ANR PIPELINE CO

Incident Narrative

THE PRODUCER OPERATOR AT SHIP SHOAL 204 CALLED IN TO REPORT A LEAK ON THE INCOMING ANR RISER. AFTER REPEATED CALLS BACK TO THE PRODUCER AND GETTING A PHOTOGRAPH FROM THE LOCATION, IT WAS ESTABLISHED THAT THE LEAK WAS ON THE INCOMING 12"" 763 LATERAL. THE ATMOSPHERIC LEAK IS 9 FEET ABOVE THE WATERLINE UNDER A PIPE SUPPORT CLAMP WELDED TO THE LEG OF THE PLATFORM. THE ACCOUNT FROM THE PRODUCERS STATES THERE ARE NO ENVIRONMENTAL OR SAFETY ISSUES AT THIS TIME. THE PIPELINE WAS IMMEDIATELY ISOLATED WITH NOTIFICATIONS TO GAS CONTROL AND COMPLIANCE. REPAIR PLAN: ANR PIPELINE HAS SHUT IN ITS 12-IN. PIPELINE AND ALL PRODUCTION SOURCES UPSTREAM OF SS 204 BECAUSE OF A LEAK IN THE LINE. THE LEAK, ASSUMED TO BE THE RESULT OF CORROSION, IS ON THE 12-IN. RISER UNDER A RISER CLAMP AT THE +9 LEVEL. THIS ELEVATION IS A CRITICAL COMPONENT OF THE REPAIR. A REPAIR PLAN HAS BEEN DEVELOPED, WHICH INCLUDES THE INSTALLATION OF AN ENGINEERED, FULLY-WELDED SLEEVE. THE SLEEVE HAS NOW BEEN RECEIVED. WITH THE ADDITION OF THE SLEEVE, THE EXISTING RISER CLAMP HAS TO BE MODIFIED. FABRICATION OF THE NEW CLAMP WAS COMPLETED. A PRE-JOB WAS HELD WITH THE CONTRACTOR ON MAY 1. THE CONTRACTOR MADE FINAL PREPARATIONS FOR MOBILIZATION. MOBILIZATION WAS TARGETED FOR MAY 7, PENDING FAVORABLE WEATHER CONDITIONS. BECAUSE OF WEATHER DELAYS AND OTHER CONSTRUCTION AND FABRICATION DIFFICULTIES, THE REPAIR OF THE LINE WAS NOT COMPLETED UNTIL JULY 6, 2012.