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Environment protection - Dust suppression system for Self-unloading bulk carriers

The main concern of environmental protection in relation to cargo operation onboard a self unloading bulk carrier is the suppression of dust during cargo discharging. Eeffective operating procedures,personnel protection, crew awareness & training both shipboard and ashore is of prime importance. Dust masks must be worn by personnel in the Tunnel while discharging.

The SUL vessels may discharge cargoes into reception facilities situated close to a residential area. The residents may also raise objections to this and therefore this may affect the future employment of the vessel. Some places have dust and noise monitoring systems, and have set limitations. The frequent spread of cargo dust over fertile soil may spoil its fertility and the amount of cargo lost in terms of dust can be up to 2%. It is essential that all measures are taken to suppress the dust from the cargo being discharged.

Methods used to suppress dust are:

Noise levels can be effectively lowered by the correct lubrication of all running parts and setting them to optimum.

The ‘Foam’ Type Dust Suppression System:

The system is comprised of the following:
  1. 1 each, storage and holding tank for surfactant.
  2. 1 each, chemical metering pump.
  3. 2 each, Proprietary foam generation boxes.
  4. 4 each, 2 per box, 2 inch foam hoses and nozzles.

The vessel’s provide water, with shore, electrical power and compressed air. Once the mixture of air, water and surfactant is set, the system runs automatically. The chemlock surfactant is completely non toxic, and water soluble.

Dust suppression system – Maintenance & operation

Fig: Self unloading bulker GYPSUM CENTENNIAL

In order to minimize air pollution by dust from cargo during discharging of certain cargoes and to meet terminal requirements to prevent dust emission at transfer point ship-shore during discharging, Dust Suppression systems have been installed and must be in use as required by the Commercial Operator or Terminal.

Requirements to use, or not to use, the Dust Suppression systems, must be clearly indicated in Ship/Shore checklist .

There are a few types of Dust Suppression systems:

- The most simple one is a set of nozzles arranged at the end of the unloading boom to spray fresh water onto the cargo when dropping off the boom belt;

- Other systems use a special foam producing medium, which, when mixed with water, cover the cargo surface while the cargo is still running on the conveyor belt.

Fresh water must be used in Dust Suppression systems unless otherwise specifically stated by the manufacturer or by clear order issued by the commercial operator.

Related info:

International convention for preventing oil pollution at sea - Marpol 73/78

Related information

  1. Self unloader components

  2. Function of loop & bucket belt elevators

  3. Self unloaders various cargo handling gears

  4. Various type boom conveyor belts - How the belt sytem practically works ?

  5. Dealing with self unloaders stalled lift belt

  6. Conveyor belt construction & troubleshoot guide

  7. Conveyor belt installation guide

  8. Conveyor belt repair & maintenence guide

  9. Safe working practice onboard self unloading bulk carriers

  10. Preventing conveyor belt fire onboard self unloading bulk carriers

  11. Cargo work safety precautions

  12. Various bulk cargoes - free flow ability

  13. Various bulk cargoes & dealing with cargo hang ups

  14. Navigation in Ice & safety precautions

  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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