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The key to Free Water KO Drums is a combination of a large separation volume coupled to a long residence time. The result is a high degree of separation. However, during the life of a well the amount of produced water can increase considerably. This leads to the need to revamp the internals as shown in the following before and after study.

Above: This graphic shows droplet re-entrainment in the gas phase and the localized overloading of the mesh pad demister. Below: The inlet device holds up the flow increasing both the residence time and the droplet separation efficiency. The revamped gas box with 20, 4G-FD® Demisting Cyclones facing the vessel’s inlet. The revamp CFD model included the swirl in each cyclone.

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Case Studies

Demisting Cyclones Flow Assurance

The Zeta-pdm Ltd 4G-FD® Demisting Cyclones are designed to polish the gas prior to compression. The CFD model of these cyclones includes the swirl generation element. It is the modelling of swirl that allows the CFD model to accurately predict the droplet separation characteristics of these cyclones with the client’s process data. The inclusion of swirl raises the benchmark within the industry and renders obsolete the practice maintained by the competition of modelling cyclones as straight flow through a box.

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