Incident details
Operator, cause, commodity and consequences with raw source fields.
HL incident on 2025-05-12 — TX
Operator
Exxonmobil Production Company, A Division Of Exxon Mobil Corporation
Cause
Equipment Failure
Commodity
Co2 (Carbon Dioxide)
Program
HL
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$3,000
Incident datetime
2025-05-12 00:00 UTC
Report number
Location
TX
Narrative
The amount of carbon dioxide released was determined to be approximately 4500 kilograms. The pipeline was shut off and repaired, the release was secured. At approximately 1000 on april 24th, 2025, a nearby operator from contango reported to the exxonmobil pipeline team that CO2 was venting form the exxonmobil bairoil vent stack just outside the bairoil metering station building. The local pipeline team was deployed to investigate the unintentional CO2 venting. An initial report was made to the nrc reporting the release at 1045 on april 24th, 2025. The exxonmobil pipeline team arrived at the bairoil metering station and isolated the leaking psv no 3131, at approximately 1320 on april 24th, 2025. The exxonmobil contractor psv team spartan arrived and tested the psv, no obvious failures were identified so the psv was pulled, rebuilt, and put back into service on april 24th, 2025. The cause of the incident was due to a premature psv failure. Psv are tested and/or rebuilt on an annual basis as part of the maintenance program.
Detailed record list
Report Received Date
2025-05-12 00:00:00
Iyear
2025
Report Number
20250121
Supplemental Number
40935
Report Type
Supplemental Final
Operator Id
4908
Name
Exxonmobil Production Company, A Division Of Exxon Mobil Corporation
Operator Street Address
22777 Springwoods Village Parkway W3.2a_upst Us Conv
Operator City Name
Spring
Operator State Abbreviation
TX
Operator Postal Code
77389
Time Zone
Mountain
Daylight Savings Ind
Yes
Location Latitude
42.3447222
Location Longitude
-107.8291667
Commodity Released Type
Co2 (Carbon Dioxide)
Unintentional Release Bbls
32
Intentional Release Bbls
0
Recovered Bbls
0
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Accident Identifier
Other
Accident Details
Another Pipeline Company Working In The Vicinity
System Part Involved
Onshore Pump/meter Station Equipment And Piping
On Off Shore
Onshore
Status When Identified
Normal Operation, Includes Pauses Between Batches And During Maintenance
Shutdown Due Accident Ind
No
Shutdown Explain
No Further Action Was Taken
Communication State Fed Ind
No
Nrc Rpt Num
1429323
Additional Nrc Report Numbers
1429466
Ignite Ind
No
Num Pub Evacuated
0
Pipe Fac Name
Wyoming Operations
Segment Name
Lb02
Onshore State Abbreviation
Wy
Onshore Postal Code
82310
Onshore City Name
Jeffrey City
Onshore County Name
Fremont
Designated Location
Survey Station No.
Designated Name
Bairoil Ms
Federal
Yes
Location Type
Totally Contained On Operator-Controlled Property
Incident Area Type
Aboveground
Incident Area Subtype
Inside A Building
Crossing
No
Pipe Facility Type
Intrastate
Item Involved
Relief Line And Relief Equipment
Installation Year
1986
Manufactured Year
1985
Material Involved
Material Other Than Carbon Steel
Material Details
Psv Seat
Release Type
Leak
Leak Type
Seal Or Packing
Wildlife Impact Ind
No
Soil Contamination
No
Long Term Assessment
No
Remediation Ind
No
Water Contam Ind
No
Could Be Hca
No
Commodity Reached Hca
No
Est Cost Oper Paid
0
Est Cost Gas Released
159
Est Cost Prop Damage
3000
Est Cost Emergency
0
Est Cost Environmental
0
Est Cost Other
0
Prpty
3159
Num Persons Hosp Not Ovnght
0
Num Injured Treated By Emt
0
Num Resident Building Affctd
0
Num Business Building Affctd
0
Accident Psig
1800
Mop Psig
2688
Mop Cfr Section
Internal Design Pressure �195.406(A)(1)
Maop Established Date
1984-01-01 00:00:00
Maop Reversal Flow Ind
No
Accident Pressure
Pressure Did Not Exceed Mop
Pressure Restriction Ind
No
Pipeline Function
> 20% Smys Regulated Transmission
Scada In Place Ind
Yes
Scada Operating Ind
Yes
Scada Functional Ind
Yes
Scada Detection Ind
No
Scada Conf Ind
Yes
Cpm In Place Ind
No
Investigation Status
No, the operator did not find that an investigation of the controller(s) actions or control room issues was necessary due to: (provide an explanation for why the operator did not investigate)
Investigation Status Details
The cause of the CO2 release was a psv failure. The psv soft goods were inspected and replaced on 4/24/25.
Employee Drug Test Ind
No
Contractor Drug Test Ind
No
Cause
Equipment Failure
Cause Details
Malfunction Of Control/relief Equipment
Eq Failure Type
Malfunction Of Control/relief Equipment
Relief Valve Ind
Yes
Additional Erosion Wear Ind
Yes
Preparer Name
A***** C*****
Preparer Title
Regulatory Specialist
Preparer Email
A**************@e*********.com
Preparer Telephone
3464749103
Prepared Date
2025-05-23 00:00:00
Local Contact Name
L***** K******
Local Contact Email
L***************@e*********.com
Local Contact Telephone
3078004296
Authorizer Name
J**** M***
Authorizer Telephone
4042907827
Authorizer Title
Wyoming Asset Manager
Authorizer Email
J***********@e*********.com
Narrative
The amount of carbon dioxide released was determined to be approximately 4500 kilograms. The pipeline was shut off and repaired, the release was secured. At approximately 1000 on april 24th, 2025, a nearby operator from contango reported to the exxonmobil pipeline team that CO2 was venting form the exxonmobil bairoil vent stack just outside the bairoil metering station building. The local pipeline team was deployed to investigate the unintentional CO2 venting. An initial report was made to the nrc reporting the release at 1045 on april 24th, 2025. The exxonmobil pipeline team arrived at the bairoil metering station and isolated the leaking psv no 3131, at approximately 1320 on april 24th, 2025. The exxonmobil contractor psv team spartan arrived and tested the psv, no obvious failures were identified so the psv was pulled, rebuilt, and put back into service on april 24th, 2025. The cause of the incident was due to a premature psv failure. Psv are tested and/or rebuilt on an annual basis as part of the maintenance program.
| Report Received Date | 2025-05-12 00:00:00 |
|---|---|
| Iyear | 2025 |
| Report Number | 20250121 |
| Supplemental Number | 40935 |
| Report Type | Supplemental Final |
| Operator Id | 4908 PHMSA Enforcement |
| Name | Exxonmobil Production Company, A Division Of Exxon Mobil Corporation |
| Operator Street Address | 22777 Springwoods Village Parkway W3.2a_upst Us Conv |
| Operator City Name | Spring |
| Operator State Abbreviation | TX |
| Operator Postal Code | 77389 |
| Time Zone | Mountain |
| Daylight Savings Ind | Yes |
| Location Latitude | 42.3447222 Google Maps OpenStreetMap |
| Location Longitude | -107.8291667 Google Maps OpenStreetMap |
| Commodity Released Type | Co2 (Carbon Dioxide) |
| Unintentional Release Bbls | 32 |
| Intentional Release Bbls | 0 |
| Recovered Bbls | 0 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Accident Identifier | Other |
| Accident Details | Another Pipeline Company Working In The Vicinity |
| System Part Involved | Onshore Pump/meter Station Equipment And Piping |
| On Off Shore | Onshore |
| Status When Identified | Normal Operation, Includes Pauses Between Batches And During Maintenance |
| Shutdown Due Accident Ind | No |
| Shutdown Explain | No Further Action Was Taken |
| Communication State Fed Ind | No |
| Nrc Rpt Num | 1429323 NRC Report How to search |
| Additional Nrc Report Numbers | 1429466 |
| Ignite Ind | No |
| Num Pub Evacuated | 0 |
| Pipe Fac Name | Wyoming Operations |
| Segment Name | Lb02 |
| Onshore State Abbreviation | Wy |
| Onshore Postal Code | 82310 |
| Onshore City Name | Jeffrey City |
| Onshore County Name | Fremont |
| Designated Location | Survey Station No. |
| Designated Name | Bairoil Ms |
| Federal | Yes |
| Location Type | Totally Contained On Operator-Controlled Property |
| Incident Area Type | Aboveground |
| Incident Area Subtype | Inside A Building |
| Crossing | No |
| Pipe Facility Type | Intrastate |
| Item Involved | Relief Line And Relief Equipment |
| Installation Year | 1986 |
| Manufactured Year | 1985 |
| Material Involved | Material Other Than Carbon Steel |
| Material Details | Psv Seat |
| Release Type | Leak |
| Leak Type | Seal Or Packing |
| Wildlife Impact Ind | No |
| Soil Contamination | No |
| Long Term Assessment | No |
| Remediation Ind | No |
| Water Contam Ind | No |
| Could Be Hca | No |
| Commodity Reached Hca | No |
| Est Cost Oper Paid | 0 |
| Est Cost Gas Released | 159 |
| Est Cost Prop Damage | 3000 |
| Est Cost Emergency | 0 |
| Est Cost Environmental | 0 |
| Est Cost Other | 0 |
| Prpty | 3159 |
| Num Persons Hosp Not Ovnght | 0 |
| Num Injured Treated By Emt | 0 |
| Num Resident Building Affctd | 0 |
| Num Business Building Affctd | 0 |
| Accident Psig | 1800 |
| Mop Psig | 2688 |
| Mop Cfr Section | Internal Design Pressure �195.406(A)(1) View CFR 49 §192 |
| Maop Established Date | 1984-01-01 00:00:00 |
| Maop Reversal Flow Ind | No |
| Accident Pressure | Pressure Did Not Exceed Mop |
| Pressure Restriction Ind | No |
| Pipeline Function | > 20% Smys Regulated Transmission |
| Scada In Place Ind | Yes |
| Scada Operating Ind | Yes |
| Scada Functional Ind | Yes |
| Scada Detection Ind | No |
| Scada Conf Ind | Yes |
| Cpm In Place Ind | No |
| Investigation Status | No, the operator did not find that an investigation of the controller(s) actions or control room issues was necessary due to: (provide an explanation for why the operator did not investigate) |
| Investigation Status Details | The cause of the CO2 release was a psv failure. The psv soft goods were inspected and replaced on 4/24/25. |
| Employee Drug Test Ind | No |
| Contractor Drug Test Ind | No |
| Cause | Equipment Failure |
| Cause Details | Malfunction Of Control/relief Equipment |
| Eq Failure Type | Malfunction Of Control/relief Equipment |
| Relief Valve Ind | Yes |
| Additional Erosion Wear Ind | Yes |
| Preparer Name | A***** C***** |
| Preparer Title | Regulatory Specialist |
| Preparer Email | A**************@e*********.com |
| Preparer Telephone | 3464749103 |
| Prepared Date | 2025-05-23 00:00:00 |
| Local Contact Name | L***** K****** |
| Local Contact Email | L***************@e*********.com |
| Local Contact Telephone | 3078004296 |
| Authorizer Name | J**** M*** |
| Authorizer Telephone | 4042907827 |
| Authorizer Title | Wyoming Asset Manager |
| Authorizer Email | J***********@e*********.com |
| Narrative | The amount of carbon dioxide released was determined to be approximately 4500 kilograms. The pipeline was shut off and repaired, the release was secured. At approximately 1000 on april 24th, 2025, a nearby operator from contango reported to the exxonmobil pipeline team that CO2 was venting form the exxonmobil bairoil vent stack just outside the bairoil metering station building. The local pipeline team was deployed to investigate the unintentional CO2 venting. An initial report was made to the nrc reporting the release at 1045 on april 24th, 2025. The exxonmobil pipeline team arrived at the bairoil metering station and isolated the leaking psv no 3131, at approximately 1320 on april 24th, 2025. The exxonmobil contractor psv team spartan arrived and tested the psv, no obvious failures were identified so the psv was pulled, rebuilt, and put back into service on april 24th, 2025. The cause of the incident was due to a premature psv failure. Psv are tested and/or rebuilt on an annual basis as part of the maintenance program. |
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