When a simulator is configured for an existing pipeline, it always needs adjustment to get it reproducing the line’s exact behavior. The engineer must determine unknown quantities such as pipe roughness and ground thermal parameters, but also identify which things they think they know that are wrong, such as bad meter readings.

This process is much easier if the model tuner follows some basic procedures. Pipe segments and pump or compressor stations should be isolated (in the model), so that tuning one thing doesn’t knock something else out of tune. Tuning is also easier if it’s done in a particular order: from more important parameters to less important parameters, and first steady state then transient.

During the tuning process it might be necessary to set some parameters to unreasonable values, or it might even be impossible to match meter readings: for example, the pipe roughness can’t be tuned below zero. This indicates something is wrong - either a configuration error or bad meter values.

This tutorial will cover the recommended way to do the initial steady state and transient tuning of gas and liquid pipelines; and what sort of ranges of tuned parameters are reasonable and what ranges indicate that there must be meter errors or wrong configuration data.

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