BP's Whiting, Indiana refinery to shut large CDU for up to 10 days - sources

(Adds details on CDU outage, company no comment)

HOUSTON, Sept 16 (Reuters) - BP Plc plans to shut the large crude distillation unit for up to 10 days of repairs at the company's 413,500 barrel per day (bpd) Whiting, Indiana refinery, Midwest trade sources said on Friday.

A BP spokesman declined to discuss operations on Friday at the Whiting refinery.

Repairs on the 290,000 bpd CDU, called Pipestill 12, are expected to begin early next week, coinciding with the planned shutdown of a smaller crude unit and the refinery's gasoline-producing fluidic catalytic cracking unit, sources have told Reuters.

Sources familiar with plant operations said on Friday they understood Pipestill 12 would only be partially shut, reducing the unit's production by up to 50 percent.

If Pipestill 12 is only partially shut, the repairs may take a month to complete, the sources familiar with operations said on Thursday.

The planned overhaul on the refinery's 90,000 bpd Pipestill 11C crude unit is planned to run until early November as is the overhaul on the 110,000 bpd FCCU 500.

Whiting's 75,000 Pipestill 11A CDU and the 60,000 bpd FCCU 600 will remain in production during the work.

The repairs on Pipestill 12 are expected to focus on the unit's pumps, which have been prone to plugging up the pump, the sources said.

CDUs do the initial refining of crude oil coming into a refinery and produce feedstock for all other units. (Reporting by Devika Krishna Kumar and Scott DiSavino in New (KOSDAQ: 160550.KQ - news) York; Erwin Seba in Houston; Editing by Diane Craft)