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 gspriggs@global.co.za.

Our company is

LSL Consulting (inc) and

Tekpro Projects (Pty) Ltd

PO Box 3609

Randburg2125

RSA

Regards

Graham Spriggs ■

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. ■

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.

Regards,

Ishwar G Mulani

Author of Book : Engineering Science and Application Design for Belt Conveyors

Email : parimul@pn2.vsnl.net.in ■

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.

Cheers ■

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

President

Conveyor Dynamics, Inc.

1111 West Holly St.

Bellingham, WA 98225

USA

PH 360-671-2200

FX 360-671-8450

email: nordell@conveyor-dynamics.com

www.conveyor-dynamics.com ■