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Thread: Carrying Material on Top and Bottom Flights

  1. #1
    gpconley Guest

    Carrying material on top and bottom flights

    I am currently investigating cross-feeding alumina conveyor/s.
    The basic data is as followed:
    Dry alumina 990 kg/m3
    Tonnage 3000tph max
    Conveyor speed 2.5m/s
    Horizontal distance 400m
    Elevation 20m approx.

    Instead of using two conveyors operating in different directions, I am considering using a single conveyor carrying material on both upper and lower flights, with a single drive and CW at the higher end.
    Material would be in contact with both sides of the belt (ie. No turnovers). With alumina product and fairly low usage rate of this conveyor, I don’t think this would be a problem.
    Does anyone have experience with a similar application?
    What things should you look for in considering using both flights to carry material?

  2. Dual Carry Conveyors

    Dear gpconley,

    We have successfully commissioned a major 2-way, or "Dual Carry Conveyor" at Namakwa Sands here in South Africa last year.
    It now does 1300t/h of sand in one direction for about 3.5km in one direction, and 991t/h of tailings for about 3km in the other direction at the same time. We are busy making it longer right now. It will be 7.5km long finally.
    We researched 2-ways before going ahead with the project.
    This one is interesting as we swop the top belt with the bottom belt over 190m of the route, using compounded horizontal and vertical curves. This makes the overall arrangement very easy with very few pulleys.
    We have a nice in-house computer model for these conveyors.
    I am presenting a paper on the installation at the next Beltcon conference in July.
    Please feel free to contact me at

    Our company is
    LSL Consulting (inc) and
    Tekpro Projects (Pty) Ltd
    PO Box 3609


    Graham Spriggs
    Graham Spriggs

  3. #3
    Steve Davis

    Steve Davis, B.Eng., P.Eng., CEng, CPEng, FIMechE, FIEAust

    Principal Advisor



    Dual Carry Conveyors

    We have a dual carry conveyor 6.5km long in Western Australia. It operates at around 6m/s and carries iron ore with briquettes on the return. It includes horizontal and vertical curves. It has operated successfully for several years. The belt does use turnovers and only one carry side.
    I can supply more details if you are interested.

  4. Material conveying by upper run and also by return run is used some times. It will require special and spacious arrangements at both ends. The distance 400 m looks to be small and possibly not attractive for such proposition.

    Please also think about locating conveyors for incoming & outgoing material at both the ends.

    Ishwar G Mulani
    Author of Book : Engineering Science and Application Design for Belt Conveyors
    Email :

  5. There is a short dual carry of a few hundred metres here in South africa. It is at Indian Ocean fertilizers at Richards bay. We had a look at it when researching before we did our big one.
    It used to be one way, but they decided to use the return belt as well. They put a tripper on the end of the return belt, and it works fine. Come to think of it, they have two dirty sides of the belt.
    Graham Spriggs

  6. #6
    Lawrence K. Nordell

    Lawrence K. Nordell

    President and CEO

    Conveyor Dynamics Inc.

    Conveyor Dynamics Inc.

    Professional Experience 59 Years / 10 Month Lawrence K. Nordell has 59 Years and 10 Month professional experience

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    Bi-Way Conveying

    Dear Mr. Conley,

    Conveyor Dynamics, Inc. (CDI) did the feasibility study and design audit for the BHP-DRI 7km overland in Western Australia referenced by others in respon

    This system transports 4000 t/h of iron ore fines on the carry strand and 600 t/h of hot briquettes on the return strand. It uses belt turnovers to contain spillage and polution. It is driven at its head and tail stations with 3x900kw drives.

    The hot briquettes have a design temperature of 120 C.

    We are currently proposing a 10 km system that carries products that cannot mix. One a very fine powder. We have a unique solution that solves many problems associated with transport, contamination, and polution.

    We have also designed and installed bi-ways that reverse, which may be the better solution for you. If you do not need to simutaneously transport, I would recommend this procedure.

    Want to know more please contact the undersigned. Visit our web site for a photo of the BHP-DRI overland.

    Lawrence Nordell
    Conveyor Dynamics, Inc.
    1111 West Holly St.
    Bellingham, WA 98225
    PH 360-671-2200
    FX 360-671-8450

  7. #7
    Robbin Wood Guest

    Two-Way Material Transport on 1 Belt

    Sandvik has accomplished this task in the past using both strands of a solid steel belt to carry parcels in either direction. Steel belting (depending upon the choice of materials we offer) is very resistant to wear and abuse by heavy, corrosive and abrasive materials.

    Sandvik has recently celebrated our 100th anniversary of the first usage of such a belt for conveying abrasive materials.

    Please look us up at our website at: ''

    We always work with our clients to custom-engineer the system for your application.

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