A Study of the Examination of the Freeboard of a Chemical Tanker Considering Deck Wetness

J. Ocean Eng. Technol. 2010;24(2):41-46.

Park Jong-Heon

Department of Naval Architecture Tongmyong University

갑판침수를 고려한 화학제품운반선 건현 검토에 관한 연구

박종헌

동명대학교 조선공학과

Keywords: Chemical tanker, Freeboard, Deck wetness, Exceeding running time, Ship response, Long-term prediction

핵심용어: 화학제품운반선, 건현, 갑판침수, 초과지속시간, 선체응답, 장기예측

Abstract

This paper deals with the problem of developing a new decision procedure for the freeboard of a coastal chemical tanker going on the coast. The decision procedure is mainly constructed with the algorithm of estimating statistically the time period that deck wetness will last on the deck of the ship. Deck wetness is one of the most important safety factors for sailing of a coaster. It generally means the situation in which the amplitude of the relative motion between the deck and the surface of the wave exceeds the freeboard. Therefore, in this paper, we proposed that the time during which the amplitude remains above the level of the freeboard should be appraised on the basis of statistical theory. A series of numerical calculations were executed for four different coastal chemical tankers (199G/T Type II, III & 499G/T Type II, III). It was demonstrated that the present decision procedure of freeboard is practical for planning the type of coaster sailing in the sea.