Return flow, how much is too much?

Discussion in 'Pumps and Waterflow' started by moz, 4 Dec 2007.

  1. moz

    moz

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    I have just upgraded my return pump, from less than 500l/h to about 2100l/h. As soon as I hooked up the new pump it cleared all the sand from the area directly under the return, is this too much flow? My tanks size is 1200mm x 440wide x 640deep. One more question to stop a Durso type standpipe from whistling, all I need to do is increase the size of the air hole at the top, right?
     
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  3. Alan

    Alan Admin MASA Contributor

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    Moz i turn my tank over between 2 and 3 times an hour through the sump any faster and it impedes the skimmer performance.
     
  4. moz

    moz Thread Starter

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    Great, I go from too little, to too much.
    I guess that means that I'll have to drill a hole in the outlet, to decrease the flow?
     
  5. Mike

    Mike Retired Moderator

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    Redirect the return from down to across - or even better, make up a tee piece and have 4 or 5 outlets in a reverted tee piece (with the cross of the T along the bottom of the tank, with the outlets pointing up or across.)

    As for the durso, put a piece of thin air pipe down the durso, then you will (hopefully) stop the drain sound.
     
  6. Hill

    Hill

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    Flow may be fine. Remember you need to work out the head loss including piping and bends. Your tank volume is plus minus 340L. You may get away with it. Is your return pointing straight down in the display? Can you point it towards the front glass at and angle to get good deflection?
     
  7. moz

    moz Thread Starter

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    Cheers everybody

    Tomorrow, I'll visit builders warehouse, get some pipe fittings and play.
     
  8. 120gallons

    120gallons

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    Don't use your return pump for flow in your tank. Use a closed loop or powerheads etc.
     
  9. moz

    moz Thread Starter

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    I've put a tee on the pump outlet, with one branch going into the tank, and the other branch in the staying in the sump, on the sump branch I have added a valve, adjusting the valve changes the proportional flow in each branch, so now I have control over my flow, and it seems to be working very well.
     
  10. Mike

    Mike Retired Moderator

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    Cool, has this slowed down the system or is the water still moving well?
     
  11. moz

    moz Thread Starter

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    It has slowed the system down, but it is just for return from the sump. This weekend I'll hook up my 2 x SEIO M1100's and 2 x M820's for water movement.
     
  12. Tom

    Tom

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    Hy Moz! If you have too much flow from the return, put in a squddy! :)
     
  13. Kanga

    Kanga Retired Moderator MASA Contributor

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    I think the prob might be that the overflow would not cope;)
     
  14. moz

    moz Thread Starter

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    Overflow worked perfectly, even with full flow. The only problem was that the durso was sounding like the whistle of an old fashioned kettle or maybe a steam train:), and all my sand was getting blasted away. So I decided to go with Alan's suggestion of a 2 to 3 times turnover not the 5 to 6 that the pump was giving me.
     
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