ASTM D6743-11
(Test Method)Standard Test Method for Thermal Stability of Organic Heat Transfer Fluids
Standard Test Method for Thermal Stability of Organic Heat Transfer Fluids
SIGNIFICANCE AND USE
Heat transfer fluids degrade when exposed to sufficiently high temperatures. The amount of degradation increases as the temperature increases or the length of exposure increases, or both. Due to reactions and rearrangement, degradation products can be formed. Degradation products include high and low boiling components, gaseous decomposition products, and products that cannot be evaporated. The type and content of degradation products produced will change the performance characteristics of a heat transfer fluid. In order to evaluate thermal stability, it is necessary to quantitatively determine the mass percentages of high and low boiling components, as well as gaseous decomposition products and those that cannot be vaporized, in the thermally stressed heat transfer fluid.
This test method differentiates the relative stability of organic heat transfer fluids at elevated temperatures in the absence of oxygen and water under the conditions of the test.
The user shall determine to his own satisfaction whether the results of this test method correlate to field performance. Heat transfer fluids in industrial plants are exposed to a variety of additional influencing variables. Interaction with the plant's materials, impurities, heat build-up during impaired flow conditions, the temperature distribution in the heat transfer fluid circuit, and other factors can also lead to changes in the heat transfer fluid. The test method provides an indication of the relative thermal stability of a heat transfer fluid, and can be considered as one factor in the decision-making process for selection of a fluid.
The accuracy of the results depends very strongly on how closely the test conditions are followed.
This test method does not possess the capability to quantify or otherwise assess the formation and nature of thermal decomposition products within the unstressed fluid boiling range. Decomposition products within the unstressed fluid boiling range may represent a significant ...
SCOPE
1.1 This test method covers the determination of the thermal stability of unused organic heat transfer fluids. The procedure is applicable to fluids used for the transfer of heat at temperatures both above and below their boiling point (refers to normal boiling point throughout the text unless otherwise stated). It is applicable to fluids with maximum bulk operating temperature between 260°C (500°F) and 454°C (850°F). The procedure shall not be used to test a fluid above its critical temperature. In this test method, the volatile decomposition products are in continuous contact with the fluid during the test. This test method will not measure the thermal stability threshold (the temperature at which volatile oil fragments begin to form), but instead will indicate bulk fragmentation occurring for a specified temperature and testing period. Because potential decomposition and generation of high pressure gas may occur at temperatures above 260°C (500°F), do not use this test method for aqueous fluids or other fluids which generate high-pressure gas at these temperatures.
1.2 DIN Norm 51528 covers a test method that is similar to this test method.
1.3 The applicability of this test method to siloxane-based heat transfer fluids has not been determined.
1.4 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only.
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. For specific warning statements, see 7.2, 8.8, 8.9, and 8.10.
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Designation: D6743 − 11
StandardTest Method for
1
Thermal Stability of Organic Heat Transfer Fluids
This standard is issued under the fixed designation D6743; 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* 2. Referenced Documents
2
1.1 Thistestmethodcoversthedeterminationofthethermal 2.1 ASTM Standards:
stability of unused organic heat transfer fluids. The procedure D2887 Test Method for Boiling Range Distribution of Pe-
is applicable to fluids used for the transfer of heat at tempera- troleum Fractions by Gas Chromatography
turesbothaboveandbelowtheirboilingpoint(referstonormal D4175 Terminology Relating to Petroleum, Petroleum
boiling point throughout the text unless otherwise stated). It is Products, and Lubricants
applicable to fluids with maximum bulk operating temperature E691 Practice for Conducting an Interlaboratory Study to
between 260°C (500°F) and 454°C (850°F). The procedure Determine the Precision of a Test Method
3
shall not be used to test a fluid above its critical temperature. In 2.2 DIN Norms:
this test method, the volatile decomposition products are in 51528 Determination of the Thermal Stability of Unused
continuous contact with the fluid during the test. This test Heat Transfer Fluids
method will not measure the thermal stability threshold (the
3. Terminology
temperature at which volatile oil fragments begin to form), but
3.1 Definitions:
instead will indicate bulk fragmentation occurring for a speci-
3.1.1 thermal stability, n—the resistance to permanent
fied temperature and testing period. Because potential decom-
changes in properties caused solely by heat. D4175
position and generation of high pressure gas may occur at
temperatures above 260°C (500°F), do not use this test method
3.2 Definitions of Terms Specific to This Standard:
for aqueous fluids or other fluids which generate high-pressure
3.2.1 decomposition products that cannot be vaporized,
gas at these temperatures.
n—materials from the thermally stressed heat transfer fluid,
from which those fractions that can be vaporized are removed
1.2 DIN Norm 51528 covers a test method that is similar to
by distillation procedures, that are quantitatively determined as
this test method.
residues in a bulb tube distillation apparatus.
1.3 The applicability of this test method to siloxane-based
3.2.2 fluid within the unstressed fluid boiling range, n—any
heat transfer fluids has not been determined.
fluid components with boiling point between the initial boiling
1.4 The values stated in SI units are to be regarded as
point and final boiling point of the unstressed fluid.
standard. The values given in parentheses are for information
3.2.3 gaseous decomposition products, n—materials with
only.
boiling points below room temperature, at normal pressure,
1.5 This standard does not purport to address all of the
such as hydrogen and methane, that escape upon opening the
safety concerns, if any, associated with its use. It is the
test cell and that can be determined by measuring the mass
responsibility of the user of this standard to establish appro-
immediately thereafter.
priate safety and health practices and determine the applica-
3.2.4 high boiling components, n—materials from the ther-
bility of regulatory limitations prior to use. For specific
mally stressed heat transfer fluid, with boiling points above the
warning statements, see 7.2, 8.8, 8.9, and 8.10.
final boiling point of the unstressed heat transfer fluid, but
1 2
This test method is under the jurisdiction of ASTM Committee D02 on For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
D02.L0.06 on Non-Lubricating Process Fluids. Standards volume information, refer to the standard’s Document Summary page on
Current edition approved Dec. 1, 2011. Published February 2012. Originally the ASTM website.
3
approvedin2001.Lastpreviouseditionapprovedin2011asD6743–06(2011).DOI: AvailablefromDeutschesInstitutfurNormunge.V.(DIN),Burggrafenstrasse6,
10.1520/D6743-11. 10787 Berlin, Germany, http://www.din.de.
*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
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D6743 − 11
which can still be separated by distillation from the heat 5.4 The accuracy of the results depends very strongly on
transfer fluid by means of classical separation proced
...
This document is not an ASTM standard and is intended only to provide the user of an ASTM 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:D6743–06 (Reapproved 2011) Designation:D6743–11
Standard Test Method for
1
Thermal Stability of Organic Heat Transfer Fluids
This standard is issued under the fixed designation D6743; 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*
1.1 This test method covers the determination of the thermal stability of unused organic heat transfer fluids. The procedure is
applicable to fluids used for the transfer of heat at temperatures both above and below their boiling point (refers to normal boiling
point throughout the text unless otherwise stated). It is applicable to fluids with maximum bulk operating temperature between
260°C(500°F)and454°C(850°F).Theprocedureshallnotbeusedtotestafluidaboveitscriticaltemperature.Inthistestmethod,
the volatile decomposition products are in continuous contact with the fluid during the test. This test method will not measure the
thermal stability threshold (the temperature at which volatile oil fragments begin to form), but instead will indicate bulk
fragmentation occurring for a specified temperature and testing period. Because potential decomposition and generation of high
pressure gas may occur at temperatures above 260°C (500°F), do not use this test method for aqueous fluids or other fluids which
generate high-pressure gas at these temperatures.
1.2 DIN Norm 51528 covers a test method that is similar to this test method.
1.3 The applicability of this test method to siloxane-based heat transfer fluids has not been determined.
1.4 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only.
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. For specific warning statements, see 7.2, 8.8, 8.9, and 8.10.
2. Referenced Documents
2
2.1 ASTM Standards:
D2887 Test Method for Boiling Range Distribution of Petroleum Fractions by Gas Chromatography
D4175 Terminology Relating to Petroleum, Petroleum Products, and LubricantsTerminology Relating to Petroleum, Petroleum
Products, and Lubricants
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
3
2.2 DIN Norms:
51528 Determination of the Thermal Stability of Unused Heat Transfer Fluids
3. Terminology
3.1 Definitions:
3.1.1 thermal stability, n—the resistance to permanent changes in properties caused solely by heat. D4175
3.2 Definitions of Terms Specific to This Standard:
3.2.1 decomposition products that cannot be vaporized, n—materialsfromthethermallystressedheattransferfluid,fromwhich
thosefractionsthatcanbevaporizedareremovedbydistillationprocedures,thatarequantitativelydeterminedasresiduesinabulb
tube distillation apparatus.
3.2.2 fluid within the unstressed fluid boiling range, n—anyfluidcomponentswithboilingpointbetweentheinitialboilingpoint
and final boiling point of the unstressed fluid.
3.2.3 gaseous decomposition products, n—materials with boiling points below room temperature, at normal pressure, such as
hydrogen and methane, that escape upon opening the test cell and that can be determined by measuring the mass immediately
thereafter.
3.2.4 high boiling components, n—materials from the thermally stressed heat transfer fluid, with boiling points above the final
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.L0.06
on Non-Lubricating Process Fluids.
Current edition approved MayDec. 1, 2011. Published August 2011.February 2012. Originally approved in 2001. Last previous edition approved in 20062011 as
D6743–06(2011). DOI: 10.1520/D6743-06R11.10.1520/D6743-11.
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.
3
Available from Deutsches Institut fur Normung e.V.(DIN), Burggrafenstrasse 6, 10787 Berlin, Germany, http://www.din.de.
*A Summary of Changes section appears at the end of this standard.
Copyright © ASTM Internatio
...
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