September 22nd 2026
Engineering Confidence Before Commissioning: The Value of Dynamic Process Simulation
In complex process engineering, discovering a design or control problem during commissioning can be expensive, disruptive and, in some cases, potentially hazardous.
Dynamic process simulation enables engineers to explore how a plant will behave before it is built, modified or brought online. Unlike steady-state modelling, which represents the process at a fixed operating point, dynamic simulation shows what happens as conditions change over time.
Start-ups, shutdowns, equipment trips, pressure changes, control responses and abnormal operating conditions can all be tested in a safe, virtual environment. This gives engineering teams the insight they need to validate designs, optimise control strategies and identify potential operability issues much earlier in a project.
Understanding the plant beyond steady state
Steady-state simulation remains an essential engineering tool, particularly for establishing heat and material balances. However, a process plant rarely remains at one stable operating point.
Flow, pressure, temperature, compositions and inventories continually change as equipment starts and stops, feed conditions vary and control systems respond. The behaviour of individual fluid components can also change significantly as temperature and pressure change through the plant.
Dynamic simulation adds this crucial time-based dimension.
TSC’s high-fidelity process models are built using first-principles thermodynamics and designed to match the plant’s steady-state heat and material balances. They can then be used to investigate the transient and abnormal conditions that cannot be fully understood through steady-state analysis alone.
This makes dynamic simulation particularly valuable when evaluating:
- Plant start-up and shutdown sequences
- Process interactions between different plant areas
- Control and safety system performance
- Compressor behaviour and anti-surge protection
- Blowdown and depressurisation
- Equipment, valve and vessel sizing
- Alarm and shutdown philosophies
- Changes in feed composition or operating conditions
- Plant capacity and potential bottlenecks
Instead of waiting until commissioning to discover how the complete system behaves, engineering teams can test it during the design phase.
Validate process and control designs before implementation
A well-designed process still depends on its instrumentation and control systems responding correctly.
Through dynamic process simulation, complex control loops can be modelled alongside an accurate representation of the process. Engineers can test the relationship between the plant, its instrumentation and the proposed control philosophy before the final system is fabricated or commissioned.
This can include validating:
- Control system philosophy
- Cause-and-effect logic
- Shutdown and interlock sequences
- Start-up overrides
- Advanced control loops
- PID controller settings
- Alarm behaviour
- Operator graphics
- DCS and ICSS implementation
- Standard Operating Procedures
Control sequences can be tested under both normal and abnormal conditions, revealing problems that may not be apparent from reviewing the design documentation alone.
Controllers can also be pre-tuned against the simulated process before start-up. This helps reduce the amount of troubleshooting and adjustment required on the live plant, supporting a faster and more controlled commissioning period.
Investigate safety-critical scenarios
Some of the most important plant conditions are also the most difficult, or unsafe to test on the real system.
Dynamic simulation provides a controlled environment in which engineers can investigate plant trips, equipment failures, emergency shutdowns and other what-if scenarios without placing people, equipment or production at risk.
The model can support HAZOP studies, safety system verification and the validation of shutdown logic. It can also be used to determine whether the process can be safely restarted once active shutdowns have been reset.
For pressure relief, blowdown and depressurisation studies, the speed and accuracy of the model are especially important. TSC simulators typically operate with a model loop speed of less than 20 milliseconds, making them suitable for highly dynamic engineering studies where conditions can change extremely quickly.
The result is stronger evidence that the process, controls and safety systems will respond as intended—not just during normal production, but when the plant is under pressure.
Compressor and anti-surge studies
Compressors are among the most complex and safety-critical pieces of equipment found in gas transmission, oil and gas, petrochemical and other process facilities.
Their performance cannot be assessed in isolation. It is affected by changing gas properties, connected pipework, valves, control systems and the wider process.
TSC provides compressor modelling and operability validation studies throughout the planning and design phases of a project. These studies can investigate load balancing, compressor performance and anti-surge protection across a wide range of operating conditions.
Anti-surge systems can be modelled using algorithms from major control system suppliers, enabling their performance to be tested and optimised before final designs are implemented.
TSC first carried out dynamic simulation and operability validation studies for UK National Gas Transmission compressor stations in 1999. Since then, our models and engineering studies have supported 18 compressor station upgrades and gas storage projects across the UK National Transmission System.
This depth of experience enables potential control, operability and equipment protection issues to be identified much earlier in the project lifecycle.
Optimisation and debottlenecking
Dynamic simulation is not only useful when designing a new plant. It can also help operators improve the performance of an existing facility.
Equipment sizing and plant capacity are often influenced by transient peaks and minimums rather than normal steady-state values. A dynamic model allows engineers to explore how vessel levels, valve flows, pressures and temperatures respond as operating conditions change.
This insight can support:
- Vessel and control valve sizing
- Heat exchanger performance analysis
- Capacity evaluations
- Advanced process control optimisation
- Plant debottlenecking
- Energy and emissions studies
- Testing of proposed equipment changes
- End-of-life and asset-life-extension studies
- Production and profit improvement planning
Different engineering options can be evaluated virtually before committing capital or interrupting plant operations. This helps teams identify the most effective solution while reducing the risk of costly re-engineering.
Accuracy that supports engineering decisions
For a dynamic simulator to provide meaningful engineering evidence, it must reproduce the behaviour of the plant with a high degree of accuracy.
TSC’s full multi-component thermodynamic models have achieved independently verified results within 2% of measured values for flow, level, pressure and temperature across large, thermodynamically active oil and gas systems.
This modelling capability has been used to verify systems at more than half of the UK National Gas Transmission System’s major compressor stations. It was also used to verify plant operations and control systems for the £600 million Highly Active Liquor Evaporation and Storage project at Sellafield.
In the Sellafield project, dynamic simulation identified a potential operability weakness during the engineering phase. The issue could then be addressed before final commissioning, avoiding the significantly greater cost and disruption of discovering it on the completed plant.
One model, value throughout the plant lifecycle
The value of a dynamic model does not have to end when the engineering study is complete.
A Multi-Purpose Dynamic Simulator can be developed and reused throughout the design, commissioning and operational life of the plant.
The same core model can support:
- Process and control verification
- Safety analysis
- DCS and ICSS checkout
- Operating procedure development
- Operator training
- Operational support and debottlenecking
During design, the model helps engineers understand process interactions and validate equipment, controls and safety systems. As commissioning approaches, it can support control system testing and the development of operating procedures.
The simulator can then be adapted into a realistic operator training system, giving personnel experience of the process and control interface before the plant starts up. Once the facility is operational, the model remains available for testing modifications, evaluating capacity and investigating future improvements.
This lifecycle approach maximises the value of the original modelling investment while creating consistency between engineering design, commissioning, training and ongoing plant support.
Reduce uncertainty before it becomes costly
The greatest value of dynamic simulation is the opportunity to find and resolve problems while they are still relatively straightforward to correct.
By testing the process, controls and operating philosophy together, engineering teams can make decisions based on how the complete plant is expected to behave—not simply how individual elements perform at steady state.
This can result in:
- Fewer commissioning issues
- Reduced commissioning time
- Less equipment and control-system re-engineering
- Improved plant safety and operability
- More effective operating procedures
- Better-prepared operators
- Greater long-term value from the simulation model
From early design validation and compressor studies to commissioning support, operator training and plant optimisation, dynamic simulation provides confidence at every stage of the process lifecycle.
Planning a new process, control-system upgrade or plant optimisation project? Speak to TSC’s engineering team about how dynamic simulation could help you validate performance, reduce project risk and make better-informed engineering decisions.
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