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In a horizontal separator, where a low Gas to Oil Ratio (GOR) exists, the ZPV Inlet Device or "Rainmaker" can be installed on the inlet nozzle to eliminate the potential for droplet shatter and to distribute the fluids evenly. Although the ZPV Inlet Device is not a foam free device, it has been shown to be a very flexible unit for use in a crude stabilisation system, where foam reduction is not important, especially when supplied in conjunction with the appropriately designed baffle arrangements.

Advantages of the ZPV Inlet Device (Rainmaker):

  • Handles high throughput and inlet momentum
  • Reduces the momentum of the inlet stream, thus minimising the potential for droplet shatter
  • Reduces foaming problems
  • Provides a minimal pressure drop
  • No operational pressure limit
  • Reduces any turbulence and/or recirculation within the liquid section, thereby promoting gravity-separation
  • Enhances interface level control
  • Effectively handles slugs and surges
  • Wide operational range - typically, providing 100% turndown
  • 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
  • Multiple Inlet nozzles can easily be connected
  • No moving parts, thus no maintenance.

Applications of the ZPV Inlet Device:

  • Production Separators
  • Test Separators
  • Slug Catchers
  • Free Water Knock-Out Drums
  • Enhanced Oil Recovery Systems
  • Floating Production Units (FPUs).

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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