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ASTM D 2885 : 2020

Superseded
Superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

View Superseded by
superseded

A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.

Standard Test Method for Determination of Octane Number of Spark-Ignition Engine Fuels by On-Line Direct Comparison Technique
Available format(s)

Hardcopy , PDF

Superseded date

13-08-2021

Language(s)

English

Published date

13-05-2020

1.1This 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 of a comparison reference fuel.

1.2This 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.

1.3The 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.

1.4The 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 D2699 Research method or Test Method D2700 Motor method operating conditions.

1.4.1Knock measurements are based on operation of both fuels at the fuel-air ratio that produces maximum knock intensity for that fuel.

1.4.2Measured 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.

1.4.3Measured differences in compression ratio are scaled from the appropriate guide table 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.

1.5This test method is limited to testing 78 to 102 octane number spark-ignition engine fuels using either research or motor method conditions.

1.6The 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.

1.7Specifications 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.

1.8The 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.

1.9This 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. For more specific warning statements, see Section 8 and Annex A1.

1.10This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

Committee
D 02
DocumentType
Test Method
Pages
18
PublisherName
American Society for Testing and Materials
Status
Superseded
SupersededBy
Supersedes

ASTM D 2699 : 2019 : EDT 1 Standard Test Method for Research Octane Number of Spark-Ignition Engine Fuel
ASTM D 2700 : 2019 : EDT 1 Standard Test Method for Motor Octane Number of Spark-Ignition Engine Fuel
ASTM D 4814 : 2021 : REV A Standard Specification for Automotive Spark-Ignition Engine Fuel
ASTM D 4858 : 2013 Standard Test Method for Determination of the Tendency of Lubricants to Promote Preignition in Two-Stroke-Cycle Gasoline Engines (Withdrawn 2022)
ASTM D 2699 : 2019 Standard Test Method for Research Octane Number of Spark-Ignition Engine Fuel
ASTM D 4863 : 2013 Standard Test Method for Determination of Lubricity of Two-Stroke-Cycle Gasoline Engine Lubricants (Withdrawn 2022)
ASTM D 2700 : 2019 Standard Test Method for Motor Octane Number of Spark-Ignition Engine Fuel

ASTM E 177 : 1990 : REV A : R1996 Standard Practice for Use of the Terms Precision and Bias in ASTM Test Methods
ASTM E 456 : 2002 Standard Terminology for Relating to Quality and Statistics
ASTM D 6299 : 2021 Standard Practice for Applying Statistical Quality Assurance and Control Charting Techniques to Evaluate Analytical Measurement System Performance
ASTM E 29 : 2002 Standard Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
ASTM D 4175 : 2001 : EDT 1 Standard Terminology Relating to Petroleum, Petroleum Products, and Lubricants
ASTM E 456 : 2013 : REV A : R2017 : EDT 5 Standard Terminology Relating to Quality and Statistics
ASTM D 6300 : 2021 Standard Practice for Determination of Precision and Bias Data for Use in Test Methods for Petroleum Products, Liquid Fuels, and Lubricants
ASTM D 6300 : 2019 : REV A Standard Practice for Determination of Precision and Bias Data for Use in Test Methods for Petroleum Products and Lubricants
ASTM D 4175 : 2002 Standard Terminology Relating to Petroleum, Petroleum Products, and Lubricants
ASTM D 4814 : 2021 Standard Specification for Automotive Spark-Ignition Engine Fuel
ASTM D 6300 : 2020 : REV B Standard Practice for Determination of Precision and Bias Data for Use in Test Methods for Petroleum Products, Liquid Fuels, and Lubricants
ASTM D 6300 : 1999 Standard Practice for Determination of Precision and Bias Data for Use in Test Methods for Petroleum Products and Lubricants
ASTM D 4814 : 2021 : REV A Standard Specification for Automotive Spark-Ignition Engine Fuel
ASTM E 456 : 2013 : REV A : R2017 : EDT 4 Standard Terminology Relating to Quality and Statistics
ASTM D 6299 : 2020 : REV A Standard Practice for Applying Statistical Quality Assurance and Control Charting Techniques to Evaluate Analytical Measurement System Performance

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