ASTM D5949-01e1
(Test Method)Standard Test Method for Pour Point of Petroleum Products (Automatic Pressure Pulsing Method)
Standard Test Method for Pour Point of Petroleum Products (Automatic Pressure Pulsing Method)
SIGNIFICANCE AND USE
The pour point of a petroleum product is an index of the lowest temperature of its utility for certain applications. Flow characteristics, like pour point, can be critical for the correct operation of lubricating oil systems, fuel systems, and pipeline operations.
Petroleum blending operations require precise measurement of the pour point.
In most cases, this test method does not require the use of mechanical refrigeration apparatus (see 7.1).
This test method yields a pour point in a format similar to Test Method D 97/IP15 when the 3°C interval results are reported.
Note 2—Since some users may wish to report their results in a format similar to Test Method D 97 (in 3°C intervals) the precisions were derived from the temperatures rounded to the 3° intervals. For statements on bias relative to Test Method D 97, see 13.3.
Test results from this test method can be determined at either 1 or 3°C intervals.
This test method has better repeatability and reproducibility relative to Test Method D 97/IP15 as measured in the 1992 and 1998 interlaboratory test programs.5
SCOPE
1.1 This test method covers the determination of pour point of petroleum products by an automatic instrument that applies a controlled burst of nitrogen gas onto the specimen surface while the specimen is being cooled and detects movement of the surface of the test specimen with an optical device.
1.2 This test method is designed to cover the range of temperatures from 57 to +51C. However, the range of temperatures included in the 1992 interlaboratory test program only covered the temperature range from 39 to +6C and the range of temperatures included in the 1998 interlaboratory test program was from 51 to 11C. (see 13.4).
1.3 Test results from this test method can be determined at 1 or 3C testing intervals.
1.4 This test method is not intended for use with crude oils.
Note 1—The applicability of this test method or residual fuel samples has not been verified. For further information on applicability, refer to 13.4.
1.5 The values stated in SI units are regarded as standard.
1.6 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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An American National Standard
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Designation:D5949–01
Standard Test Method for
Pour Point of Petroleum Products (Automatic Pressure
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Pulsing Method)
This standard is issued under the fixed designation D5949; 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.
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e NOTE—Footnote 6 was updated editorially in August 2005.
INTRODUCTION
This test method covers an alternative procedure for the determination of pour point of petroleum
products using an automatic apparatus.
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1. Scope* Petroleum Products
D4177 Practice for Automatic Sampling of Petroleum and
1.1 This test method covers the determination of pour point
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Petroleum Products
of petroleum products by an automatic instrument that applies
2.2 IP Standard:
a controlled burst of nitrogen gas onto the specimen surface
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IP15 Test Method for Pour Point of Petroleum Products
while the specimen is being cooled and detects movement of
the surface of the test specimen with an optical device.
3. Terminology
1.2 This test method is designed to cover the range of
3.1 Definitions:
temperatures from−57 to+51°C. However, the range of tem-
3.1.1 pour point, n—in petroleum products, the lowest
peratures included in the 1992 interlaboratory test program
temperature at which movement of the test specimen is
only covered the temperature range from −39 to+6°C and the
observed under the prescribed conditions of the test.
range of temperatures included in the 1998 interlaboratory test
3.2 Definitions of Terms Specific to This Standard:
program was from −51 to −11°C. (see 13.4).
3.2.1 no-flow point, n—in petroleum products, the tempera-
1.3 Test results from this test method can be determined at
ture of the test specimen at which a wax crystal structure or
1 or 3°C testing intervals.
viscosity increase, or both, impedes movement of the surface
1.4 This test method is not intended for use with crude oils.
of the test specimen under the conditions of the test.
NOTE 1—The applicability of this test method or residual fuel samples
3.2.1.1 Discussion—The no-flow point occurs when, upon
has not been verified. For further information on applicability, refer to
cooling, the formation of wax crystal structures or viscosity
13.4.
increase,orboth,hasprogressedtothepointwheretheapplied
1.5 The values stated in SI units are regarded as standard.
observation device no longer detects movement under the
1.6 This standard does not purport to address all of the
conditions of the test. The preceding observation temperature,
safety concerns, if any, associated with its use. It is the
at which flow of the test specimen is last observed, is the pour
responsibility of the user of this standard to establish appro-
point.
priate safety and health practices and determine the applica-
3.2.2 pulse, n—a controlled burst of nitrogen gas of a fixed
bility of regulatory limitations prior to use.
pressure and flow rate sufficient to cause movement on the
surface of the test specimen without fracturing the wax
2. Referenced Documents
structure which may be formed in the specimen.
2.1 ASTM Standards:
3.2.3 Peltier device, n—a solid-state thermoelectric device
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D97 Test Method for Pour Point of Petroleum Products
constructed with dissimilar semiconductor materials, config-
D4057 Practice for Manual Sampling of Petroleum and
ured in such a way that it will transport heat to or away from
a test specimen dependent on the direction of electric current
applied to the device.
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This test method is under the jurisdiction of ASTM Committee D02 on
PetroleumProductsandLubricantsandisthedirectresponsibilityofSubcommittee
D02.07 on Flow Properties.
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Current edition approved Dec. 10, 2001. Published February 2002. Originally Annual Book of ASTM Standards, Vol 05.02.
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published as D5949–96. Last previous edition D5949–96. AvailablefromInstituteofPetroleum,61NewCavendishSt.,London,England
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Annual Book of ASTM Standards, Vol 05.01. W1M 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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D5949–01
4. Summary of Test Method surface movement, and recording the temperature of the
specimen as described in detail inAnnexA1. It is specifically
4.1 Afterinsertingthetestspecimenintotheautomaticpour
designed to detect the lowest temperature at which movement
point apparatus, and initiation of the test program, the test
of the surface of the specimen is observed upon application of
specimenisheatedandthencooledbyaPeltierdeviceatarate
the pulse.
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