ASTM-D7668 2010

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D7668-10 Standard Test Method for Determination of Derived Cetane Number (DCN) of Diesel Fuel Oils – Ignition Delay and Combustion Delay Using a Constant Volume Combustion Chamber Method

Published By	Publication Date	Number of Pages
ASTM	2010	11

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Categories: 75.160.20 - Liquid fuels, ASTM

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Description

1.1 This test method covers the quantitative determination of the derived cetane number of conventional diesel fuel oils, diesel fuel oils containing cetane number improver additives, and is applicable to products typical of Specification D975 , Grades No.1-D and 2-D regular, low and ultra-low-sulfur diesel fuel oils, European standard EN590, and Canadian standards CAN/CGSB-3.517 and CAN/CGSB3.6. The test method may be applied to the quantitative determination of the derived cetane number of blends of fuel oils containing biodiesel material (for example, Specification D975 , biodiesel, and diesel fuel oil blending components.

1.2 This test method utilizes a constant volume combustion chamber with direct fuel injection into heated, compressed synthetic air. A dynamic pressure wave is produced from the combustion of the sample. An equation converts the ignition delay and the combustion delay determined from the dynamic pressure curve to a derived cetane number (DCN).

1.3 This test method covers the ignition delay ranging from 2.8 to 6.5 ms and combustion delay ranging from 5.5 to 120 ms (30.0 to 65.0 DCN). However, the precision stated only covers the range of DCN from 35 to 60.

1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

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.

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PDF Pages	PDF Title
1	Scope Referenced Documents
2	Terminology Summary of Test Method
3	Significance and Use Interferences Apparatus
4	Reagents and Materials Sampling and Test Specimen Preparation Basic Apparatus Settings and Standard Operating Conditions
5	Calibration and Quality Control Testing
6	Procedure Calculation Report
7	Precision and Bias Keywords A1. HAZARDS INFORMATION A1.1 A1.2 A1.3 A1.4 A1.5 A1.6 TABLE 1
8	A2. PRECALIBRATION SAMPLE SYSTEM CLEANING PROCEDURE A2.1 A3. CALCULATION OF ID AND CD A3.1 FIG. A3.1
9	A4. INSTRUMENT SCHEMATIC A4.1 A4.2 Combustion Chamber A4.3 Fuel Injection System A4.4 A4.5 Coolant System A4.6 Charge Air Circuit
10	A5. AUTOMATIC CALIBRATION PROCEDURE A5.1 A5.2 A5.3 A5.4 A5.5 A5.6 A5.7 A5.8 A5.9 A5.10 FIG. A4.1
11	A5.11 A5.12 A5.13 A5.14 A5.15 A6. COMMON RAIL INJECTOR CHARACTERIZATION A6.1 A6.2 A6.3 A6.4 TABLE A6.1

Additional information

Standard Title	D7668-10 Standard Test Method for Determination of Derived Cetane Number (DCN) of Diesel Fuel Oils – Ignition Delay and Combustion Delay Using a Constant Volume Combustion Chamber Method
Published Code	ASTM
Publication Date	2010
Pages Count	11
ICS Codes	75.160.20 - Liquid fuels

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ASTM-D7668 2010

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