ASTM D7346-12
(Test Method)Standard Test Method for No Flow Point and Pour Point of Petroleum Products
Standard Test Method for No Flow Point and Pour Point of Petroleum Products
SIGNIFICANCE AND USE
The no flow point of a petroleum product is an index of the lowest temperature of its utility for some applications. Flow characteristics, such as no flow point, can be critical for the proper operation of lubricating systems, fuel systems, and pipeline operations.
Petroleum blending operations require precise measurement of the no flow point.
5.3 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 has increased sufficiently, or both, to impede flow of the petroleum product.
5.4 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.
5.5 Petroleum blending operations require precise measurement of the pour point.
5.6 Pour point results from this test method can be reported at either 1 or 3°C intervals.
5.7 This test method yields a pour point in a format similar to Test Method D97/IP15 when the 3°C interval results are reported.
5.8 This test method has better repeatability and reproducibility relative to Test Method D97/IP15 as measured in the 2011 interlaboratory test program (see 13.1.2).
SCOPE
1.1 This test method covers the determination of the no flow point temperature and pour point of petroleum products using an automatic instrument.
1.2 The measuring range of the apparatus is from -95 to 45°C, however the precision statements were derived only from samples with no flow point temperatures from -77 to +2°C and samples with pour point in the temperature range of -58 to +12°C.
1.3 Pour point results from this test method can be reported at 1 or 3°C intervals.
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.5 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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Designation: D7346 − 12
StandardTest Method for
1
No Flow Point and Pour Point of Petroleum Products
This standard is issued under the fixed designation D7346; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope 3. Terminology
1.1 Thistestmethodcoversthedeterminationofthenoflow 3.1 Definitions:
point temperature and pour point of petroleum products using
3.1.1 pour point, n—in petroleum products, the lowest
an automatic instrument.
temperature at which movement of the test specimen is
observed under the prescribed conditions of the test.
1.2 The measuring range of the apparatus is from -95 to
45°C, however the precision statements were derived only
3.2 Definitions of Terms Specific to This Standard:
from samples with no flow point temperatures from -77 to
3.2.1 no-flow point, n—in petroleum products, the tempera-
+2°C and samples with pour point in the temperature range of
ture of the test specimen at which a wax crystal structure
-58 to +12°C.
formation or viscosity increase, or both, is sufficient to impede
1.3 Pour point results from this test method can be reported movement of the surface of the test specimen under the
at 1 or 3°C intervals. conditions of the test.
3.2.1.1 Discussion—The no-flow point occurs when, upon
1.4 The values stated in SI units are to be regarded as
cooling, the formation of wax crystal structures or viscosity
standard. No other units of measurement are included in this
increase, or both, have progressed to the point where the
standard.
applied observation device no longer detects movement under
1.5 This standard does not purport to address all of the
the conditions of the test.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
4. Summary of Test Method
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
4.1 After inserting the test specimen into the automatic no
flow point apparatus and initiating the program, the test
2. Referenced Documents
specimen is heated, if necessary, to a starting temperature and
2
2.1 ASTM Standards: then cooled by prescribed rates. The test specimen is continu-
D97 Test Method for Pour Point of Petroleum Products ously tested for flow characteristics by continuously monitor-
D4057 Practice for Manual Sampling of Petroleum and ing the air pressure variation inside the test specimen vial.
Petroleum Products
When the specimen is still fluid, its movement will partially
D4177 Practice for Automatic Sampling of Petroleum and compensateforthereductioninairpressureinthetestchamber
Petroleum Products
above the test specimen surface. At some temperature the
D6300 Practice for Determination of Precision and Bias pressure measuring system detects a pressure decrease due to
Data for Use in Test Methods for Petroleum Products and
incapability of the test specimen to flow caused by a crystal
Lubricants structure formation in the specimen or its viscosity increase, or
D6708 Practice for StatisticalAssessment and Improvement both. This temperature is recorded as no flow point with a
of Expected Agreement Between Two Test Methods that resolutionof0.1°C.Thepourpointisrecordedbyroundingthe
Purport to Measure the Same Property of a Material no flow point temperature to either the next warmer 1°C
interval or 3°C interval. The test specimen is then reheated to
allow for removal from the test chamber.
1
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. 5. Significance and Use
Current edition approved June 1, 2012. Published August 2012. Originally
5.1 The no flow point of a petroleum product is an index of
approved in 2007. Last previous edition approved in 2007 as D7346–07. DOI:
10.1520/D7346–12.
thelowesttemperatureofitsutilityforsomeapplications.Flow
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
characteristics, such as no flow point, can be critical for the
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
proper operation of lubricating systems, fuel systems, and
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. pipeline operations.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
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D7346 − 12
5.2 Petroleum blending operations require precise measure- 7.3 Micropipette—Capable of delivering 0.5 6
...
This document is not anASTM standard and is intended only to provide the user of anASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:D7346–07 Designation:D7346–12
Standard Test Method for
No Flow Point of Petroleum ProductsNo Flow Point and
1
Pour Point of Petroleum Products
This standard is issued under the fixed designation D7346; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1This test method covers the determination of the no flow point temperature of petroleum products using an automatic
instrument.
1.2The measuring range of the apparatus is from -95 to 45°C, however the precision statements were derived only from samples
with no flow point temperatures from -77 to +2°C.
1.3The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.4
1.1 This test method covers the determination of the no flow point temperature and pour point of petroleum products using an
automatic instrument.
1.2 Themeasuringrangeoftheapparatusisfrom-95to45°C,howevertheprecisionstatementswerederivedonlyfromsamples
with no flow point temperatures from -77 to +2°C and samples with pour point in the temperature range of -58 to +12°C.
1.3 Pour point results from this test method can be reported at 1 or 3°C intervals.
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.5 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.
2. Referenced Documents
2
2.1 ASTM Standards:
D97 Test Method for Pour Point of Petroleum Products
D4057 Practice for Manual Sampling of Petroleum and Petroleum Products
D4177 Practice for Automatic Sampling of Petroleum and Petroleum Products
D6300 Practice for Determination of Precision and Bias Data for Use in Test Methods for Petroleum Products and Lubricants
Practice for Determination of Precision and Bias Data for Use in Test Methods for Petroleum Products and Lubricants
D6708 Practice for Statistical Assessment and Improvement of Expected Agreement Between Two Test Methods that Purport
to Measure the Same Property of a Material
3. Terminology
3.1Definitions of Terms Specific to This Standard:
3.1 Definitions:
3.1.1 pour point, n—in petroleum products, the lowest temperature at which movement of the test specimen is observed under
the prescribed conditions of the test.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 no-flow point, n—in petroleum products, the temperature of the test specimen at which a wax crystal structure formation
or viscosity increase, or both, is sufficient to impede movement of the surface of the test specimen under the conditions of the test.
3.1.1.1
3.2.1.1 Discussion—Theno-flowpointoccurswhen,uponcooling,theformationofwaxcrystalstructuresorviscosityincrease,
1
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.
Current edition approved July 15, 2007. Published August 2007. DOI: 10.1520/D7346-07.
Current edition approved June 1, 2012. Published August 2012. Originally approved in 2007. Last previous edition approved in 2007 as D7346–07. DOI:
10.1520/D7346–12.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1
---------------------- Page: 1 ----------------------
D7346–12
or both, have progressed to the point where the applied observation device no longer detects movement under the conditions of
the test.
4. Summary of Test Method
4.1 After inserting the test specimen into the automatic no flow point apparatus and initiating the program, the test specimen
is heated, if necessary, to a starting temperature and then cooled by prescribed rates. The test specimen is continuously tested for
flow characteristics by continuously monitoring the air pressure variation inside the test specimen vial. When the specimen is still
fluid,
...
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