HOLLY ENERGY PARTNERS - OPERATING, L.P.

Incident Narrative

AT APPROXIMATELY 11:15 MT CONTRACT RIGHT OF WAY EMPLOYEES DISCOVERED A SMALL STAIN ON OUR 6"" EL PASO PIPELINE RIGHT OF WAY. THE CONTRACTORS STOPPED TO INVESTIGATE THE AREA FURTHER AND DETERMINED THAT THE GROUND WAS WET AND THERE WAS A SLIGHT ODOR OF HYDROCARBON. AT THIS POINT, THE CONTRACTORS CONTACTED HEP'S MAINTENANCE SUPERVISOR AND IMMEDIATELY REPORTED THE FINDINGS TO HIM. HEP'S MAINTENANCE SUPERVISOR IMMEDIATELY CONTACTED THE CONTROL CENTER AND REQUESTED AN IMMEDIATE SHUTDOWN OF THE SYSTEM. THE PIPELINE CONTROLLER ON DUTY IMMEDIATELY SHUT DOWN AND BLOCKED IN THE PIPELINE AND BEGAN MAKING NECESSARY NOTIFICATIONS TO ALL APPLICABLE PARTIES. HEP'S MANAGER OF PIPELINE OPERATIONS WAS CONTACTED AND DISPATCHED TO THE LOCATION FOR CONFIRMATION OF THE CONTRACTOR'S FINDINGS. AT 12:05 MT HEP'S MANAGER OF PIPELINE OPERATIONS ARRIVED ON SITE AND WAS ABLE TO CONFIRM THAT A RELEASE HAD OCCURRED FROM OUR 6"" EL PASO PIPELINE. HEP MAINTENANCE CREW HAND DUG TO UNCOVER THE PIPE WHICH HAD A DEPTH OF COVER OF 22"". ONCE THE PIPE WAS UNCOVERED, HEP WAS ABLE TO DETERMINE THAT A FAILED CLOCK SPRING WAS THE INITIAL CAUSAL FACTOR OF THE RELEASE. UPON FURTHER INVESTIGATION AND REMOVAL OF THE CLOCK SPRING, A CRACK WAS DISCOVERED ON THE BOTTOM-SIDE OF THE PIPE. A PLIDCO CLAMP WAS APPLIED TO STOP ANY REMAINING PRODUCT FROM ESCAPING THE PIPE. ALL NECESSARY HAND VALVES ALONG THE PIPELINE WERE CLOSED, AND PUMP STATIONS WERE LOCKED OUT AND TAGGED OUT. THE LINE REMAINED DOWN UNTIL ALL NECESSARY REPAIRS WERE COMPLETED. THE AFFECTED JOINT OF PIPE WAS REMOVED AND REPLACED WITH X-52 GRADE, .219-WALL, PRE-TESTED STEEL PIPE. THE PIPELINE WAS RETURNED TO NORMAL SERVICE AT 20:26 MST ON FEBRUARY 14, 2019.