The Onsan refinery is South Korea’s premier refining facility and a major contributor to the country’s thriving economy. With the aim to increase output, SOIL was looking to expand the refinery. A joint venture lead by Daelim was engaged to construct a Residue Upgrading Complex (RUC). The new facility would convert low value residue into high value products such as gasoline and olefin downstream products.

As part of the construction of the RUC, three columns needed to be lifted into an upright position. The challenge posed was that the columns weighed up to 2000 tons each and had to be lifted within the confined space of the refinery. The initial plan to use a gantry system was projected to take three months to complete because of the need to relocate it for each lift. So Mammoet came up with an alternative solution.

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