Due to increasing demand of the port activity it requires rapid operations of ship assisting and tug. Complex operations combined with challenging environmental disturbance often lead to ship accident that caused damaged to the jetty or the ship itself that also disrupt the overall port operation. On of the cause that lead such accidents is the limited capability of the tugboat to handle manoeuvre in extreme environment condition. Beside the safety of the operation are threatened this is also one factor that lead to decreased in tug operation effectiveness. This study intent to analyse the potential of dynamic positioning (DP) system used in the tugboat. Port of Cilacap used as study case due to special requirement as well as challenging location that lead in extreme condition of port operation. Two type of propulsion are used which is Azimuth and Void-Schneider propulsion. The conceptual system design is analysed by perform modelling simulation in Matlab software. Several condition of operation among the type of propulsion are assessed. The result is that DP system on tugboat could reduce the potential uncontrolled movement of the ship that lead to the accident. The analysis also proved that DP system of the ship can increase effectiveness of the operations by reducing the response time during manoeuvring.
Floating storage and offloading (FSO) is an important vessel in offshore as shuttle storage of crude oil before it will transfer to the onshore facility located near the drilling platform. One of the locations that use FSO is Poleng Field in West Madura Offshore by operating FSO Abherka. Poleng field is supplying for two regions in Java and Kalimantan, it can affect the energy supply of the regions if there is an accident. The possible accident is a ship collision with FSO Abherka in addition the location is near Surabaya West Access Channel (SWAC). It is necessary to conduct a risk assessment of ship collisions on FSO Abherka and a consequences analysis of oil spills due to structural damage. Calculating ship collision frequency using CRASH method using two traffic scenarios found the result of ship collision frequency for external and internal powered collision: 4,20E-03 and 1,28E-03, and external and internal drifting collision: 4,51E-03 and 4,01E-03. Consequences of Collision simulation is conducted in three variations of collision scenario and impacting to the hull damage. Total asset & equipment loss due to collision in various degree of 30°, 60°, and 60° as follows: $23.462.196,03, $23.666.532,98, and $23.921.683,88. Those total asset & equipment loss and environmental impact from the oil spill is on the category of unacceptable. Applying a traffic monitoring system is effective to reduce the frequencies by about 71-93%.
The growth of the energy industry in Indonesia is increasing rapidly. This study concern about the crude and product oil distribution of one of the biggest oil companies in Indonesia. The distribution of crude and product oil requires large capacity particularly designed bunker transportation, which is an oil tanker. However, the enormous size of the tanker causes the tanker must be assisted by a tugboat to berth at the port of any type of waters. In this study, the simulations were conducted at the Marine Region (MR) III of Tanjung Priok Port, which has a basin-shaped berthing area, to determine the needs of tugboats force based on the size of the tankers. The simulations were carried out in MATLAB software by considering Tankers’ principal dimension, environmental data, Tugboat force (Bollard Pull; BP), and Tugboat’s heading angle. Then, those forces should be combined with each other into several scenarios and reviewed its economics based on the “buy”, “lease”, and “combination” scenario, calculated in the Capital Expenditure and Operational Expenditure factors.
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