HOLLY ENERGY PARTNERS - OPERATING, L.P.

Incident Narrative

THE CONTROL CENTER RECEIVED TWO VAPOR MONITOR ALARMS AT SHACKLEFORD STATION. THE PIPELINE WAS SHUT DOWN, THE STATION WAS ISOLATED, AND A FIELD PERSONNEL WERE DISPATCHED TO THE LOCATION. THE FIELD TECHNICIAN ARRIVED ON SITE AND INFORMED THE CONTROL CENTER THAT THEIR WAS APPROXIMENTLY 2-3 BBLS OR DIESEL ON THE GROUND. FIELD PERSONNEL INFORMED US THAT THE RELEASE WAS DUE TO A NIPPLE/COLLAR THAT BROKE OFF OF PRV. REPAIRS WERE MADE TO THE BROKEN COLLAR. THE SITE IS BEING REMEDIATED, ALL CONTAMINATED SOIL WAS PLACED ON PLASTIC, REMOVED FROM SITE, AND PROPERLY DISPOSED OF. 2/12/18: IT IS BELIEVED THAT THE CAUSAL FACTOR OF THE 1/2 INCH NIPPLE CRACKING WAS POSSIBLY DUE TO AGE AND FATIGUE EXACERBATED BY VIBRATION ON THE MOTOR. ADDITIONALLY, THE ORIGINAL INSTALLATION UTILIZED STANDARD THICKNESS NIPPLES WITH ASSOCIATED PIPING AND OR FITTINGS WHICH WERE UNKNOWN PRIOR TO THE NIPPLE FAILING AND CAUSING THE RELEASE. AS A RESULT OF THIS INCIDENT, HEP REMOVED THE FAILED NIPPLE AND REPLACED IT WITH A SCHEDULE 160 (XX HEAVY) NIPPLE. ADDITIONALLY, HEP HAS PERFORMED A 'SURVEY' OF ALL OTHER NIPPLES AT SHACKLEFORD STATION AS WELL AS THE OTHER PUMPING STATIONS ALONG THE PIPELINE AND WILL BEGIN REPLACING ALL NIPPLES AND ASSOCIATED FITTINGS WITH SCHEDULE 160 (XX HEAVY) NIPPLES. HEP WILL ALSO BE PERFORMING VIBRATION ANALYSIS ON ALL OF THE ROTATING EQUIPMENT IN ORDER TO BETTER IDENTIFY VIBRATIONS DURING RUNNING CONDITIONS TO HELP REDUCE THE CHANCES FOR THESE TYPES OF FAILURE FROM REOCCURRING. 7/20/18; THROUGH CONTINUOUS IMPROVEMENT BY HEP INTEGRITY MANAGEMENT, AND CONSISTENT EVALUATION OF DATA, THE MOP OF THIS PIPELINE SEGMENT HAS BEEN DETERMINED TO BE 877 PSIG