Detailed Geological Assessment at KP220 of SSGP
In November 2021, a pipeline dig-up activity revealed a pipeline parting at KP220 of the Sabah–Sarawak Gas Pipeline (SSGP) right-of-way, suspected to be caused by geohazard. Geotechnica Sdn Bhd, in association with Wan Husin & Associates Sdn Bhd, was appointed to perform a geological assessment and recommend mitigation action for PETRONAS Carigali Sdn Bhd and WHA Sdn Bhd.
CLIENT
YEAR
PETRONAS Carigali Sdn Bhd / WHA Sdn Bhd
2022
Project Overview
Scope, conditions & requirements
Project Scope
Geological assessment of a pipeline parting incident at KP220 along the SSGP right-of-way, to determine the cause and recommend mitigation action.
Site Conditions
Field assessment showed high deformation and active slope movement, with signs of distress including faults, buckling, boudinage, tension cracks and water seepage.
Investigation Requirements
Kinematic analysis and XRD testing were required to identify the failure mechanism and characterise the extent of weathering and deformation at the site.
Our Approach
How the incident was assessed
Field Assessment
Site inspection identifying geological structures and distress indicators — fault, buckling, boudinage, tension cracks and water seepage — along the affected corridor.
Kinematic Analysis
Assessed potential failure modes at the site, identifying sliding, wedge and toppling failure as credible mechanisms.
XRD Testing
Mineralogical testing of site material to characterise the extent of weathering and deformation.
Key Findings
What the assessment showed
Finding 1
Kinematic analysis and XRD testing identified potential sliding, wedge and toppling failure mechanisms at the site.
Finding 2
Testing revealed intense weathering and deformation consistent with the active ground movement observed in the field.
Project Outcomes
How the findings are used
Immediate and permanent remedial works were recommended to prevent further deterioration at KP220 — giving PETRONAS Carigali and WHA Sdn Bhd a clear mitigation pathway to restore and protect pipeline integrity following the parting incident.