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MySep Main Features

MySep software has a wealth of features, that provide engineers with tools and insights to design and evaluate separation vessels in a comprehensive and efficient manner. 

Phase separation

  • Gas - liquid separation
  • Liquid - liquid separation
  • Liquid - sand separation

Automatic vessel sizing

  • Full automatic sizing of the vessel based on selected equipment and other optional criteria
  • Side-by-side comparison of multiple vessel configurations
  • Automatic vessel weight calculation for each vessel configuration

Simulator communications

  • Bi-directional communication with process simulators:
    • Aspen HYSYS®
    • Petro-SIM™
    • ScimSci™ PRO/II
    • UniSim® Design
    • VMGSim™
  • Pull process data directly from process simulator into MySep
  • Send vessel carryover and pressure drop to simulator
  • MySep-RunTime geometry file generation

Vessel Motion

  • The Motion module enables time transient simulation and analysis of liquid level height behaviour in the vessel as a result of motion of the facility (e.g. and FPSO)
  • Time transient calculation of liquid level heights
  • Automatic checking of internals against the dynamic liquid levels
  • Warnings are shotn if the moving liquid levels cause operational issues for the separation internals
  • "Video" mode that shows the dynamic level behaviour in the vessel (pitch and roll views)
  • Level monitor graphs vs time
  • Data export to Excel spreadsheet

Vessel weight

  • Calculation of shell and heads thickness
  • Vessel weight calculation
  • Nozzles and internals weight calculation
  • Selectable vessel codes: ASME VIII Div 1, ASME VIII Div 2, PD 5500
  • Selectable material of construction


  • Input up to 6 design and operating cases
  • Selectable input units (SI/metric and English/Imperial and combinations) and automatic conversion upon unit selection change
  • Pull data directly from HYSYS, Petro-SIM, PRO/II, UniSim Design and VMGSim
  • Import case data from Excel spreadsheet

Inlet piping

  • Droplet size distribution prediction
  • Liquid entrainment fraction and flow rate prediction
  • Selection of Key liquid phase mode for gas-liquid separation calculations
  • Flow regime map and data

Inlet section

  • Nozzle size, velocity and momentum calculation
  • Inlet device selection: no inlet device, half pipe, vane type, inlet cyclones
  • Basic hydraulic calculations, checks for gas blow-by/excessive carryover, and performance predictions for inlet cyclones

Liquid levels

  • Direct input of liquid levels setpoints
  • Auto-calculation of level setpoints from height, volume and time requirements input

Gravity separation section (gas-liquid, liquid-liquid and liquid-sand)

  • Liquid from gas separation calculation (droplet size distribution based)
  • Oil droplet from water separation calculation
  • Water droplet from oil separation calculation
  • Plate pack coalescer selection, dimensioning and performance
  • Phase inversion point predictions
  • Oil in water and water in oil outlet concentrations approximation
  • Perforated distribution baffles design, pressure drop and level differences
  • Degassing bubble size calculation
  • Sand separation calculations: carryover and deposition height profiles

Demisting section

  • Demisting device selection & performance predictions: Mesh pad, vane pack and cyclones
  • Detailed geometrical parameters of equipment (e.g. mesh void fraction, wire diameter, cyclone swirl angle, diameter, etc, etc) used in performance calculations.
  • Calculation of mesh pad flooding point, cyclone gas momentum and axial shear stress
  • Detailed design / sizing of demisting equipment
  • Drain pipes design and verification

Design layout

  • To-scale layout drawing of vessel, nozzles and internals
  • Selection of different vessel configurations, including: Liquid boot, split flow (central inlet + 2 outlets, central outlet + 2 inlets)
  • Setting / adjustment of nozzle and internals dimensions and layout

Pressure drop

  • Prediction of pressure drop across nozzles, internals and vessel
  • Prediction and consideration of drainage head in equipment drain pipes 


  • Prediction of liquid in gas carryover and droplet size distribution at each separation stage in the vessel
  • Option to override predicted droplet sizes and liquid loads (mist) at each separation step
  • Categorised design notifications tagged with "CRITICAL" or "INFO" if physical of equipment design limits are exceeded by user
  • Detection and warning for onset of re-entrainment in gravity section of horizontal separators
  • Export droplet size distribution data to Excel spreadsheet

Operating envelope

  • Generation of graphical charts of a vessel’s operating envelope
  • Iso-carryover curves
  • Operating limits
  • Custom point
  • Multiple indicators
  • Chart controls

Sensitivity analysis

  • Plotting of selectable parameters in a chart
  • Wide range of selectable operating parameters
  • Custom calculation ranges and number of points
  • Chart controls

Report generation

  • Full report generation
  • Option to include own company logo
  • Select with MySep calculation sections are to be included in the report

Datasheet generation

  • Automatic generation or revision of vessel process datasheets
  • Possibility to use your company’s Excel-based datasheet template

External data processing

  • Define your operating cases in an excel spreadsheet and have MySep run these cases and return all the key operating and performance parameters back to the spreadsheet