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Pressure issue on pipeline splitting

  1. Sep 11, 2013 #1
    Can anyone give me some assistance on this problem:

    I have a pump below a sump of 1m high and pumping upward in a pipe that splits near the end.
    I require at least 140kPa pressure on EACH pipe. I know I need to enter the pressure in terms of head into the total head (physical height - suction height + total head loss) required, but what happens with the split? Do I add 140kPa to the total head required, or do I add (2 x 140kPa)?

  2. jcsd
  3. Sep 11, 2013 #2
    The pressure in the pipes will be determined by the discharge conditions, pipe material, pipe size and geometry, any valves, etc. But to answer your question, it's just the 140 kPa.

    What do you mean, though, by "add 140 kPa to the total head required"? Are you sizing the pump?
  4. Sep 11, 2013 #3


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    Without flow, you don't have to add anything for the split, just height is relevant (you can imagine a single pipe as many pipes right next to each other if you like, it does not change the result). With flow, it depends on the pressure loss due to the flow.
  5. Sep 11, 2013 #4
    I guess I didn't explain clearly...sorry about that.
    I have a pipe system that runs from the pump 8m up to 2 cyclones. The total head would be the 8m + headloss due to friction + headloss due to split + headloss due to any bends, valves, enlargements, etc. + head needed at exit. I need 140kPa (14.27m) in each cyclone. Do I need to add the 14.27m once to the rest of the head loss and height or do I need to add it for each cyclone? I know in parallel pipes the headloss is equal across each pipe, just scratching my head over the pump pumping into the cyclones.
  6. Sep 11, 2013 #5
    Yep, just add it the once.
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