Slugcatchers are installed at the end of two-phase pipelines and dense-phase pipelines. The technical specifications of a slugcatcher for a two-phase pipeline are based on the gas-liquid flow behavior at the various operating conditions. For a dense-phase pipeline these specifications are derived from the flow behavior in the pipeline during depressurization. These flow studies, which are carried out in the design stage of a transmission system, should be sufficiently accurate to provide proper sizing of the transmission line and slugcatcher. The paper deals with: • the methods and the quality of these methods for calculating the flow behavior in a two-phase pipeline and in a dense-phase pipeline—a comparison of both types of transmission systems is given; • the basic design of a terminal slugcatcher, including some causes of possible malfunctioning—an optimal design of a terminal slugcatcher is also discussed.

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