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Sources say Valero will upgrade its CDU at Port Arthur refinery, Texas, in February.

Valero Energy will upgrade its large crude distillation unit in Port Arthur's Texas refinery, which produces 380,000 barrels per day, in February, according to people familiar with plant operations.

Tuesday, a Valero spokesperson failed to respond to a question about the refinery’s maintenance schedule.

Valero will begin a series upgrades in February to the AVU 146 CDU to increase the unit's average capacity from 235,000 bpd up to 260,000 bpd.

Sources said that improvements would be made to the processing of bottoms, which are heavy, gunky residue crude oils usually sent to cokers or used to make asphalt.

Sources said that the refinery could keep AVU 146 running while upgrades are being carried out.

CDUs start the refining by converting crude oil to feedstocks that are used in all other refinery units.

Cokers can convert residual crude oil into motor fuels, or petroleum coke that can be used to replace coal.

Port Arthur is Valero’s largest refinery by capacity. (Reporting and editing by Erwin Seba, Chris Reese).

(source: Reuters)