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Accident # | 98724 |
State Police # | 07-04797 |
Accident Date | 2007-08-16 |
Report Date | 2007-08-23 |
Follow-up Date | 0000-00-00 |
Follow-up: | No Information Provided |
Pollutant | Duration | Point Source | Greenhouse Gas | Criteria Pollutant | Ozone forming chemical | Amount of Release |
Sulfur Dioxide | 30m | DHT Sour Gas Compressor/ DHT Overhead Receinver | NO | YES | NO | 261.0 pounds |
Accident Classified As:
the incident was triggered by a faulty level reading in the DHT Overhead Receiver (reading 30% less than actual). The compressor shut down when the knockout pot downstream of the DHT Overhead Receiver alarmed on high liquid level. The level gauge apparently failed due to scale (rust) plugging the instrument.
The incident is listed as preventable even though the only information included in that section is that MOUSA did not anticipate the accumulation of scale during the extended shutdown of the vessel. Remedial Measures - the DHT unit had been shut down for 110 days. MOUSA is working on plans to prevent scale formation by securing the Overhead Receiver under an inert atmosphere in any future extended shutdowns. Note: the flare resulted from an automatic safety shutdown of the DHT Sour Gas Compre - but nonetheless, the incident was triggered by a faulty level reading in the DHT Overhead Receiver - the level gauge having failed due to scale (rust) plugging the instrument.
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