The design and operation of a gas pipeline requires, as a rule, considering the composition and average specific gravity of the gas already transported or to be transported.

Now the truth is that such gas will not always have the same composition or specific gravity, given the fact that it varies significantly from winter to summer, and that it can even change along the pipeline.

This paper was done with the intention of showing the effects that those changes can have in transportation capacity, power used and in transported energy. In order to do so, we based our study simulating Steady-Flow conditions and considering extreme situations.

The basic principle "equal transported volume does not imply equal transported energy or equal mass" was a clear evidence in our study, and in some cases the differences were significant.

At the same time this is particularly important because we can appreciate the implications of using commercial criteria indistinctly, for instance the sale of energy volumes, transportation of mass volumes or design criteria.

The main objective of this paper, then, is to learn about natural gas composition -as far as transportation is concerned-both for the design and operation of a pipeline.

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