標準號：ISO 4264-2007
中文標準名稱：石油產品.四變量公式法計算中間餾分燃料的十六烷指數
英文標準名稱：Petroleum products - Calculation of cetane index of middle-distillate fuels by the four-variable equation
標準類型：E30
發布日期：1999/12/31 12:00:00
實施日期：1999/12/31 12:00:00
中國標準分類號：E30
國際標準分類號：75.160.20
適用范圍：This International Standard describes a procedure for the calculation of the cetane index of middle-distillatefuels from petroleum-derived sources. The calculated value is termed the “cetane index by four-variableequation”. Throughout the remaining text of this International Standard, the term “cetane index” implies cetaneindex by four-variable equation.This International Standard is not applicable to fuels containing additives for raising the cetane number, nor topure hydrocarbons, nor to distillate fuels derived from coal. It is applicable to fuels containing non-petroleumderivatives from tar sand and oil shale.NOTE 1 This International Standard was originally developed using a matrix of fuels, some of which contain nonpetroleumderivates from tar sands and oil shale. Other cetane index equations have since been developed which can bemore applicable to tar sands products.NOTE 2 The cetane index is not an alternative way to express the cetane number; it is a supplementary tool, to beused with due regard for its limitations.NOTE 3 The cetane index is used to estimate the cetane number of diesel fuel when a test engine is not available todetermine this property directly, or when insufficient sample is available for an engine rating. In cases where the cetanenumber of a fuel has been previously established, the cetane index can be used to verify the cetane number ofsubsequent samples of that fuel, provided the fuel's source and mode of manufacture remain unchanged.The recommended range of fuel properties for application of this International Standard is as follows:Fuel property Recommended rangeCetane number 32,5 – 56,5Density at 15 °C, kg/m3 805,0 – 895,010 % (V/V) distillation recovery temperature, °C 171 – 25950 % (V/V) distillation recovery temperature, °C 212 – 30890 % (V/V) distillation recovery temperature, °C 251 – 363Within the recommended range of cetane number (32,5 to 56,5), the expected error of the prediction via thecetane index equation will be less than ± 2 cetane numbers for 65 % of the distillate fuels examined. Errorsmay be greater for fuels whose properties fall outside the recommended range of application.