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ExxonMobil Chemical Plant (286), Baton Rouge

Releases of Nitrogen Dioxide

LDEQ Accident Number
Accident Date
Point Source(s) Notes Amount of Release


Followup: No

Notes: They had a leak on a pump. When they isolated that leak, they weren't using the pump so sent to flare. They expected to exceed RQ. They were trying to fix the leak. Just SPOC report.

Cause: Compressor tripped off.

Followup: No

Notes: It was diverted to secure and took it out of the flare.
7.0 pounds

Baton Rouge Turbine Generator exhaust stack S-85

Followup: No

Notes: On 1/29/06 the BRTG unit was started up after turnaround. A fuel gas meter had been blocked in for recalibration during the turnaround. This meter is used to calculate the proper amount of nitrogen oxide suppression stream. After startup, this meter remained blocked in and was providing erroneous data to the controller, which resulted in the improper amount of nitrogen oxide suppression steam being supplied. This led to a permit deviation on the 25 PPM limit for the gas turbine generator, a regulatory deviation for the meter being unavailable, and the exceedence of RQs for nitrogen oxide and nitrogen dioxide. The flow meter unblocked and was returned to service. The report said that the incident was under investigation. Procedures would be modified as applicable.
81.0 pounds

Storage Tank
Advanced Wastewater Treatment Unit
Cause: BRCP Flaring During Shutdown: On September 1, the Baton Rouge Chemical Plant began to safely shutdown operations due to power failures associated with Hurricane Gustav. During shutdown, excess gases were vented to the flare system in order to reduce emissions to the atmosphere. Baton Rouge Turbine Generator NOx steam trip: ExxonMobil experienced difficulty providing NOx suppression steam for our BRTG. Condensate is required to desuperheat the NOx suppression steam prior to using it in the BRTG. The normal condensate supply from operating units to provide desuperheater water is unavailable as these units are down. Temporary demin trailers were used to help provide an interim source of condensate to mitigate the loss of NOx suppression steam, but were unable to continuously supply the condensate for NOx steam to BRTG. Nitrogen blanketing for tanks on vapor recovery: The lack of nitrogen availability has also created a temporary loss of nitrogen blanketing for storage tanks on vapor recovery. Loss of nitrogen blanketing means that air will be pulled into the tank which is unacceptable from a hazard risk standpoint. The tanks without nitrogen blanketing must be blocked away from vapor recovery because it is unsafe to vent oxygen to a fuel gas or flare gas system due to the potential of creating an explosive mixture. Exxon shut down the vapor recovery controls when the site lost nitrogen. Once nitrogen is restored, Exxon will restart vapor recovery systems. Once normal operations are resumed, Exxon will report total excess emissions and duration of vapor recovery outages for affected tanks. Two hatches found open: Two tank hatches were found open after the hurricane was over. These tank hatches were blown open when wind speeds were highest (>90 mph) during the hurricane. Tank hatches must remain closed to prevent emissions; as such, these incidents are considered bypassing of a control device. The estimated emissions from these open tank hatches are below RQ amounts. AWT overflow to Monte Sano Bayou: The separator at the Advanced Wastewater Treatment unit overflowed to the Monte Sano Bayou. The incident occurred when the pumps lost power and could not pump down the level in the separator. Approximately 1300 gallons of untreated wastewater was discharged in to the bayou. Power to the pumps was restored and the level in the separator was pumped down to stop the overflow to the bayou. The composition of the discharged wastewater is unknown at this time due to a disruption in laboratory samples as a result of the hurricane.

Followup: Yes

Notes: BRCP was shutdown due to hurricane Gustav.
149.1 pounds