SCOUT ENERGY MANAGEMENT LLC — Hazardous liquid — incident on 2023-04-16

Hazardous liquid incident in ROCK SPRINGS, SWEETWATER County, WY. Reported cause: EQUIPMENT FAILURE. Reported consequences: 0 fatalities, 0 injuries, 2828 CO2 (CARBON DIOXIDE) released, $2,700 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: 20230096.

Operator ID: 39317.

Reported incident date: 4/16/2023 6:41.

Location detail: MP 48

Cause detail: MALFUNCTION OF CONTROL/RELIEF EQUIPMENT

Cause detail: 4-16-2023 AT 0641 SCOUT CONTROL ROOM RECEIVED A CO2 PURCHASE PRESSURE ALARM GENERATED (PT9206) FROM THE CO2 REINJECTION FACILITIES CONTROL SYSTEM. CONTROLLER CALLED EXXON, THEY REPORTED NO PROBLEMS IN THEIR SYSTEM. PLANT OPERATOR PERFORMED A CO2 PLANT CHECK AND FOUND NO ISSUES. AT 0657 CONTROLLER CONTACTED PLANT FOREMAN (MIKE WILEY) AND WAS ADVISED TO SHUT FLOW CONTROL VALVE 9200, FOLLOWED BY EXXON SHUTTING THEIR VALVES AT 0702. CONTROLLER CLOSED RICHARDS GAP BLOCK VALVE MOV-19 AT 0715, WE THEN RECEIVED A LOW-PRESSURE ALARM FOR RICHARDS GAP (1685 PSI) AT 0721 AND ROCK SPRINGS (1619 PSI) AT 0722, THIS INDICATED AN ISSUE BETWEEN OUR POINT OF RECEIVING FROM EXXON TO RICHARDS GAP. CONTROLLER ALSO CLOSED ROCK SPRINGS BLOCK VALVE MOV 48-0 AT 0738. AT 0800 EXXON'S CONTROL ROOM CALLED SCOUTS CONTROL ROOM REPORTING A LEAK AT THE METER NORTH OF INTERSTATE 80 NEAR ROCK SPRINGS WYOMING. CONTROL ROOM DISPATCHED MECHANIC CODY SMUIN TO CLOSE MILE MARKER 53 BLOCK VALVE. AT 0847 CODY NOTIFIED THE CONTROL ROOM THAT HE IS 20 MINUTES OUT FROM BLOCK VALVE 53 AND THAT HE IS GOING TO CONFIRM WITH PLANT FOREMAN TO CLOSE BLOCK VALVE 53. AT 0857 CODY SUGGESTED TO THE PLANT FOREMAN THAT HE SHOULD GO TO ROCK SPRINGS INSTEAD OF BLOCK VALVE 53. CODY IDENTIFIED LEAKING PRESSURE SAFETY VALVE 48-1. AT 0914 CONTROL ROOM RECEIVED MOTOR OPERATED VALVE- LOCAL/REMOTE ALARM FOLLOWED BY A BUILDING INTRUSION ALARM FROM CODY BEING ONSITE, SWITCHING THE VALVE TO LOCAL AND SHUTTING MOV 48-1. AT 0925 CODY ISOLATED PRESSURE SAFETY VALVE 48-1 BY CLOSING HAND VALVE 48-11. PSV 48-1 FAILED OPEN, CAUSING THE CO2 RELEASE. UPON INVESTIGATION WE FOUND THAT THE ALARM PRESSURE SWITCH WAS NOT ACTIVE IN SCADA AND SHOULD HAVE ALARMED AT 50 PSIG FOR PSV- 48-1 BEING ACTIVE NOTIFYING THE CONTROL ROOM TO CLOSE MOV 48-1 TO ISOLATE THE FAILED PSV. WE HAVE CONSULTED WITH EMERSON/ ANDERSON GREENWOOD WHO MANUFACTURED THE FAILED PSV, ON 02/09/24 THEY HAVE ADVISED THAT WE SWITCH TO A 200 SERIES PILOT OPERATED SAFETY RELIEF VALVE AS WELL AS SWITCHING FROM A MODULATING ACTING VALVE TO A POP ACTING VALVE. WE BELIEVE THIS IS THE BEST COURSE OF ACTION FOR OUR C02 PIPELINE. OUR PSV'S ARE IN THE PROCESS OF BEING REBUILT AND WILL BE INSTALLED BY EMERSON/ ANDERSON GREENWOOD TECHNICIANS AS SOON AS POSSIBLE.

PHMSA trend classification: significant incident, not serious.

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

PHMSA indexed costs: $16,200 reported total cost, $6,844.649 in 1984 dollars, $16,856.265 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.