Technical Evaluation of The Suitability of Engines as The Main Mover of Purse Seine Vessels Based on The Holtrop Method of Resistance Calculation

Abstract

The compatibility between the main engine and the vessel's power requirements is a crucial factor in achieving efficient and economical fishing operations. This study aims to analyze the compatibility between the installed (existing) engine power and the ideal engine power requirements (BHP) on a 30 GT purse seine fishing vessel operating in Sendang Biru Harbor. The research method used is a case study with data collection of the vessel's main dimensions through direct measurements in the field. The power requirement analysis was carried out based on the Principles of Naval Architecture (PNA, Vol. II) standard using the Holtrop method to calculate the vessel's total resistance (RT). From the calculation results, the total resistance (RT) value was obtained at 21,300 kN. Based on this resistance value, the effective power required by the vessel is 104,279 HP. By taking into account propulsion efficiency, the Delivery Horse Power (DHP) requirement is obtained at 216 HP. The final Brake Horse Power (BHP) calculation was carried out by adding a correction to the engine room location (3%) and a correction to the shipping route or service margin (15%). The calculation results show that the ideal engine power (BHP) requirement for the vessel is 255.36 HP (187.82 kW). Currently, the vessel is using a Nissan Diesel RF8 engine (V8, 7.79 liters) which has a maximum installed power of 190 HP (140 kW). The comparison results show a power difference, where the installed engine is 190 HP or 25.6% lower than the vessel's ideal requirement (255.36 HP). This finding indicates that the vessel is underpowered, which can potentially cause fuel inefficiency, over-stress on the engine, and failure to achieve optimal service speed