1. Scope

DESIG: D4737 03 ^TITLE: Standard Test Method for Calculated Cetane Index by Four Variable Equation ^

1.1 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.

1.2 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.

1.3 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. 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.

1.4 Procedure B is to be used for Specification D 975, Grade No. 2-D Low Sulfur.

1.5 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 382C and for fuels containing derivatives from oil sands and oil shale.

1.6 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.

1.7 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 (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

D86 Test Method for Distillation of Petroleum Products at Atmospheric Pressure

D613 Test Method for Cetane Number of Diesel Fuel Oil

D975 Specification for Diesel Fuel Oils

D1298 Test Method for Density, Relative Density (Specific Gravity), or API Gravity of Crude Petroleum and Liquid Petroleum Products by Hydrometer Method

D2887 Test Method for Boiling Range Distribution of Petroleum Fractions by Gas Chromatography

D4052 Test Method for Density, Relative Density, and API Gravity of Liquids by Digital Density Meter

D6751 Specification for Biodiesel Fuel Blend Stock (B100) for Middle Distillate Fuels

D6890 Test Method for Determination of Ignition Delay and Derived Cetane Number (DCN) of Diesel Fuel Oils by Combustion in a Constant Volume Chamber

D7170 Test Method for Determination of Derived Cetane Number (DCN) of Diesel Fuel Oils--Fixed Range Injection Period, Constant Volume Combustion Chamber Method

CEN Standards

Keywords

cetane; cetane index; diesel fuel; Calculated Cetane Index (CCI); Density--petroleum products; Distillate fuels; Distillation--petroleum products; Four variable equation; Fuel oils; Nonpetroleum derivatives (of fuel); Shale; Tar sands;

ICS Code

ICS Number Code 75.160.20 (Liquid fuels)

DOI: 10.1520/D4737-03

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