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Dos Santos International supplies first DSI Adder Snake for shiploader

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Dry Bulk,

Dos Santos International (DSI) has begun the start up of its DSI Sandwich belt Adder Snake conveyor for the Yara Sluiskil shiploader upgrade project in the Netherlands. DSI was awarded the supply of its Sandwich conveyor by Bedeschi S.p.A, who was chosen fort he supply of the shiploader for the plant in January 2017.

The initial design concept for the upgrade used a conventional conveyor ‘stinger’ boom out from a tripper to the tail of a standard DSI high angle conveyor. This had the disadvantage of an additional transfer and extra equipment, so the client readily embraced the idea of extending the high angle conveyor tail to receive the material directly from the dock conveyor tripper. Layout of the new arrangement immediately revealed that sufficient tripper height did not exist to accommodate the tail pulley of the sandwich belt high angle conveyor. The limitation was so severe that the minimum pulley diameter required for the standard sandwich conveyor belt consumed too much of the space.

The solution was to employ the DSI Adder Snake design, using a lighter construction belt that can be wrapped around a somewhat smaller tail pulley. To accomplish the high angle lift, it swallows the narrow conventional belt, along with its material, into the two wider sandwich belts, allowing the material to enter the sandwich belts with minimal disturbance. It does this without the energy loss and additional equipment required for a standard transfer.

The concept, invented by DSI’s vice president, Marc dos Santos, was inspired by a different application that elevates material from under large storage domes. The use of this technology extends to a wide variety of applications, including marine terminals, stacker/reclaimers, and long overland systems.

Yara Sluiskil

The DSI Sandwich high angle conveyor will transfer urea and amidas prills at a rate of 600 tph at a 45° angle. The material will be transferred from the tripped dock conveyor and elevated to the ship loader boom conveyor. The sandwich conveyor discharge is centred on the bridge rotation axis of the boom, allowing the boom to rotate freely.

Each DSI Sandwich Conveyor uses standard, smooth-surfaced conveyor belts, face-to-face, to gently but firmly contain the product being carried. This not only makes steep angles possible, but also offers a clean, environmentally sound operation due to the material remaining hugged between the belts. The use of all conventional conveyor parts ensures high availability and low maintenance costs. The company’s conveyor is capable of higher conveying speeds and a greater capacity than other high angle conveying methods. The availability of wide belts and hardware makes capacities greater than 10 000 tph easily achievable. High angles of 90° are typical, and lifts of 300m are easily accomplished.

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