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ASTM D2885

Standard Test Method for Determination of Octane Number of Spark-Ignition Engine Fuels by On-Line Direct Comparison Technique

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Organization: ASTM
Publication Date: 10 May 2003
Status: inactive
Page Count: 16
ICS Code (Liquid fuels): 75.160.20
scope:

This test method covers the quantitative on-line determination by direct comparison of the difference in knock rating or delta octane number of a stream sample of spark-ignition engine fuel from that of a comparison reference fuel.

This test method covers the methodology for obtaining an octane number using the measured delta octane number and the octane number of the comparison reference fuel.

The comparison reference fuel is required to be of essentially the same composition as the stream sample to be analyzed and can be a secondary fuel termed standard fuel or a tertiary fuel termed prototype fuel.

The test method utilizes a knock testing unit/automated analyzer system that incorporates computer control of a standardized single-cylinder, four-stroke cycle, variable compression ratio, carbureted, CFR engine with appropriate auxiliary equipment using either Test Method D 2699 Research method or Test Method D 2700 Motor method operating conditions.

Knock measurements are based on operation of both fuels at the specific fuel-air ratio that produces maximum knock intensity for that fuel.

Measured differences in knock intensity are scaled to provide a positive or negative delta octane number of the stream sample from the comparison reference fuel when the fuels are compared at the same compression ratio.

Measured differences in compression ratio are scaled to provide a positive or negative delta octane number of the stream sample from the comparison reference fuel when the fuels are compared at the same knock intensity.

This test method is limited to testing 78 to 102 octane number spark-ignition engine fuels using either research or motor method conditions.

The octane number difference between the stream sample and the applicable comparison reference fuel is self-limiting by specifications imposed upon the standard and prototype fuels.

Specifications for selection, preparation, storage, and dispensing of standard and prototype fuels are provided. Detailed procedures for determination of an appropriate assigned octane number for both standard and prototype fuels are also incorporated.

The values of operating conditions are stated in SI units and are considered standard. The values in parentheses are historical inch-pound units. The standardized CFR engine measurements continue to be expressed in inch-pound units only because of the extensive and expensive tooling that has been created for this equipment.

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. For more specific hazard statements, see Section 8 and Annex A1.

Document History

May 1, 2020
Standard Test Method for Determination of Octane Number of Spark-Ignition Engine Fuels by On-Line Direct Comparison Technique
This test method covers the quantitative online determination by direct comparison of the difference in knock rating or delta octane number of a stream sample of spark-ignition engine fuel from that...
November 1, 2019
Standard Test Method for Determination of Octane Number of Spark-Ignition Engine Fuels by On-Line Direct Comparison Technique
This test method covers the quantitative online determination by direct comparison of the difference in knock rating or delta octane number of a stream sample of spark-ignition engine fuel from that...
June 1, 2019
Standard Test Method for Determination of Octane Number of Spark-Ignition Engine Fuels by On-Line Direct Comparison Technique
This test method covers the quantitative online determination by direct comparison of the difference in knock rating or delta octane number of a stream sample of spark-ignition engine fuel from that...
May 1, 2019
Standard Test Method for Determination of Octane Number of Spark-Ignition Engine Fuels by On-Line Direct Comparison Technique
This test method covers the quantitative online determination by direct comparison of the difference in knock rating or delta octane number of a stream sample of spark-ignition engine fuel from that...
June 15, 2013
Standard Test Method for Determination of Octane Number of Spark-Ignition Engine Fuels by On-Line Direct Comparison Technique
This test method covers the quantitative online determination by direct comparison of the difference in knock rating or delta octane number of a stream sample of spark-ignition engine fuel from that...
October 1, 2010
Standard Test Method for Determination of Octane Number of Spark-Ignition Engine Fuels by On-Line Direct Comparison Technique
This test method covers the quantitative online determination by direct comparison of the difference in knock rating or delta octane number of a stream sample of spark-ignition engine fuel from that...
February 15, 2010
Standard Test Method for Determination of Octane Number of Spark-Ignition Engine Fuels by On-Line Direct Comparison Technique
This test method covers the quantitative online determination by direct comparison of the difference in knock rating or delta octane number of a stream sample of spark-ignition engine fuel from that...
October 1, 2009
Standard Test Method for Determination of Octane Number of Spark-Ignition Engine Fuels by On-Line Direct Comparison Technique
This test method covers the quantitative online determination by direct comparison of the difference in knock rating or delta octane number of a stream sample of spark-ignition engine fuel from that...
July 1, 2008
Standard Test Method for Determination of Octane Number of Spark-Ignition Engine Fuels by On-Line Direct Comparison Technique
This test method covers the quantitative online determination by direct comparison of the difference in knock rating or delta octane number of a stream sample of spark-ignition engine fuel from that...
ASTM D2885
May 10, 2003
Standard Test Method for Determination of Octane Number of Spark-Ignition Engine Fuels by On-Line Direct Comparison Technique
This test method covers the quantitative on-line determination by direct comparison of the difference in knock rating or delta octane number of a stream sample of spark-ignition engine fuel from that...
January 15, 1995
Standard Test Method for Research and Motor Method Octane Ratings Using On-Line Analyzers
1. Scope 1.1 This test method covers the calibration and use of automatic analyzers for determining the antiknock quality of motor gasolines. Octane numbers from analyzers operated in accordance with...
January 1, 1993
Standard Test Method for Research and Motor Method Octane Ratings Using on-Line Analyzers (Annexes Included) (IP 360/94)
A description is not available for this item.
September 15, 1992
STANDARD TEST METHOD FOR RESEARCH AND MOTOR METHOD OCTANE RATINGS USING ON-LINE ANALYZERS (ANNEXES INCLUDED) (IP 360/84)
A description is not available for this item.
February 20, 1990
STANDARD TEST METHOD FOR RESEARCH AND MOTOR METHOD OCTANE RATINGS USING ON-LINE ANALYZERS (ANNEXES INCLUDED) (IP 360/84)
A description is not available for this item.
October 31, 1986
STANDARD TEST METHOD FOR RESEARCH AND MOTOR METHOD OCTANE RATINGS USING ON-LINE ANALYZERS (ANNEXES INCLUDED)
A description is not available for this item.
January 1, 1984
STANDARD TEST METHOD FOR RESEARCH AND MOTOR METHOD OCTANE RATINGS USING ON-LINE ANALYZERS (ANNEXES INCLUDED)
A description is not available for this item.

References

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