Incident details
Operator, cause, commodity and consequences with raw source fields.
GTG incident on 2021-11-19 — TX
Operator
Columbia Gas Transmission, Llc
Cause
Equipment Failure
Commodity
Natural Gas
Program
GTG
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$125
Incident datetime
2021-11-19 01:20
Report number
Location
TX
Narrative
Coco compressor station's emergency shutdown system (esd) blowdown valve (6"- bdv#:197) unintentionally opened at 1:02am on november 19, 2021 and released 4370 mcf of natural gas through the esd blow-down stack for approximately18 minutes before the valve was manually closed. The operating pressure at the time of the release was 916 psig. The station operator was on-site during the event and was able to isolate the station piping and stop the release. As part of the preliminary investigation, ice/moisture was found in the pilot control valve of the blow-down actuator valve, potentially caused the event. The isolated esd facilities were returned back to service at 4:01 am est after the pilot control valve associated sensing lines were cleared of moisture/ice and inspected.
Detailed record list
Report Received Date
2021-12-14 00:00:00
Iyear
2021
Report Number
20210115
Supplemental Number
36140
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
Local Datetime
2021-11-19 01:20:00
Time Zone
Eastern
Daylight Savings Ind
Yes
Location Latitude
38.401907
Location Longitude
-81.41727
Nrc Rpt Num
1322483
Nrc Rpt Datetime
2021-11-19 03:21:00
Additional Nrc Report Numbers
1322509
Commodity Released Type
Natural Gas
Unintentional Release
4370
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
Yes
Shutdown Datetime
2021-11-19 01:38:00
Restart Datetime
2021-11-19 04:01:00
Communication State Fed Ind
No
Ignite Ind
No
Num Pub Evacuated
0
Incident Identified Datetime
2021-11-19 01:20:00
On Site Datetime
2021-11-19 01:50:00
On Off Shore
Onshore
Onshore State Abbreviation
Wv
Onshore Postal Code
25156
Onshore City Name
Pinch
Onshore County Name
Kanawha
Designated Location
Not Applicable
Pipe Fac Name
Coco 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
Unknown
Manufactured Year
Unknown
Material Involved
Carbon Steel
Release Type
Other
Release Type Details
Release Involved An Emergency Shutdown System (Esd) Blow-Down Valve And Blow-Off Stack, Design To Safely Evacuate Gas From The Station.
Class Location Type
Class 2 Location
Could Be Hca
No
Pir Radius
276
Heat Damage Ind
No
Non Heat Damage Ind
No
Did Occur In Mca Ind
No
Est Cost Oper Paid
0
Est Cost Unintentional Release
24297
Est Cost Intentional Release
0
Est Cost Prop Damage
125
Est Cost Emergency
350
Est Cost Other
0
Gas Cost In Mcf
5.56
Prpty
24772
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
916
Gas Flow In Pipe In Mcf
0
Mop Psig
1000
Mop Cfr Section
192.619(A)(1)
Maop Established Date
2007-11-30 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 In Storage Field
Scada In Place Ind
Yes
Scada Operating Ind
Yes
Scada Functional Ind
Yes
Scada Detection Ind
Yes
Scada Conf Ind
No
Accident Identifier
Local Operating Personnel, Including Contractors
Operator Type
Operator Employee
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
Investigation was not deemed necessary based on having an operator/responder (employee) on-site during the event and actions of the control room played a minor role during the response efforts.
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
Esd System Failure Ind
Yes
Eq Additional Other Ind
Yes
Eq Additional Other Details
Possibly Moisture In The Valve Actuator Sensing Line.
Preparer Name
C********** L L***
Preparer Title
Us Regulatory Compliance Specialist
Preparer Email
C*********@t*******.com
Preparer Telephone
304-545-4350
Local Contact Name
C********** L L***
Local Contact Email
C*********@t*******.com
Local Contact Telephone
304-545-4350
Authorizer Name
L** R*****
Authorizer Title
Director Us Regulatory Compliance
Authorizer Telephone
832-320-5315
Authorizer Email
L*********@t*******.com
Narrative
Coco compressor station's emergency shutdown system (esd) blowdown valve (6"- bdv#:197) unintentionally opened at 1:02am on november 19, 2021 and released 4370 mcf of natural gas through the esd blow-down stack for approximately18 minutes before the valve was manually closed. The operating pressure at the time of the release was 916 psig. The station operator was on-site during the event and was able to isolate the station piping and stop the release. As part of the preliminary investigation, ice/moisture was found in the pilot control valve of the blow-down actuator valve, potentially caused the event. The isolated esd facilities were returned back to service at 4:01 am est after the pilot control valve associated sensing lines were cleared of moisture/ice and inspected.
| Report Received Date | 2021-12-14 00:00:00 |
|---|---|
| Iyear | 2021 |
| Report Number | 20210115 |
| Supplemental Number | 36140 |
| 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 |
| Local Datetime | 2021-11-19 01:20:00 |
| Time Zone | Eastern |
| Daylight Savings Ind | Yes |
| Location Latitude | 38.401907 Google Maps OpenStreetMap |
| Location Longitude | -81.41727 Google Maps OpenStreetMap |
| Nrc Rpt Num | 1322483 NRC Report How to search |
| Nrc Rpt Datetime | 2021-11-19 03:21:00 |
| Additional Nrc Report Numbers | 1322509 |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 4370 |
| 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 | Yes |
| Shutdown Datetime | 2021-11-19 01:38:00 |
| Restart Datetime | 2021-11-19 04:01:00 |
| Communication State Fed Ind | No |
| Ignite Ind | No |
| Num Pub Evacuated | 0 |
| Incident Identified Datetime | 2021-11-19 01:20:00 |
| On Site Datetime | 2021-11-19 01:50:00 |
| On Off Shore | Onshore |
| Onshore State Abbreviation | Wv |
| Onshore Postal Code | 25156 |
| Onshore City Name | Pinch |
| Onshore County Name | Kanawha |
| Designated Location | Not Applicable |
| Pipe Fac Name | Coco 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 | Unknown |
| Manufactured Year | Unknown |
| Material Involved | Carbon Steel |
| Release Type | Other |
| Release Type Details | Release Involved An Emergency Shutdown System (Esd) Blow-Down Valve And Blow-Off Stack, Design To Safely Evacuate Gas From The Station. |
| Class Location Type | Class 2 Location |
| Could Be Hca | No |
| Pir Radius | 276 |
| Heat Damage Ind | No |
| Non Heat Damage Ind | No |
| Did Occur In Mca Ind | No |
| Est Cost Oper Paid | 0 |
| Est Cost Unintentional Release | 24297 |
| Est Cost Intentional Release | 0 |
| Est Cost Prop Damage | 125 |
| Est Cost Emergency | 350 |
| Est Cost Other | 0 |
| Gas Cost In Mcf | 5.56 |
| Prpty | 24772 |
| 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 | 916 |
| Gas Flow In Pipe In Mcf | 0 |
| Mop Psig | 1000 |
| Mop Cfr Section | 192.619(A)(1) View CFR 49 §192 |
| Maop Established Date | 2007-11-30 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 In Storage Field |
| Scada In Place Ind | Yes |
| Scada Operating Ind | Yes |
| Scada Functional Ind | Yes |
| Scada Detection Ind | Yes |
| Scada Conf Ind | No |
| Accident Identifier | Local Operating Personnel, Including Contractors |
| Operator Type | Operator Employee |
| 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 | Investigation was not deemed necessary based on having an operator/responder (employee) on-site during the event and actions of the control room played a minor role during the response efforts. |
| 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 |
| Esd System Failure Ind | Yes |
| Eq Additional Other Ind | Yes |
| Eq Additional Other Details | Possibly Moisture In The Valve Actuator Sensing Line. |
| Preparer Name | C********** L L*** |
| Preparer Title | Us Regulatory Compliance Specialist |
| Preparer Email | C*********@t*******.com |
| Preparer Telephone | 304-545-4350 |
| Local Contact Name | C********** L L*** |
| Local Contact Email | C*********@t*******.com |
| Local Contact Telephone | 304-545-4350 |
| Authorizer Name | L** R***** |
| Authorizer Title | Director Us Regulatory Compliance |
| Authorizer Telephone | 832-320-5315 |
| Authorizer Email | L*********@t*******.com |
| Narrative | Coco compressor station's emergency shutdown system (esd) blowdown valve (6"- bdv#:197) unintentionally opened at 1:02am on november 19, 2021 and released 4370 mcf of natural gas through the esd blow-down stack for approximately18 minutes before the valve was manually closed. The operating pressure at the time of the release was 916 psig. The station operator was on-site during the event and was able to isolate the station piping and stop the release. As part of the preliminary investigation, ice/moisture was found in the pilot control valve of the blow-down actuator valve, potentially caused the event. The isolated esd facilities were returned back to service at 4:01 am est after the pilot control valve associated sensing lines were cleared of moisture/ice and inspected. |
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