Port Arthur refinery explosion

 Due in large part to staffing limitations, the CSB did not deploy investigators to  23 significant chemical accidents last year:

An example of one such incident: 

The  November 8, 2007, Refinery Explosion and Fire: A desulfurization unit fire at a Port
Arthur, Texas, refinery was caused by an ignition in the furnace. Because of the
explosion and fire, the refinery was operating at approximately 60 percent of capacity, or 165,000 barrels of crude processing compared with normal daily capacity of 265,000
barrels.