A Study on the Stability of a Low Freeboard Coastwise Tanker Capsized in Turning (2) -Experimental Examination of the Outward Heel Moment Induced by Flooding of Seawater onto the Deck-

Lee, Yun-Sok; Kim, Chol-Seong; Lee, Sang-Min

Journal of Navigation and Port Research 2003;27(5):465-471.
Published online December 31, 2003.

선회중 전복한 저건현 내항 탱커의 복원성에 관한 연구 (2)

이윤석, 김철승, 이상민

A Study on the Stability of a Low Freeboard Coastwise Tanker Capsized in Turning (2) -Experimental Examination of the Outward Heel Moment Induced by Flooding of Seawater onto the Deck-

Yun-Sok Lee, Chol-Seong Kim, Sang-Min Lee

Abstract

A coastwise chemical tanker sailing at full speed has capsized during turning in calm water. In the previous paper, we investigated the reasons of the accident by demonstrating the proper correction for the free surface effect of the liquid cargo and the bow-sinkage effect. In this paper, we also carry out model experiments of a transverse pressure under the seawater and an outward heel moment according to the heel angle and rudder angle, on the basis of radius of turning circle, ship’s speed and drift angle of model ship occurring in turning. It is also shown that the flooding of seawater onto the deck occurring in turning generated a significant outward heel moment and increased the vertical distance between the center of gravity of the ship and the center of lateral water drag.

Key Words: coastwise tanker;radius of turning circle;transverse pressure;heel moment;flooding of seawater