This document specifies a test method for the determination of the oxidation stability at 120 °C of fuels for diesel engines, by means of measuring the induction period of the fuel. Two different areas of application with separate precision statements are covered. For diesel fuel having a FAME content in the range between 2 % (V/V) and 50 % (V/V), an induction period of up to 20 hours can be determined. For neat FAME, the maximum induction period is limited to 12 hours. The precision of the test method has been developed for conventional diesel.
This test method is applicable for FAME blends with paraffinic diesel fuels as specified in EN 15940, however, a separate precision statement is not available.
Note 1 An almost identical test method for oxidation stability at 110 °C is described in EN 15751, which applies to neat FAME and diesel/FAME blends containing 2 % (V/V) of FAME at minimum. Other alternative test methods for the determination of the oxidation stability of distillate fuels are described in CEN/TC 17225.
Note 2 The precision of this method was determined using samples of diesel fuel blends with FAME displaying a maximum induction period of approximately 20 h, or respectively, of neat FAME with a maximum induction period of 12 hours. Higher induction periods are not covered by the precision statement; however, experience from EN 15751 indicates sufficient precision up to 48 h.
Note 3 The presence of cetane improver can reduce the oxidation stability determined by this test method. Limited studies with 2-ethyl hexyl nitrate (EHN) indicated that the stability is reduced to an extent which is within the reproducibility of the test method.
Note 4 For the purposes of this document, the term “% (V/V)” is used to represent the volume fraction.
Registration number (WIID)
83463
Scope
This document specifies a test method for the determination of the oxidation stability at 120 °C of fuels for diesel engines, by means of measuring the induction period of the fuel. Two different areas of application with separate precision statements are covered. For diesel fuel having a FAME content in the range between 2 % (V/V) and 50 % (V/V), an induction period of up to 20 hours can be determined. For neat FAME, the maximum induction period is limited to 12 hours. The precision of the test method has been developed for conventional diesel.
This test method is applicable for FAME blends with paraffinic diesel fuels as specified in EN 15940, however, a separate precision statement is not available.
Note 1 An almost identical test method for oxidation stability at 110 °C is described in EN 15751, which applies to neat FAME and diesel/FAME blends containing 2 % (V/V) of FAME at minimum. Other alternative test methods for the determination of the oxidation stability of distillate fuels are described in CEN/TC 17225.
Note 2 The precision of this method was determined using samples of diesel fuel blends with FAME displaying a maximum induction period of approximately 20 h, or respectively, of neat FAME with a maximum induction period of 12 hours. Higher induction periods are not covered by the precision statement; however, experience from EN 15751 indicates sufficient precision up to 48 h.
Note 3 The presence of cetane improver can reduce the oxidation stability determined by this test method. Limited studies with 2-ethyl hexyl nitrate (EHN) indicated that the stability is reduced to an extent which is within the reproducibility of the test method.
Note 4 For the purposes of this document, the term “% (V/V)” is used to represent the volume fraction.
