Standard Test Method for Calculated Cetane Index by Four Variable Equation

Importancia y uso:

5.1 The Calculated Cetane Index by Four Variable Equation is useful for estimating ASTM cetane number when a test engine is not available for determining this property directly and when cetane improver is not used. 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.

Note 2: Test Methods D6890 and D7170 may be used to obtain a Derived Cetane Number (DCN) when the quantity of sample is too small for an engine test. These methods do measure the effect of cetane improver.

5.2 Within the range from 32.5 to 56.5 cetane number, the expected error of prediction of Procedure A of the Calculated Cetane Index by Four Variable Equation will be less than ±2 cetane numbers for 65 % of the distillate fuels evaluated. Errors may be greater for fuels whose properties fall outside the recommended range of application.

Subcomité:

D02.E0

Referida por:

D7371-14R22, D6751-24, D0975-24A, D1655-24, D0976-21E01, D1655-24, D7156-24, D0976-21E01, D6751-24, D1655-24, D0975-24A, D0976-21E01, D7467-23, D7467-23, D7371-14R22, D0975-24A, D6751-24, D5967-21, D5966-22, D6750-23, D7583-16R23, D7468-22

Volúmen:

05.02

Número ICS:

75.160.20 (Liquid fuels)

Palabras clave:

cetane; cetane index; diesel fuel;