Water hammer & surge analysis software

Predict pressure surges, flows, and forces during water hammer events with an MOC-based transient solver.

• Models cavitation and column separation.
• Handles event- and time-driven operations (valve closures, pump trips/restarts, ESDs).
• Accounts for wave speed and system elasticity.
• Visualizes results with animations and pressure/flow/force plots.

Capture real equipment behavior during trips, reversals, startups, and control actions.

• Centrifugal and PD pump transients with pump inertia/driver torque and four-quadrant curves.
• NPSH checks and check valve dynamics to mitigate slam.
• Time-dependent valve characteristics (Cv/Kv vs. time, open % vs. time, K-factor vs. time) and control valve logic with rate limits.
• Relief valve modeling with opening profiles and setpoints.

Evaluate and size surge-control equipment such as surge tanks, gas accumulators, and air/vacuum breaker valves, to keep pressures within limits.

• Design alerts to enforce allowable pressures and velocities.
• Compare device sizing, setpoints, and locations across scenarios.
• Optional modules for pulsation (API 674 checks) and slurry water hammer.

Build, manage, and share models efficiently—and connect results to stress analysis.

• Scenario Manager to track alternatives in one file.
• Excel import/export for model data and results.
• Import piping from CAESAR II® Neutral files, PCF files, and GIS shapefiles.
• Export transient forces to CAESAR II®, TRIFLEX®, ROHR2, and AutoPIPE.

Clearly communicate transient behavior.

• Animate pressure waves, flows, and levels; apply color maps on the model.
• Create time-history graphs, max/min envelopes, and cross-plots.
• Export output data, animations, workspace models, and report-ready graphs.

Use verified, extensible databases for liquid transients.

• Standard Fluids, NIST REFPROP, and ASME Steam Tables included; optional Chempak (~700 fluids with mixing).
• Support for temperature-dependent properties and user-defined fluids.
• Non-Newtonian options (e.g., Power Law, Bingham Plastic, Herschel-Bulkley) for specialty applications.

Start from a consistent steady-state and enforce allowable conditions.

• Automatic steady-state initialization with reservoirs, control valves, and time-varying boundaries.
• Elevation profiles and partially filled pipe ends where systems drain between runs.
• Design alerts for pressure, velocity, NPSH, and other engineering limits.

Analyze water hammer in slurries where solids change wave speed, damping, and friction.

• Model both settling and non-settling slurry transients.
• Account for solids concentration effects on density, viscosity, and acoustic wave speed.
• Apply slurry-specific friction correlations to estimate pressure loss and energy requirements.
• Evaluate pump performance and NPSH under slurry conditions; assess derating needs.
• Optimize pipe diameter and target velocities to reduce deposition or erosion risk.

Quantify positive-displacement pump pulsations and avoid acoustic resonance.

• Build an acoustic model to calculate natural frequencies.
• Check peak-to-peak pulsation against acceptance limits (e.g., API 674).
• Size and place pulsation control devices (accumulators, volume chambers, orifices).
• Identify resonance risks in header/branch configurations and verify mitigation across the operating range.
• Use spectral plots and envelopes to compare alternatives and document compliance.