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Accident # | 91442 |
State Police # | 06-3236 |
Accident Date | 2006-10-17 |
Report Date | 2006-10-24 |
Follow-up Date | 2007-03-29 |
Follow-up: | Yes |
Pollutant | Duration | Point Source | Greenhouse Gas | Criteria Pollutant | Ozone forming chemical | Amount of Release |
Sulfur Dioxide | 7h 15m | TGTU no. 1 incinerator stack and TGTU no. 4 incinerator stack | NO | YES | NO | 795.0 pounds |
Accident Classified As: Reportable Quantity
Sulfur Recovery Unit (SRU) No. 5 tripped due to low airflow, which was caused by the trip of the turbine air blower (81C-101) on SRU-5. This subsequently causde TGTU-5 to trip, as these two units operate in series. With the trip of SRU-5/TGTU-5, acid gas processing ability decreased causing a subsequent increase in pressure on the acid gas header. This increase in pressure led to the trip of SRU-2/TGTU-1. The turbine air blower was determined to have tripped as designed due to excessive vibration from a mechanical failure in the turbine's speed governor.
Based on the maintenance and reliability history of the turbine, it was operable. The cause of the turbine trip via the governor could not be foreseen.
Minimized acid gas production by reducing charge rates, worked to restart units. Motiva plans to evaluate the process rate reductions needed from the acid gas generating units when upset conditions occur in the SRU/TGTU units in an attempt to reduce the potential for SO2 emissions from overloading the operating SRU/TGTU units. Motiva also plans to install a "Stackmatch" system in TGTU-1 during a 2008 Maintenance turnaround to reduce the delays associated with the lighting of the heater inline pilot. No LDEQ report in this file. Exceeded RQs and permit limits.
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