ROADRUNNER PIPELINE, L.L.C.

Incident Narrative

TIMELINE OF ROADRUNNER SUMP INCIDENT 2/12/16: 17:39 AND 17:42 SCADA RECORDED AN ABNORMAL STATE ALARM AT ROADRUNNER RECEIVING. HEP TECH DISPATCHED TO ROADRUNNER RECEIVING INVESTIGATE. 17:51 SCADA AT ROADRUNNER RECEIVING WENT INTO COMMUNICATION FAILURE 19:30 HEP TECH ARRIVED AT ROADRUNNER RECEIVING RESTORED COMMUNICATIONS. WHEN COMMUNICATIONS WERE RESTORED THE HEP CONTROL CENTER RECEIVED A HIGH SUMP ALARM. HEP TECH WAS ADVISED AND DISCOVERED THAT THE SUMP HAD OVERFLOWED, RELEASING WHAT WAS ULTIMATELY DETERMINED TO BE APPROXIMATELY 34 BARRELS OF CRUDE, OF WHICH 20 BARRELS WAS RECOVERED BY A VACUUM TRUCK. INITIAL SPILL SOURCE AND CONTRIBUTING FACTORS FINDINGS: RESPONSE PERSONNEL FOUND THAT MOTOR OPERATED VALVE 1219 WAS 75% CLOSED, NO COMMAND TO CLOSE WAS SENT BY THE CONTROL CENTER. LOCAL PRESSURE RECORDING DEVICE (YOKOGAWA) RECORDED A PRESSURE INCREASE TO 258 PSI. THE 285 PSI THERMAL RELIEF VALVE (DOWNSTREAM OF THE STATION CONTROL VALVE) OPENED, CAUSING THE SUMP TO OVERFILL AND RELEASE PRODUCT. THE CONTROL CENTER DID NOT RECEIVE ANY INDICATION OF THE SUMP OVERFILLING DUE TO THE COMMUNICATION FAILURE. INCIDENT INVESTIGATION/ROOT CAUSE ANALYSIS A BLOWN FUSE REVEALED A DIRECT SHORT IN THE WIRING, WHICH IS THE PLAUSIBLE EXPLANATION THAT MOV 1219 RECEIVED THE NECESSARY VOLTAGE INITIATING A LOCAL CLOSE COMMAND. WIRING IN THE CONDUIT BETWEEN THE PLC AND THE VALVE WERE FOUND TO BE SHORTED OUT, EVIDENCED BY ARC MARKS. MITIGATIVE & CORRECTIVE MEASURES 1. CONDUIT AND WIRING ENTIRELY REPLACED. 2. MOV 1219 LOCKED OUT/TAGGED OUT IN THE OPEN POSITION.