IP 617: Determination of generic cetane number (G-CN) of fuels using a constant volume combustion chamber — primary reference fuels calibration (PRFC) method

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  • Method adopted/last revised: 2018
  • Method reapproved: None
  • REF/ISBN: IP617-2938621
  • Status: Current
  • First printed in STM books: April 2018


This standard specifies a method for the quantitative determination of the indicated cetane number (ICN) of middle distillate fuels and blending components, intended for use in compression ignition engines. The method is applicable to middle distillate fuels of both petroleum and non-petroleum origin, hydrocarbon oils, oil-sands based fuels, blending components, fatty acid methyl esters (FAME), blends of fuel containing biodiesel material, diesel fuel oils containing cetane number improver additives and low-sulfur diesel fuel oils, over the calibrated range of 35 ICN to 85 ICN. However, users applying this standard especially to unconventional distillate fuels are warned that the relationship between cetane number and combustion behaviour in real engines is not yet fully understood.

NOTE 1 The analyser can measure ICN outside the calibrated range, but precision has not been determined.

NOTE 2 For the purpose of this standard, the expression “% (V/V)” is used to represent the volume fraction.

NOTE 3 For the purpose of this standard, the abbreviation ICN (Indicated Cetane Number) is being used to discriminate it from other techniques.

This test method uses blends of primary reference materials for calibration.

WARNING — The use of this Standard can involve hazardous materials, operations and equipment. This Standard does not purport to address all of the safety problems associated with its use. It is the responsibility of users of this standard to take appropriate measures to ensure the safety and health of personnel prior to application of the standard, and fulfil statutory and regulatory requirements for this purpose.

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