Case Study: North Rankin B Pile Grouting

Case Study: North Rankin B Pile Grouting

The North Rankin B foundation houses one of the world’s largest topsides and is immense compared to a regular jacket. It is 150m tall, has four 22m2 mudmats, and stands in 125m of water. Because the grout volume was so large, FoundOcean used two of their unique Recirculating Jet Mixers (RJM) in unison to mix the material, and pump the grout down a single hose.

The seabed in Western Australia is particularly complex, with the structure requiring 16 foundation piles to secure it to the seabed. Each 182m-long pile was placed in two sections. The upper part of the hollow pile was driven as normal into the seabed. The ground below the pile was then drilled out to form a socket to enable the lower section of the pile to be inserted through the upper part.

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