MARATHON PIPE LINE LLC
hazardous_liquid Incident — — September 9, 2015
Incident Information
| Incident Date | September 9, 2015 |
| Operator | MARATHON PIPE LINE LLC |
| Commodity | HVL OR OTHER FLAMMABLE OR TOXIC FLUID WHICH IS A GAS AT AMBI |
| Pipeline Type | hazardous_liquid |
Location
| State | |
| Coordinates | 29.33678, -94.95822 |
Cause
| Cause | INCORRECT OPERATION |
| Subcause | "VALVE LEFT OR PLACED IN WRONG POSITION, BUT NOT RESULTING IN A TANK, VESSEL, OR SUMP/SEPARATOR OVERFLOW OR FACILITY OVERPRESSURE" |
Casualties
| Fatalities | 0 |
| Injuries | 0 |
Costs
| Property Damage | $100 |
| Emergency Response | $70,925 |
| Other Costs | $0 |
Location Map
Incident Narrative
"MPL PERSONNEL ARRIVED ON SITE AT APPROXIMATELY 09:00 CST TO REPACK THE HIGHLAND BAYOU BV. THE BLOCK VALVE WAS CLOSED AND THE BODY RELIEF VALVE WAS THEN OPENED TO REMOVE PRESSURE FROM THE BLOCK VALVE. THE EMPLOYEE BELIEVED THE BODY RELIEF VALVE TO BE MALFUNCTIONING AND DID NOT CLOSE THE VALVE. PERSONNEL THEN LEFT THE AREA DUE TO SAFETY CONCERNS. THE LINE WAS SHUT DOWN AND ONCE THE AREA WAS DEEMED SAFE, PRESSURE WAS REMOVED FROM THE LINE. THE FITTING WAS REPLACED WHILE THE LINE WAS DOWN AND THEN RETURNED TO NORMAL OPERATIONS. NO IMPACT TO SOIL. UPON FURTHER INVESTIGATION, THE BODY RELIEF VALVE WAS DETERMINED TO BE FIT FOR SERVICE. THE CAUSE OF THE INCIDENT IS CONSIDERED TO BE INCORRECT OPERATIONS. MPL REPORTED THE QUANTITY RELEASED AS ""UNKNOWN"" ON THE INITIAL NRC REPORT (#1127964). A SECOND REPORT (#1128048) WAS MADE TO UPDATE THE VOLUME TO 50 BARRELS. ADDITIONALLY, THE ESTIMATED 1,338 BBLS THAT WERE RELEASED DURING THE CONTROLLED BLOWDOWN TO REMOVE PRESSURE FROM THE LINE WERE DONE SO THROUGH A TEMPORARY FLARE SYSTEM. 5/7/19 - UPDATED GPS COORDINATES IN PART A"
About This Pipeline Incident
Pipeline incident data is reported to the Pipeline and Hazardous Materials Safety Administration (PHMSA). All significant incidents involving fatalities, injuries, or property damage over $50,000 must be reported.