ASTM-D6890 2011

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D6890-11 Standard Test Method for Determination of Ignition Delay and Derived Cetane Number (DCN) of Diesel Fuel Oils by Combustion in a Constant Volume Chamber

Published By	Publication Date	Number of Pages
ASTM	2011	16

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Categories: 13.220.40 - Ignitability and burning behaviour of materials and products, 43.060.40 - Fuel systems, ASTM

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Description

1.1 This automated laboratory test method covers the quantitative determination of the ignition characteristics of conventional diesel fuel oil, oil-sands based fuels, blends of fuel containing biodiesel material, diesel fuel oils containing cetane number improver additives, and is applicable to products typical of ASTM Specification D975 grades No. 1-D and 2-D regular and low-sulfur diesel fuel oils, European standard EN 590, and Canadian standards CAN/CGSB-3.517 and 3.6-2000. The test method may also be applied to the quantitative determination of the ignition characteristics of diesel fuel blending components.

1.2 This test method measures the ignition delay and utilizes a constant volume combustion chamber with direct fuel injection into heated, compressed air. An equation correlates an ignition delay determination to cetane number by Test Method D613 , resulting in a derived cetane number (DCN).

1.3 This test method covers the ignition delay range from 3.1 to 6.5 ms (64 to 33 DCN). The combustion analyzer can measure shorter and longer ignition delays, but precision may be affected. For these shorter or longer ignition delays the correlation equation for DCN is given in Appendix X2. There is no information about how DCNs outside the 33 to 64 range compare to Test Method D613 cetane numbers.

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.

PDF Catalog

PDF Pages	PDF Title
1	Scope Referenced Documents
2	Terminology Summary of Test Method Significance and Use Interferences
3	Apparatus Reagents and Materials
4	Sampling and Test Specimen Preparation Basic Apparatus Settings and Standard Operating Conditions FIG. 1
5	Calibration and Quality Control Testing
6	Procedure Calculation
7	Report Precision and Bias Keywords TABLE 1 TABLE 2
8	A1. HAZARDS INFORMATION A1.1 Introduction A1.2 A1.3 A1.4 A1.5 A1.6 A1.7 A2. COMBUSTION ANALYZER EQUIPMENT DESCRIPTION AND SPECIFICATIONS A2.1 A2.2 TABLE 3
9	A2.3 FIG. A2.1
10	A2.4 A2.5 A2.6 Circulating Coolant System FIG. A2.2
11	A2.7 Optional Equipment A3. COMBUSTION ANALYZER OPERATING FUNCTIONS A3.1 Starting and Warm-up Procedure A3.2 Fuel Injection System Procedure
12	A3.3 Pressure Sensor Assembly Cleaning Procedure A3.4 Alternative Pressure Sensor Assembly Cleaning Procedure
13	A3.5 Combustion Chamber Sealing Integrity Check Procedure A3.6 Combustion Analyzer Shut Down Procedure A4. SUPPLEMENTAL PROCEDURE INFORMATION A4.1 Test Sequence
14	A5. DERIVATION AND MAINTENANCE OF DCN EQUATION A5.1 A5.2 A5.3 X1. EXAMPLE OF TEST OUTPUT FIG. A4.1
15	FIG. X1.1
16	X2. CORRELATION EQUATION X2.1

Additional information

Standard Title	D6890-11 Standard Test Method for Determination of Ignition Delay and Derived Cetane Number (DCN) of Diesel Fuel Oils by Combustion in a Constant Volume Chamber
Published Code	ASTM
Publication Date	2011
Pages Count	16
ICS Codes	13.220.40 - Ignitability and burning behaviour of materials and products 43.060.40 - Fuel systems

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