DNV Technology Services
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RISK-BASED APPROACHES ARE THE MOST EFFECTIVE AND TRANSPARENT WAY TO INCREASE TRUST AND CONFIDENCE IN NEW AND AGING FACILITIES.
ditions combined with a long tie-back distance made technology qualification vital for the operator. Finding new technological solutions to get the pipelines up the slide surface, DNV has developed project-specific free-span guidelines. Taking into account several vibration modes activated at the same time, laboratory tests were carried out, leading to greater understanding of the pipeline response and fatigue resistance. The research proved that pipelines are more robust than previously considered. The new free-span guidelines will be integrated into DNV’s Pipeline Rules in 2005. ASSET OPERATIONS ON THE BELANAK FIELD Located in the South China Sea, ConocoPhillips’ Belanak field facilities utilise one of the largest and most complex floating production, storage and offloading (FPSO) vessels ever built. Using DNV’s state-of-the-art risk-based maintenance methodology, Belanak’s inspection and maintenance concept has been developed. The scope of work included the FPSO, wellhead platforms and oil-offloading buoy. Developing the maintenance and inspection programme for the hull, structure and topside equipment, DNV’s advanced methodology for risk-based inspection and reliability-centred maintenance was combined with the ORBIT software. Due to the project complexity, different disciplines were involved: a risk-based inspection team for pressure systems, a riskbased inspection team for structure, and a reliability-centred maintenance team.
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The DNV project teams started from the Belanak operating philosophy and SHE policy, progressively working towards developing the inspection and maintenance strategies that finally translated into inspection and maintenance work packs that were uploaded into Belanak maintenance management system for implementation. OFFSHORE CLASSIFICATION OF PETROBRAS’ P-51 AND P-52 Being the largest semi-submersible offshore units to operate in Brazil, the Floating Production Units (FPU) P-51 and P-52 are considered a milestone in Brazil’s local shipbuilding history, due to Petrobras’ requirements regarding local content. Designed for operation at water depths of 1,225 and 1,800 metres, off the coast of Rio, the platforms will produce 180,000 bpd each. The whole P-51 unit, except for nodes, will be built in Brazil, while for P-52 the deck box and modules are being built in Brazil and the lower hull in Singapore. DNV in 2002 signed a verification contract for their front-end engineering design. Petrobras also chose DNV to classify the two FPUs with the additional class notation PROD, meaning that DNV also classifies the production plants. The classification work involves a design review, carried out at DNV’s headquarters, as well as fabrication surveys in four different sites, carried out from Brazil and Singapore simultaneously. Meeting customer demands, DNV has managed to cut the approval time significantly by using state-of-the-art IT and Nauticus in close cooperation with Keppel FELS in Singapore and Technip in Rio.