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Significant Pollution Incidents - 1995

( > 50 barrels)
 

Date: 25-JAN-1995 Operator: Mesa Operating Co.
Investigation: Complete Activity: Development
Lease: G06140 Amount(bbl): 600 - Condensate
Area: High Island Operation: Drilling
Block: 55 Cause: Human Error
Rig/Platform: A Water Depth: 50'

Remarks: A workboat struck the platform causing two condensate storage tanks on the platform to rupture.
 

Date: 06-JUL-1995 Operator: Coastal Oil & Gas Corporation
Investigation: Complete Activity: Development
Lease: G07652 Amount(bbl): 75 - Condensate
Area: East Cameron Operation: Production
Block: 219 Cause: Equipment Failure
Rig/Platform: A Water Depth: 120'

Remarks: The condensate surge vessel pump malfunctioned, which caused the surge vessel to fill and backup to the production separator when the surge vessel LSH failed. The production separator carried over condensate to the water skimmer. The LSH on the skimmer tripped but failed to initiate a platform shut in. The skimmer carried over sufficient condensate to the sump tank to disrupt the condensate/water interface and displace the water level with condensate. The sump tank LSH tripped but also failed to shut in the platform. Condensate then carried over the sump tank through the sump tank water leg and into the Gulf.

Date: 03-OCT-1995 Operator: Meridian Oil Offshore, Inc.
Investigation: None Activity: Development
Lease: G14200 Amount(bbl): 89 - Diesel / Collision
Area: High Island Operation: Motor Vessel
Block: A 371 Cause: Weather
Rig/Platform: Rowan Gorilla IV Water Depth: 430'

Remarks: A weather change caused the motor vessel to drift into the port leg of the rig puncturing the boat's fuel saddle tank spilling 89 barrels (3,722 gal) of diesel fuel into the Gulf. Due to rough weather and sea conditions, no attempt was made by the boat company to recover the spilled fuel. There was no damage to the drilling rig or the port leg, and the boat returned safely to shore.
 

Date: 15-DEC-1995 Operator: Chevron
Investigation: Complete Activity: Development
Lease: G03265 Amount(bbl): 435 - Condensate
Area: West Cameron Operation: Production
Block: 198 Cause: Equipment Failure
Rig/Platform: A Water Depth: 56'

Remarks: A liquid hydrocarbon spill occurred offshore the State of Louisiana. A high-pressure separator was cleaned in an effort to reopen the separator's clogged water leg. Upon returning to the platform, the next day, the platform operator observed a spill and reported it to the MMS and the NRC. It was observed that liquid hydrocarbons were spilling from the platform's sump tank and that a ball valve on the drain line from the separator to the sump tank was not holding. The valve, which had been opened and closed during the previous day's cleaning of the separator, was removed, and the line was blind flanged. Meter readings and well tests were reviewed.