EQUISTAR CHEMICALS, L.P.

Incident Narrative

2021-07-19 INITIAL REPORT - AT 0903 ON 6/21/2021 A PIPELINE REPRESENTATIVE OF ANOTHER PIPELINE OPERATOR CALLED THE CONTROL ROOM TO REPORT A POOL OF WHAT THEY THOUGHT WAS HYDROCARBON LIQUID. A EQUISTAR TECHNICIAN WAS DISPATCHED TO THE LOCATION AND ARRIVED AT 0925 AND OBSERVED A PUDDLE MEASURING APPROXIMATELY 6'X15'. AT THAT TIME THE PIPELINE WAS NOT FLOWING AS IT ONLY FLOWS A COUPLE TIMES A MONTH. AT APPROXIMATELY 12:30 SAMPLE WAS TAKEN AND IT WAS DETERMINED TO BE CONDENSATE BUT IT COULD NOT BE DETERMINED IF IT WAS AN EQUISTAR PRODUCT. THE PRESSURE WAS INCREASED FROM 12 PSI TO 75 PSI WITH NO INDICATION OF A LEAK. THE PRESSURE WAS INCREASED TO APPROXIMATELY 265 PSI AT 17:00 AT WHICH TIME IT WAS DETERMINED THE LEAK WAS FROM THE EQUISTAR PIPELINE 11. APPROXIMATELY 16' OF PIPELINE WAS CUT OUT AND REPLACED. THE PIPELINE WAS RESTARTED ON 7/7/2021 AT 13:33. THE PIPE CONTAINING THE LEAK LOCATION WAS SENT TO A THIRD PARTY LAB ON 7/14/2021. 8/5/2021 - UPDATED ESTIMATED COST LAB RESULTS FOUND THE CAUSE OF THE FAILURE WAS DUE TO INTERNAL CORROSION CAUSED BY MICROBIOLOGICALLY INDUCED CORROSION (MIC) IN A LOW SPOT WHERE THE FLOW HAD BECOME STAGNANT. 8/25/2021 - INTERNAL INVESTIGATION COMPLETED ON 8/20/21. IMMEDIATE CAUSE WAS DETERMINED THE CAUSE OF THE LEAK WAS DUE TO MIC. CORRECTIVE ACTION WAS TO REMOVE THE LINE 11 LATERAL. THE LATERAL HAS BEEN REMOVED AND THE MAINLINE IS IN SERVICE.