You can add an auxiliary graphic line that indicates the direction of the flow. You can then associate this line with a connector or bus in your plant.
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In an open drawing, use the
command on the Draw toolbar to insert an auxiliary connector.
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Select the auxiliary connector to select it.
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On the Modify Connector ribbon bar, select an appropriate arrow symbol from either the left or right list.
If you want to indicate the flow direction in the middle of an auxiliary connector,
create two lines with arrows and put the end of the second line right at the beginning
of the first line.