If you are not up to the job of designing the conveyor you have three options :-

1) employ an experienced designer who can do it

2) buy the conveyor complete from an experienced company

3) DON'T BID !!

Yet someone else wanting free design! ■

Seventy kilometres is hardly conventional.

You need to be more aware of the possible route options. Curves & elevations "TBA" will not get you very far. For a project that size you will need a Consultant to work on your behalf with an experienced supplier.

As Designer implies, your bid process will be a large operation in its own right. How many rivers do you have to cross? Longsor, gempa & banjir all affect cross country routes in Sumatera & Kalimantan. Is the infrastructure able to support huge intermediate drive stations?

I'll be in Jabar next month & could help you bid for the bid. ■

Could be a nice little earner for you ...... ■

You should also consider the use of a capsule pipeline for your coal as it will cost less to operate and maintain and will not have all the extra equipment needed for movement of material from a to be and with out transfer points.

google capsule pipelines

www.capsu.org for a history of capsule pipelines

www.pnuetrans.net- a capsule pipeline builder/system builder ■

Dear Mr. Purba,

I read with some interest your request for technical support on the supply of a 75 km overland belt conveyor system in Indonesia.

I believe I know the mine and owner. We have supplied extensive analysis on their friable coal to enable minimum product degradation between mine and port. Included in this circuit is the handling system at the mine, the 75 km overland, the multiple high speed transfer chutes for the connected multiple flight lengths, the horizontal curves, product sizing, port storage, and reclaim system to the barge.

Testing was done with their product on another overland to measure the coal degradation over many kilometers.

We have just completed the successful commissioning of the Curragh 20.3 km curved coal overland conveyor with its 7.5m/s high speed belt, large idler pitch, special idler configuration and special high speed chute transfers with a witness to low dust and low coal degradation. We have worked on conveyors with speeds to 8.4 m/s and beyond.

CDI has also designed and have operational many other long overland and downhill conveyors with high tonnage, high speed, high power, with complex geometries and horizontal curves. References can be supplied. Some of these systems are published.

Many of these systems employ super efficient low rolling resistant rubber compounds for better economics and superior Total Cost of Ownership. These technologies have been perfected with our in-house technology base. Our designs are extremely competitive. We are leaders not followers. Visit our website for some added insight.

We have experience in Indonesia’s Kalimantan Peninsula on: a) 24 km Indo Cement Overland, b) 13 km Kaltim Prima Coal Overland and, c) 6 km PT. Bontang Overland and its upgrades. We are also doing a 15-17 km study for another coal client on the peninsula.

Please advise your further interest in collaboration via my contact details below.

Best of Luck, ■

You should go for a very reliable partner given the size of the project.

Not only an engineering company, but an organization that can also supply the hardware according to their calculations.

I suggest you contact www.continental-conveyor.co.uk as they performed succesfully the ATH job in Scotland.

Please ask for Mr Russel Turner who is the best designer of long overland conveyor.

Kind Regards

John Paul ■

Do you have anyone bidding for the covers on the 75km overland conveyor? We are a manufacturer of Belt Conveyor Covers

you can contact me at sales@capotex.com ■

Im interested to know more about this project

What is the status of it, has construction started ?

Also what mine is and who is constructing the conveyor

Rgds

Shane ■

Just to acknowledge the fact of long overland conveyors of standard belt conveyor systems. I am currently patenting some specialist drive heads along with a few other innovative items to produce a 2600mm wide 5 roll trough & return at >8 metres per second belt conveyor system capable of delivering approximately 121 million tonnes per year to replace rail or road delivery transport. This will be a single flight conveyor with 17 to 20 booster drives, each with 4 x 500kW drive motors, without tripping the belt. The belting will be ST10,000. The product will not be disturbed from loading to discharge with the product surcharging angle of 0 degrees within the trough profile of the belting at 85%. There is safety built in to the system and my patented conveyor (DunnEasy Idler Assembly) is under patenting self-tracking(DunnTracker) as required combined with my patented applied 'OneFits Roll' which are standard to 'Weigh Scale' specifications at axial and radial load ratings of >80kN and much reduced Rim Drag (presently tested 0.23N per roll @ 1500rpm). I know what is within the box and I am looking outside without going to extremes of pushing the assemblies past 1,500mm centres as experience of other wider than 2,500mm idler spacings has proven to be somewhat severely lacking in reliability hence the reason to stay at 1,500mm. This system will be elevated on 5 to 20 metre piers in a specific gallery modules.

Just info to whet your appetite. ■

Dear Mr. Dunne Easy,

Please keep your forum content to facts on conveyor design. It is improper to over-hawk products. You can make simple claims with some facts that draw the reader to investigate your capabilities. However, you do not offer the "what, why, and how" many of your particular hadrware pieces and features are unique and should be evaluated based on facts, except for the Dunne Easy Idler Frame. Some point of interest on your new drive patent would be helpful, since this is a focal point of your posting. What are its most salient points?

How do you achieve a very low rim drag (.23 N torque/roll or for 3 rolls = .69 N/roll) would be of interest and the exclusive nature of how yours differs from the industry norms? Have you compared your rolls on the Newcastle University independent laboratory idler test rig? The figure you claim should be considered at load, speed, temperature, grease, seals, bearing design and roll dimensions. Is this with no load, slow speed, hot grease, .......??

A drive system with 17-20 booster stations is a fraught with reliability issues, least of which are control stability concerns. It has not been done to this extent any where in the world to my knowledge. Have you installed any such drive, if so where?

The issue of 1500 mm idler spacing is debatable. I recall a discussion on the high failure rate on Curragh and your explanations. For your record, Laign O'Rourke finally went back to site and made many adjustment to the 20 km OLC operation, the first since its commissioning. Chief amount them was the fix to the vibrating feeder oscillation. This fix apparently stopped a lot of operator/maintenance grieve. The client is now more receptive to keeping good maintenance and knowing why. Almost everything is back to normal. Go take a look.

Hmm, ST-10,000 N/mm belt. I know of only one supplier, Goodyear, who has passed the test qualification (>15,000 cycles at better than 55% of dynamic breaking strength (BS) @ 6% - 55% cycle of BS) to date. Do you know of other suppliers that have made and passed the qualification test on a cyclic destructive test? ■

My last paragraph, prior posting, refers to the endurance efficiency of a steel cord belt splice. For ST-10,000 N/mm, some manufacturers have built such a belt and tested the splice to DIN 22101 standard. To correctly set the standard, first you must test the breaking strength of a steel cord (multiple times (>=6)) and then apply this to the splice design under study. Cord count x cord breaking strength (N) / belt width (mm) = ST-Rating (N/mm) ■

The thread was posted 4.4 years ago. The thread starter has not participated in any recent activities. Please let us say goodbye to Mr. Purba of 4 years ago. If there is further interest in the subject of long conveyors, please start another thread. ■