Two return pumps

Discussion in 'Pumps and Waterflow' started by Andreas, 18 Jul 2008.

  1. Andreas

    Andreas

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    i've got 2XOR 3000's i want to use as return pumps for my 900l system.

    I'm planning on connecting both the pumps so that they enter the display tank together.i would like to know if it's better joining them
    • with a t-piece at the bottom(sump level) - (wont the pumps compete to much because the flow is to strong) or
    • letting both pumps force the water to the top and then connecting them to flow directly into the tank
    thanks
     
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  3. Rory

    Rory Admin MASA Contributor

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    Rather don't connect them at all.
     
  4. Mekaeel

    Mekaeel Moderator MASA Contributor

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    I would say one pump will be suffiecient on that tank Andreas. Use 2 if you there is going to be lots of bends and elbows (Head loss).But dont join them,you might be putting too much strain on the pumps.
     
  5. Muz

    Muz

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    I am planning to also have 2 return pumps.. I have not given it any thought yet as to how I was going to connect them, but now that this thread is here we can discuss it.

    I was thinking of just running them independantly or each other, ie not join them at sump level..

    Mek.. what do you mean if you don't join them there will be too much strain? don't understand.
     
  6. Mekaeel

    Mekaeel Moderator MASA Contributor

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    Hey Muz,I think you read it wrong.Check again
    "But dont join them,you might be putting too much strain on the pumps."
    Get what i mean?That is,dont link the 2 pumps together via a T piece :)
     
  7. Rory

    Rory Admin MASA Contributor

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    Any bends/joins/reducers/spraybars/etc will cause more backpressure and reduce flow and strain the pumps more.
     
  8. HenkHugo

    HenkHugo

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    and if one fails the water will just shoot out of the failed pump....
     
  9. Muz

    Muz

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    True..
     
  10. Andreas

    Andreas Thread Starter

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    you right henk!;) never thought about that
     
  11. Andreas

    Andreas Thread Starter

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    do you guys think that 3000l -(head loss)would be sufficient?
     
  12. Mekaeel

    Mekaeel Moderator MASA Contributor

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    Whats the maximum jet on that pump?Besides one pump should be fine,those pumps are powerfull.
     
  13. Rory

    Rory Admin MASA Contributor

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    I'm sure you must mean OR3500's anyway... They should be fine. I had 1 on my 200L tank and with a T, a tap and 2 90's it was still good enough.

    T pieces are honestly the worst invention ever... If you have the water "hit" the T in the middle it robs a helluva lot of flow. If you let the water go straight through with some if it going to the side hardly anything will go to the side.
     
  14. leslie hempel

    leslie hempel Moderator MASA Contributor

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    Bud i used 2 or3500 on seperate returns and it was noisy. One turned out to be enough the other i put on closed loop and never looked back
     
  15. leslie hempel

    leslie hempel Moderator MASA Contributor

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    Personally i think you will be defeating the object of using 2 pumps if you connect to the same return. What size holes are in your overflow?
     
  16. Andreas

    Andreas Thread Starter

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    2X32mm holes
     
  17. Andreas

    Andreas Thread Starter

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    nope Rory it's the 3000's, i think the newer ones are 3500 if i'm not mistaken.
     
  18. Mekaeel

    Mekaeel Moderator MASA Contributor

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    Andreas, what are pumps are you going to run on the controller then?
     
  19. Andreas

    Andreas Thread Starter

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    howzit mek,i've got 2X1100 , 2X1500, 1X820 and 3 OR3000's.I was planning on running one of the OR in the display tank and use the other two for the return
     
  20. leslie hempel

    leslie hempel Moderator MASA Contributor

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    so did i was hell of a noisy...
     
  21. Mekaeel

    Mekaeel Moderator MASA Contributor

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    Good stuff Andreas.The flow will be lekker in the tank.Corals will be happy :)
     
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