Marathon assessing damage at Galveston Bay, Texas, Refinery, sources say

HOUSTON, June 20 (Reuters) - Marathon Petroleum MPC.N continued assessing damage on Friday to the shut residual hydrotreating unit (RHU) at its 631,000-barrel-per-day (bpd) Galveston Bay Refinery in Texas City, Texas, from a June 14 fire, said people familiar with plant operations.

The assessment began after the fire on the 64,000-bpd RHU was extinguished on the night of June 14, the sources said. How long the unit may remain shut was unknown.