DEVELOPMENT OF THE VESSEL STRENGTHENING SCHEMES FOR GROUND CONTACT

Abstract

Exploiting and developing the coast of the Russian Arctic and Far Eastern seas are important. Traditionally, it is associated with the use of vessels for grounding and carrying out cargo operations. However, the requirements for such vessels were introduced in the Register Rules only in 2017. Previously, these operations could be interpreted as accidents. The Sea of Okhotsk is one of the largest seas in Russia, but there is only one large port on its coast - Magadan. The northern part of the Far Eastern coast is characterized by tides with sea level differences of up to 10 m and more. Heavy ice conditions also play a significant role. In these conditions, expensive berths and port infrastructure development are not economically justified and so traditional schemes of cargo operations are still important. However, there are not enough special vessels. The issues of the longitudinal, transverse and local strength of the hull of a small Japanese-built vessel with deadweight of 420 tons are considered in the paper. The vessel is oriented to work off the western coast of Kamchatka. It is capable to deliver both general cargo and liquid fuel. It has been shown that the longitudinal strength of the hull, the transverse strength of the vessel holds and the strength of the vessel stem satisfy the NAABSA1 class symbol. The ship plating and bottom longitudinal girders in the areas, where the floors are located via three and four spaces, as well as the sternframe sole require strengthening. Strengthening schemes, whose realization ensures the possibility of obtaining the NAABSA1 class symbol and cargo operations of the vessel aground are considered and proposed.