Incident details
Operator, cause, commodity and consequences with raw source fields.
GTG incident on 2022-01-23 — TX
Operator
Columbia Gas Transmission, Llc
Cause
Equipment Failure
Commodity
Natural Gas
Program
GTG
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$280
Incident datetime
2022-01-23 19:51
Report number
Location
TX
Narrative
On january 23rd, 2022, pavonia compressor station (cs) was subject to an unintentional release of natural gas (material) resulting in material loss exceeding 3,000 mcf. Pavonia is a transmission cs is located in richland county, ohio that is operated and maintained by columbia gas transmission, llc (company), a tc energy entity. At 19:51 est, a company personnel received a notification from the public of a potential release of material at pavonia cs. Company operations personnel arrived on-site at 20:04 est where the unintended release of material was identified and isolated at 20:51 est. The preliminary material loss calculations were determined to be greater than 3,000 mcf, hence, the event was reported to the national response center (nrc). The preliminary assessment determined a small control air leakage on the blow-off valve and frost in the line caused the unintentional operation of the blow-off valve. An investigation was completed, and it was confirmed that moisture in the trigger airline freezing-off is the most likely casual factor for the unintentional opening of the blow-off valve. The trigger air system for blow-off valve is a stagnate system unless a leak allows flow in the trigger airlines. A leak in the system is the most probable cause as the leak would induce flow in the trigger system and allow pressure to dissipate once a blockage exist. Valve. The initial nrc report no.1327142 and the nrc 48-hour report no.1327254 have been called-in on january 23rd and january 25th respectively. Two recommendations were issued in order to avoid future re-occurrence from taking place at this cs. They were: I) check all above grade esd trigger air piping and connections for leaks, ii) add a project to install a moisture analyzer on the air dryer. The final report will be submitted after completion of the project. The dew point monitor has been installed and a station alarm has been added to alert operation if the dew point goes too high. This project was completed on september 18, 2023.
Detailed record list
Report Received Date
2022-02-16 00:00:00
Iyear
2022
Report Number
20220014
Supplemental Number
38687
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
2022-01-23 20:04:00
Time Zone
Eastern
Daylight Savings Ind
No
Location Latitude
40.82003
Location Longitude
-82.42183
Nrc Rpt Num
1327142
Nrc Rpt Datetime
2022-01-23 21:16:00
Additional Nrc Report Numbers
1327254
Commodity Released Type
Natural Gas
Unintentional Release
14118.8
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
It Was On Esd System And Valve Was Repaired.
Communication State Fed Ind
No
Ignite Ind
No
Num Pub Evacuated
0
Incident Identified Datetime
2022-01-23 19:51:00
On Site Datetime
2022-01-23 20:04:00
On Off Shore
Onshore
Onshore State Abbreviation
Oh
Onshore Postal Code
44903
Onshore City Name
Mansfield
Onshore County Name
Richland
Pipe Fac Name
Pavonia Compressor Station
Segment Name
C 109-229
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
1991
Manufactured Year
Unknown
Material Involved
Carbon Steel
Release Type
Other
Release Type Details
Blow Off Valve On Esd System Opened Unintentionally.
Class Location Type
Class 1 Location
Could Be Hca
No
Pir Radius
200
Heat Damage Ind
No
Non Heat Damage Ind
No
Did Occur In Mca Ind
No
Est Cost Oper Paid
0
Est Cost Unintentional Release
46592
Est Cost Intentional Release
0
Est Cost Prop Damage
280
Est Cost Emergency
1200
Est Cost Other
0
Gas Cost In Mcf
3.3
Prpty
48072
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
430
Gas Flow In Pipe In Mcf
338852
Mop Psig
495
Mop Cfr Section
192.619(A)(1)
Maop Established Date
1990-10-04 00:00:00
Maop Reversal Flow Ind
No
Accident Pressure
Pressure Did Not Exceed Maop
Pressure Restriction Ind
No
Gas Required Odorized Ind
Yes
Gas Odorized Ind
Yes
Pipeline Function
Transmission System
Scada In Place Ind
Yes
Scada Operating Ind
Yes
Scada Functional Ind
Yes
Scada Detection Ind
Yes
Scada Conf Ind
No
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
The malfunction of blow off valve was not due to any involvements by gas control personnel.
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
Additional Improper Mntnce Ind
Yes
Preparer Name
K***** R****** A*******
Preparer Title
Us Regulatory Compliance Specialist
Preparer Email
K*************@t*******.com
Preparer Telephone
(304)357-2351
Authorizer Name
C*** B*****
Authorizer Title
Us Regulatory Compliance Manager East
Authorizer Telephone
(304)541-2170
Authorizer Email
C**********@t*******.com
Narrative
On january 23rd, 2022, pavonia compressor station (cs) was subject to an unintentional release of natural gas (material) resulting in material loss exceeding 3,000 mcf. Pavonia is a transmission cs is located in richland county, ohio that is operated and maintained by columbia gas transmission, llc (company), a tc energy entity. At 19:51 est, a company personnel received a notification from the public of a potential release of material at pavonia cs. Company operations personnel arrived on-site at 20:04 est where the unintended release of material was identified and isolated at 20:51 est. The preliminary material loss calculations were determined to be greater than 3,000 mcf, hence, the event was reported to the national response center (nrc). The preliminary assessment determined a small control air leakage on the blow-off valve and frost in the line caused the unintentional operation of the blow-off valve. An investigation was completed, and it was confirmed that moisture in the trigger airline freezing-off is the most likely casual factor for the unintentional opening of the blow-off valve. The trigger air system for blow-off valve is a stagnate system unless a leak allows flow in the trigger airlines. A leak in the system is the most probable cause as the leak would induce flow in the trigger system and allow pressure to dissipate once a blockage exist. Valve. The initial nrc report no.1327142 and the nrc 48-hour report no.1327254 have been called-in on january 23rd and january 25th respectively. Two recommendations were issued in order to avoid future re-occurrence from taking place at this cs. They were: I) check all above grade esd trigger air piping and connections for leaks, ii) add a project to install a moisture analyzer on the air dryer. The final report will be submitted after completion of the project. The dew point monitor has been installed and a station alarm has been added to alert operation if the dew point goes too high. This project was completed on september 18, 2023.
| Report Received Date | 2022-02-16 00:00:00 |
|---|---|
| Iyear | 2022 |
| Report Number | 20220014 |
| Supplemental Number | 38687 |
| 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 | 2022-01-23 20:04:00 |
| Time Zone | Eastern |
| Daylight Savings Ind | No |
| Location Latitude | 40.82003 Google Maps OpenStreetMap |
| Location Longitude | -82.42183 Google Maps OpenStreetMap |
| Nrc Rpt Num | 1327142 NRC Report How to search |
| Nrc Rpt Datetime | 2022-01-23 21:16:00 |
| Additional Nrc Report Numbers | 1327254 |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 14118.8 |
| 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 | It Was On Esd System And Valve Was Repaired. |
| Communication State Fed Ind | No |
| Ignite Ind | No |
| Num Pub Evacuated | 0 |
| Incident Identified Datetime | 2022-01-23 19:51:00 |
| On Site Datetime | 2022-01-23 20:04:00 |
| On Off Shore | Onshore |
| Onshore State Abbreviation | Oh |
| Onshore Postal Code | 44903 |
| Onshore City Name | Mansfield |
| Onshore County Name | Richland |
| Pipe Fac Name | Pavonia Compressor Station |
| Segment Name | C 109-229 |
| 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 | 1991 |
| Manufactured Year | Unknown |
| Material Involved | Carbon Steel |
| Release Type | Other |
| Release Type Details | Blow Off Valve On Esd System Opened Unintentionally. |
| Class Location Type | Class 1 Location |
| Could Be Hca | No |
| Pir Radius | 200 |
| Heat Damage Ind | No |
| Non Heat Damage Ind | No |
| Did Occur In Mca Ind | No |
| Est Cost Oper Paid | 0 |
| Est Cost Unintentional Release | 46592 |
| Est Cost Intentional Release | 0 |
| Est Cost Prop Damage | 280 |
| Est Cost Emergency | 1200 |
| Est Cost Other | 0 |
| Gas Cost In Mcf | 3.3 |
| Prpty | 48072 |
| 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 | 430 |
| Gas Flow In Pipe In Mcf | 338852 |
| Mop Psig | 495 |
| Mop Cfr Section | 192.619(A)(1) View CFR 49 §192 |
| Maop Established Date | 1990-10-04 00:00:00 |
| Maop Reversal Flow Ind | No |
| Accident Pressure | Pressure Did Not Exceed Maop |
| Pressure Restriction Ind | No |
| Gas Required Odorized Ind | Yes |
| Gas Odorized Ind | Yes |
| Pipeline Function | Transmission System |
| Scada In Place Ind | Yes |
| Scada Operating Ind | Yes |
| Scada Functional Ind | Yes |
| Scada Detection Ind | Yes |
| Scada Conf Ind | No |
| 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 | The malfunction of blow off valve was not due to any involvements by gas control personnel. |
| 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 |
| Additional Improper Mntnce Ind | Yes |
| Preparer Name | K***** R****** A******* |
| Preparer Title | Us Regulatory Compliance Specialist |
| Preparer Email | K*************@t*******.com |
| Preparer Telephone | (304)357-2351 |
| Authorizer Name | C*** B***** |
| Authorizer Title | Us Regulatory Compliance Manager East |
| Authorizer Telephone | (304)541-2170 |
| Authorizer Email | C**********@t*******.com |
| Narrative | On january 23rd, 2022, pavonia compressor station (cs) was subject to an unintentional release of natural gas (material) resulting in material loss exceeding 3,000 mcf. Pavonia is a transmission cs is located in richland county, ohio that is operated and maintained by columbia gas transmission, llc (company), a tc energy entity. At 19:51 est, a company personnel received a notification from the public of a potential release of material at pavonia cs. Company operations personnel arrived on-site at 20:04 est where the unintended release of material was identified and isolated at 20:51 est. The preliminary material loss calculations were determined to be greater than 3,000 mcf, hence, the event was reported to the national response center (nrc). The preliminary assessment determined a small control air leakage on the blow-off valve and frost in the line caused the unintentional operation of the blow-off valve. An investigation was completed, and it was confirmed that moisture in the trigger airline freezing-off is the most likely casual factor for the unintentional opening of the blow-off valve. The trigger air system for blow-off valve is a stagnate system unless a leak allows flow in the trigger airlines. A leak in the system is the most probable cause as the leak would induce flow in the trigger system and allow pressure to dissipate once a blockage exist. Valve. The initial nrc report no.1327142 and the nrc 48-hour report no.1327254 have been called-in on january 23rd and january 25th respectively. Two recommendations were issued in order to avoid future re-occurrence from taking place at this cs. They were: I) check all above grade esd trigger air piping and connections for leaks, ii) add a project to install a moisture analyzer on the air dryer. The final report will be submitted after completion of the project. The dew point monitor has been installed and a station alarm has been added to alert operation if the dew point goes too high. This project was completed on september 18, 2023. |
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