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

*Department of Naval Architecture, Tongmyong University, Busan, KoreaKEY WORDS: Chemical tanker 화학제품운반선, Freeboard 건현, Deck wetness 갑판침수, Exceeding running time 초과지속시간, Ship response 선체응답, Long-term prediction 장기예측ABSTRACT: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 al gorithm of estimating statistically the time period that deck w etness will last on the deck of the ship. Deck wetness is one of the most important saf ety factors for sailing of a coaster. It generally means the si tuation in which the amplitude of the relative motion between the deck and the surfa ce 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 theor y. 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 f or planning the type of coaster sailing in the sea.교신저자 박종헌: 부산광역시 남구 신선로 179번지, 051-629-1655, parkjhss@tu.ac.kr