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AVEVA Pipeline Operations for Liquids

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Action Sequence

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  • Last UpdatedJul 04, 2024
  • 2 minute read

At times it becomes necessary to shut down a portion of a pipeline, either in an emergency situation or for routine operations. The correct order of pipeline shutdown is often a significant characteristic of the system, allowing for a shutdown without risk of equipment damage.

The Action Sequence application allows you to pre-configure a sequence of commands. This ensures that the pipeline is shutdown in the correct order. If the Action Sequence has been correctly configured, the Controller will be able to start the sequence with a single command.

The sequence can contain control operations on points in the following tables:

  • Valve

  • Pump

  • Status

  • Multistate

  • Analog

A sequence can contain specified delays and can verify that an operation has taken place within a specified time and execute another sequence if any step fails. It is possible for the Controller to pause, resume, or prematurely terminate a sequence. In addition, the application supports conditional execution, providing the ability to configure checks for flow conditions to decide how to react to different operational scenarios.

The sequence can also contain functions that are executed against other AVEVA Pipeline Operations for Liquids modules.

The Action Sequence application is not limited to stopping or closing objects; it can be used to activate a portion of the pipeline by opening valves and starting pumps.

Key Concepts

  • Configuration and runtime data for an Action Sequence is contained in the Action Sequence (actionSequence) table.

  • Configuration and runtime data for an Action Sequence step is contained in the Sequence Step (sequenceStep) table.

  • Processing of an Action Sequence is command driven.

Key Tasks

  • Using the Advanced Database Editor (ADE) for Action Sequence configuration.

  • Using the Action Sequence Designer to configure steps in the Action Sequence Application.

  • Understanding the state transitions that occur when an Action Sequence is processed.

  • Understanding the state transitions that occur when a Sequence Step is processed.

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