| Title | Wayang Windu Geothermal Power Station – Reinstatement of Landslide Damaged Geothermal Fluid Supply Pipelines |
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| Authors | S. Banerjee, J. Cranston, W. Wirawan, D. Burns |
| Year | 2016 |
| Conference | New Zealand Geothermal Workshop |
| Keywords | Geothermal Power, Wayang Windu, Java, Indonesia, Landslide, Steamfield Pipeline Reinstatement |
| Abstract | Wayang Windu geothermal power station, located in hilly terrain about 40 km south of Bandung, West Java, Indonesia, delivers 227 MW of electricity into West Java transmission grid. On 5th May, 2015 a major landslide affected the area north of the power station. Multiple pipelines that convey geothermal two-phase fluids to the separator station were severely damaged, forcing shut-down of the power station. Following the immediate responsibility to address social and environmental disaster management concerns, the Power Station Owner initiated a project to safely reinstate the damaged pipelines and restart the power station. PT. Geotechnical Engineering Consultant (GEC) carried out a preliminary geotechnical assessment of the slide and an initial evaluation of the options for pipeline reinstatement. PT. Geoindo provided topographic and ground investigation (drilling) services. AECOM NZ provided engineering services for redesign of the pipelines, pipe supports and foundations, as well as geotechnical overview of ground investigations. Construction was carried out by PT.Cipta Bangun Nusantara (CBN). A critical project requirement was to provide a safe design that could be constructed speedily using available materials, in order to avoid the inherent delays in sourcing long-lead items. Accordingly, a 2-stage design and construction program was proposed. The aim of the initial stage (Stage-1) was to accomplish early reconstruction of part of the pipelines, utilising reclaimed materials from other (less critical) areas of the steamfield to enable the power station to restart as soon as possible, albeit at a reduced capacity. Full reconstruction using new materials was to be completed in Stage-2, to regain the full generation capacity. With meticulous planning and holistic project management, the Project Owner achieved the challenging milestones. The power station was restarted on 9th September, 2015 at 85% of full capacity and was back to 100% generation on 31st December, 2015. |