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|LDEQ Accident Number
|Point Source(s)||Notes||Amount of Release|
|Pump 5016B||Cause: On 12/9/12, Shell Chemical OL-5 operations discovered a pressure gauge on the piping of Pump 5016B in the OL-5 Process Unit leaking hydrocarbon. Operations personnel immediately isolated the pressure gauge to stop the leak.|
Notes: Operations personnel immediately isolated the pressure gauge to stop the leak. Operations also isolated the storm drain to contain the spilled material. A pumper truck was called to remove the liquid. The pressure gauge was replaced before the pump was returned to service. No materials were released above the RQ.
|WOGF, GO-1 EF||Cause: On December 6, 2012, Shell Chemical's GO-1 flared at the GO-1 Elevated Flare (EPN 1-90). The flaring was a result of an unexpected loss of power due to the trip of an Entergy breaker supplying the GO-1 unit. The GO-1 Unit trip caused a release to the atmosphere from the GO-1 Propylene Splitter Column.|
Notes: GO-1 operations took the necessary steps to minimize flaring and safely return the unit to normal operating conditions and the flaring stopped. Data gathering to perform calculations and investigation are ongoing. Shell provided an amended final follow up notification on June 27, 2013. Reportable quantities for VOCs were exceeded. On December 9, 2012 the reportable quantities for Carbon Monoxide, Nitrogen Oxide, Particulate Matter, and 1,3-Butadiene were exceeded. On December 8, 2012 reportable quantities for particulate matter were exceeded. On a report dated June 27, 2013, the emissions of propylene and propane were amended.
|OL-5 Elevated Flare (EPN 6-84)||Cause: On December 2, 2012, Shell Chemical's OL-5 Process Unit experienced an unexpected leak of the Core Exchanger, which led to flaring at the OL-5 Elevated Flare to isolate the leaking exchanger, repair, and return it to service. The release began on December 2, 2012 at 6:15 AM and ended on December 6, 2012 at 11:55 PM.
Repairs were made to the core exchanger and the unit was safely returned to normal operations conditions.|
Notes: The unit was secured and adjustments made to minimize flaring. Preparations were begun to complete repairs to the core exchanger. The flaring was stopped once the repairs were completed and the OL-5 process unit was safely restored to normal conditions. To prevent recurrence, maintenance practices were reviewed and improvements were made. Entire PDF report was not able to be uploaded. Contact LABB for the full report.
|GO-1 Elevated Flare (EPN 1-90)||Cause: Flaring from the GO-1 Elevated Flare (EPN 1-90) was a result of an unexpected shutdown of the propylene refrigerant compressor.|
Notes: GO-1 operations took the necessary steps to minimize flaring and safely return the unit to normal operating conditions and the flaring stopped. Investigation and data gathering confirm that no RQ or maximum permitted limits were exceeded.
|GO-1 Pressure Relief Device|
West Ops Ground Flare (EPN 9-84); GO-1 Elevated Flare (EPN 1-90)
|Cause: On June 23, 2012 Shell Chemical's GO-1 flared at the GO-1 Elevated Flare. The flaring was a result of an upset when the Propylene Refrigerant Compressor kickbacks started swinging and affecting the rest of the process unit. The swings became uncontrollable and the cold-side of GO-1 was shutdown to get the propylene refrigerant compressor and the ethylene refrigerant compressor under control. GO-1 flared process gas off the Process Gas Compressor 4th stage discharge and light fractionation columns, dry gas off the dry gas compressor discharge, and propylene and ethylene off the refrigeration compressors.
On June 23, 2012 Shell Chemical's GO-1 experienced a unit upset which led to flaring at Motiva's West Operations Ground Flare (EPN 9-84). The flaring was a result of a unit upset that caused a cold-side shutdown of the GO-1 Process Unit.|
Notes: The report was submitted more than seven days after the incident and verbal notification. GO-1 operations took the necessary steps to minimize flaring and safely return the unit to normal operating conditions and the flaring stopped. During this incident a pressure device opened to lower process pressure, releasing ethylene to the atmosphere. GO-1 operations took the necessary steps to safely return the unit to normal operating conditions and the flaring stopped. The pressure relief device closed once the pressure was lowered below the set-point. GO-1 Operations completed a Management of Change to reset the parameters in the compressor surge control system for the propylene refrigerant compressor to allow for the compressor to be restarted and prevent a reoccurrence of another similar incident. Motiva did not exceed any reportable quantities or maximum permitted limits. Shell Chemical - East exceeded its reportable quantity for highly reactive volatile organic compounds (ethylene) which was released from the a pressure relief device on GO-1 operations. It also exceeded its maximum permitted limits for 1,3 butadiene and hexane. It flared for 1 day and 21 hours (45 hours). Although Shell Chemical - East has stated that no reportable quantities were exceeded from flaring, some chemicals, such as benzene (RQ: 10 lbs) and sulfur dioxide (RQ: 500 lbs), etc. , exceeded their reportable quantities. The release of particulate matter from both flares was reported as smoking.
|Motiva West Operations Ground Flare (EPN 9-84); GO-1 Elevated Flare (EPN 1-90)||Cause: On June 22, 2012 Shell Chemical's GO-1 flared at the GO-1 Elevated Flare. The flaring was a result of a malfunction in the computer control system.
On June 22, 2012 Shell Chemical's GO-1 experienced a unit upset which led to flaring at Motiva's West Operations Elevated Flare (EPN 9-84). The flaring was a result of a malfunction in the computer control system.|
Notes: GO-1 operations took the necessary steps to safely return the unit to normal operating conditions and the flaring stopped. The follow-up later was sent more than 7 days after the incident occurred. Maintenance worked with the manufacturer of the DCS and discovered there was an issue with a card in the system. Upon filing the cards memory, a dumping of memory and resetting of the card occurs. This process led to the unexpected shutdown of equipment and the upset in the GO-1. The manufacturer had identified the problem with these cards, but no action to correct the issue had occurred. Maintenance has replaced the card with the issue in order to prevent a reoccurrence of this incident. Motiva did not exceed any reportable quantities or maximum permitted limits during this event. Shell Chemical East did not exceed any reportable quantities, but they did exceed their maximum permitted limits for carbon monoxide, nitrogen oxides, particulate matter, and volatile organic compounds. The pollutant totals were determined by adding together the releases from both Shell Chemical LP - East, GO-1 Elevated Flare (EPN 1-90) and Motiva West Ops Elevated Flare (EPN 9-84) together.
|OL-5 Elevated Flare FE-101 (EPN 6-84); OL-5 Ground Flare FG-101 (EPN 7-84)||Cause: On March 12, 2012 Shell Chemical's OL-5 Unit Operators got an indication that the Process Gas Compressor (PGC) first stage control valve had opened to the flare system due to high suction pressure. The PGC turbine had slowed down causing the kickback valves to open. Slowdown of the turbine was caused by a high level in the surface condenser.
The materials were released from OL-5 Elevated Flare FE-101 (EPN 6-84) and OL-5 Ground Flare FG-101 (EPN 7-84).|
Notes: OL-5 Operations lowered the surface condenser level and the kickback flows to lower the first stage suction pressure. These actions stopped the flaring. All materials routed to flare were combusted with an approximate destruction efficiency of 99.5% released from the OL-5 Elevated Flare and Ol-5 Ground Flare to the atmosphere and dispersed naturally. Maintenance was called in to troubleshoot the surface condenser level indication. Instrument mechanics checked level controller and found dirt on the flapper nozzle. The nozzle was cleaned and proper operation of the control valve was checked. Instrument mechanics also found the door to the instrument center in the open position, which possibly allowed dirt into the enclosure. Operational rounds have been updated to include the task to check enclosure doors. Propylene is listed in the LDEQ's Verbal report as having been released as well, but there is no mention of it later on in the follow-up report from Shell. The measurements were obtained by adding the same pollutants from both flares together. Initial report states material did go offsite. Air was monitored around the perimeter of the facility. No reportable quantities were exceeded, but permit levels were exceeded for ethylbenzene, toluene, and xylene.
|Relief valve in the OL-5 Process Unit||Cause: While making an inspection round on January 12, 2012, OL-5 operators found that a relief valve in the OL-5 Process Unit was leaking out of the vent connection.
Process data does not indicate that the relief valve reached a high enough pressure to open. This relief valve has a bellows and the bellows top flange ring was found to be cracked in the rolled edge. The crack was approximately 1.5" long, and is believed to be a manufacturing defect. The valve has been returned to the manufacturer for inspection.|
Notes: The operators immediately stopped the pump that supplies the pressure to this relief valve and the relief valve was blocked in per mitigation plan. The crack was approximately 1.5" long, and is believed to be a manufacturing defect. The valve has been returned to the manufacturer for inspection. The discharged was released mainly to a stormwater concrete containment area. There is some evaporation into the atmosphere. Vacuum truck cleaned up remaining material. Only benzene was above a reportable quantity during this leak.
|GO-1 Elevated Flare (EPN 1-90)||Cause: On December 19, 2013, GO-1 had an unexpected process upset which resulted in flaring at the GO-1 Elevated Flare. The flaring was a result of a swing on the cold site of GO-1, which resulted in an upset at the propylene re-compressor.
Ending date above is the reported anticipated end date, assuming troubleshooting efforts continue as planned.|
Notes: Operations is currently stabilizing the unit and minimizing the flaring. Data gathering to perform calculations and investigation are ongoing. Shell will provide an update within 60 days.
|No information on re|
|West Ops Elevated Flare||Cause: On May 17,a release of carbon monoxide, ethane, and methane occurred due to flaring from a GO-1 unit upset caused by a De-methanizer shutdown. Unit feed composition caused unanticipated low temperature issues leading to a unit shutdown.|
Notes: GO-1 operations took the necessary steps to safely return the unit to normal operating conditions and minimize flaring. Procedures will be updated to provide guidance and operational measures to restore normal operations after a unit shutdown.
|8-84 RCCU Elevated Flare (FE-201)|
1-90 (GO-1 Elevated Flare, FE-602)
5-84 (West Ops Elevated Flare, FE-601)
|Cause: On May 10, Motiva's Residual Catalytic Cracking Unit (RCCU) discovered a catalyst leak in the unit's second cyclone dip leg. Operations responded immediately and worked to isolate this section of the unit. However, due to the location of the leak it was determined the line could not be isolated without diverting the RCCU process unit to hot circulation. The diverting process required flaring at the GO-1 Elevated flare (EPN 1-90) and West Ops Ground Flare (EPN 9-84). Additional flaring occurred at the Motiva RCCU Elevated Flare (EPN 8-84). Emissions from that flare should be addressed in a separate letter from Motiva.
The reintroduction of Motiva's RCCU untreated dry gas resulted in the shell GO-1 unit flaring to the West Ops Elevated Flare.|
Notes: Once system was secured, Motiva's maintenance personnel began repairs at the catalyst leak point. By May 12, the repairs on the system were completed and the system was returned to service. The diversion and reintroduction of RCCU Untreated Dry Gas caused the Shell GO-1 unit to flare to the GO-1 Elevated Flare (EPN 1-90) until unit specifications were met. This flaring exceeded reportable quantities.
|OL-5 Elevated Flare, FE-101||Cause: On April 19, 2013 Shell Chemical's OL-5 Process Unit experienced an unexpected upset that led to flaring at the OL-5 Elevated Flare (EPN 6-84). The flaring was caused by high pressure on the process gas compressor (PGC) first stage suction drum. A pressure increase on the suction drum was due to the PGC slowing down as a result to the loss of vacuum on the compressor surface condenser. The surface condenser vacuum was lost due to a faulty level indication causing the loss of vacuum on surface condenser. The PGC upset also caused OL-5 cold-side to flare propylene off the outlet of the map converters because of a low flow shutdown of the converters.|
Notes: OL-5 operations field verified the level int he PGC surface condenser and took corrective actions to safely return the unit to normal operating conditions and stop the flaring. OL-5 Maintenance repaired the PGC surface condenser level transmitter. Control systems adjusted the vacuum alarm setting for the PGC surface condenser to warn operators before the surface condenser vacuum is lost. Final calculations confirm that no reportable quantities were exceeded. The maximum permitted limits were exceeded for particulate matter, ethylbenzene, toluene, and xylene.
|DU-5 Unit||Cause: On September 12, 2014, Motiva's DU-5 unit received a shipment of crude oil that contained an unusually large amount of water. DU-5's normal operations removes the water from the crude and sends the water to the unit desalters. The large volume of water that was removed from the crude formed an emulsion which caused the desalter level instrumentation to malfunction. After the desalters, the water is routed to the sour water drum, but due to the instrumentation malfunction on the desalter, the water sent to the sour water drum exceeded the volume that could be pumped from the drum. The water sent to the sour water drum overflowed into the Low Pressure Flare Header. Once the water overflowed to the Low Pressure Flare Header, the liquid went to the Shell Chemical LP Utilities East Flare Pot and was combusted at the Utilities East Flare.|
|Process gas compressor in OL5 Unit||Cause: On 3/6/2014, Shell Chemical's OL5 Unit flared process gas at the OL5 Elevated Flare due to low seal oil pressure on the process gas compressor (PGC). To improve the performance of the seals on the PGC, operations manipulates valves on the PGC seal oil system. While shifting from automatic operation of the pressure controller on the second stage seal of the PGC to manual operation of the pressure controller, the valve on the pressure controller closed and caused low seal oil pressure. As a result, the PGC unexpectedly shut down as a safety measure to prevent potential catastrophic failure of the equipment.|
Notes: To minimize additional unit upset conditions and impacts, the OL5 Unit was safely stabilized. Operations adjusted the valve on the pressure controller and the seal oil pressure was restored. Operations was able to safely restart the PGC and return normal operating conditions. To prevent the reoccurence of this incident, it will be determined if tuning adjustments are needed on the pressure controllers associated with the PGC operation. As an additional precautionary measure, all employees that operate the PGC will review the transfer process for these local controllers. In the report, it is stated that the process gas was flared at the OL5 Elevated Flare. Later in the document both the OL5 Elevated Flare (EPN 6-84) and the OL5 Ground Flare (EPN FE-101) are implicated in the flaring of the process gas. There is some improper labeling on the EPN number in the tables, but it appears that the flaring occurred at both flares simultaneously. As such, all values released are combined in this database.
|OL-5 Ground Flare (EPN 7-84) and OL-Elevated Flare (EPN 6-84)||Cause: xylene, toluene, 1-3 butadiene, benzene, carbon monoxide, ethyl benzene, nitrogen oxide, particulate matter, volatile organic compounds, and sulfur dioxide flared at the OL-5 Ground Flare (EPN 7-84) and OL-Elevated Flare (EPN 6-84). The flaring resulted from a unit shutdown to repair the C2 Splitter Exchanger that was leaking.|
Notes: There is no information on the amounts nor an incident ending date. The anticipated end time was reported as 1/17/2014. Shell stated they would provide an update within 60 days of the initial report on 1/9/2014 as of 9/5/2014 there has yet to be any kind of follow up report from Shell regarding this matter.
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