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ExxonMobil Refinery (2638), Baton Rouge

LDEQ Accident Report

Accident #87870
State Police #06-03032
Accident Date2006-05-16
Report Date 2006-05-22
Follow-up Date 0000-00-00
Follow-up: No

Pollutants Released

Pollutant Duration Point Source Greenhouse Gas Criteria Pollutant Ozone forming chemical Amount of Release
Propane144hD-104 HydrocrackerNONOYES509.0 pounds
Butane144hD-104 HydrocrackerNONOYES132.0 pounds
Butane144hD-104 HydrocrackerNONOYES204.0 pounds
Pentane144hD-104 HydrocrackerNONOYES19.0 pounds
Isopentane144hD-104 HydrocrackerNONOYES105.0 pounds
Hydrogen144hD-104 HydrocrackerNONONO549.0 pounds
Water144hD-104 HydrocrackerNONONO21.0 pounds
Hydrogen Sulfide144hD-104 HydrocrackerNONONO482.0 pounds
Ammonia144hD-104 HydrocrackerNONONO50.0 pounds
Benzene144hD-104 HydrocrackerNONOYES2.0 pounds
Methane144hD-104 HydrocrackerYESNOYES1,344.0 pounds
Ethane144hD-104 HydrocrackerNONOYES674.0 pounds
Flammable Vapor144hD-104 HydrocrackerNONOYES4,131.0 pounds
Volatile Organic Compounds (VOCs)144hD-104 HydrocrackerNONOYES40.0 pounds

Accident Classified As:

Cause of Problem: Other

the clamp on the Hydrocracker D-104 overhead line was leaking. The pressure of the overhead gas was reduced and several attempts were made to reseal the clamp, including trying several different kinds of sealant. The leak would stop for a short durationand then return

Discharge Preventable - No

Notes/Remedial Actions

As of 7:30am on 5/22/2006 - the date of this letter - the leak was ongoing. In this letter, Exxon claims states that the reportable quantities for hydrogen sulfide and flammable vapor were exceeded only during the first 24 hours of the incident. This incident was not preventable because the clamp was considered to be a permanent repair (installed in Dec. 2005) until the scheduled unit downtime in 2008. Remedial Measures- a larger engineered clamp will be installed over the existing clamp. "