Parallel Pipe Systems or Multipath Pipeline Problems
Two or more sections of piping (branches) of different diameters, lengths and/or pipe materials originating and terminating at common junctions
The flow in each branch will divide to make the head loss due to friction in each branch the same.
Common problem: Water flows through the two, parallel piping branches as shown in the diagram. Which of the two piping branches will carry more flow? Use nominal pipe diameters.