Applications - Underwater - Deep Sea (Case Study)
Anchoring of an offshore pipeline Protection structure (150m)
A total of 32 Platipus anchors were used to anchor down the pipeline tie-in protection structures at separate localities within the North Sea. (see Figure 1)
An ultimate load of 35kN was required for each anchor point and due to the differing nature of the geology at both sites, two anchor specifications were designed. At the first site in the southern sector, cohesive material was experienced and a B06TB anchor complete with 4m of 8mm stainless steel compacted strand wire tendon, 300mm x 300mm stainless steel load plate and wedge grip was installed. The non-cohesive material found at the northern sector resulted in a S08EB anchor configuration being used. Both types of anchor were installed at an angle of 25° to a depth of 3m. Each anchor was proof loaded to 35kN and locked on to the structure. (see Figure 2)
The anchors were installed 150m below sealevel using saturation divers. The installation equipment used included a multi-piece drive rod set driven by a heavy duty hydraulic breaker with quick release coupling hoses. Power to the equipment was supplied by a surface deepwater construction support vessel. The anchors were loadlocked using a Platipus hydraulic stressing kit specifically adapted for subsea use. The anchor specification had a design life of 100 years.
We have provided many solutions like this for the gas and oil industry in the North Sea and worked closely with Stena Seaway and Stolt Comex amongst other specialists.
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