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ExxonMobil Chemical Plant (286), Baton Rouge

Releases of T-butene2

LDEQ Accident Number
Accident Date
Point Source(s) Notes Amount of Release
107433

2008-07-22

H furnace
Cause: Three events occurred within 24 hours of one another at the ExxonMobil Baton Rouge Chemical Plant. Two are reported in this report (LDEQ #107433), the other is reported separately (LDEQ #107421). In this incident (107433), a furnace tube leaked into convection section of H-furnace and caught fire. The tube leak occurred as a result of the incident described in report #107421. At approximately 5:56 PM on July 21, 2008, the charge gas compressor at the Olefins unit shut down when several processing cards in the gas turbine control system failed. When the compressor shut down, four furnaces automatically shut down and the gas in the furnaces was evacuated to the flare system. One of the remaining three furnaces was subsequently shut down while the remaining two furnaces continued to operated at 50% rates in order to maintain stable unit operations, which resulted in additional flaring for the duration of the event. The high rate of gas to the flare system resulted in the #25 flare smoking for 2 hours and 17 minutes. When the Olefins unit shut down, steam was introduced into the furnaces to displace the hydrocarbon feed to reduce flaring emissions. At 12:20 PM on July 22, 2008, while the H furnace was in the process of starting up, a leak was discovered in the convection section of the furnace. To stop the leak, water was introduced into the leaking pass of the furnace to displace the hydrocarbon feed. It is believed that the leak developed when steam was introduced into the furnace. Tube leaked into convection section of H-furnace and caught fire.

Followup: Yes

Notes: This incident is the result of the incident #107421 (see comments under that incident). Immediately after the incident began, five of the seven furnaces at the Olefins unit were shut down. Excess gas was sent to flare system. Water was introduced into the leaking furnace pass to displace the feed and prevent uncombusted hydrocarbons from leaking into the atmosphere. Concerning subsequent preventative actions, the failed processing cards were replaced. The H furnace was taken out of service to be inspected for leak location and repairs will be completed as necessary. Used water in the tube to eliminate the burning material. Flammable gass consisted of mainly Butane.
30.0 pounds
112825

2009-02-17
EPLA-W Compressor, flares #10, 25, and 26
Flares #10, 25, and 26
Cause: A fire resulted in a compressor shut down and material being flared from 10:30 pm - 11 pm. Around 10:30 pm the charge gas compressor (EPLA-W compressor) for the Olefins Maintrain furnaces tripped due to failed overspeed wiring. This occurred because of a small leak of lube oil from the steam driver which caught fire. This fire was small but close to the wiring which malfunctioned.

Followup: No

Notes: This incident is linked to incident #112824. The effluent gases were diverted to flares before the compressor could be repaired. Start up began around 8:45 pm on 2/18/09. Flaring during shut down through start up resulted in exceedances of RQs for ethylene, propylene, butadiene, nitric oxide, and sulfur dioxide. Also they had three compliance excursions from smoking of flares #10, #25, and #26. This was a non preventable incident from a malfunction. They are looking into preventing lube oil leaking and collecting near compressor wiring.
100.0 pounds
135246

2011-11-11
KD-14 charge gas drier bypass line
Cause: A line leak was discovered on the KD-14 charge gas dier bypass line. 107 lbs of charge gas was released as a result of a line leak on the KD-14 charge gas drier bypass line.

Followup: No

Notes: Area monitoring was conducted and monitoring results repeatedly indicated low levels of hydrocarbon present at the leak site but at concentrations below the limit of detection at the BRCP fence line. A clamp has been placed on the line to isolate the leak. Prior to the permanent clamp being installed, a temporary clamp was installed on the line. Area monitoring was conducted. A permanent clamp was installed on the line on November 11.
1.0 pounds
135181

2011-11-09
compressor KC-01
Cause: A combination release occurred due to a cracked pipe in the thermo well of the ethylene production unit.

Followup: Yes

Notes: An engineered clamp is being fabricated and will be installed to isolate the leak. Estimated 72 hours to install clamp and secure leak. Individually this event did not exceed the RQ for HRVOC, but in combination with another incident (#11-07037) the RQ for HRVOC was exceeded on Friday, November 11. Approximately 122 pounds of HRVOC's were released. On November 11, 2011 at approximately 13:51 Derek Reese stated the ongoing release subsided to 4.25 lbs/hr and was now below RQ. (still ongoing on report date 11/16/11) Area monitoring and LDEQ monitoring on the fenceline (including grab sample) did not detect anything. LDEQ did pick up .25ppb of Benzene. A total of 108 pounds per day of charge gas is being released as a result of this event. Cumulative emissions which include the total emissions from the incident and complete response, will be included in the follow-up report.
169.0 pounds
147797

2013-04-02

seal on unit pump, EFP-60A
Cause: On April 2, 2013 the Neo Acids unit pump, EFP-60A, seal developed a leak releasing approximately 50 gallons of therminol to the sewer. Of which approximately 110 pounds were biphenyl.

Followup: No

Notes: All of the material released remained in the liquid phase and no evaporation of the material occurred. After further evaluation, it was determined that no reportable quantities were exceeded.