SEMI QUANTITATIVE RISK ASSESSMENT AND REMAINING STRENGTH ANALYSIS FOR CORRODED OFFSHORE PIPELINE

• Main Author: DEWABRATA (NIM : 23109029); Dosen Pembimbing : Prof. Dr. Ir. IGN Wiratmaja Puja, FADHIL
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/15589
• Institution: Institut Teknologi Bandung

The progress of the offshore pipeline technology can’t be separated from the increasing world demand for energy of oil and gas. High production costs and high risks require the development and maintenance of offshore pipelines more effectively. In the operation of the offshore pipeline, the environmental conditions of uncertainty and corrosion are a major cause of pipeline degradation. Use of pipeline risk assessment and remaining strength analysis is needed in assessing the integrity of a pipeline with the aim of evaluating the threat and identify effective ways to manage these risks. In this thesis, semi quantitative risk assessment of offshore pipelines based on index method developed by Muhlbauer. To simplify the analysis program was developed to help with the calculation method. As a case study, two pipeline risk analysis contained in the installation of pipeline Offshore North West Java. Segmentation of each pipeline is based on the change of pipeline condition, which is based on design data, operations, environmental, pipeline anomaly and degradation data. After that also performed the calculation of remaining strength analysis at locations that are considered critical, based on the Recommended Practice DNV-RP-F101 Corroded Pipelines. The results for the pipeline MMF-NGLJ MOL was 104 segments included in the medium risk and 3 segments included in the medium-high risk. While the analysis of residual strength shows at 10 point pipeline is considered unsafe and should be repaired immediately. For the pipeline PCP MGL-MK is 50 segments included in the medium risk and 3 segments included in the medium-high risk. While the analysis of residual strength shows at 10 points is considered safe pipeline, but after 9 years of corrosion rate assessed will be the threat of a leak in the pipeline.