Understand Synthetic and Logical valves in Line Blockage

When a Synthetic or Logical valve has child valves configured in Line Blockage, Line Blockage information will be propagated from the child valves to the parent valves. This includes the Flow Path Flag and any listed dependencies on each child valve. If any child valve has the Flow Path Flag assigned, then the parent Synthetic or Logical valve will display the Flow Path Flag. All dependencies assigned to the child valves are collected and displayed on the parent Synthetic or Logical valve.

When you issue a Close command to a Synthetic valve, Line Blockage assumes that this will result in a closure of all valves that the Synthetic valve represents. Prior to the Close command being initiated, Line Blockage will simulate a closure of all the valves that the Synthetic valve represents. If any pumps become blocked by the closure of these valves, then you will be warned and you can authorize a shutdown.

Note: As the Flow Path Flag and dependencies of Synthetic and Logical valves are an aggregate of their child valves, pumps blocked via a Close command may differ from the dependencies listed or may block pumps without the Flow Path Flag being set. A pump may remain unblocked by the closure of any single valve but become blocked by the closure of multiple valves. Line Blockage will always perform a blockage check due to the result of all child valves closing regardless of the valves' current reported Line Blockage state.