ASTM D976-04
(Test Method)Standard Test Methods for Calculated Cetane Index of Distillate Fuels
Standard Test Methods for Calculated Cetane Index of Distillate Fuels
SCOPE
1.1 These test methods cover the Calculated Cetane Index formula, which represents a means for directly estimating the ASTM cetane number of distillate fuels from API gravity and mid-boiling point. The index value, as computed from the formula, is termed the Calculated Cetane Index.
1.2 The Calculated Cetane Index is not an optional method for expressing ASTM cetane number. It is a supplementary tool for predicting cetane number when used with due regard for its limitations.
1.3 The Calculated Cetane Index formula is particularly applicable to straight-run fuels, catalytically cracked stocks, and blends of the two.
Note 1—These test methods are temporarily retained because the proposal to the U.S. EPA to control diesel fuel aromatics concentrations via a 40 Calculated Cetane Index minimum is based on the correlation between Test Method D 976 and aromatics concentration. Test Method D 4737 is the preferred method as estimator of cetane number.
1.4 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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Standards Content (Sample)
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An American National Standard
Designation: D 976 – 04
Designation: 364/84
Standard Test Methods for
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Calculated Cetane Index of Distillate Fuels
This standard is issued under the fixed designation D 976; 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.
1. Scope 2. Referenced Documents
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1.1 These test methods cover the Calculated Cetane Index 2.1 ASTM Standards:
formula, which represents a means for directly estimating the D 86 Test Method for Distillation of Petroleum Products at
ASTM cetane number of distillate fuels from API gravity and Atmospheric Pressure
mid-boiling point. The index value, as computed from the D 287 Test Method for API Gravity of Crude Petroleum and
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formula, is termed the Calculated Cetane Index. Petroleum Products (Hydrometer Method)
1.2 The Calculated Cetane Index is not an optional method D 613 Test Method for Cetane Number of Diesel Fuel Oil
for expressing ASTM cetane number. It is a supplementary tool D 1298 Test Method for Density, Relative Density (Specific
for predicting cetane number when used with due regard for its Gravity), or API Gravity of Crude Petroleum and Liquid
limitations. Petroleum Products by Hydrometer Method
1.3 The Calculated Cetane Index formula is particularly D 4052 Test Method for Density and Relative Density of
applicable to straight-run fuels, catalytically cracked stocks, Liquids by Digital Density Meter
and blends of the two. D 4737 Test Method for Calculated Cetane Index by Four
Variable Equation
NOTE 1—These test methods are temporarily retained because the
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2.2 ASTM Adjuncts:
proposal to the U.S. EPA to control diesel fuel aromatics concentrations
ADJ0976 Nomograph for Calculated Cetane Index
via a 40 Calculated Cetane Index minimum is based on the correlation
between Test Method D 976 and aromatics concentration. Test Method
3. Significance and Use
D 4737 is the preferred method as estimator of cetane number.
3.1 The Calculated Cetane Index is a useful tool for esti-
1.4 This standard does not purport to address all of the
mating ASTM cetane number where a test engine is not
safety concerns, if any, associated with its use. It is the
available for determining this property. It may be conveniently
responsibility of the user of this standard to establish appro-
employed for approximating cetane number where the quantity
priate safety and health practices and determine the applica-
of sample is too small for an engine rating. In cases where the
bility of regulatory limitations prior to use.
cetane number of a fuel has been initially established, the index
is useful as a cetane number check on subsequent samples of
that fuel, provided its source and mode of manufacture remain
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These test methods are under the jurisdiction of ASTM Committee D02 on
unchanged.
Petroleum Products and Lubricants and are the direct responsibility of Subcommit-
tee D02.E0 on Burner, Diesel, Non-Aviation Gas Turbine, and Marine Fuels.
This is also a standard of the Institute of Petroleum issued under the fixed
4. Equation for Calculated Cetane Index
designation IP 218. The final number indicates the year of last revision.
4.1 The Calculated Cetane Index is determined from the
These test methods have been approved by the sponsoring committees and
accepted by the cooperating societies in accordance with established procedures. following equation:
Current edition approved June 1, 2004. Published July 2004. Originally approved
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in 1966. Last previous edition approved in 2000 as D 976–91(2000) .
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A method of calculating cetane index was developed by the Diesel Fuels For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Division, Coordinating Fuel and Equipment Research Committee of the Coordinat- contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
ing Research Council. See Young, H. D., “Methods for Estimating Cetane Number,” Standards volume information, refer to the standard’s Document Summary page on
Proceedings, PPIRA, American Petroleum Institute, Vol. 30 M [III], 1950. This the ASTM website.
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method was revised in 1960 by Research Division I of Committee D02 to conform Available from ASTM International Headquarters. Order Adjunct No.
to the revised Test Method D 613. ADJD0976.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D976–04
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inherent limitations which must be recognized in its applica-
Calculated cetane i
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