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Standard Test Method for Research Octane Number of Spark-Ignition Engine Fuel
Přeložit název
NORMA vydána dne 1.6.2019
Označení normy: ASTM D2699-19
Poznámka: NEPLATNÁ
Datum vydání normy: 1.6.2019
Kód zboží: NS-953371
Počet stran: 47
Přibližná hmotnost: 141 g (0.31 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
Keywords:
guide table, isooctane, knock intensity, n-heptane, research octane number, spark-ignition engine fuel performance, toluene standardization fuel,, ICS Number Code 75.160.20 (Liquid fuels)
Significance and Use | ||||||||||||||||||||||||||||||||||||
5.1 Research O.N. correlates with commercial automotive spark-ignition engine antiknock performance under mild conditions of operation. 5.2 Research O.N. is used by engine manufacturers, petroleum refiners and marketers, and in commerce as a primary specification measurement related to the matching of fuels and engines. 5.2.1 Empirical correlations that permit
calculation of automotive antiknock performance are based on the
general equation: Values of k1, k2, and k3 vary with vehicles and vehicle populations and are based on road-O.N. determinations. 5.2.2 Research O.N., in conjunction with
Motor O.N., defines the antiknock index of automotive
spark-ignition engine fuels, in accordance with Specification
D4814. The antiknock index of
a fuel approximates the Road octane ratings for many vehicles, is
posted on retail dispensing pumps in the U.S., and is referred to
in vehicle manuals. This is more commonly presented as: 5.2.3 Research O.N. is also used either alone or in conjunction with other factors to define the Road O.N. capabilities of spark-ignition engine fuels for vehicles operating in areas of the world other than the United States. 5.3 Research O.N. is used for measuring the antiknock performance of spark-ignition engine fuels that contain oxygenates. 5.4 Research O.N. is important in relation to the specifications for spark-ignition engine fuels used in stationary and other nonautomotive engine applications. |
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1. Scope | ||||||||||||||||||||||||||||||||||||
1.1 This laboratory test method covers the quantitative determination of the knock rating of liquid spark-ignition engine fuel in terms of Research O.N., including fuels that contain up to 25 % v/v of ethanol. However, this test method may not be applicable to fuel and fuel components that are primarily oxygenates.1.2 The O.N. scale covers the range from 0 to 120 octane number but this test method has a working range from 40 to 120 Research O.N. Typical commercial fuels produced for spark-ignition engines rate in the 88 to 101 Research O.N. range. Testing of gasoline blend stocks or other process stream materials can produce ratings at various levels throughout the Research O.N. range. 1.3 The values of operating conditions are stated in SI units and are considered standard. The values in parentheses are the historical inch-pound units. The standardized CFR engine measurements continue to be in inch-pound units only because of the extensive and expensive tooling that has been created for this equipment. 1.4 For purposes of determining conformance with all specified limits in this standard, an observed value or a calculated value shall be rounded “to the nearest unit” in the last right-hand digit used in expressing the specified limit, in accordance with the rounding method of Practice E29. 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.6 This 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. |
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2. Referenced Documents | ||||||||||||||||||||||||||||||||||||
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