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AVEVA Pipeline Operations for Liquids

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Protected Location

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  • Last UpdatedJul 04, 2024
  • 2 minute read

A Protected Location refers to a Flow Network (a station) that has its own set of unique rules to prevent it from entering an unsafe operating condition. Each Protected Location is associated with a single Flow Network. Flow Networks can exist at any granularity—nested within other Flow Networks, or existing as a top-level "parent" network.

The following, two sub-applications make up the overall entity known as Protected Location:

Low Mode

The Low Mode application consists of a Mode Detector (a status point) used to switch the Protected Location between higher and lower operating intensities (High mode and Low mode, respectively). Before the application allows the Protected Location to switch to High mode, it checks for violations on certain upstream and downstream analog, rate, status, multistate, pump, valve, and/or remote points. If it encounters one or more violations, the application alerts the Controller and does not proceed with the command. The Controller has the option to override the warning or fix the violation conditions. After the Controller fixes the violation condition, the application allows the Protected Location to switch to High mode.

If the application detects a violated condition when a Protected Location is in High mode, it traverses upstream and switches a configured number of Protected Locations it encounters to Low mode via the configured action sequence associated with each Protected Location.

Shutdown Sequence

The Shutdown Sequence application consists of a number of configured steps that the system executes in order to shut down all pumps at a Flow Network when a CLOSE command blocks off flow to a pump such that the pump is:

  • Upstream blocked

  • Downstream blocked

  • Shut in (blocked on both sides)

The steps involved in setting up a Protected Location are as follows:

  1. Configure a station as a Flow Network (create an fnet record).

  2. Create two Action Sequences (actionSequence records)—one to cover the steps involved in a shutdown sequence; the other to cover the steps involved in switching a Protected Location back to Low mode from High mode.

  3. Create the Protected Location (a protectedLocation record) using the records from the first two steps.

For more information, see Action Sequence.

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