A multiple-pipe type slug catcher otherwise known as a finger-type slug catcher is located at the inlet of a gas processing / LNG facility and is intended to separate the incoming pipeline gas and liquid into separate phases and to provide temporary storage for the liquids received. The separated liquids are further sent to downstream units for processing. Finger-type slug catchers, although simple in design, can occupy significant plot space compared to vessel-type slug catchers. Selection of the type of slug catcher comes with several decisions with regards to determination of liquid storage volume, design pressure, two-phase vs. three-phase separation, design factor, materials selection, solids handling, emergency depressuring and impact on flare design. This paper highlights these design issues surrounding the selection of a finger-type slug catcher in an onshore LNG facility.
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