Is there a handy way to determine if a horizontal pipe is running full if the flow rate is known?

Is there a handy way to determine if a horizontal pipe is running full if the flow rate is known?
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Answer :

If Q/d2.5 is greater than or equal to about 10.2, then the pipe is said to full. In this case, Q is in GPM  (U.S. Imperial gallons per minute) and d is in inches. Reference: Pocket Guide to Chemical Engineering,  ISBN: 0884153118
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