HYDRAULIC ANALYSIS AND STRESS ANALYSIS OF GEOTHERMAL GATHERING SYSTEM

• Main Author: ARSHA (NIM : 13107040); Dosen Pembimbing : Prof. Dr. Ir. IGN Wiratmaja Puja, VIKRI
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/17504
• Institution: Institut Teknologi Bandung

Indonesia is a country that has a big amount of geothermal energy reserves which is about 27000 MWe. Until 2008, Indonesia has utilized geothermal energy at the rate of 1052 MWe. To increase the utilization of geothermal energy, a big plan was made to aim the utilization of geothermal energy at the rate of 25000 MWe by 2025. One way to achieve this target is to develop geothermal gathering system. <br /> <br /> <br /> In this final project, pipe hydraulic analysis, pipe sizing analysis, condensation rate calculation, corrosion potential analysis, material selection, and pipe stress analysis based on ASME B31.1 Power Piping have been conducted at Darajat geothermal field. <br /> <br /> <br /> From hydraulic analysis, based on diameter selection, it is found that the steam has fulfilled geothermal power plant minimum steam requirement with pressure of 14,91 barg and temperature of 206,1oC for Unit II as well with pressure of 16,44 barg and temperature of 208,4oC for Unit III. The selected pipe material is Carbon Steel API 5L with corrosion rate of 4 mpy. <br /> <br /> <br /> From the stress analysis, the system cannot resist stresses due to expansion, earthquake, and wind loads. Therefore, support gap modification and expansion loop addition are required. Based on parameter study in pipe stress analysis, failure will occur when wellhead moves 0,37 m downward or 0,33 m upward, the operating pressure exceeds 53,5 barg, earthquake load exceeds 0,31 g, wind velocity exceeds 250 km/h, and the absence of 12 pipe supports.