ISO 4264:2018 pdf free

ISO 4264:2018 pdf free.Petroleum products一Calculation of cetane index of middle-distillate fuels by the four variable equation
This document specifies a procedure for the calculation of the cetane index of middle-distillate fuels from petroleum-derived sources. The calculated value is termed the “cetane index by four-variable equation”. Throughout the remaining text of this document, the term“cetane index” implies cetane index by four-variable equation.
This document is applicable to fuels containing non-petroleum derivatives from tar sand and oil shale. It is not applicable to pure hydrocarbons, nor to distillate fuels derived from coal. Cetane index calculations do not take into account the effects from additives used to enhance the Cetane number.
NOTE 1 This document was originally developed using a matrix of fuels, some of which contain non-petroleum derivatives from tar sands and oil shale.
NOTE 2 The cetane index is not an alternative way to express the cetane number; it is a supplementary tool, to be used 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 to determine this property directly, or when insufficient sample is available for an engine rating.
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 91, Petroleum and related products一Temperature and pressure volume correction factors (petroleum measurement tables) and standard reference
ISO 3405, Petroleum products一Determination of distillation characteristics at atmospheric pressure
ISO 3675, Crude petroleum and liquid petroleum products一Laboratory determination of density一Hydrometer method
ISO 3924, Petroleum products一Determination of boiling range distribution一Gas chromatography method
ISO 12185, Crude petroleum and petroleum products一Determination of density一Oscillating U-tube method
The precision of the cetane index equation is dependent on the precision of the original density and distillation recovery temperature determinations which enter into the calculation. The precision of these determinations is stated in ISO 3675, ISO 12185 and ISO 3405.ISO 4264 pdf download.