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ExxonMobil Refinery (2638), Baton Rouge

Releases of n-Butane

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

Cause: C-830 compressor shut down causing ICN unit to shutdown. F-761 control valve was left on control to allowing the liquid level in the ICN product stabilizer tower to continue to tank732. Excess flammable vapor was released.

Followup: No

Notes: it was discovered that the F-761 control valve had not been closed, so it was closed once discovered and the release stopped; procedures will be reviewed and appropriate corrective actions will be ma
119.0 pounds

alkylation unit

Followup: No

Notes: water was sprayed on the vapor cloud to mitigate hazards from the release. Upstream and downstream block valves had to be closed to stop the leak; this was not preventable because the gasket failed- it was an appropriate gasket for the service
1,418.0 pounds

FLARE - Alkylation Feed Preparation Unit
Cause: The Methyl Tertiary-Butyl Ether Unit was converted to an Alkylation Feed Preparation Unit (AFP). The AFP was beginning its initial start up. As the level in one of the towers increased, steam was added to the reboiler to begin producing overhead product. During this time, the safety valves on the tower began relieving to the flare system, which resulted in the reported flare. During the conversion of the unit the overhead pressure meter was reranged in the field, but was no reranged in the control room. Due to this oversight the operator believed he was at a significantly lower pressure and did not immediately discover that the safety valves on the tower had lifted to the flare system. The calculations automtically completed by the flare system

Followup: No

Notes: The cause of the accident is listed as preventable in the company's report, but there is no explanation whatsoever as to why it was preventable - that section is blank. The only remedial measure listed is that the pressure meter range was corrected in the control room. The letter to LDEQ states that reportable quantities of nitrogen oxide and butenes were exceeded.
5,276.0 pounds

MTBE Unit Exchanger E-557
Cause: MTBE Unit Exchanger was discovered to leaking into the condensate system causing vapor to flash off. The failure mechanism causing the leak in the exchanger is listed as unknown.

Followup: No

Notes: Incidents 06-00380, 06-00401 occurred simultaneously on January 19th and on Jan. 20th 06-00406 occurred, overlapping with the first two. The reportable quanitites for highly reactive volitile organic compounds and flamable vapors were exceeded whenthe emissions from these three events were summed over the first 24 hour period beginning with the initiantion of the rlease from the No. 2 Powerformer Unit. With regard to the 24 hour period beginning with the release at the MTBE Unit, there were nportable quanity exceedances for this period of time. The emissions limit exceeded the reportable quanitity threshold only during the time when all three incidents were taking place simultaneously. The mortar in T-4X will be replaced with a Furan re

Exchanger leak
Cause: underdeposit corrosion

Followup: No

Notes: Leaking exchangers were removed from service. The metallurgy of the exchangers is being evaluated for upgrading.
48.0 pounds

FLARE-Flare #5,7,17,19
Cause: OTHER-Electrical failure of Coker units

Followup: No

Notes: Personnel initiated startup of idle compressor recovering most of coker gas. Alternate electrical coordination settings and power supply designs are being evaluated for this system.
38.0 pounds

Leak/feed line leak
Cause: Corrosion/corrosion leak occurred through a 3/8 hole on the #2 feed inlet pip

Followup: No

Notes: The tower that the corroded pipe led to was shut down and filled with water to stop residual hydrocarbon vapors from leaking out of the hole. The hole was plugged.An engineered leak box was installed on the line.
1,298.0 pounds

no informaiton given/leak
no information given/leak
Cause: no information given

Followup: No

Notes: Written notification from Exxon Mobile surrounding the leak that occurred at the facility stating that no reportable quantities had been exceeded.
45.0 pounds