Incident details
Operator, cause, commodity and consequences with raw source fields.
GTG incident on 2025-02-14 — TX
Operator
Columbia Gas Transmission, Llc
Cause
Natural Force Damage
Commodity
Natural Gas
Program
GTG
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$0
Incident datetime
2025-02-14 00:00 UTC
Report number
Location
TX
Narrative
On january 19, 2025, tc energy confirmed an unintentional gas release at the lost river compressor station in mathias, west virginia, after a landowner reported a potential issue. Upon arrival, operations personnel observed natural gas being released to the atmosphere and confirmed the failure at 1801 est. Gas control reported a pressure drop from approximately 700 psi to 550 psig. The failure was traced to esd blow-off valve c10-90, which opened out of sequence due to below freezing ambient atmospheric temperatures, causing a pressure drop in the compressed air system. Operations manually isolated the valve by closing upstream fire valve c10-314, stopping the gas release at 1804 est. Gas control confirmed pipeline wb5 was at 502 psig at the time. The failed valve was removed, tested, and successfully cycled before being reinstalled. Tc energy will assess mitigation measures to prevent recurrence.
Detailed record list
Report Received Date
2025-02-14 00:00:00
Iyear
2025
Report Number
20250015
Supplemental Number
40656
Report Type
Supplemental Final
Operator Id
2616
Name
Columbia Gas Transmission, Llc
Operator Street Address
700 Louisiana St. Suite 700
Operator City Name
Houston
Operator State Abbreviation
TX
Operator Postal Code
77002
Time Zone
Eastern
Daylight Savings Ind
No
Location Latitude
38.877136
Location Longitude
-78.86101
Nrc Rpt Num
1421435
Additional Nrc Report Numbers
1421520
Commodity Released Type
Natural Gas
Unintentional Release
48538
Intentional Release
0
Accompanying Liquid
0
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Status When Identified
Normal Operation, Includes Pauses During Maintenance
Shutdown Due Accident Ind
No
Shutdown Explain
Closed C10-314 Manual Block Valve Below The Blow Off Valve C10-90
Communication State Fed Ind
Yes
Party Initiated Communication
Local/state/federal Emergency Responder
Ignite Ind
No
Num Pub Evacuated
0
On Off Shore
Onshore
Onshore State Abbreviation
Wv
Onshore Postal Code
26812
Onshore City Name
Mathias
Onshore County Name
Hardy
Designated Location
Not Applicable
Pipe Fac Name
Lost River Compressor Station
Segment Name
Wb5 Suction Within Lost River Compressor Station
Federal
No
Location Type
Operator-Controlled Property
Incident Area Type
Aboveground
Incident Area Subtype
Typical Aboveground Facility Piping Or Appurtenance
Crossing
No
Pipe Facility Type
Interstate
System Part Involved
Onshore Compressor Station Equipment And Piping
Item Involved
Esd System, But Excluding Product Drain Lines And Tubing
Installation Year
2007
Manufactured Year
2006
Material Involved
Carbon Steel
Release Type
Other
Release Type Details
Gas Released Through C10-90 Blow Off Valve
Class Location Type
Class 2 Location
Could Be Hca
Yes
Determination Method
Method2
Pir Radius
891
Heat Damage Ind
No
Non Heat Damage Ind
No
Est Cost Oper Paid
0
Est Cost Unintentional Release
154351
Est Cost Intentional Release
0
Est Cost Prop Damage
0
Est Cost Emergency
870
Est Cost Other
0
Gas Cost In Mcf
3.18
Prpty
155221
Num Persons Hosp Not Ovnght
0
Num Injured Treated By Emt
0
Num Resident Building Affctd
0
Num Business Building Affctd
0
Wildlife Impact Ind
No
Accident Psig
681
Gas Flow In Pipe In Mcf
1127
Mop Psig
1000
Mop Cfr Section
192.619(A)(2)
Maop Established Date
2007-04-26 00:00:00
Maop Reversal Flow Ind
No
Accident Pressure
Pressure Did Not Exceed Maop
Pressure Restriction Ind
No
Gas Required Odorized Ind
No
Pipeline Function
Transmission System
Scada In Place Ind
Yes
Scada Operating Ind
Yes
Scada Functional Ind
Yes
Scada Detection Ind
Yes
Scada Conf Ind
Yes
Accident Identifier
Notification From Public
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
No controller contribution.
Employee Drug Test Ind
No
Contractor Drug Test Ind
No
Cause
Natural Force Damage
Cause Details
Temperature
Natural Force Type
Temperature
Temperature Subtype
Frozen Components
Nf Extreme Weather Ind
No
Nf Temperature Ind
Yes
Eqf Control Releaf Ind
Yes
Preparer Name
E***** J***
Preparer Email
E**********@t*******.com
Preparer Telephone
281-906-5411
Authorizer Name
C*** B*****
Authorizer Telephone
304-541-2170
Authorizer Email
C**********@t*******.com
Narrative
On january 19, 2025, tc energy confirmed an unintentional gas release at the lost river compressor station in mathias, west virginia, after a landowner reported a potential issue. Upon arrival, operations personnel observed natural gas being released to the atmosphere and confirmed the failure at 1801 est. Gas control reported a pressure drop from approximately 700 psi to 550 psig. The failure was traced to esd blow-off valve c10-90, which opened out of sequence due to below freezing ambient atmospheric temperatures, causing a pressure drop in the compressed air system. Operations manually isolated the valve by closing upstream fire valve c10-314, stopping the gas release at 1804 est. Gas control confirmed pipeline wb5 was at 502 psig at the time. The failed valve was removed, tested, and successfully cycled before being reinstalled. Tc energy will assess mitigation measures to prevent recurrence.
| Report Received Date | 2025-02-14 00:00:00 |
|---|---|
| Iyear | 2025 |
| Report Number | 20250015 |
| Supplemental Number | 40656 |
| Report Type | Supplemental Final |
| Operator Id | 2616 PHMSA Enforcement |
| Name | Columbia Gas Transmission, Llc |
| Operator Street Address | 700 Louisiana St. Suite 700 |
| Operator City Name | Houston |
| Operator State Abbreviation | TX |
| Operator Postal Code | 77002 |
| Time Zone | Eastern |
| Daylight Savings Ind | No |
| Location Latitude | 38.877136 Google Maps OpenStreetMap |
| Location Longitude | -78.86101 Google Maps OpenStreetMap |
| Nrc Rpt Num | 1421435 NRC Report How to search |
| Additional Nrc Report Numbers | 1421520 |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 48538 |
| Intentional Release | 0 |
| Accompanying Liquid | 0 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Status When Identified | Normal Operation, Includes Pauses During Maintenance |
| Shutdown Due Accident Ind | No |
| Shutdown Explain | Closed C10-314 Manual Block Valve Below The Blow Off Valve C10-90 |
| Communication State Fed Ind | Yes |
| Party Initiated Communication | Local/state/federal Emergency Responder |
| Ignite Ind | No |
| Num Pub Evacuated | 0 |
| On Off Shore | Onshore |
| Onshore State Abbreviation | Wv |
| Onshore Postal Code | 26812 |
| Onshore City Name | Mathias |
| Onshore County Name | Hardy |
| Designated Location | Not Applicable |
| Pipe Fac Name | Lost River Compressor Station |
| Segment Name | Wb5 Suction Within Lost River Compressor Station |
| Federal | No |
| Location Type | Operator-Controlled Property |
| Incident Area Type | Aboveground |
| Incident Area Subtype | Typical Aboveground Facility Piping Or Appurtenance |
| Crossing | No |
| Pipe Facility Type | Interstate |
| System Part Involved | Onshore Compressor Station Equipment And Piping |
| Item Involved | Esd System, But Excluding Product Drain Lines And Tubing |
| Installation Year | 2007 |
| Manufactured Year | 2006 |
| Material Involved | Carbon Steel |
| Release Type | Other |
| Release Type Details | Gas Released Through C10-90 Blow Off Valve |
| Class Location Type | Class 2 Location |
| Could Be Hca | Yes |
| Determination Method | Method2 |
| Pir Radius | 891 |
| Heat Damage Ind | No |
| Non Heat Damage Ind | No |
| Est Cost Oper Paid | 0 |
| Est Cost Unintentional Release | 154351 |
| Est Cost Intentional Release | 0 |
| Est Cost Prop Damage | 0 |
| Est Cost Emergency | 870 |
| Est Cost Other | 0 |
| Gas Cost In Mcf | 3.18 |
| Prpty | 155221 |
| Num Persons Hosp Not Ovnght | 0 |
| Num Injured Treated By Emt | 0 |
| Num Resident Building Affctd | 0 |
| Num Business Building Affctd | 0 |
| Wildlife Impact Ind | No |
| Accident Psig | 681 |
| Gas Flow In Pipe In Mcf | 1127 |
| Mop Psig | 1000 |
| Mop Cfr Section | 192.619(A)(2) View CFR 49 §192 |
| Maop Established Date | 2007-04-26 00:00:00 |
| Maop Reversal Flow Ind | No |
| Accident Pressure | Pressure Did Not Exceed Maop |
| Pressure Restriction Ind | No |
| Gas Required Odorized Ind | No |
| Pipeline Function | Transmission System |
| Scada In Place Ind | Yes |
| Scada Operating Ind | Yes |
| Scada Functional Ind | Yes |
| Scada Detection Ind | Yes |
| Scada Conf Ind | Yes |
| Accident Identifier | Notification From Public |
| 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 | No controller contribution. |
| Employee Drug Test Ind | No |
| Contractor Drug Test Ind | No |
| Cause | Natural Force Damage |
| Cause Details | Temperature |
| Natural Force Type | Temperature |
| Temperature Subtype | Frozen Components |
| Nf Extreme Weather Ind | No |
| Nf Temperature Ind | Yes |
| Eqf Control Releaf Ind | Yes |
| Preparer Name | E***** J*** |
| Preparer Email | E**********@t*******.com |
| Preparer Telephone | 281-906-5411 |
| Authorizer Name | C*** B***** |
| Authorizer Telephone | 304-541-2170 |
| Authorizer Email | C**********@t*******.com |
| Narrative | On january 19, 2025, tc energy confirmed an unintentional gas release at the lost river compressor station in mathias, west virginia, after a landowner reported a potential issue. Upon arrival, operations personnel observed natural gas being released to the atmosphere and confirmed the failure at 1801 est. Gas control reported a pressure drop from approximately 700 psi to 550 psig. The failure was traced to esd blow-off valve c10-90, which opened out of sequence due to below freezing ambient atmospheric temperatures, causing a pressure drop in the compressed air system. Operations manually isolated the valve by closing upstream fire valve c10-314, stopping the gas release at 1804 est. Gas control confirmed pipeline wb5 was at 502 psig at the time. The failed valve was removed, tested, and successfully cycled before being reinstalled. Tc energy will assess mitigation measures to prevent recurrence. |
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