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ExxonMobil Chemical Plant (286), Baton Rouge

LDEQ Accident Report

Accident #135181
State Police #11-06997
Accident Date2011-11-09
Report Date 2011-11-16
Follow-up Date 0000-00-00
Follow-up: Yes

Pollutants Released

Pollutant Duration Point Source Greenhouse Gas Criteria Pollutant Ozone forming chemical Amount of Release
Hydrogen168 hrscompressor KC-01NONONO492.0 pounds
Carbon Monoxide168 hrscompressor KC-01NOYESNO13.0 pounds
Hydrogen Sulfide168 hrscompressor KC-01NONONO24.0 pounds
Methane168 hrscompressor KC-01YESNOYES2,564.0 pounds
Acetylene168 hrscompressor KC-01NONONO140.0 pounds
Ethylene168 hrscompressor KC-01NONOYES7,951.0 pounds
Ethane168 hrscompressor KC-01NONOYES2,609.0 pounds
Methyl Acetylene168 hrscompressor KC-01NONONO180.0 pounds
Propylene168 hrscompressor KC-01NONOYES2,422.0 pounds
Propane168 hrscompressor KC-01NONOYES163.0 pounds
T-butene2168 hrscompressor KC-01NONONO169.0 pounds
1,3-Butadiene168 hrscompressor KC-01NONOYES530.0 pounds
Isobutylene168 hrscompressor KC-01NONOYES347.0 pounds
Butane168 hrscompressor KC-01NONOYES47.0 pounds
Isobutane168 hrscompressor KC-01NONOYES4.0 pounds
Cyclopentadiene168 hrscompressor KC-01NONONO27.0 pounds
Pentadiene168 hrscompressor KC-01NONONO16.0 pounds
Isoprene168 hrscompressor KC-01NONOYES38.0 pounds
Pentene168 hrscompressor KC-01NONONO38.0 pounds
3-Methyl-1-Butene168 hrscompressor KC-01NONOYES29.0 pounds
Isopentane168 hrscompressor KC-01NONOYES24.0 pounds
Benzene168 hrscompressor KC-01NONOYES138.0 pounds
Toluenecompressor KC-01NONONO60.0 pounds
Volatile Organic Compounds (VOCs)168 hrscompressor KC-01NONOYES58.0 pounds
Water168 hrscompressor KC-01NONONO56.0 pounds
Highly Reactive Volatile Organic Compounds168 hrsCompressor KC-01NONOYES122.0 pounds
Carbon Dioxide168 hrsCompressor KC-01YESNONO7.0 pounds

Accident Classified As: Reportable Quantity

Cause of Problem: Piping or Tubing

A combination release occurred due to a cracked pipe in the thermo well of the ethylene production unit.

Discharge Preventable - Under Investigation

This release was caused by an unanticipated thermowell leak. Root cause investigation will be conducted to determine if additional corrective actions are required.

Notes/Remedial Actions

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.