ASTM D3241-05a
(Test Method)Standard Test Method for Thermal Oxidation Stability of Aviation Turbine Fuels (JFTOT Procedure)
Standard Test Method for Thermal Oxidation Stability of Aviation Turbine Fuels (JFTOT Procedure)
SCOPE
1.1 This test method covers the procedure for rating the tendencies of gas turbine fuels to deposit decomposition products within the fuel system.
1.2 The values stated in SI units are to be regarded as the standard. The inch-pound values given in parentheses are for information only. The differential pressure values in mm Hg are defined only in terms of this test method.
1.3 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 6.1.1, 7.2, 7.2.1, 7.3, 11.1.1, and Annex A3.
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An American National Standard
Designation:D3241–05a
Designation 323/99
Standard Test Method for
Thermal Oxidation Stability of Aviation Turbine Fuels
1
(JFTOT Procedure)
This standard is issued under the fixed designation D 3241; 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.
This standard has been approved for use by agencies of the Department of Defense.
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1. Scope* 2.2 ASTM Adjuncts:
Color Standard for Tube Deposit Rating
1.1 This test method covers the procedure for rating the
tendencies of gas turbine fuels to deposit decomposition
3. Terminology
products within the fuel system.
3.1 Definitions of Terms Specific to This Standard:
1.2 The values stated in SI units are to be regarded as the
3.1.1 deposits—oxidative products laid down on the test
standard. The inch-pound values given in parentheses are for
area of the heater tube or caught in the test filter, or both.
information only. The differential pressure values in mm Hg
3.1.1.1 Discussion—Fuel deposits will tend to predominate
are defined only in terms of this test method.
at the hottest portion of the heater tube, which is between the
1.3 This standard does not purport to address all of the
30-mm and 50-mm position.
safety concerns, if any, associated with its use. It is the
3.1.2 heater tube—an aluminum coupon controlled at el-
responsibility of the user of this standard to establish appro-
evated temperature, over which the test fuel is pumped.
priate safety and health practices and determine the applica-
3.1.2.1 Discussion—The tube is resistively heated and con-
bility of regulatory limitations prior to use. For specific
trolled in temperature by a thermocouple positioned inside.
warning statements, see 6.1.1, 7.2, 7.2.1, 7.3, 11.1.1, and
The critical test area is the thinner portion, 60 mm in length,
Annex A3.
betweentheshouldersofthetube.Fuelinlettothetubeisatthe
2. Referenced Documents 0-mm position, and fuel exit is at 60 mm.
2 3.2 Abbreviations:
2.1 ASTM Standards:
3.2.1 D P—differential pressure.
D 1655 Specification for Aviation Turbine Fuels
D 4306 Practice for Aviation Fuel Sample Containers for
4. Summary of Test Method
Tests Affected by Trace Contamination
4.1 This test method for measuring the high temperature
E 177 Practice for Use of the Terms Precision and Bias in
stability of gas turbine fuels uses the Jet Fuel Thermal
ASTM Test Methods
Oxidation Tester (JFTOT) that subjects the test fuel to condi-
E 691 Practice for Conducting an Interlaboratory Study to
tions that can be related to those occurring in gas turbine
Determine the Precision of a Test Method
engine fuel systems. The fuel is pumped at a fixed volumetric
flow rate through a heater, after which it enters a precision
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stainless steel filter where fuel degradation products may
This test method is under the jurisdiction of ASTM Committee D02 on
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee
become trapped.
D02.J0 on Aviation Fuels.
4.1.1 The apparatus uses 450 mL of test fuel ideally during
CurrenteditionapprovedJune1,2005.PublishedJuly2005.Originallyapproved
a 2.5-h test. The essential data derived are the amount of
in 1973. Last previous edition approved in 2005 as D 3241–05.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
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Standards volume information, refer to the standard’s Document Summary page on Available from ASTM International Headquarters. Order Adjunct No.
the ASTM website. ADJD3241.
*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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D3241–05a
TABLE 1 Models of JFTOT
those surfaces (before the test section) that contact fresh
JFTOT User Pressurize Pump sample. (Warning—Extremely flammable. Harmful if inhaled
Differential Pressure By
Model Manual With Principle
(see Annex A3).)
A
202 202/203 nitrogen gear Hg Manometer; No Record
7.2.1 Use trisolvent (equal mix of acetone (1), toluene (2),
A
203 202/203 nitrogen gear Manometer + Graphical
and isopropanol (3)) as a specific solvent to clean internal
Record
B
(working) surface of test section only. (Warning—(1) Ex-
215 215 nitrogen gear Transducer + Printed
Record
tremely flammable, vapors may cause flash fire; (2) and (3)
C
230 230/240 hydraulic syringe Transducer + Printout
Flammable.Vaporsofallthreeharmful.Irritatingtoskin,eyes,
C
240 230/240 hydraulic syringe Transducer + Printout
and muc
...
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