ROCKIES EXPRESS PIPELINE LLC

Incident Narrative

"ON AUGUST 9, 2025, AT 4:22 PM CST UNIT 5500 AT BERTRAND COMPRESSOR STATION EXPERIENCED A SHUTDOWN TRIGGERED BY MULTIPLE ALARMS. A TECHNICIAN RESPONDED TO THE CALL AND DISCOVERED THAT A COIL FAILURE HAD CAUSED THE RELAY OUTPUT CARD, WHICH CONTROLS ALL OPERATING VALVES OF THE UNIT, TO MALFUNCTION. THE TECHNICIAN ARRIVED ONSITE AT 6:10PM AND AT 6:33 PM CST, THE TECHNICIAN WAS ABLE TO MANUALLY CLOSE THE VALVES, STOPPING THE GAS RELEASE TO THE ATMOSPHERE AND STABILIZING THE SITUATION. INVESTIGATION IS ONGOING. SUPPLEMENTAL WILL BE SUBMITTED UPON COMPLETION. 2025-09-08 (SUPPLEMENTAL) SUPPLEMENTAL REPORT HAS BEEN SUBMITTED DUE TO A DATA ENTRY ERROR ASSOCIATED WITH THE VOLUME RELEASED AND COST. THE CORRECT INFORMATION HAS BEEN ADDED AND, ONCE THE CAUSE HAS BEEN DETERMINED A SUPPLEMENTAL/FINAL REPORT WILL BE SUBMITTED. 2025-12-23 (FINAL) UNIT 5500 HAD THE POWER FUSE TO THE I/O FOR THE UNIT VALVES FAIL. OCC CALLED THE TECH ON CALL AND TOLD THEM THE UNIT WENT DOWN. THE ALARM DID NOT STATE THE BLOWDOWN WAS OPEN WITH THE SUCTION AND DISCHARGE VALVES STILL OPEN. THE TECH RESPONDED TO FIND THE UNIT SUCTION AND DISCHARGE VALVES PERFORMED AS DESIGNED WHICH IS TO FAIL LAST STATE. THE BLOWDOWN VALVE PERFORMED AS DESIGNED AND FAILED TO THE OPEN POSITION. TALLGRASS HAS COMPLETED THE FOLLOWING CORRECTIVE ACTIONS: 1. ""TYPE 6"" CALLOUTS WILL GO TO OCC AS WELL AS THE TG PERSON ON-CALL FOR THE FACILITY. 2. OPERATIONS MANAGERS WILL COMMUNICATE TO TEAMS THAT A ""TYPE 6"" CALLOUT REQUIRES THEM TO REPORT TO SITE TO INVESTIGATE. TALLGRASS IS WORKING ON THE FOLLOWING CORRECTIVE ACTIONS: 3. EVALUATE IF A FIELD DESIGN CHANGE TO THE REX UNIT SUCTION AND DISCHARGE VALVES FAIL SAFE IS APPROPRIATE. 4. EVALUATE THE CALLOUT TYPES USED AT CHANDLERSVILLE AND DETERMINE IF WE CAN IMPROVE CLARITY BY MAKING THEM MORE DESCRIPTIVE."