ROUTE SELECTION AND CONCEPTUAL DESIGN OF BATUI - BAHODOPI LIQUIFIED NATURAL GAS PIPELINE

• Main Author: Ariq Rizqullah, Irfan
• Format: Final Project
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/77200
• Institution: Institut Teknologi Bandung

The Ministry of Energy and Mineral Resources of the Republic of Indonesia states that Indonesia has a high dependency on fossil energy and coal, accounting for 68% of its primary energy supply. The National Energy Policy (KEN) and the Paris Agreement encourage the reduction of fossil energy usage, implementation of renewable energy, and greenhouse gas emissions reduction. In support of these goals, Indonesia possesses natural gas reserves distributed across the country. Particularly in Sulawesi, there is a natural gas reserve of approximately 3.93 trillion standard cubic feet (TSCF). The construction plan of the Combined Cycle Power Plant (PLTG) in Bahodopi, Central Sulawesi requires a safe and stable supply of Liquified Natural Gas (LNG), necessitating the establishment of a transmission pipeline for the optimal operation of the power plant. The transmission pipeline is planned to connect Bahodopi with the nearest LNG facility located in Batui. The selection of the pipeline route involves an analysis aimed at minimizing cost and construction time risks. Alternative pipeline routes are chosen based on a scoring matrix that takes into account physical, geopolitical, and cost factors. The pipeline design is carried out using data and conditions that correspond to the selected route. The pipeline design adheres to DNVGL-ST-F101 and ASME B31.4 standards for determining pipeline wall thickness, DNV-RP-F109 for determining the thickness of concrete weight coating to ensure on-bottom stability, DNVGL-STF101 for checking pipeline installation stress, and DNVGL-RP-F105 for screening fatigue and ultimate limit state (ULS) due to free spans. Based on the planning and design process of this study, a hybrid pipeline route is selected, comprising onshore and offshore pipeline segments. The obtained pipeline wall thickness is 10.3 mm for the onshore segment and 14.3 mm for the offshore segment. The pipeline achieves absolute stability with a 40 mm thick concrete weight coating and a trench depth of 0.04 m at a 45° angle. The pipeline installation at a maximum depth of 115 m meets the stress criteria. The free span length that satisfies the screening fatigue and ULS is 14.4 m.