SAMSON DRAFT CONTROL PDF

SAMSON has been used on many occasions to determine risks of oil outflow. The casualty data as may be purchased from Lloyd's List Intelligence are specified in the separate files field specification and coding tables. The process of determining the casualty rates, as it has been done in 2004 for the Dutch North Sea area is described. Also historical trends may be derived from the world-wide data, allowing for the estimation of accident probabilities in future years. With world-wide accident statistics the correlation between casualty rate and ship type and size may be added. When the exposure for each of the accident types has been calculated and the accident records of the same area are available, the casualty rates can be determined. Only if the crew succeeds to anchor in time or to regain control the contact can be avoided. The latter has a strong resemblance with the contact - a vessel versus an object or stranding line.įor contacts there are different models for a powered collision, when a vessel gets off course and does not correct her course in time, and a drifting collision which occurs when a vessel is not under control and drifts with wind and current onto an object. The models used to calculate the exposure are described for ship - ship collisons for ships underway and for a collision with an anchored vessel separately.

SAMSON DRAFT CONTROL PDF

The parts constituting SAMSON are described in detail in separate pdf files. Together with typical bow forms and tank layouts for the different ship types and sizes, an estimate of the outflow of cargo and fuel oil may be made. SAMSON also contains models for the damage in case of a collision or contact. The availability of accident data usually limits the number of factors that may be used. The casualty rates are dependent on ship type and size, on weather conditions and probably also many more factors. The same process is followed for other types of accidents by comparing the exposure to the number of accidents. If the number of meeting encounters is compared with the observed average number of head-on collisions per year a so-called casualty rate may be derived - which has the same function as the causation factor used by IWRAP. The expected number of ship encounters is calculated from the number of ship movements.

This yields a number of ship movements (per type, size and direction) for each individual link. draft and cargo, and with a preference to use a nearby TSS. For each voyage a route is constructed on the virtual network of shipping links, based on shortest route but obeying restrictions on e.g. The model uses a voyage database which contains all ship movements over a period of time (usually one year), specifying ship type, ship size, port of departure and port of destination. The development originally started as an EU project (COST301) and has also known a number of other working titles in the past. The risk assessment model SAMSON has been developed for the Dutch government since the mid-80s.

Samson draft control