Solve challenging steam and gas transient problems

Model pressure waves and shocks in gas and steam networks during startups, trips, and emergency actions.

• Method-of-Characteristics–based transient solution for compressible flow
• Tracks pressure, temperature, density, velocity, and Mach number over time
• Handles subsonic to choked flow and reflections at junctions and area changes
• Includes pipe/duct heat transfer with temperature-dependent properties

Capture real equipment and control behavior during operational events.

• Compressor transients with speed profiles and staging (start/stop, ramping)
• Time-dependent valve actions (Cv/Kv/K vs. time), regulators, and relief devices
• Simulate trips, restarts, damper moves, and ESD closures with event sequencing
• Check operating limits such as approach to choke, minimum flow, or surge margins

Evaluate depressurization and emergency sequences to protect assets and people.

• Model unit/header blowdowns, isolation steps, and relief/vent interactions
• Predict time histories for pressures, temperatures, and mass flow to stacks or headers
• Compare relief setpoints, vent paths, and equipment configurations across scenarios
• Verify allowable limits at tie-ins, branches, and downstream consumers

Build, compare, and communicate models efficiently.

• Scenario Manager to maintain alternatives in one file with inheritance and comparisons
• Time-history graphs, enveloping plots, animations, and color-mapped network results
• Excel import/export for model data and results handoff
• Layout imports from common piping/duct formats to accelerate model creation
• Color-mapped results to highlight bottlenecks, shocks, and choking
• Configurable reports and model snapshots for reviews and handoffs

Represent real plant interfaces and the events that drive compressible transients.

• Pressure, mass flow, and temperature sources with schedules and ramps
• Time-varying restrictions (dampers, nozzles) and area changes
• User-defined events for trips, interlocks, and control sequences
• Enforce allowable limits (pressure, temperature, Mach) with design alerts

Use reliable thermophysical data for accurate compressible-transient results.

• Real-gas and ideal-gas options with temperature- and pressure-dependent properties
• Steam and common industrial gases available; add custom fluids and mixtures
• Define gas composition by mass or mole fraction for property calculations
• Set reference conditions and units consistently across the model

Quantify pulsations and avoid acoustic resonance in gas/steam networks.

• Build an acoustic network model and compute natural frequencies and mode shapes
• Evaluate pulsation amplitudes versus acceptance limits across operating points
• Identify resonance risks at headers/branches and test mitigation options
• Size and place pulsation control devices (bottles, accumulators, chambers, orifices)
• Use spectral plots and envelopes to document compliance and compare designs