The seagoing SWSF and SWBM limits are not to be exceeded when the ship puts to sea
or during any part of a seagoing voyage. In harbour, where the ship is in sheltered
water and is subjected to reduced dynamic loads, the hull girder is permitted to carry a
higher level of stress imposed by the static loads. The harbour SWSF and SWBM limits
are not to be exceeded during any stage of harbour cargo operations.
When a ship is floating in still water, the ship's lightweight (the weight of the ship's structure and its
machinery) and deadweight (all other weights, such as the weight of the bunkers, ballast, provisions
and cargo) are supported by the global buoyancy upthrust acting on the exterior of the hull. Along
the ship's length there will be local differences in the vertical forces of buoyancy and the ship's
weight. These unbalanced net vertical forces acting along the length of the ship will cause the hull
girder to shear and to bend ,inducing a vertical still water shear force (SWSF)
and still water bending moment (SWBM) at each section of the hull.
At sea, the ship is subjected to cyclical shearing and bending actions induced by continuously
changing wave pressures acting on the hull. These cyclical shearing and bending actions give rise to
an additional component of dynamic, wave induced, shear force and bending moment in the hull
girder. At any one time, the hull girder is subjected to a combination of still water and wave
induced shear forces and bending moments.
The stresses in the hull section caused by these shearing forces and bending moments are carried by
continuous longitudinal structural members. These structural members are the strength deck, side
shell and bottom shell plating and longitudinals, inner bottom plating and longitudinals, double
bottom girders and topside and hopper tank sloping plating and longitudinals, which are generally
defined as the hull girder.
Risk of Heavy cargoes & Monitoring the Ship's Loading limits
How to avoid risk of vessel being overloaded
Local loading criteria defining maximum allowable cargo weight in each cargo hold
Structural standards & strengthening of bulk carriers
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
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"A ship which is intended primarily to carry dry cargo
in bulk, including such types as ore carriers and
- Causes of bulk carrier hull damage and failure in operation
- Indication of unusual motion or attitude of bulk carriers and risk management / evacuation
- Deterioration of ships structure and consequences of forward flooding
- Handling water ingress problems in bulk carrier, investigation and countermeasures
- Survival and safety procedure for bulk carriers
- What is a confined space on board ?
- Suitability of Shore Terminals for handling bulk cargo
- Preparation for ships carrying bulk cargo & standard loading condition