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Shell Facility (3462), St. Rose

Releases of Hexane

LDEQ Accident Number
Accident Date
Point Source(s) Notes Amount of Release
No LDEQ Reported

2005-12-15
5-77 (St. Rose Flare)
Cause: A failure of the pilot gas regulator caused the pilot fuel gas pressure to drop below normal. Inclement weather (high winds) then caused to flare pilot to blow out. Reported weather conditions at the time were cloudy with 17mph winds

Followup: No

Notes: The equipment failure was unexpected and thus the discharge was not preventable. Actions were taken to override the regulator and restore the gas flow to the pilot and hence relight the flare pilot. During this time gas flow to the flare was minimized The flare pilot regulator that failed was replaced with a formal investigation to follow to see if further corrective actions are necessary. NOTE: Quantity of material released was calculated using a formula that conservatively assumes the flare is emitting at its average rate just prior to and during the event.
81720, 81957, 83713

2005-08-28
7-84 (OL-5 Ground Falre, FG-101); 6-84 (OL-5 Elevated Flare, FE-101); 1-90 (GO-1 Elevated Flare, FE602); 3-84 (Utilities East Flare, FE 501)
Cause: Due to shutdown and damages associated with Hurricane Katrina

Followup:

Notes: The most significnt point source emissions were from the Elevated flare. The report does not include emissions from tanks, HCU Flare, Emergency Bypass Outfall and other equipment that was previously reported.
2,492.0 pounds
No LDEQ Reported

2006-07-02
St. Rose Flare
Cause: Electrical power dip which led to a pump shutdown and causing the de-salter to overpressure resulting in a pressure relief valve opening up and material vented to the flare

Followup: No

Notes: Pump restarted. Improvements to power supply are current project
0.4 pounds
No LDEQ Reported

2006-02-12
GO-1 Elevated Flare
Cause: In order to control the differential pressure, untreated dry gas was sent to the fuel gas system and the remaining amount was flared.

Followup: No

Notes: Incident involving the DEA treatment system is the subject of an ongoing investigation. Corrective actions will be implemented.
3.0 pounds
No LDEQ Reported

2007-09-24
5-77 (St. Rose Flare)
Cause: Power failure allowed two pressure relief valves to open to the flare to prevent over-pressuring of the unit

Followup: No

Notes: The power failure was unexpected. They secured the process unit until the power was restored. Electrical support will work with the energy supplier to understand what caused the failure and take appropriate corrective action to prevent reoccurence. Word for word what happened the prior month
5,001.2 pounds
98868

2007-08-23

EPN 5-77 St. Rose Flare
Cause: Power failure allowed two pressure relief valves to open to the flare to prevent over-pressuring of the unit

Followup: No

Notes: The power failure was unexpected. They secured the process unit until the power was restored. Electrical support will work with the energy supplier to understand what caused the failure and take appropriate corrective action to prevent it from reoccurring.
1.5 pounds
98478

2007-06-03
5-77 St. Rose Flare
Tank TK-8552
Tank TK-8553
Cause: During a crude tank switch there was a unit upset when water and emulsion from a feed tank was introduced into the process, leading to the over pressuring of a de-salter vessel to the flare, a spill of water and emulsion to the water treatment facility and the shutdown of the compressor with additional flaring. During this unit upset tanks TK-8552 and TK-8553 roof legs inadvertently landed on the floor

Followup: No

Notes: Initial written report issued 6/20/07 but investigation revealed additional vent streams were routed to the flare so the numbers were updated on 8/14/07. To prevent this the water in the crude oil tank should have been drained prior to being placed in service. The crude tank was switched back to prevent further water and emulsion from being fed into the unit. Necessary steps were taken to clean up the wastewater treatment facility & return unit to normal. Tanks TK-8552 and TK-8553 were refilled to their normal levels. In the future, the water in the crude tank will be drained before the tank is placed into service
5,027.0 pounds
No LDEQ Reported

2008-09-20
5-77 (St. Rose Flare)
Cause: Loss of steam pressure when a tube failed in the boiler resulting in flaring

Followup: No

Notes: The boiler tube failure could not be predicted. Shut the process unit down until boiler repairs could be completed. The incident will be investigated and appropriate corrective actions will be implemented to prevent reoccurrence
0.8 pounds
No LDEQ Reported

2008-07-17
5-77 (St. Rose Flare)
Cause: A bearing failed on the vent gas compressor for the vacuum unit.

Followup: No

Notes: The bearing failure was not predictiable. The compressor was shut down and a valve to the St. Rose flare was opened to lower and control the seal drum pressure. The compressor was replaced with a spare and the unit was returned to normal operating conditions. The spare will be replaced with the repaired compressor during the next unit outage
0.0 pounds
No LDEQ Reported

2008-01-03
5-77 (St. Rose Flare)
Cause: Power failure lead to unit shutdown, resulting in a unit upset and flaring

Followup: No

Notes: Power failure was caused by Entergy and was unplanned. All heavy product lines were flushed with a diesel driven flush pump. Incident will be reviewed with Entergy to discuss what happened and what can be done to prevent recurrence.
0.8 pounds