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In order to minimise any disturbance of the oil/water interface in a two-phase liquid / liquid separator, we recommend the insertion of an Optimised ZP-Vane Type Inlet Device. Due to the gently curved nature of the vane and the large area of the inlet device, low velocities are achieved at the outlet of the device, thus minimising risks of droplet shatter and optimising the oil/water separation.

The optimised vane type inlet device will have the same attributes as our standard vane type inlet device, but will be able to handle a high liquid loadings under flooded conditions and direct the flow to the interface.

Advantages of the Optimised ZP Vane Type Inlet Device:

  • Separates the bulk liquids present within the inlet stream
  • Reduces the momentum of the inlet stream, thus minimising the potential for droplet shatter
  • Wide operational range - typically providing 100% turndown
  • Reduces any turbulence and re-circulation within the liquid section
  • Provides a minimal pressure drop
  • Reduces the size of the inlet nozzle on a new build project
  • Allows a greater fluid throughput for a set nozzle size, on a revamp project
  • Easy to install in new and existing separators
  • No moving parts, thus no maintenance.

Applications of the Optimised ZP Vane Type Inlet Device:

  • Liquid/liquid separation only

Case Studies

Slug Catcher Flow Assurance

Gas production systems may operate in the "slug flow" multiphase regime in which large volumes of liquid are interspersed with the gas. Under these conditions, the arrival of the liquid slugs can be detrimental to separation performance and the mechanical stress levels are greatly increased. In the example shown below, Zeta-pdm was asked to analyse the failure of a slug catcher vessel. Inspection showed that the slugs had caused mechanical failure of the separation internals. Subsequently, a simulation study yielded a vastly improved understanding of the flow behaviour, enabling Zeta-pdm to recommend internals better able to withstand severe operating conditions.

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