Association Technique Maritime et Aéronautique

Numéro : 2074 - Year : 1988

Linking means used in shortening afloat of a very large crude carrier

R.TEDESCHI, Professor,
D.BOOTE, Ricercatore, Istituto di Ingegneria Navale, Universita di Genova, I.


In order to update the organization of its fleet, an important italian society of navigation decided to reduce the deadweight of a V.L.C.C. from 250.000 TPL to 150.000 TPL. The shipyard responsible of this work had no drydock of sufficient dimensions available, so it was decided to shorten the ship afloat.

The ship was divided into three parts by two cuts then the aft and forward sections were connected to form new unity. Bottom structures were first cut with the ship in slight hogging conditions and then, with an appropriate change in ballast configuration, a slight sagging condition was imposed for the cut of deck structures.

During this second phase, the sagging bending moment was supported by a pair of linking means located in the lower parts of the shell sides and designed to bear the tension forces due to the above mentioned bending moment.

Two different pair of linking means were used during the two cuts. The aim of this paper is to describe the design criteria followed for such linking means and to compare the two solutions on the basis of F.E.M. analysis and experimental data recorded during cut operations.

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