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Thread: Dredge pump for home made dredge

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  1. #1
    us
    Jun 2018
    Arazona/montana
    10
    18 times
    Prospecting

    Dredge pump for home made dredge

    Ok I'm building a new dredge . My question is has anyone ever thought about a double suction centrfugel pump on a dredge ? I only want one engine one pump to carry but want the power of 2 pumps. So why not a double suction centrafugal pump I ask .well as far as I can tell they don't exist in sizes weights we need .I'm designing one currently and should have a prototype this winter to test . I'm looking for input

  2. #2
    Make America Great Again

    Apr 2013
    Oregon
    1,556
    3554 times
    All Types Of Treasure Hunting
    why?, just get a bigger pump, on a dredge pump the bite of the impeller is tuned to the torque of the engine.
    maybe you could combine a direct mount and a pedestal pump connected with a pulley on the same motor
    but would bog down considerably. water does not compress much.
    on my 4" dredge I was running an 8hp with a big old gold-divers pump, a few months ago I built a much lighter setup
    I actually get a little more suction, the engine is a 205cc B&S but runs at 4000rpm paired with a Keene p180 pump.
    . (only weighs 45lb)
    Click image for larger version. 

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    .
    my old 8hp motor (90lb's) and a shot of my 11hp with a Keene 3x4 pump
    Click image for larger version. 

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    et1955 and Clay Diggins like this.
    " A pessimist is an optimist with experience "

  3. #3
    us
    Jun 2018
    Arazona/montana
    10
    18 times
    Prospecting
    Why not lol I like to have more power than I need but if I can make a double suction pump that can hook a t80 to the end would be more compact and more efficient becouse a single impeller has wasted high pressure behind the impeller so less hp required to run . I'm an engineer that sees room for improvement and I can't carry the weight I could 10 years ago

  4. #4
    us
    Aug 2004
    Olympia WA
    Minelab Xterra 70, Minelab SD 2200d, 2.5", 3", 4"and several Keene 5" production dredges, Knelson Centrifuge, Gold screw automatic panner
    801
    1738 times
    Prospecting
    Quote Originally Posted by Lynx equipment View Post
    Why not lol I like to have more power than I need but if I can make a double suction pump that can hook a t80 to the end would be more compact and more efficient becouse a single impeller has wasted high pressure behind the impeller so less hp required to run . I'm an engineer that sees room for improvement and I can't carry the weight I could 10 years ago
    Simply put...you don't necessarily need more power to make the dredge work better, you just need enough.
    The best design is not a over powered, super efficient pump/motor combo. It is the most effective combination of HP and pump that will get the job done with consideration given to reliability, fuel efficiency and weight.

    I can build a dredge with so much power and suction that it will break your fingers if you put you hand over the nozzle....but it will not be efficient or lightweight.
    As an engineer you are probably familiar with the K.I.S.S. design method...it definitely applies here
    winners58 likes this.

  5. #5
    us
    Apr 2014
    SW Oregon
    275
    491 times
    Prospecting
    You also have to consider the amount of flow thru your sluice box. To much flow and you will tend to blow gold out.
    N-Lionberger and winners58 like this.

  6. #6
    Charter Member
    us
    Mine President, XPBC

    Dec 2013
    Arcata, California
    Fisher 1212-x Fisher Gold Bug 2 Whites 4900/SP3 Rocker boxes, Keene sluices, Bazooka sluice, 2.5", 4" lowbankers, highbankers. Witch Sticks.
    523
    571 times
    Prospecting
    Quote Originally Posted by mendoAu View Post
    You also have to consider the amount of flow thru your sluice box. To much flow and you will tend to blow gold out.
    That's just what I was thinking.

  7. #7
    Charter Member
    us
    Mine President, XPBC

    Dec 2013
    Arcata, California
    Fisher 1212-x Fisher Gold Bug 2 Whites 4900/SP3 Rocker boxes, Keene sluices, Bazooka sluice, 2.5", 4" lowbankers, highbankers. Witch Sticks.
    523
    571 times
    Prospecting
    Quote Originally Posted by Lynx equipment View Post
    Why not lol I like to have more power than I need but if I can make a double suction pump that can hook a t80 to the end would be more compact and more efficient becouse a single impeller has wasted high pressure behind the impeller so less hp required to run . I'm an engineer that sees room for improvement and I can't carry the weight I could 10 years ago
    By "hook a t80 to the end" do you mean directly connecting the engine shaft through the two impellers to the shaft of the T80? if so you're going to fry that poor little compressor pretty fast.

 

 

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