ASTM D4737 PDF

Historical Version s - view previous versions of standard. More D It may be conveniently employed for estimating cetane number when the quantity of sample available is too small for an engine rating. In cases where the ASTM cetane number of a fuel has been previously established, the Calculated Cetane Index by Four Variable Equation is useful as a cetane number check on subsequent batches of that fuel, provided the fuel's source and mode of manufacture remain unchanged. These methods do measure the effect of cetane improver.

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Historical Version s - view previous versions of standard. More D It may be conveniently employed for estimating cetane number when the quantity of sample available is too small for an engine rating. In cases where the ASTM cetane number of a fuel has been previously established, the Calculated Cetane Index by Four Variable Equation is useful as a cetane number check on subsequent batches of that fuel, provided the fuel's source and mode of manufacture remain unchanged.

These methods do measure the effect of cetane improver. Errors may be greater for fuels whose properties fall outside the recommended range of application. It is a supplementary tool for estimating cetane number when a result by Test Method D is not available and if cetane improver is not used. As a supplementary tool, the Calculated Cetane Index by Four Variable equation must be used with due regard for its limitations. This method for estimating cetane number was developed by Chevron Research Co.

No other units of measurement are included in this standard. 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. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

E0 Book of Standards Volume: Scope 1. Link to Active This link will always route to the current Active version of the standard.

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Cetane index is used as a substitute for the cetane number of diesel fuel. The older D, or "two-variable equation" is outdated and should no longer be used for cetane number estimation. It is, however, still required by the United States Environmental Protection Agency EPA as an alternative method for satisfying its aromaticity requirement for diesel fuel. D is the newest method and is sometimes referred to as "the four-variable equation".

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Cetane index

Active view current version of standard. Other Historical Standards. More D E0 Standards Related Products 1. It is a supplementary tool for estimating cetane number when a result by Test Method D is not available and if cetane improver is not used. As a supplementary tool, the Calculated Cetane Index by Four Variable equation must be used with due regard for its limitations.

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