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  • Accurately simulate high-speed transients in steam and gas piping systems including choked pipe flow conditions
  • Evaluate overall system response and transient pipe forces after steam and gas turbine trips
  • Predict transient supply pressures, temperatures and pipe flows to operating gas compressors and turbines when one trips offline
  • Simulate tank blowdowns and charging, and how long it takes to reach desired pressures
  • Predict transient pressures and pipe flows due to heat exchanger tube ruptures
  • Easily change system input data including transient valve positions, compressor operation, control set points, pressures, temperatures and more
  • Initiate transients based on time or events in the system


  • Reduce expensive overdesign resulting from analytical uncertainty
  • Increase uptime by understanding how an unexpected transient event will impact pressure, temperature and pipe flow delivery to critical equipment
  • Improve safety by evaluating all system shut down scenarios
  • Validate that required pipe flow can be delivered with certainty
  • Visualize the dynamic response


  • Ensure pressure, temperature and pipe flow extremes are within design allowables
  • Determine imbalanced pipe forces for sizing structural supports
  • Troubleshoot existing systems to determine the cause of operational problems


  • 2D flow diagram or isometric view interface
  • Built-in steady-state solver to automatically initialize system before the transient
  • Automatic pipe sectioning based on steady-state acoustic velocities
  • Compound transient event logic to model complex control sequences
  • Scenario Manager to track all design variants and operational possibilities in a single model file
  • Integrated graphing and reporting
  • Animation tools for visual interpretation of complex transient interactions
  • Generates force imbalance files that can be automatically read into CAESAR II®, ROHR2, AutoPIPE and TRIFLEX® pipe stress dynamic models
  • Built-in libraries of fluids (including NIST REFPROP and ASME Steam Tables) and fittings which can be extended and customized
  • Define component mixtures using the built-in NIST REFPROP and ChempakTM add-on thermophysical databases, totaling over 600 unique fluids

Data Integration

  • Import piping layouts and dimensional data from GIS Shapefiles, CAESAR II® Neutral Files, and PCF files from a wide range of sources
  • Robust Excel integration to import and export data

Add-On Modules

How does it work?

AFT xStream incorporates a highly accurate steady-state solver which provides seamless transfer of initial conditions to the transient analysis. Steady-state solutions are determined using a modified Newton-Raphson matrix iteration plus proprietary methods developed by AFT. The Method of Characteristics is used to solve the transient mass, momentum and energy equations of pipe flow.


Training that meets your needs

Flumen offers several training options to suit the needs of Canadian users. Contact our experts, who can help you choose the most appropriate options for you.

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