The South Sumatra Gas Pipeline has a total length of 250 km and varies in pipe size. It delivers 250 MMSCFD gas from scattered gas fields to gas markets in Palembang, the industrial center in South Sumatra. The 16-inch Rambutan-Betung segment has ruptured three times. Based on these failures a maintenance program was conducted to avoid similar problems in other segments. These programs were accelerated inline inspection, rupture investigation using Fault Tree Analysis (FTA) method, failure analysis and evaluation of risk assessment methods. The evaluation of risk assessment methods addresses the following considerations: Is the risk assessment method that has been used applicable? Which risk assessment method is more accurate? What actions are necessary to improve risk assessment in the future? Risk assessment methods by AGA PIMAR (American Gas Association Methods for Prioritizing Pipeline Maintenance And Rehabilitation) and Kent. W Muhlbauer method were evaluated and compared. The evaluation was applied based on five conditions. These conditions are before failure/rupture, after rupture, after intelligent pigging, after failure analysis and condition before failures but having high potential land movement. The last condition was included because the failure analysis indicated that ruptured was caused by land movement (land slide). The risk assessment evaluation indicated that each of the assessment methods used was applicable and accurate for different pipeline conditions. For the South Sumatra Gas Pipeline AGA PIMAR was found to be more suitable for the segments evaluated. This evaluation concludes that there is no exact method for implementation of risk assessment; engineering judgment is required in the process.

This content is only available via PDF.
You do not currently have access to this content.