ASTM D5985-02
(Test Method)Standard Test Method for Pour Point of Petroleum Products (Rotational Method)
Standard Test Method for Pour Point of Petroleum Products (Rotational 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, such as pour point, can be critical for the correct operation of lubricating systems, fuel systems, and pipeline operations.
Petroleum blending operations require precise measurement of the pour point.
This test method can determine the temperature of the test specimen with a resolution of 0.1°C at which either crystals have formed or viscosity increases sufficiently to impede movement of the petroleum product.
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 for the temperatures rounded to the 3°C intervals. For statements on bias relative to Test Method D 97, see 13.3.
This test method has better repeatability and comparable reproducibility relative to Test Method D 97 as measured in the 1992 interlaboratory program.5
SCOPE
1.1 This test method covers the determination of pour point of petroleum products by an automatic instrument that continuously rotates the test specimen against a suspended detection device during cooling of the test specimen.
1.2 This test method is designed to cover the range of temperatures from -57 to + 51°C; however, the range of temperatures included in the 1992 interlaboratory program only covered the temperature range of -39 to + 6°C (see 13.4).
1.3 This test method determines the no-flow point of petroleum products by detection of the crystal structure or viscosity increase, or both, in the sample that is sufficient to impede flow of the specimen.
1.4 This test method is not intended for use with crude oils.
Note 1—The applicability of this test method on residual fuel samples has not been verified. For further information on applicability, refer to .
1.5 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.
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.
General Information
Relations
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
An American National Standard
Designation:D5985–02
Standard Test Method for
1
Pour Point of Petroleum Products (Rotational Method)
This standard is issued under the fixed designation D5985; 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.
INTRODUCTION
This test method covers an alternative procedure for the determination of pour point of petroleum
products using an automatic apparatus.
1. Scope* D4177 Practice for Automatic Sampling of Petroleum and
3
Petroleum Products
1.1 This test method covers the determination of pour point
2.2 IP Standards:
of petroleum products by an automatic instrument that con-
4
IP15 Test Method for Pour Point of Petroleum Products
tinuously rotates the test specimen against a suspended detec-
tion device during cooling of the test specimen.
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
3.1.1 pour point, n—in petroleum products, the lowest
temperatures included in the 1992 interlaboratory program
temperature at which movement of the test specimen is
onlycoveredthetemperaturerangeof−39to+6°C(see13.4).
observed under prescribed conditions of test.
1.3 This test method determines the no-flow point of petro-
3.2 Definitions of Terms Specific to This Standard:
leum products by detection of the crystal structure or viscosity
3.2.1 no-flow point, n—in petroleum products, the tempera-
increase,orboth,inthesamplethatissufficienttoimpedeflow
ture of the test specimen at which a wax crystal structure or
of the specimen.
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 on residual fuel samples
3.2.2 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, or both, have progressed to the point where the
1.5 The values stated in inch-pound units are to be regarded
applied observation device no longer detects movement under
as the standard. The values given in parentheses are for
the conditions of the test. The preceding observation tempera-
information only.
ture, at which flow of the test specimen is last observed, is the
1.6 This standard does not purport to address all of the
pour point.
safety concerns, if any, associated with its use. It is the
3.2.3 pour point at 3°C testing intervals, n—in petroleum
responsibility of the user of this standard to establish appro-
products, the temperature calculated by rounding the no-flow
priate safety and health practices and determine the applica-
point of the test specimen to the next higher integer which is a
bility of regulatory limitations prior to use.
multiple of 3°C.
3.2.4 Discussion—The no-flow point can be measured with
2. Referenced Documents
a resolution of 0.1°C in this test method. In Test MethodD97
2.1 ASTM Standards:
observations for no-flow are in 3°C intervals and when results
2
D97 Test Method for Pour Point of Petroleum Products
with a similar format to Test MethodD97 are required, this
D4057 Practice for Manual Sampling of Petroleum and
calculation shall be performed. Some apparatus can perform
3
Petroleum Products
this calculation automatically.
3.2.5 rotational, n—in this standard, the technique of turn-
ingthetestspecimenjarinanuprightpositionuponaturntable
1
This test method is under the jurisdiction of ASTM Committee D02 on
with a stationary positioned, temperature sensor containing
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee
D02.07 on Flow Properties. pendulum, inserted into the test specimen.
Current edition approved Jan. 10, 2002. Published March 2002. Originally
e1
published as D5985–96. Last previous edition D5985–96 .
2 4
Annual Book of ASTM Standards, Vol 05.01. AvailablefromInstituteofPetroleum,61NewCavendishSt.,London,England
3
Annual Book of ASTM Standards, Vol 05.02. 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.
1
---------------------- Page: 1 ----------------------
D5985–02
3.2.6 Discussion—Upon cooling of the test specimen, the 6.2 Test Specimen Cup—The test specimen cup is a flat
resultant crystal formation or viscosity increase in the speci- bottomaluminumcupwiththedimensionsinA1.2.Toindicate
men exerts force upon the pendulum, off
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.