While the transmission compressor stations in pipelines normally operate at relatively low pressure ratios in the order of 1.2 to 1, there are applications that require significantly higher pressure ratios. This paper presents the results of a study conducted for a compressor station design where multiple pipelines feed into one new pipeline. One of the feeder pipelines is designed for significantly lower pressures than the other feeder and the transmission line, As a result, some operating conditions require a very high compression ratio, in some instances as high as 2.8 to 1. The purpose of the study is to select the best feasible turbocompressor unit for the project between two technical available options with different technologies: single compartment and dual compartment compressor. The methodology adopted is designing a (i) compressor station configuration for single compartment compressor with aftercooler and for (ii) dual compartment compressor technology with intercooler and aftercooler, pre-selecting the compressor units to address all operating conditions, perform thermohydraulic simulations, evaluate the gas fuel demand for each year of operation and then evaluate the economics for each alternative. The paper can serve as a guide line for compressor station designers to make decisions not only based on technical aspects - that could lead to higher project life cycle cost - but rather on overall technical and economic aspects that produces lower project life cycle cost.

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