CENTURION PIPELINE L.P.

Incident Narrative

ON APRIL 14, 2018, AT APPROXIMATELY 11:30 AM, A SEAL LEAK WITHIN THE TANK 1938 MIXER HOUSING WAS IDENTIFIED BY A CENTURION PIPELINE, L.P. (CPL) EMPLOYEE. TANK 1938 IS LOCATED AT CPL'S MIDLAND STATION NEAR MIDLAND, TEXAS, IN MIDLAND COUNTY, TEXAS. THE FAILED SEAL WAS IMMEDIATELY REMOVED AND REPLACED. HOWEVER, APPROXIMATELY 4.5 BARRELS OF CRUDE OIL WAS RELEASED ONTO THE TANK CONTAINMENT BERM. ONE (1) BARREL OF THIS CRUDE OIL WAS RECOVERED AND THE CONTAMINATED SOIL IS BEING REMEDIATED ON-SITE. THE CAUSE OF THE SEAL FAILURE IS CURRENTLY UNKNOWN, BUT IS BEING INVESTIGATED. THE INVESTIGATION RESULTS WILL DETERMINE THE FAILURE CAUSE AND POSSIBLE ACTIONS TO PREVENT FUTURE FAILURE WILL BE DETERMINED. A SUPPLEMENTAL REPORT WILL BE FILED FOLLOWING THE FAILURE INVESTIGATION AND SUBSEQUENT ACTIVITIES. THE MIXER WAS INSTALLED IN 2014. THERE WERE NO INJURIES OR FATALITIES ASSOCIATED WITH THIS EVENT. SUPPLEMENTAL REPORT FILED ON JUNE 6, 2018: CPL'S INVESTIGATION HAS BEEN COMPLETED. THE CAUSE OF FAILURE WAS DETERMINED TO BE NORMAL WEAR AND TEAR OVER THE LIFE OF THE SEAL. IN RESPONSE TO THIS ACCIDENT AND INVESTIGATION, CPL IS EITHER REPLACING OR UPGRADING ALL TANK MIXERS, AS THE RESPECTIVE TANK IS TAKEN OUT OF SERVICE FOR SCHEDULED API 653 INSPECTIONS, WITH A SEAL POT LEVEL SWITCH AND VIBRATION TRANSMITTER. AFTER THE REPLACEMENT OR UPGRADE, IF THE MIXER IS LEAKING, THE SEAL POT WILL BE FILLED CAUSING THE LEVEL SWITCH TO BE TRIGGERED RESULTING IN THE MIXER BEING SHUT OFF. THIS WILL PREVENT CATASTROPHIC FAILURE TO THE SEAL. IN ADDITION, THE VIBRATION TRANSMITTER WILL SHUT DOWN THE MIXER IF EXCESSIVE VIBRATION FORCES ARE DETECTED. THE MIXERS ARE AND WILL BE INSPECTED FOR VISIBLE LEAKS DURING CPL'S MONTHLY BREAKOUT TANK INSPECTIONS. SUPPLEMENTAL REPORT FILED ON JUNE 14, 2018: CENTURION PIPELINE, L.P. IS FILING AN ADDITIONAL SUPPLEMENTAL AND FINAL REPORT AT PHMSA'S REQUEST TO CHANGE QUESTION A.11 TO 4.5 AND QUESTION D.8E TO $3790.