DESIGN AND RISK ASSESSMENT OF SUBSEA PIPELINE IN MADURA STRAIT

• Main Author: Cita Logika, Dinda
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/71308
• Institution: Institut Teknologi Bandung

The need for gas and oil continues to increase along with the progressing times. Subsea pipeline systems in gas and oil distribution are considered to be more effective and economically better than other distribution methods. The subsea pipeline must be designed to be potent enough, safe and economical so that the distribution of gas and oil can be guaranteed and effective. The design process needs to be carried out in operating, hydrotest, and installation conditions with pipelinr wall thickness design using DNV-OS-F101 standard, stability design on the seabed using DNV-RP-F109 standard, installation analysis based on DNV 1981, and free span design using DNV-RP-F105 standard. After that, pipeline risk analysis because of failures that may occur in the due to accidental external loads is carried out using the DNVGL-RP-F107 and DNV-RP-F111 standards. In this Final Project, it is obtained that the wall thickness of the conduit pipe to be used is 12.7 mm (0.5 in), the thickness of the concrete layer is 40 mm (1.5748 in). Then, the allowable free span legth of the pipeline is 16.15 m. In risk analysis, the risk level of subsea pipeline failures due to dropped anchors, dragged anchors, and vessel sinking is found to be in the acceptable and ALARP areas with low probability (rank 1) and various consequences (ranks 1 to 4). Further analysis is needed for mitigation and countermeasures in the ALARP area.