ASTM D5771-95

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

SCOPE
1.1 This test method describes the determination of the cloud point of petroleum products 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 -40 to +49°C with temperature resolution of 0.1°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: 31-Dec-1994
• ICS: 75.160.20 - Liquid fuels
• Technical Committee: D02 - Petroleum Products, Liquid Fuels, and Lubricants
• Drafting Committee: D02.07 - Flow Properties

Relations

• Replaced By: ASTM D5771-02 - Standard Test Method for Cloud Point of Petroleum Products (Optical Detection Stepped Cooling Method)
• Effective Date: 10-Apr-2002

Standards Content (Sample)

Designation: D 5771 – 95 An American National Standard
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Test Method for
Cloud Point of Petroleum Products (Optical Detection
1
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.
5
1. Scope 2.3 Other Standard:
IEC 751 Industrial Platinum Resistance Thermometer Sen-
1.1 This test method describes the determination of the
sors
cloud point of petroleum products that are transparent in layers
40 mm in thickness, by an automatic instrument using an
3. Terminology
optical device.
3.1 Definition:
1.2 This test method covers the range of temperatures
3.1.1 cloud point, n— in petroleum products, the tempera-
from −40 to +49°C with temperature resolution of 0.1°C.
ture of a liquid specimen, when a wax crystal structure, that is
1.3 The values stated in SI units are to be regarded as the
similar in appearance to a cloud, is formed upon cooling under
standard. The values given in parentheses are for information
prescribed conditions.
only.
3.1.1.1 Discussion—The cloud point appears when the tem-
1.4 This standard does not purport to address all of the
perature of the specimen is low enough to cause wax crystals
safety concerns, if any, associated with its use. It is the
to precipitate. In homogeneous liquids, the cloud is always
responsibility of the user of this standard to establish appro-
noted first at the location in the specimen where the specimen
priate safety and health practices and determine the applica-
temperature is the lowest. This is typically at the lower portion
bility of regulatory limitations prior to use.
of the test jar when using the apparatus described in Test
Method D 2500.
2. Referenced Documents
3.2 Definitions of Terms Specific to This Standard:
3.2.1 automatic cloud point, n—the temperature of a speci-
2.1 ASTM Standards:
men when the appearance of the cloud is determined under the
D 2500 Test Method for Cloud Point of Petroleum Prod-
2
conditions of this test method.
ucts
3.2.1.1 Discussion—The cloud point in this test method is
D 4057 Practice for Manual Sampling of Petroleum and
3
determined by an automatic instrument using an optical device
Petroleum Products
for detection of the crystal formation. The apparatus and the
D 4177 Practice for Automatic Sampling of Petroleum and
3
conditions are different from those established for Test Method
Petroleum Products
4
D 2500, although, according to interlaboratory examination the
2.2 IP Standard:
results have been determined to be equivalent to Test Method
4
IP219 Test Method for Cloud Point of Petroleum Products
D 2500.
3.2.2 D 2500/IP219equivalent cloud point, n—the tempera-
ture of a specimen, in integers, calculated by rounding the
1
results of this test method to the next lower integer.
This test method is under the jurisdiction of ASTM Committee D-2 on
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee
3.2.2.1 Discussion—This test method produces results with
D02.07 on Flow Properties.
0.1°C resolution. Should the user wish to provide results with
Current edition approved Sept. 10, 1995. Published November 1995.
2
Annual Book of ASTM Standards, Vol 05.01.
3
Annual Book of ASTM Standards, Vol 05.06.
4 5
IP standards are available from the Institute of Petroleum, 61 New Cavendish Available from International Electrotechnical Commission, P.O. 131, 3 Rue de
St., London, England WiM 8AR. Varembe, CH-Geneve 1211–2.0.
1

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D 5771
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 −51.2 6 0.5
−41 $ ST > − 58 −68.2 6 0.5
−58 $ ST > − 75 −85.2 6 0.5
of this test method has been found to be more precise than Test Method
a similar format to Test Method D 2500, then this calculation
D 2500.
can be performed. Some apparatus can perform this calculation
automatically.
6. Apparatus
6
4. Summary of Test Method 6.1 Optical Cloud Point Apparatus —The automated cloud
point apparatus (see Fig. 1 ) described in this test meth
...