Default Flow Direction Determination Rules
When you create a pipeline in any sequence, the flow direction function assigns default flow directions automatically based on the following rules:
• Rule 1—The flow direction of a pipeline series is automatically determined by the direction of the first pipe segment in the series.
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You can create a pipeline series by concatenating several independent segments that were created with the Extend, Follow, and Connect commands. Each of these commands can have opposing flow directions. When you connect the segments to form a pipeline series, the flow direction of the series is assigned based on the direction of the pipe segment that was created first.
If you create the first segment in the correct flow direction, this ensures the correct flow direction for the entire series. Otherwise, you must reverse the resulting series.
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• Rule 2—The flow direction of a new series, which is split and created as a result of inserting a branch fitting or stub-in, is the same as the original series from which it is created.
• Rule 3—The flow direction of a branch series is the same as the flow direction of the pipe segment in the branch line that was created first.