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Calculating Head loss

Discussion in 'General Discussion' started by jnjsad, Oct 15, 2012.

  1. Oct 15, 2012 #1
    jnjsad

    jnjsad Inactive User

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    It has been a long time since I've had to visit this subject and am struggling to figure out what return pump I should go with for my remote sump. I will try to draw the layout.



    top of tank:

    --------------------------------------------]

    | |

    | 4' | 4' (second overflow return)

    |-------------------------------------------|

    5' |

    | 3'

    |

    _____4'_________

    sump



    So the longest flow is 4' + 5' + 3' + 4' = 16'. Do I use that as my max head - or do I have to also calculate the 2nd return 4+3+4 = 11 for a total of 27'?
     
  2. Oct 15, 2012 #2
    Pete H.

    Pete H. Well-Known ReefKeeper

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    I think your pressure head is also going to be dependent on the type of pipe and the types of bends. It also depends on the way the pipe is running. There is different head loss for vertical pipes and horizontal pipes. I am having a hard time telling what you diagram is showing. But if you had a bit more details, I might be able to give you a better answer. (I am sure others can and will chime in also.). /DesktopModules/ActiveForums/themes/_default//emoticons/wink.gif
     
  3. Oct 15, 2012 #3
    phishcrazee Riverside

    phishcrazee Experienced Reefkeeper

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  4. Oct 15, 2012 #4
    jnjsad

    jnjsad Inactive User

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    Do I include ALL pipe return or just the longest length?
     
  5. Oct 15, 2012 #5
    phishcrazee Riverside

    phishcrazee Experienced Reefkeeper

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    All.....you want to include everywhere the water will have to travel to get to its destination.
     
  6. Oct 15, 2012 #6
    jnjsad

    jnjsad Inactive User

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    dang - that is 27' not including elbows/unions yet.
     
  7. Oct 15, 2012 #7
    dead fish Iowa City

    dead fish Dead Fish

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    You might need a steam engine to pump that water.
     
  8. Oct 15, 2012 #8
    jnjsad

    jnjsad Inactive User

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    Okay, I miscalculated. It appears by a previous comment and the head loss calculator, that horizontal legnths create minimal drag on the overall head loss. I think I have this figured out now. So vertical lengths are 8'...while the remaining 12' are horizontal...which makes a difference I've guessing...b/c calculator indicates a Mag Drive 18 can do the trick - but I plan to create a manifold for reactors so will be looking at the Tunze Silence Pro Pump 1073.110.
     
  9. Oct 15, 2012 #9
    Pete H.

    Pete H. Well-Known ReefKeeper

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    Right, horizontal lengths will give minimal drag. (Unless you are using really small piping. lol) But, mostly you are going to be concerned with the water being pushed up vertically and if there are many unions and tight turns for the water like tight 90 degree elbows.
     

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