(Bloomberg) -- Shell Plc will take key processing units offline, as part of major maintenance that’s due to start at Europe’s biggest oil refinery in the coming days.

Work at Pernis in Rotterdam will include two so-called high-vacuum units, according to a person familiar with the plans. These produce feedstock for units including the hydrocracker and fluid catalytic cracker, which make diesel and gasoline.

Read more on Shell’s plans at Europe’s biggest oil refinery 

The work not only could clash with disruption in fuels output at BP Plc’s Rotterdam plant, Europe’s second-biggest refinery, but coincides with rising margins for diesel and gasoline in northwest Europe, the oil-trading hub where Pernis is located.

This round of maintenance at Pernis, which can process about 400,000 barrels of crude oil a day, is the biggest in at least two years. The work at the complex, now also known as the Rotterdam Energy and Chemicals Park, will last until June, according to a Shell statement last week, which lacked any specifics on the plants affected. The company will work on the Moerdijk chemicals plant, which is integrated with the refinery, toward the end of the period, the person familiar said. 


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