Single-phase pipeline simulation on SIROGAS. Now in your browser.
FlowTran-X is built on SIROGAS — purpose-built for single-phase gas, liquid, and dense-phase pipeline simulation. Steady state and transient. Multiple compositions. Unlimited network scale.
Steady state and transient. In the same model.
Steady state
Run multiple steady-state chapters in a single model. Results are available to interrogate the moment the calculation completes — no CSV export, no downstream spreadsheet step.
Transient
Begin from steady-state initial conditions or a restart file, then model full operational behaviour: valve closures, compressor trips, pipe breaks, and linepack tracking with the same engine.
| Phenomenon | Description |
|---|---|
| Linepack | Mass tracking per pipe and network. AGA8 density method. |
| Valve closure | INPIPE: time-based close/open, pressure-setpoint triggering. |
| Pipe break | Dedicated device type. Models rupture scenarios. |
| Compressor trip | Full station dynamics including recycle valves, unit coolers, performance maps. |
| Restart | Write state files at any timestep. Resume from any prior time. Enables multi-month operational simulation. |
| Automatic timestep control | The solver sets its own timestep through each transient run. |
| Batch calculation | Multiple cases per model. Run scenario sets automatically. |
The right physics for each fluid.
FlowTran-X is purpose-built for single-phase fluid simulation. Each equation of state is matched to the fluid it describes.
BWRS
BWRS (Starling 1973). Gas, liquid, and dense phase across 15 standard component gases. Thermodynamic derivatives determined analytically, not by numerical approximation. Viscosity via Lee (1966). The primary equation of state for natural gas pipeline work.
BWRS-HCO
Extends BWRS to include hydrogen (H₂) and carbon monoxide (CO) as perfect gases, with zero interaction factors. Dutton gas-interchangeability analysis included for blend assessment.
Linear Liquid / LiqCO₂
Linear Liquid equation of state for single-mixture liquid modelling. LiqCO₂.eqs covers carbon dioxide in liquid and dense phase above critical pressure.
NIST REFPROP
The NIST REFPROP equation of state, available for the 15 standard natural-gas components including CO₂ and H₂S.
Every component your pipeline actually has.
- Supply pointSource feed with its own fluid composition, blended per supply point.
- Demand pointOfftake with specified flow or pressure.
- JunctionConnects pipes within the network.
- Compressor stationFull station dynamics across one or more units.
- Compressor unitIndividual unit with performance map, recycle valve, and unit cooler.
- In-pipe valveINPIPE: time-based close/open and pressure-setpoint triggering.
- RegulatorsFlow and pressure regulation across the network.
- TankStorage volume within the network model.
- Pipe breakDedicated device type for rupture scenarios.
- Restart stateResume a simulation from a nominated prior timestep.
Each device carries its own configuration and reporting, modelled with the same engine across steady-state and transient runs.
Modern access. No constraints.
Browser-based
No install, no dongle, no local-machine dependency. Accessible across a corporate network or remotely on any device.
Real-time collaboration
Multiple engineers on the same model simultaneously. Model sharing between users.
AWS compute
No hard network-size limits — the only boundary is available cloud memory. Transient simulations that would fail on a local machine run cleanly.
Backward compatible
All existing FlowTran 2.0 models import directly. No rebuilding. Your work carries forward.
SI, Imperial, and USA unit systems.
Work in SI, Imperial, or USA unit systems, and define your own custom units where a project needs them.
See it run on your network.
Bring an existing FlowTran 2.0 model or a problem you are working on, and we will show you steady state and transient in the same browser session.