Pre and Post Seismic Assessment for an Onshore Oil and Gas Facility in Sabah

Abstract

Pre and post seismic assessment of an onshore oil and gas facility in Sabah examines the integrity and vulnerability of the assets against earthquake events. Due to the design requirements at the time of project inception, seismic considerations were not included. The necessity for this assessment arises from the heightened seismic activities in Sabah and nearby regions. Pre-seismic assessment evaluates the integrity of existing structures against seismic effects. This involves soil liquefaction susceptibility assessment and seismic reassessment of selected structures and equipment foundations. Post-seismic assessment identifies defects and seismic vulnerabilities in assets common to oil and gas facilities in accordance with established methodologies. For the pre-seismic assessment, one structure was found with a minor integrity concern, which calls for a more detailed analysis to determine the suitable solution, such as strengthening. As for the post-seismic assessment, some vulnerabilities were identified, and simple measures are recommended to eliminate these, such as providing more restraints to certain equipment. The outcomes of both assessments contribute to enhancing the seismic resilience of the facility, thereby mitigating potential risks from future seismic events while establishing best practices for this industry.