HOUSTON, (Reuters) – Repairs at the crude distillation unit. Exxon Mobil (NYSE:) Corp’s 61,500 barrel-per-day (bpd) Billings, Montana, refinery are planned to continue for at least another three weeks, said sources familiar with plant operations.

According to sources, CDU shut down at 58,000 bpd after a fire on March 27, CDU performs the initial hydrocarbon breakdown and provides the feedstocks to all the other units of the refinery.