DESIGN AND S-LAY METHOD INSTALLATION ANALYSIS OF SUBSEA GAS PIPELINE IN KUALA TUNGKAL - PANARAN

• Main Author: Prasetyamulia R, M.Wahayu
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/86396
• Institution: Institut Teknologi Bandung

The transition to cleaner energy has begun in many developed countries. Natural gas is now increasingly used for electricity generation as an alternative to coal. Natural gas is considered cleaner because its combustion produces only one-tenth of the total emissions generated by coal combustion. Indonesia has abundant natural gas reserves, as its natural gas consumption is far lower than its production level. These abundant reserves are expected to benefit the country, one way being through natural gas exports. Natural gas export activities need to be supported by safe and efficient infrastructure. One such supporting infrastructure, which is considered safe, cost-effective, and efficient, is the subsea pipeline. Subsea pipelines are expected to support natural gas export activities, which will ultimately bring significant benefits to the country. In this final project, a 193 km subsea gas pipeline is planned to be laid from Kuala Tungkal to Panaran to transport natural gas to Singapore. The planning of the subsea pipeline installation involves several systematic design and analysis processes, adhering to applicable international standards, including environmental data processing, steel layer thickness analysis, on-bottom stability analysis, installation analysis, and free span analysis. Environmental data processing is conducted to obtain design environmental data values with specific return periods according to the planned pipeline location. The results of the environmental data processing are divided into five zones based on data similarities. The categorized environmental data will then serve as input for subsequent design and analysis. The steel layer thickness analysis is conducted according to DNV-ST-F101 and ASME B31.8 standards and is adjusted with the API 5L catalog. The steel layer thickness analysis results in a steel layer thickness of 12.7 mm. On-Bottom Stability analysis and concrete layer thickness design are performed according to DNV-RP-F109 standards. The stability analysis and concrete layer thickness design yield a concrete layer thickness of 40 mm. The installation analysis is conducted according to DNV-ST-F101 standards, resulting in the appropriate roller and stinger position configuration to prevent subsea pipeline failure during installation. The free span analysis, conducted according to DNV-RP-F105 standards, determines the allowable free span length in zone 1 as 15.8 m.