GL and Container Carriers
 
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GL and Container Carriers

      3/16/1999

Germanischer Lloyd has taken a distinct lead in the market for container carriers. At present, almost every second container ship (46 percent) is built to GL class. GL has also achieved a strong position in other ship segments: with 25 percent for multi-purpose ships and 20 percent for gas tankers (figures as of October 1998).
GL conducted extensive investigations into increased incidence of forebody damage and specifically addressed demands on the forebody design. Modern container carriers are optimized for stowage space and thus have different forebody and afterbody lines in comparison to conventional ships. For ships with a flared bow (frame flare in the foreship of more than 40), there is a considerably higher risk in rough seas than was previously believed; an increased incidence of forebody damage has been observed in recent years. An analysis showed that in some cases the ships of a particular operator exhibited damage, whereas this was not so for sister ships in the fleets of other shipowners. The causes for this are varied: high engine outputs and tight schedules often lead to unduly high speeds during bad weather. Because of the good seakeeping behaviour, especially of larger units, the seaway is easily underestimated. Moreover, during the last two years, extreme wave conditions were encountered much more frequently in most ocean regions than was previously the case. Climatic changes are suspected to be the reason. Germanischer Lloyd reacted to this trend and revised its Rules: since 1998, the Society has made the highest demands on the forebody structure of container ships (see the report in GL-Magazin II/98, December 1998, and also the contribution on the EU project DEXTREMEL, in the same issue of GL-Magazin).
More information: Germanischer Lloyd


 


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