Abstract

Several fi xed percentage of C6+ composition splits for hydrocarbon dewpoint (HCDP) determination, based
on empirical studies of most pipeline gases, have been published in a Gas Processors Association standard;
but may not truly refl ect the C6+ composition of a particular pipeline gas and for that reason may affect
the quality of always predicting the HCDP of a pipeline gas in the same level. In addition, several different
software packages are available to the industry to perform dew point calculations, and each of these may yield
different predictions using the same gas compositions and equations of state. This work, therefore, presents the
examination of the consistency of several common C6+ composition splits of pipeline gas, applied to a large set
of fi eld and hypothetical C6+ data, for determining HCDP. Results comparison of calculated HCDP as well as
cricondentherm (using HYSYS® with Peng-Robinson equation of state [EOS] and Soave-Redlich-Kwong EOS)
between the various C6+ composition splits is made. Ranking of the common C6+ split schemes for HCDP
determination on the basis of C6+ mole fraction is also presented.