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DEFINITIONS

Bulk density – is the weight of solids, air and water per unit volume. It includes the moisture of the cargo and the voids whether filled with air or water.

 

Cargoes which may liquefy – means cargoes which are subject to moisture migration and subsequent liquefaction if shipped with a moisture content in excess of the transportable moisture limit.

 

Combination carriers (OBO or O/O) – a ship whose design is similar to a conventional bulk carrier but is equipped with pipelines, pumps and inert gas plant so as to enable the carriage of oil cargoes in designated spaces.

 

Concentrates – these are the materials that have been derived from a natural ore by physical or chemical refinement, or purification processes. They are usually in small granular or powder form.

 

Conveyor system – means the entire system for delivering cargo from the shore stockpile or receiving point to the ship.

 

Flow moisture point – is that percentage of moisture content, when a flow state develops.

 

Flow state – is a state which occurs when a mass of granular material is saturated with liquid to such an extent that it loses its internal shear strength and behaves as if the whole mass was in liquid form.

 

Incompatible materials – are those materials which may react dangerously when mixed and are subject to recommendations for segregation.

 

Moisture content – is that percentage proportion of the total mass which is water, ice or other liquid.

 

Moisture migration – is the movement of moisture contained in the bulk stow, when as a result of settling and consolidation, in conjunction with vibration and the ship’s movement, water is progressively displaced. Part or all of the bulk cargo may develop a flow state.

 

Pour – means the quantity of cargo poured through one hatch opening as one step in the loading plan, i.e. from the time the spout is positioned over a hatch opening until it is moved to another hatch opening.

 

Transportable moisture limit – the maximum moisture content of a cargo that may liquefy at a level which is considered safe for carriage in ships other than those ships which, because of design features of specialized fittings, may carry cargo with a moisture content over and above this limit.

 

Trimming – a manual or mechanically achieved adjustment to the surface level of the form/shape of a bulk stow in a cargo space. It may consist of altering the distribution or changing the surface angle to the point, perhaps of levelling some or all of the cargo, following loading.

 

Read More: BULK CARRIERS

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