005
• Referred By: ASTM D6371-17a - Standard Test Method for Cold Filter Plugging Point of Diesel and Heating Fuels
• Effective Date: 01-Jul-2005
• Referred By: ASTM D6751-23a - Standard Specification for Biodiesel Fuel Blendstock (B100) for Middle Distillate Fuels
• Effective Date: 01-Jul-2005

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:D5771–05
Designation: 444/99
Standard Test Method for
Cloud Point of Petroleum Products (Optical Detection
1
Stepped Cooling Method)
This standard is issued under the fixed designation D5771; 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 (´) 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
petroleum products Test Method D2500 using an automatic apparatus. The temperature results from
thistestmethodhavebeenfoundtobeequivalenttoTestMethodD2500.Whenspecificationrequires
Test Method D2500, do not substitute this test method or any other method without obtaining
comparative data and agreement from the specifier.
1. Scope* D4057 Practice for Manual Sampling of Petroleum and
Petroleum Products
1.1 This test method describes the determination of the
D4177 Practice for Automatic Sampling of Petroleum and
cloud point of petroleum products and biodiesel fuels that are
Petroleum Products
transparent in layers 40 mm in thickness, by an automatic
3
2.2 Energy Institute Standard:
instrument using an optical device.
3
IP219 TestMethodforCloudPointofPetroleumProducts
1.2 This test method covers the range of temperatures
4
2.3 Other Standard:
from−60 to+49°C with temperature resolution of 0.1°C,
IEC 751 Industrial Platinum Resistance Thermometer Sen-
however, the range of temperatures included in the 1997
sors
interlaboratory cooperative test program only covered the
temperature range of –56 to +34°C.
3. Terminology
1.3 The values stated in SI units are to be regarded as the
3.1 Definitions:
standard. The values given in parentheses are for information
3.1.1 biodiesel, n—fuel comprised of mono-alkyl esters of
only.
long chain fatty acids derived from vegetable oils or animal
1.4 This standard does not purport to address all of the
fats, designated B 100.
safety concerns, if any, associated with its use. It is the
3.1.1.1 Discussion—Biodiesel is typically produced by a
responsibility of the user of this standard to establish appro-
reaction of vegetable oil or animal fat with an alcohol such as
priate safety and health practices and determine the applica-
methanol or ethanol in the presence of a catalyst to yield
bility of regulatory limitations prior to use.
mono-estersandglycerin.Thefueltypicallymaycontainupto
2. Referenced Documents 14differenttypesoffattyacidsthatarechemicallytransformed
2
into fatty acid methyl esters (FAME).
2.1 ASTM Standards:
3.1.2 biodiesel blend, n—a blend of biodiesel fuel with
D2500 Test Method for Cloud Point of Petroleum Products
petroleum-based diesel fuel designated BXX, where XX is the
volume % of biodiesel.
1
This test method is under the jurisdiction of ASTM Committee D02 on
3.1.3 cloud point, n—in petroleum products and biodiesel
PetroleumProductsandLubricantsandisthedirectresponsibilityofSubcommittee
fuels, the temperature of a liquid specimen when the smallest
D02.07 on Flow Properties.
Current edition approved July 1, 2005. Published August 2005. Originally
approved in 1995. Last previous edition approved in 2004 as D5771–04. DOI:
10.1520/D5771-05.
2 3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or Available from the Energy Institute, 61 New Cavendish St., London, England
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM WIG 7AR, U.K.
4
Standards volume information, refer to the standard’s Document Summary page on Available from International Electrotechnical Commission, P.O. 131, 3 Rue de
the ASTM website. Varembe, CH-Geneve 1211–2.0.
*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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D5771–05
TABLE 1 Jacket and Specimen Cooling Temperatures
Specimen Temperature, °C Jacket Temperature, °C
ST >+10 06 0.5
+10$ ST > − 7 −17.26 0.5
−7$ ST > − 24 −34.2 6 0.5
−24$ ST > − 41 −51.26 0.5
−41$ ST > − 58 −68.26 0.5
−58$ ST > − 75 −85.26 0.5
observable cluster of hydrocarbon crystals first occurs upon D2500, although, according to interlaboratory examination the
cooling under prescribed conditions. results have been determined to be equivalent to Test Method
3.1.3.1 Discussion—The cloud point occurs when the tem- D2500.
perature of the specimen is low enough to cause hydrocarbon 3.2.2 D2500/IP219equivalentcloudpoint, n—thetempera-
crystals to precipitate. In a homogeneous liquid, the cloud is ture of a specimen, in integers, calculated by rounding the
always noted first at the location in the
...