PHILLIPS 66 PIPELINE LLC — Hazardous liquid — incident on 2025-10-24

Hazardous liquid incident in COMMERCE CITY, ADAMS County, CO. Reported cause: EQUIPMENT FAILURE. Reported consequences: 0 fatalities, 0 injuries, 3165 REFINED AND/OR PETROLEUM PRODUCT (NON-HVL) WHICH IS A LIQUID AT AMBIENT CONDITIONS released, $10,000 reported property damage. Operator-reported incident data submitted to PHMSA, generally within 30 days. Records may be supplemented or corrected and do not represent final agency causal findings.

Report number: 20250268.

Operator ID: 31684.

Reported incident date: 10/24/2025 0:33.

Location detail: TERMINAL

Cause detail: MALFUNCTION OF CONTROL/RELIEF EQUIPMENT

Cause detail: WHILE RECEIVING DELIVERY FROM PIPELINE INTO TANK 103 AT DENVER PRODUCTS TERMINAL A TANK OVERFILL OCCURRED RELEASING 3,165-BBLS OF DIESEL TO SECONDARY CONTAINMENT. OPERATIONS RECEIVED A NOTIFICATION FROM THIRD PARTY OF A POTENTIAL RELEASE ON TANK 103. FACILITY TECH CONTACTED CONTROL CENTER AND DIRECTED CONTROLLER TO SWITCH DELIVERY TO SECONDARY TANK. OPERATIONS WERE DISPATCHED TO TERMINAL AND DISCOVERED RELEASE. THE FACILITY WAS IMMEDIATELY SHUT DOWN, AND RESPONSE WAS INITIATED. 2,173-BBLS OF FREE PRODUCT WERE RECOVERED AND RETURNED TO TANKAGE; 992-BBLS WERE RECOVERED IN SATURATED SOIL AND DISPOSED. INVESTIGATION IS ONGOING TO DETERMINE CAUSE. UPDATE 1/27/2026: INVESTIGATION DETERMINED THAT THE TANK 103 RADAR GAUGE WAS FOUND TO BE MISALIGNED WHICH CAUSED IT TO MALFUNCTION BY INTERMITTENTLY SENDING INVALID LEVELS TO THE TANK GAUGING COMPUTER DUE TO LOW SIGNAL STRENGTH. AS A RESULT, HIGH LEVEL ALARMS WERE NOT SENT TO THE CONTROL CENTER CONTROLLER. THE RADAR GAUGE TRANSMITTER/RECEIVER ANTENNA IS MOUNTED TO A FLANGED MANWAY BY A BALL JOINT ATTACHMENT USED TO ALIGN THE TRANSMITTER/RECEIVER ANTENNA. FOLLOWING THE INCIDENT, IT WAS DETERMINED THAT THE BALL JOINT WAS LOOSE AND THIS CONTRIBUTED TO THE ANTENNA SHIFTING OUT OF ALIGNMENT. DURING INVESTIGATION NO DEFINITIVE CAUSE OF HOW THE BALL JOINT BECAME LOOSE COULD BE DETERMINED. ADDITIONALLY, AN INTERMITTENT �INVALID SIGNAL ALARM� IN THE FACILITY TANK GAUGE SOFTWARE WAS NOT CONFIGURED TO BE DELIVERED TO THE CONTROL CENTER SCADA SYSTEM. CORRECTIVE ACTIONS: -INSPECTED, REINSTALLED, AND LEVELLED TRANSMITTER/RECEIVER ANTENNA PER MANUFACTURERS INSTALLATION MANUAL. A COMPLETE SYSTEM OPERATIONAL CHECKOUT PERFORMED INCLUDING POINT TO POINT SCADA VERIFICATION, ALARM VERIFICATION, AND SYSTEM OPERATION TO CONFIRM PROPER CONFIGURATION AND OPERATION. -ADDITIONAL RADAR GAUGE INTERNAL ERROR CONDITION (INVALID SIGNAL) ALARMS WERE CONFIGURED WITHIN THE SCADA SYSTEM AND ADDED TO CONTROLLER CONSOLE TO IMPROVE SAFETY FACTOR AND FUNCTIONALITY. -REVIEWED EXISTING STANDARDS TO ENSURE THAT ALL INSTALLATION, MAINTENANCE, TESTING AND ALARM MANAGEMENT REQUIREMENTS FOR RADAR GAUGES ARE IDENTIFIED AND CONFIGURED APPROPRIATELY FOR ADDITIONAL LAYERS OF PROTECTION. -PHILLIPS 66 TECHNICIANS AND AUTOMATION SPECIALIST COORDINATED AN ONSITE CONSULTATION WITH THE VENDOR�S SUBJECT MATTER EXPERTS TO EVALUATE THE TANK GAUGING SYSTEM PERFORMANCE. ADDITIONALLY, VENDOR PROVIDED ONSITE TRAINING WITH FOCUS ON CONFIGURATION AND OPERATION. THIS WAS PERFORMED WITH TECHNICIANS AND AUTOMATION SPECIALISTS. THIS INFORMATION HAS BEEN SHARED ACROSS THE MIDSTREAM TECHNICAL GROUPS TO REVIEW ALL OTHER MIDSTREAM ASSETS, THAT UTILIZE THIS SYSTEM, TO IDENTIFY ANY SIMILAR ISSUES. -REVISION OF SECTION 13 OF CURRENT PSSR PROCEDURE TO PROVIDE ADDITIONAL CLARITY FOR INSTRUMENTATION INSPECTION AND OPERATIONAL VERIFICATION PRIOR TO RECOMMISSIONING OF TANKS.

PHMSA trend classification: significant incident, not serious.

PHMSA standardized cause: EQUIPMENT FAILURE — MALFUNCTION OF CONTROL/RELIEF EQUIPMENT.

PHMSA indexed costs: $356,000 reported total cost, $144,557.243 in 1984 dollars, $356,000 in current-year dollars.

PHMSA trend flags, standardized causes, and indexed costs are analytical fields added to operator-reported incident data. They do not represent final agency causal findings.