Fuels & Lubricants Magazine
Issue No. 2, June 2018
Issue No. 2, June 2018
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The Validation Of Test Method<br />
ASTM D7668 (EN 16715) for<br />
the Determination of Derived<br />
Cetane Number (DCN)<br />
Manja Moder<br />
Petrol Plc. Slovenia<br />
manja.moder@petrol.si<br />
Vid Čopi<br />
University of Ljubljana<br />
Faculty of chemistry and<br />
chemical technology<br />
Slovenia<br />
vidcopi@gmail.com<br />
Abstract<br />
Cetane number is one of the most<br />
important quality parameters of diesel<br />
fuel. Different standard test methods<br />
are accepted (EN 590:2013) and<br />
can be applied for the determination<br />
of cetane number (EN ISO 5165) or<br />
derived cetane number (EN 15195,<br />
EN 16144).<br />
Standard test method ASTM<br />
D7668:2014a or EN 16715:2015,<br />
respectively is the latest developed<br />
and standardized test method for<br />
the determination of derived cetane<br />
number (DCN). It is already listed<br />
in ASTM diesel fuel specifications<br />
(ASTM D975, ASTM D6751,<br />
ASTM D7467) and included in the<br />
draft prEN590.<br />
This paper presents the results of<br />
the validation of test method ASTM<br />
D7668:2014a (EN 16715:2015) in<br />
laboratory Petrol. The performance<br />
of the test method is aligned against<br />
intended fit for purpose and a comparison<br />
with other test methods is<br />
discussed.<br />
Key words: diesel fuel, cetane number,<br />
derived cetane number, constant<br />
volume combustion chamber, validation<br />
Introduction<br />
Cetane number (CN) is a parameter<br />
that describes the behaviour of diesel<br />
fuel [1] after the injection into a cylinder.<br />
The standard test method for<br />
the determination of cetane number<br />
is the method using the CFR engine:<br />
ISO 5165:1998 [2] / technically<br />
equivalent to standard test method<br />
ASTM D613:16 [3].<br />
Derived cetane number (DCN)<br />
[4] is a measure for cetane number,<br />
which is determined using alternative<br />
instruments / methods, for<br />
example CVCC (constant volume<br />
combustion chamber) alternatives.<br />
One of the possibilities is the use of<br />
PAC¢s Herzog CID 510, according<br />
to standard test method ASTM<br />
D7668:14a [4] / technically equivalent<br />
to standard test method EN<br />
16715:2015 [5].<br />
Disadvantages of method EN ISO<br />
5165 / ASTM D613 (CFR method):<br />
unsatisfactory precision (eg. for CN<br />
= 52 ® r = 0.9 / R = 4.3), the CFR<br />
engine requires a separate room<br />
and space, high investment costs for<br />
the CFR engine, high maintenance<br />
costs and efforts, for the determination<br />
of CN we need: a large amount<br />
<strong>Fuels</strong>&<strong>Lubricants</strong> No. 2 JUNE 2018 23
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