ASTM D5771-03

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An American National Standard
Designation: D 5771 – 03
Designation: 444/99
Standard Test Method for
Cloud Point of Petroleum Products (Optical Detection
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Stepped Cooling Method)
This standard is issued under the fixed designation D 5771; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number 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
petroleum products Test Method D 2500 using an automatic apparatus. The temperature results from
this test method have been found to be equivalent to Test Method D 2500. When specification requires
Test Method D 2500, do not substitute this test method or any other method without obtaining
comparative data and agreement from the specifier.
1. Scope* D 4177 Practice for Automatic Sampling of Petroleum and
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Petroleum Products
1.1 This test method describes the determination of the
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2.2 IP 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
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2.3 Other Standard:
instrument using an optical device.
IEC 751 Industrial Platinum Resistance Thermometer Sen-
1.2 This test method covers the range of temperatures
sors
from −60 to +49°C with temperature resolution of 0.1°C,
however, the range of temperatures included in the 1997
3. Terminology
interlaboratory cooperative test program only covered the
3.1 Definitions:
temperature range of –56 to +34°C.
3.1.1 biodiesel, n—fuel comprised of mono-alkyl esters of
1.3 The values stated in SI units are to be regarded as the
long chain fatty acids derived from vegetable oils or animal
standard. The values given in parentheses are for information
fats, designated B 100.
only.
3.1.1.1 Discussion—Biodiesel is typically produced by a
1.4 This standard does not purport to address all of the
reaction of vegetable oil or animal fat with an alcohol such as
safety concerns, if any, associated with its use. It is the
methanol or ethanol in the presence of a catalyst to yield
responsibility of the user of this standard to establish appro-
mono-esters and glycerin. The fuel typically may contain up to
priate safety and health practices and determine the applica-
14 different types of fatty acids that are chemically transformed
bility of regulatory limitations prior to use.
into fatty acid methyl esters (FAME).
2. Referenced Documents 3.1.2 biodiesel blend, n—a blend of biodiesel fuel with
petroleum-based diesel fuel designated BXX, where XX is the
2.1 ASTM Standards:
volume % of biodiesel.
D 2500 Test Method for Cloud Point of Petroleum Prod-
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3.1.3 cloud point, n—in petroleum products and biodiesel
ucts
fuels, the temperature of a liquid specimen when the smallest
D 4057 Practice for Manual Sampling of Petroleum and
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observable cluster of wax crystals first appears upon cooling
Petroleum Products
under prescribed conditions.
3.1.3.1 Discussion—The cloud point appears when the tem-
perature of the specimen is low enough to cause wax crystals
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This test method is under the jurisdiction of ASTM Committee D02 on
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee
D02.07 on Flow Properties.
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Current edition approved July 10, 2003. Published August 2003. Originally Available from the Institute of Petroleum, 61 New Cavendish St., London,
approved in 1995. Last previous edition approved in 2002 as D 5771–02. England WIM 8AR.
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Annual Book of ASTM Standards, Vol 05.01. Available from International Electrotechnical Commission, P.O. 131, 3 Rue de
3
Annual Book of ASTM Standards, Vol 05.06. 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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D5771–03
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
to precipitate. In homogeneous liquids, the cloud is always 4. Summary of Test Method
noted first at the location in the specimen where the specimen
4.1 After insertion of the specimen into the apparatus, and
temperature is the lowest. This is typically at the lower portion
the initiation of the program, the specimen is cooled according
of the test jar when using the apparatus described in Test
to the cooling profile listed in Table 1.
...