By Erwin Seba
HOUSTON, Aug 13 (Reuters) - Shell SHEL.L shut the gasoline-producing resid catalytic cracking unit (RCCU) at its 231,827 barrel-per-day (bpd) Norco, Louisiana, refinery to begin a planned overhaul a month earlier than scheduled, people familiar with plant operations said on Wednesday.
A leak on a boiler feed water unit forced Shell to begin the planned overhaul on the 112,000 bpd RCCU immediately, the sources said. The overhaul was previously scheduled to begin on September 15 and last for about 50 days.
A Shell spokesperson did not reply to a request for comment on Wednesday night.
In addition to the RCCU, Shell plans to shut the 14,800-bpd alkylation unit. 40,000-bpd naphtha hydrotreating unit and the GO-1 ethylene unit.
The RCCU uses a catalyst under high heat and pressure to convert resid crude oil into unfinished gasoline.
Alkylation units convert refining byproducts into octane-boosting additives added to unfinished gasoline.
Hydrotreaters remove sulfur from motor fuels to comply with U.S. environmental rules.