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Conveyor belt installation guide for self- unloading bulk carriers

Belt conveyor
Fig: Belt conveyor

Gravity-fed self-unloaders with hoppered holds and gravity gates are the mainstay of on board a self -unloader. These vessels are suitable for granular free-flowing cargoes.

As the name implies, these vessels use gravity to release cargo through gates located at the bottom of the vessel's cargo holds onto conveyor belts running beneath the cargo area. The cargo is then transported to an elevating system, lifted above deck level and transferred onto a discharge boom conveyor. The cargo is offloaded via the discharge boom, port or starboard, depending on the unload facility.

Loop belt, incline belt and bucket elevator self-unloading systems are all gravity-fed technologies. New belts are normally installed by Motors Technicians, however the following points are to be noted when handling a new belt: Stowage of a spare or new belt;
Belt checks, tracking and training

The term “tracking” applies to the running alignment of a conveyor belt. The term “training” applies to the adjustments carried out to track the belt correctly.

When a belt is tracking correctly it is running in the centre of its track and is therefore free from edge contact with steel work. A correctly trained belt will not make contact with the side guide rollers, except in the case of the Flexowell Lift Belts where the belt is always in contact with the rubber side guide wheels. A conveyor belt must not be operated if the edge of the belt is in contact with any steelwork, as this will cause serious damage to the belt.

When a new belt has been fitted it is often necessary to carry out some “training” adjustments. The pillow block bearings fitted to the spindles of all the large diameter pulleys in the belt system have slotted holes for their base bolts. There are also jacking screws fitted at each bearing base. This allows the lateral alignment of the pulleys to be adjusted. The brackets supporting the return rollers are also slotted for the same reason, as are the carriage frames.

Related information

Cargo holds bulk flow gate, basket gate & non - consolidated feeder

Related information

  1. Self unloader components

  2. Function of loop & bucket belt elevators

  3. Self unloaders various cargo handling gears

  4. Dealing with self unloaders stalled lift belt

  5. Conveyor belt construction & troubleshoot guide

  6. Conveyor belt installation guide

  7. Conveyor belt repair & maintenence guide

  8. Safe working practice onboard self unloading bulk carriers

  9. Preventing conveyor belt fire onboard self unloading bulk carriers

  10. Cargo work safety precautions

  11. Various bulk cargoes - free flow ability

  12. Various bulk cargoes & dealing with cargo hang ups

  13. Navigation in Ice & safety precautions

  14. Dust suppression procedure & environment protection

  15. Preparations for cargo planning, handling & stowage

  16. Maintaining safe stability onboard self-unloading bulk carriers

  17. Procedure for bulk cargo handling prior to and during loading

  18. Loading operations - voyage orders, draft restrictions, various grades and rates

  19. Loading sequence and other related considerations

  20. Preparations for discharging & related guideline

  21. self-unloaders-discharging-operation

  22. Safety precautions for boom operation

  23. Directing gate operation, gate problems & crew duties

  24. Cargo holds/ tunnels cleaning, maintenance and check items

  25. Procedure for transporting coal on self- unloading bulk carriers

Our detail pages illustrated many safety aspects of Bulk carrier

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Operation of sea going bulk carriers involved numerous hazards . Careful planning and exercising due caution for all critical shipboard matters are important . This site is a quick reference to international shipping community with guidance and information on the loading and discharging of modern bulk carriers so as to remain within the limitations as specified by the classification society.
It is vital to reduce the likelihood of over-stressing the ship's structure and also complying with all essential safety measures for a safe passage at sea. Our detail pages contain various bulk carrier related topics that might be useful for people working on board and those who working ashore in the terminal. For any remarks please Contact us

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