Analysis of operation experience and the efficiency of external ice hull reinforcement

Authors: V.A. Kulesh, N.G. Pec, A.V. Priyomkin

Abstract

The article analyzes the effectiveness of outside ice hull reinforcement of the refrigerator. For the analysis, the data of residual thickness measurements, performed in the period from 2008 to 2018 were used. The ship was accepted into the class of the Russian Maritime Register of Shipping at the age of 25 years after the procedure of renovation of the hull and ice reinforcement to the class Ice1. The refrigerator worked in the difficult conditions during commercial fishing voyages in the Okhotsk Sea, including mooring on waves and in ice. The analysis has shown a high efficiency of ice hull reinforcement in the form of external weld segments of a semicircular cross section with a radius of 30 mm and with a spacing of 280 mm. It has been shown that the horizontal orientation of the segments in the areas of the board with a longitudinal frame set system has disadvantages in terms of strength. The outer segments have a deterioration rate 3 times greater than that of the protected shell. The level of deterioration of the outer segments does not exceed 10 %. It has been also shown that it is advisable to supplement such hull reinforcements with diagrams of safe ship speeds in broken ice for the captain. Outer ice reinforcement should be considered as an effective measure to improve the ice characteristics of foreign-constructed ships accepted into the Russian fleet.

Keywords: ice conditions, external reinforcements, hull strength, ice abrasion, efficiency.

References

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About authors:

V.A. Kulesh - DSc, professor, Far Eastern Federal University, Vladivostok, e mail: vkulesh@mail.ru

N.G. Pec - Far Eastern Federal University, Vladivostok, e-mail: pecng85@gmail.com

A.V. Priyomkin - NTD GROUP ULTRAMARINE CO., LTD, Hong Kong, e-mail: priyomkin@inbox.ru

Issue: 56/57 (2019)

For citation: V.A. Kulesh, N.G. Pec, A.V. Priyomkin. Analysis of operation experience and the efficiency of external ice hull reinforcement. Research Bulletin by Russian Maritime Register of Shipping. 2019, No. 56/57, pp. 84-93.

UDC 629.12.001

Pp: 84-93