SUBSEA PIPELINE DESIGN AND THERMAL EXPANSION ANALYSIS AT MADURA STRAIT

• Main Author: Vergus Sullivan, Bryan
• Format: Final Project
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/78274
• Institution: Institut Teknologi Bandung

This final project takes an in-depth look at the design and analysis of subsea pipelines in the Madura Strait, with depths of up to 65 meters and a total pipeline length of 28,303 kilometers. Indonesia, as one of the world's largest oil and gas producers, continues to face huge growth in energy demand. In this context, subsea pipelines play a very important role in the energy transportation system, and this study aims to design an optimal pipeline system according to the geographical and environmental characteristics of the Madura Strait. The pipeline system design process involves a series of steps that include environmental data processing, pipe wall thickness analysis, on bottom stability analysis, installation analysis, free span analysis, and an in-depth understanding of thermal expansion and virtual anchor points through thermal expansion analysis. Data such as the significant wave height, its wave crisis period, the current velocity at 90% water depth, and the maximum and minimum wave heights at 1-year, 10-year, and 100-year periods, were evaluated using the Kolmogorov-Smirnov distribution test. In the pipe wall thickness analysis, a minimum subsea pipe wall thickness value of 14.3 mm was obtained. The results of the on bottom stability analysis concluded that a concrete layer with a minimum thickness of 40 mm and the use of trenching with an angle of 45° and a zone 3 depth of approximately 0.274 meters were the most suitable options. In the installation analysis, a suitable configuration has been obtained in the dynamic installation of pipes at a minimum water depth of 20 meters to a maximum water depth of 65 meters. In addition, in the free span analysis, the maximum permissible lengths in zones 1 to 3 are 17.61 meters, 16.67 meters, and 13.84 meters, while the thermal expansion from zones 1 and zones 2 is about 0.203 meters and 0.202 meters. The results of this study have significant implications for supporting the sustainability and reliability of the energy transportation system in the Madura Strait region to meet the increasing energy needs in Indonesia.