Return pump rate

Discussion in 'Pumps and Waterflow' started by Martinf, 18 Jan 2015.

  1. Martinf

    Martinf

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    Im was using a reef octopus hy-4000 but wad only giving me a return rate of 1000lph.

    It's only pumping 1,2m high. So I think it's time for new pump.

    The complete system is +/- 350l( DT 250l ).

    What rate ?
    What pump can you recommend ?
    AC or DC ?
     
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  3. butcherman

    butcherman Moderator MASA Contributor

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    here are the specs on your current pump
    Are you sure you are only getting 1000l/h?

    If so I suspect your lack return flow might have to do with the plumbing more than the pump.

    I have a 500l tank and i use a tunze 1073.05
    I also thought it was to small i redid the return line went from 20mm to 25mm and also reduced elblows using flexible pipe where possible. this sorted me out.
     
  4. Martinf

    Martinf Thread Starter

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    The plumbing is 22mm to 40mm. I tried it with a 22mm flexible hose and I got exactly the same. I suspect the pump.
     
  5. RiaanP

    RiaanP Moderator

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    how many elbows do you have on the return line?
     
  6. Martinf

    Martinf Thread Starter

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    4 x 40mm and 1 x 22mm
     
  7. butcherman

    butcherman Moderator MASA Contributor

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    for every 90 degree elbow you can calculate its flow reduction by adding roughly an extra 30cm onto the height.

    1.2m + (5 * 0.30m) = 2.7m

    your plumbing is on the limit for the pump.
     
  8. Martinf

    Martinf Thread Starter

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    I do understand where you coming from but as mentioned above i tested it with a flexible pipe with no 90deg bends and got the same. I bought the pump second hand.
     
  9. NO3

    NO3

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    Really?
     
  10. RiaanP

    RiaanP Moderator

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    test with similar size pump. If the flow rate is drastically better, then you know the pump needs to be replaced.

    DC is better, nowadays with Eskom and emergency power. But with more components there is more possibilities for failure.

    What is the thickness of the return line?
     
  11. butcherman

    butcherman Moderator MASA Contributor

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    then it might be the pump is kaput
     
  12. Martinf

    Martinf Thread Starter

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    @RiaanP

    The return line is 22mm for the first 400mm the goes to 40mm.

    I'm looking at the Waveline DC4000 or the Aqua medic OR3500. Altenatively the Jebao DC-6000.

    Which one would you recommend ?
     
    Last edited by a moderator: 26 Nov 2015
  13. RiaanP

    RiaanP Moderator

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    both DC pumps got controllers that you can set to lower flow rates. Nice option.
    Also allows you to use the feed mode option if you do not have a tank computer / controller.

    The OR3500 pump is a tried and tested option. Will run forever.

    What is the power consumption of all these pumps. Take into account that if you want to lower your power consumption, replacing return pumps and skimmer pumps is the place to start.
     
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