Calumet Specialty Products Partners has signed a definitive agreement with Murphy Oil to acquire the Superior refinery in Wisconsin, US, and its associated operating assets and inventories for $475m.
The Superior refinery produces petrol, distillate, asphalt and petroleum products that are marketed in the US Midwest and Canada.
The other operating assets include inventories valued at $260m and various owned and leased finished product terminals.
Calumet Specialty Products Partners' vice-chairman and CEO Bill Grube said that the acquired assets will increase the firm's throughput capacity by 50% to 135,000 barrels per day and will add beneficial geographical diversity to the assets.