TENNESSEE GAS PIPELINE COMPANY

Incident Narrative

AT 6:20 PM, ON 1/11/2022, TENNESSEE GAS PIPELINE COMPANY (TGP) WAS NOTIFIED BY THE 3RD PARTY FACILITY OWNER OF A POTENTIAL LEAK ON A 24 INCH U BOLT PIPE SUPPORT INSIDE THE COCODRIE COMPRESSOR STATION. TGP FIELD OPERATOR ARRIVED ON SITE AT 10:36 PM AND UPON ARRIVAL, A LEAK WAS CONFIRMED AND ISOLATED. AT 11:13 PM, THE SEGMENT OF PIPE CONTAINING THE LEAK WAS BLOWN DOWN. TGP DEEMED THE INCIDENT REPORTABLE FROM A COST OF REPAIRS STANDPOINT. A NATIONAL RESPONSE CENTER (NRC) CALL WAS COMPETED AND TGP STARTED THE INTERNAL INCIDENT INVESTIGATION. THE PINHOLE LEAK WAS LOCATED AT THE 6 O CLOCK POSITION. THE PIPE IN THE AREA OF THE PINHOLE LEAK WAS ULTRASONICALLY SCANNED IN THE FIELD TO DETERMINE IF THERE WAS INTERNAL PIPE WALL LOSS. THE FIELD RESULTS CONCLUDED INTERNAL WALL LOSS IN THE PIPE CLAMP AREA RANGING FROM 30 - 50%. THE PIPE WAS REPLACED AND THE SPECIMEN CONTAINING THE LEAK WAS SHIPPED TO A METALLURGICAL LABORATORY FOR FURTHER ASSESSMENTS. THE LINE WAS PUT BACK IN SERVICE ON 1/20/2022. ON 3/10/2022, THE METALLURGICAL REPORT WAS COMPLETED CONCLUDING INTERNAL CORROSION WAS THE APPARENT CAUSE FOR THE LEAK EVENT. IN ORDER TO PREVENT REOCCURRENCE, TGP WILL BE REVIEWING THE ENGINEERING DESIGN TO MINIMIZE THE INTERNAL CORROSION IN THE STATION.