Incident details
Operator, cause, commodity and consequences with raw source fields.
GTG incident on 2022-06-20 — OK
Operator
Transcontinental Gas Pipe Line Company
Cause
Equipment Failure
Commodity
Natural Gas
Program
GTG
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$0
Incident datetime
2022-06-20 09:16
Report number
Location
OK
Narrative
The cause of the incident was unintended valve movement. The fuel gas blowdown valve on the turbine opened while the supply was also open. Blowdown valve is a 2-inch plug. No alarms were associated with the event. The investigation performed determined one of the contributing factors was the lack of an alarm when the blowdown valve was out of position such that the operator would not have been able to recognize the valve was out of position. Alarm installation scheduled already. Fuel gas logic and alarm installation has been completed.
Detailed record list
Report Received Date
2022-07-28 00:00:00
Iyear
2022
Report Number
20220074
Supplemental Number
37920
Report Type
Supplemental Final
Operator Id
19570
Name
Transcontinental Gas Pipe Line Company
Operator Street Address
One Williams Center Md 43-4
Operator City Name
Tulsa
Operator State Abbreviation
OK
Operator Postal Code
74172
Local Datetime
2022-06-20 09:16:00
Time Zone
Eastern
Daylight Savings Ind
Yes
Location Latitude
36.34193
Location Longitude
-79.81904
Nrc Rpt Num
1339257
Nrc Rpt Datetime
2022-06-20 10:00:00
Additional Nrc Report Numbers
1339379
Commodity Released Type
Natural Gas
Unintentional Release
3755
Intentional Release
0
Accompanying Liquid
0
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Status When Identified
Routine Shutdown
Communication State Fed Ind
No
Ignite Ind
No
Num Pub Evacuated
0
Incident Identified Datetime
2022-06-20 09:16:00
On Site Datetime
2022-06-20 09:16:00
On Off Shore
Onshore
Onshore State Abbreviation
Nc
Onshore Postal Code
27320
Onshore City Name
Reidsville
Onshore County Name
Rockingham
Designated Location
Not Applicable
Pipe Fac Name
Station 160
Segment Name
Station 160
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
Compressor
Installation Year
2003
Manufactured Year
2002
Material Involved
Carbon Steel
Release Type
Other
Release Type Details
Gas Vented Through Fuel Gas Blow-Down Valve.
Class Location Type
Class 2 Location
Could Be Hca
No
Pir Radius
1
Heat Damage Ind
No
Non Heat Damage Ind
No
Did Occur In Mca Ind
No
Est Cost Oper Paid
0
Est Cost Unintentional Release
25572
Est Cost Intentional Release
0
Est Cost Prop Damage
0
Est Cost Emergency
0
Est Cost Other
0
Gas Cost In Mcf
6.81
Prpty
25572
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
340
Gas Flow In Pipe In Mcf
7069
Mop Psig
860
Mop Cfr Section
192.619(A)(1)
Maop Established Date
2021-02-13 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
No
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
The investigation performed determined one of the contributing factors was the lack of an alarm when the blowdown valve was out of position such that the operator would not have been able to recognize the valve was out of position.
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
Eq Additional Other Ind
Yes
Eq Additional Other Details
Unintended Valve Movement
Preparer Name
D*** O********
Preparer Title
Pipeline Safety Engineer
Preparer Email
D*************@w*******.com
Preparer Telephone
2816608503
Authorizer Name
J*** B***
Authorizer Title
Manager Pipeline Safety
Authorizer Telephone
3373179145
Authorizer Email
J********@w*******.com
Narrative
The cause of the incident was unintended valve movement. The fuel gas blowdown valve on the turbine opened while the supply was also open. Blowdown valve is a 2-inch plug. No alarms were associated with the event. The investigation performed determined one of the contributing factors was the lack of an alarm when the blowdown valve was out of position such that the operator would not have been able to recognize the valve was out of position. Alarm installation scheduled already. Fuel gas logic and alarm installation has been completed.
| Report Received Date | 2022-07-28 00:00:00 |
|---|---|
| Iyear | 2022 |
| Report Number | 20220074 |
| Supplemental Number | 37920 |
| Report Type | Supplemental Final |
| Operator Id | 19570 PHMSA Enforcement |
| Name | Transcontinental Gas Pipe Line Company |
| Operator Street Address | One Williams Center Md 43-4 |
| Operator City Name | Tulsa |
| Operator State Abbreviation | OK |
| Operator Postal Code | 74172 |
| Local Datetime | 2022-06-20 09:16:00 |
| Time Zone | Eastern |
| Daylight Savings Ind | Yes |
| Location Latitude | 36.34193 Google Maps OpenStreetMap |
| Location Longitude | -79.81904 Google Maps OpenStreetMap |
| Nrc Rpt Num | 1339257 NRC Report How to search |
| Nrc Rpt Datetime | 2022-06-20 10:00:00 |
| Additional Nrc Report Numbers | 1339379 |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 3755 |
| Intentional Release | 0 |
| Accompanying Liquid | 0 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Status When Identified | Routine Shutdown |
| Communication State Fed Ind | No |
| Ignite Ind | No |
| Num Pub Evacuated | 0 |
| Incident Identified Datetime | 2022-06-20 09:16:00 |
| On Site Datetime | 2022-06-20 09:16:00 |
| On Off Shore | Onshore |
| Onshore State Abbreviation | Nc |
| Onshore Postal Code | 27320 |
| Onshore City Name | Reidsville |
| Onshore County Name | Rockingham |
| Designated Location | Not Applicable |
| Pipe Fac Name | Station 160 |
| Segment Name | Station 160 |
| 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 | Compressor |
| Installation Year | 2003 |
| Manufactured Year | 2002 |
| Material Involved | Carbon Steel |
| Release Type | Other |
| Release Type Details | Gas Vented Through Fuel Gas Blow-Down Valve. |
| Class Location Type | Class 2 Location |
| Could Be Hca | No |
| Pir Radius | 1 |
| Heat Damage Ind | No |
| Non Heat Damage Ind | No |
| Did Occur In Mca Ind | No |
| Est Cost Oper Paid | 0 |
| Est Cost Unintentional Release | 25572 |
| Est Cost Intentional Release | 0 |
| Est Cost Prop Damage | 0 |
| Est Cost Emergency | 0 |
| Est Cost Other | 0 |
| Gas Cost In Mcf | 6.81 |
| Prpty | 25572 |
| 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 | 340 |
| Gas Flow In Pipe In Mcf | 7069 |
| Mop Psig | 860 |
| Mop Cfr Section | 192.619(A)(1) View CFR 49 §192 |
| Maop Established Date | 2021-02-13 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 | No |
| 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 | The investigation performed determined one of the contributing factors was the lack of an alarm when the blowdown valve was out of position such that the operator would not have been able to recognize the valve was out of position. |
| 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 |
| Eq Additional Other Ind | Yes |
| Eq Additional Other Details | Unintended Valve Movement |
| Preparer Name | D*** O******** |
| Preparer Title | Pipeline Safety Engineer |
| Preparer Email | D*************@w*******.com |
| Preparer Telephone | 2816608503 |
| Authorizer Name | J*** B*** |
| Authorizer Title | Manager Pipeline Safety |
| Authorizer Telephone | 3373179145 |
| Authorizer Email | J********@w*******.com |
| Narrative | The cause of the incident was unintended valve movement. The fuel gas blowdown valve on the turbine opened while the supply was also open. Blowdown valve is a 2-inch plug. No alarms were associated with the event. The investigation performed determined one of the contributing factors was the lack of an alarm when the blowdown valve was out of position such that the operator would not have been able to recognize the valve was out of position. Alarm installation scheduled already. Fuel gas logic and alarm installation has been completed. |
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