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piping calculations
3

piping calculations

piping calculations

(OP)
how to calculate  the right pump(s) when you have two pumps
pumping into a ring and  there are branches off of that ring and the branches all discharge to the same place overboard

RE: piping calculations

Don't let the ring topology confuse you.  Kirchoff's laws apply.  Does that help?



Mike Halloran
Pembroke Pines, FL, USA

RE: piping calculations

For a distributed network i would recommend that you make a model in a simulation tool - if you want to optimise the energy consumption and make sure that all branches meets the required capacity.

This can be done e.g. in excel or using a dedicated modelling tool.

Best regards

Morten

RE: piping calculations

As Mike says, Kirchoff's laws apply.

The Kirchoff equation solution is iterative in that the equations for hydraulics are nonlinear.  

You could use a Hardy Cross (HC) method, as that includes the iterative proceedure for the flows in the ring.  The flows in the branches are determinate when the branch inlet heads (at the ring) and outlet heads (overboard points) are known.  The pump heads must be examined at each HC iteration and, if the flowrate in/out of the node where the pump branch enters the ring changes significantly during an iteration, the new head must be applied to the ring at the pump's discharge point.

However, I'd do as Morton suggests and use a network modeling program.  Perhaps EPAnet might be useful in this case.

BigInchworm-born in the trenches.
http://virtualpipeline.spaces.msn.com

RE: piping calculations

(OP)
huge thanks for the help!! this clears it up tremendously

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