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ASTM D 4737 Document Information:
Title
Standard Test Method for Calculated Cetane Index by Four Variable Equation
ASTM International
Publication Date:
Dec 1, 2004
Scope:
The calculated Cetane Index by Four Variable Equation provides a means
for estimating the ASTM
cetane number (Test Method D 613) of distillate fuels from density and
distillation recovery
temperature measurements. The value computed from the equation is
termed the Calculated Cetane
Index by Four Variable Equation.
The Calculated Cetane Index by Four Variable Equation is not an
optional method for expressing ASTM
cetane number. It is a supplementary tool for estimating cetane number
when a result by Test Method
D 613 is not available and if cetane improver is not used. As a
supplementary tool, the Calculated
Cetane Index by Four Variable equation must be used with due regard
for its limitations.
Procedure A is to be used for Specification D 975, Grades No. 1-D Low
Sulfur, No. 1-D, No. 2-D, and
No. 4-D. This method for estimating cetane number was developed by
Chevron Research Co.(Footnote 2)
Procedure A is based on a data set including a relatively small number
of No. 1-D fuels. Test
Method D 4737 may be less applicable to No.1-D, No. 1-D Low Sulfur and
No. 4-D grades than to No.
2-D grade.
Procedure B is to be used for Specification D 975, Grade No. 2-D Low
Sulfur.
The test method "Calculated Cetane Index by Four Variable Equation" is
particularly applicable to
Grade 1-D, Grade No. 1-D Low Sulfur and Grade 2-D diesel fuel oils
containing straight-run and
cracked stocks, and their blends. It can also be used for heavier
fuels with 90 % recovery points
less than 382°C and for fuels containing derivatives from oil
sands and oil shale.
The values stated in SI units are to be regarded as the standard. The
values given in parentheses
are for information only.
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.
Footnote 2 - Ingham, M. C., et al., "Improved Predictive Equations for
Cetane Number," SAE Paper No
860250, Society of Automotive Engineers (SAE), 400 Commonwealth Dr.,
Warrendale, PA 15096-0001.
Keywords:
- cetane
- cetane index
- diesel fuel
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