JOURNAL BROWSE
Search
Advanced SearchSearch Tips
Estimation of Optimum Tug Capacity for VLCC and Its Application to VLCC Terminal in Gwang-Yang Harbor
facebook(new window)  Pirnt(new window) E-mail(new window) Excel Download
 Title & Authors
Estimation of Optimum Tug Capacity for VLCC and Its Application to VLCC Terminal in Gwang-Yang Harbor
Gong, In-Young; Lee, Chang-Min; Yang, Chan-Su; Lee, Han-Jin;
  PDF(new window)
 Abstract
The total tug capacity needed for berthing/unberthing operations of a ship may vary depending on the ship`s type, size, loading conditions, and environmental circumstances. Traditionally, total tug capacity is determined based on the local guidelines of port authorities or on the rule of thumb. However, the social demands for the enhancement of ship safety at harbor and the economical demands for the cost-effectiveness of tug usage makes it necessary for port authorities to develop more reasonable and detailed guidelines on tug usage which takes various conditions into account. In this paper, the method to estimate the optimum tug capacity of VLCC is suggested by considering various ship conditions such as its size, loading conditions, and environmental circumstances including wind, wave, tidal currents, and geographical characteristics of a terminal. This method is applied to the VLCC terminal located in Gwang-Yang harbor of Korea and the results are compared with the local guidelines of the harbor, which shows that there may be a room for the amendment of local guidelines on tug usage.
 Keywords
Tug Capacity;VLCC;VLCC Terminal;Gwang-Yang Harbor;Tug Usage Guideline;
 Language
English
 Cited by
 References
1.
OCIMF, 'Prediction of Wind and Current Loads on VLCCs', Witherby & Co. Ltd. London England 2nd Edition, 1994

2.
Henk Hensen, 'Tug Use in Port', The Nautical Institute, 1997

3.
Yasuo Yoshimura, "Mathematical Model for the Maneuvering Ship Motion in Shallow Water(2nd Report) Mathematical Model at Slow Forward Speed (In Japanese), Vol. 210, Journal of Kansai Society of Naval Architecture of Japan, 1988

4.
Yeosu/Gwang-Yang Local Guidelines on Tug Usage, Notification of Yeosu Regional Maritime Affairs and Fisheries Office, No. 01-67, Amended on Dec. 1, 2001

5.
Yeosu/Gwang-Yang Tug Status Report, Homepage of Yeosu Regional Maritime Affairs and Fisheries Office (http//yesou.momaf.go.kr ), Jun. 2004