Houston Refining LLP, a division of LyondellBasell, on June 14, shut down the 57,000-barrel-per-day (BBL/d) Delayed Coker 737 at its 268,000-BBL/d refinery in Houston, Texas, due to a small fire at one of the unit's two heaters. The cause is under investigation, and plant personnel hope to have the unit back online by June 16.