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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:
- Water mist/spray system, through special nozzles provided at the boom head or along the boom, using fresh water only.
- Covers and dyna-flow trunks, used on the boom and at the boom head.
- Mechanical dust extraction systems.
- The correct adjustment of belt scrapers, and deflector plates, boom height from the ground.
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 each, storage and holding tank for surfactant.
- 1 each, chemical metering pump.
- 2 each, Proprietary foam generation boxes.
- 4 each, 2 per box, 2 inch foam hoses and nozzles.
The vessels 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.
International convention for preventing oil pollution at sea - Marpol 73/78
Self unloader components
Function of loop & bucket belt elevators
Self unloaders various cargo handling gears
Various type boom conveyor belts - How the belt sytem practically works ?
Dealing with self unloaders stalled lift belt
Conveyor belt construction & troubleshoot guide
Conveyor belt installation guide
Conveyor belt repair & maintenence guide
Safe working practice onboard self unloading bulk carriers
Preventing conveyor belt fire onboard self unloading bulk carriers
Cargo work safety precautions
Various bulk cargoes - free flow ability
Various bulk cargoes & dealing with cargo hang ups
Navigation in Ice & safety precautions
Preparations for cargo planning, handling & stowage
Maintaining safe stability onboard self-unloading bulk carriers
Procedure for bulk cargo handling prior to and during loading
Loading operations - voyage orders, draft restrictions, various grades and rates
Loading sequence and other related considerations
Preparations for discharging & related guideline
Self unloaders discharging operation
Safety precautions for boom operation
Directing gate operation, gate problems & crew duties
Cargo holds/ tunnels cleaning, maintenance and check items
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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