SUBSEA PIPELINE DESIGN AND CATHODIC PROTECTION ANALYSIS AT MADURA STRAIT

• Main Author: Nugroho, Luthfi
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/68047
• Institution: Institut Teknologi Bandung

Indonesia has abundant natural resources, one of which is oil and gas. The need for oil and natural gas is still the main fuel requirement for humans. Therefore, oil and gas exploration activities will continue to be carried out for the sake of human needs that must be met. One of the oil and natural gas exploration facilities is an underwater pipeline that functions as a means of transporting fluids from the offshore platform. Prior to the subsea pipeline construction process, the design and analysis of the subsea pipeline construction will be carried out. The first stage is pipe wall thickness analysis using the DNVGL-ST-F101 standard. This analysis includes the minimum thickness of the pipe wall thickness to withstand excessive internal pressure and local buckling pressure which includes system collapse pressure and propagation buckling pressure. Then choose the pipe wall thickness that meets the DNVGL-ST-F101 criteria. The next analysis is the pipe stability analysis using the DNVGL-RP-F109 standard and this analysis aims to determine the stability of the underwater pipe when subjected to environmental loads in lateral and vertical directions. The results of the stability analysis of the submarine pipeline are used for the analysis of the underwater pipeline installation. This analysis uses OFFPIPE and MOSES software, then the configuration of the roller, stinger, and tensioner along with the pipe tension during installation is obtained so that it does not exceed the allowable stress. The uneven contour of the seabed along with the continuous movement of the seabed makes the pipe not fully touch the seabed and free span occurs. This free span analysis uses the DNVGL-RP-F105 standard and the allowable free span length is obtained. Next is an analysis of the cathodic protection of submarine pipes using the DNVGL-RP-F102 and DNVGL-RP-B401 standards and the value of the distance between the anodes is 300 meters, the number of anodes is 36, and the anode mass is 876.97 kg.