Royal Dutch Shell PLC is preparing to shut down a catalytic reforming unit at its Deer Park refinery to make repairs on a leaky valve. 
The refinery said a leaky valve sprung Wednesday November 30 in its catalytic reforming unit 3, causing emissions that continued into Thursday, according to a statement made to the Texas Commission on Environmental Quality.
The length of time needed to repair the leak is not known.
The Deer Park refinery is a 50-50 joint venture between Shell and Mexico’s national oil company Petroleos Mexicanos and has a crude-oil capacity of about 340,000 barrels a day.
Source: Nasdaq.com, “Shell to Shut Unit at Deer Park Refinery,” by Dan Molinski, December 1, 2016