Pendekatan Empiris dalam Penentuan Pertambahan Berat Las Pada Blok 7 Lambung Kapal Ferry Ro-Ro 1500 GT

Abstract

A ship is designed to meet the requirements of the owner or mission authority, exhibiting specific functional characteristics, hull shape and strength, weight and space distribution, and certain technical and economic performance. Weight, hydrostatic, hydrodynamic, and structural analysis can obtain ship technical performance. Estimated ship weight must be as accurate as possible because it relates to some weight components and the location of the centre of gravity, both in the pre-design and final design stages. Inaccuracies and miscalculations will significantly affect the ship's carrying capacity, speed, stability, and safety. Reserve/Margin Weight is one component of the lightweight ship (LWT) intended to be added to the weight of other LWT components. The values vary at the initial design/ship design stage, about 1–2% for simple structures and 2–3% and 6% for more complex vessels. One component of this reserve weight is the weight of the weld on the ship's steel structure. This study uses an empirical approach to calculate the weld's additional weight to the ship's steel structure on block-7 of the Ferry Ro-Ro 1500 GT. The results showed that the weight of the welds on the steel structure block-7 was 734 kg, while the steel structure block-7's weight was 48595 kg. Hence, the additional weight of the weld to the block-7 structure was 1.5%.