ASTM D5773-95

Designation: D 5773 – 95 An American National Standard
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 D 5773; 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/IP219 using an automatic apparatus. The temperature results
from this test method have been found to be equivalent to Test Method D 2500/IP219. When
specification requires Test Method D 2500/IP219, do not substitute this test method or any other
method without obtaining comparative data and agreement from the specifier.
4
1. Scope IP219 Test Method for Cloud Point of Petroleum Products
1.1 This test method describes the determination of the
3. Terminology
cloud point of petroleum products that are transparent in layers
3.1 Definitions:
40 mm in thickness by an automatic instrument using a
3.1.1 cloud point, n—in petroleum products, the tempera-
constant cooling rate.
ture of a liquid specimen when a wax crystal structure that is
1.2 This test method covers the range of temperatures
similar in appearance to a cloud is formed upon cooling under
from −40°C to +49°C with temperature resolution of 0.1°C.
prescribed conditions.
1.3 The values stated in SI units are to be regarded as the
3.1.1.1 Discussion—The cloud point appears when the tem-
standard. The values given in parentheses are for information
perature of the specimen is low enough to cause wax crystals
only.
to precipitate. In a homogeneous liquid, the cloud is always
1.4 This standard does not purport to address all of the
noted first at the location in the specimen where the specimen
safety concerns, if any, associated with its use. It is the
temperature is the lowest. This is typically at the lower portion
responsibility of the user of this standard to establish appro-
of the test jar when using the apparatus described in Test
priate safety and health practices and determine the applica-
Method D 2500.
bility of regulatory limitations prior to use.
3.2 Description of Terms Specific to This Standard:
2. Referenced Documents 3.2.1 automatic cloud point, n—the temperature of a speci-
men, when the appearance of the cloud is determined under the
2.1 ASTM Standards:
conditions of this test method.
D 2500 Test Method for Cloud Point of Petroleum Prod-
2
3.2.1.1 Discussion—The cloud point in this test method is
ucts
determined by an automatic instrument using an optical device
D 4057 Practice for Manual Sampling of Petroleum and
3
for detection of the crystal formation. The apparatus and the
Petroleum Products
conditions are different from those established for Test Method
D 4177 Practice for Automatic Sampling of Petroleum and
3
D 2500, although according to interlaboratory examination, the
Petroleum Products
results have been determined to be equivalent to Test Method
2.2 IP Standard:
D 2500.
3.2.2 D 2500/IP219 equivalent cloud point, n—the tem-
perature of a specimen, in integers, calculated by rounding the
1
This test method is under the jurisdiction of ASTM Committee D-2 on results of this test method to the next lower integer.
Petroleum Products and Lubricantsand is the direct responsibility of Subcommittee
3.2.2.1 Discussion—This test method produces results with
D02.07on Flow Properties.
Current edition approved Sept. 10, 1995. Published November 1995.
2
Annual Book of ASTM Standards, Vol 05.01.
4
3
IP standards are available from the Institute of Petroleum, 61 New Cavendish
Annual Book of ASTM Standards, Vol 05.02.
Street, London, England WIM 8AR.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
D 5773
0.1°C resolution. Should the user wish to provide results with 6. Apparatus
5
a similar format to Test Method D 2500, then this calculation
6.1 Automatic Apparatus —The automatic cloud point ap-
can be performed. Some apparatus can perform this calculation
paratus described in this test method consists of a test chamber
automatically.
controlled by a microprocessor that is capable of controlling
3.2.3 Peltier device, n—a solid state thermoelectric device the heating and cooling of the test specimen, optically observ-
constructed with dissimilar semiconductor materials and con- ing the first appearance of a cloud of wax crystals and
recording the temperature of the specimen described in detail
figured in such a way that it will transfer heat to or away from
in Annex A1.
a test specimen dependent on the direction of electric current
6.2 The apparatus shall be equipped with a specimen cup,
applied to
...