Incident details
Operator, cause, commodity and consequences with raw source fields.
GTG incident on 2023-12-20 — TX
Operator
Tennessee Gas Pipeline Company
Cause
Incorrect Operation
Commodity
Natural Gas
Program
GTG
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$0
Incident datetime
2023-12-20 00:00 UTC
Report number
Location
TX
Narrative
On november 27, 2023 at 11:07 (cst), station 527 in port sulphur, la experienced an emergency shut down (esd) event. The initial notification was completed by local tgp operations personnel who were onsite at the time of the event. Upon station walkthrough, it was discovered that the station block valve was not fully closed, allowing for venting of gas through the blow-down valve. At 11:20 (cst), tgp operations personnel closed the blow-down valve to stop venting of the gas. At the time of the event, both station 527 and the associated scada system were offline. The scada system was undergoing maintenance due to a flow-reversal project occurring at the station. Since this event, station 527 has remained idle. The internal investigation determined that while downloading the rtu, the esd test stand was not removed from service. Upon downloading the rtu, the station esd activated. It was determined that once the esd activated, the station block valve was not able to fully close due to a rock filter becoming clogged on the pilot gas. The gas loss due to this incident 16,319 mcf. In order to prevent reoccurrence, written procedures are being developed for taking the esd test stand out of service and for downloading the rtu safety. Additionally, the valve operator is being adjusted so that the power gas does not have redundant filtration.
Detailed record list
Report Received Date
2023-12-20 00:00:00
Iyear
2023
Report Number
20230117
Supplemental Number
39003
Report Type
Original Final
Operator Id
19160
Name
Tennessee Gas Pipeline Company
Operator Street Address
1001 Louisiana St
Operator City Name
Houston
Operator State Abbreviation
TX
Operator Postal Code
77002
Time Zone
Central
Daylight Savings Ind
Yes
Location Latitude
29.5163113
Location Longitude
-89.72930701
Nrc Rpt Num
1385229
Additional Nrc Report Numbers
1385342
Commodity Released Type
Natural Gas
Unintentional Release
16319
Intentional Release
0
Accompanying Liquid
0
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Status When Identified
Post-Construction Commissioning
Communication State Fed Ind
No
Ignite Ind
No
Num Pub Evacuated
0
On Off Shore
Onshore
Onshore State Abbreviation
La
Onshore Postal Code
70083
Onshore City Name
Port Sulphur
Onshore County Name
Plaquemines
Designated Location
Not Applicable
Pipe Fac Name
Station 527
Segment Name
Station 527
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
1964
Manufactured Year
1964
Material Involved
Carbon Steel
Release Type
Other
Release Type Details
Unexpected Esd At Compressor Station
Class Location Type
Class 1 Location
Could Be Hca
No
Pir Radius
695
Heat Damage Ind
No
Non Heat Damage Ind
No
Did Occur In Mca Ind
Yes
Mca Buildng Human Occupy Ind
Yes
Est Cost Oper Paid
0
Est Cost Unintentional Release
46346
Est Cost Intentional Release
0
Est Cost Prop Damage
0
Est Cost Emergency
0
Est Cost Other
0
Gas Cost In Mcf
2.84
Prpty
46346
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
740
Gas Flow In Pipe In Mcf
0
Mop Psig
1000
Mop Cfr Section
192.619(A)(2)
Maop Established Date
1970-07-01 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
No
Scada Functional Ind
No
Scada Detection Ind
No
Scada Conf Ind
No
Accident Identifier
Local Operating Personnel, Including Contractors
Operator Type
Operator Employee
Investigation Status
Yes, specify investigation result(s): (select all that apply)
Invest No Control Room Ind
Yes
Invest No Controller Ind
Yes
Employee Drug Test Ind
No
Contractor Drug Test Ind
No
Cause
Incorrect Operation
Cause Details
Other Incorrect Operation
Operation Type
Other Incorrect Operation
Operation Details
While Downloading The Rtu, The Esd Test Stand Was Not Removed From Service. Upon Downloading The Rtu, The Station Esd Activated.
Related No Proc Ind
Yes
Category Type
Commissioning
Operator Qualification Ind
No
Preparer Name
B***** C******
Preparer Title
Pipeline Engineer Codes And Standards
Preparer Email
B*************@k***********.com
Preparer Telephone
713-420-5629
Authorizer Name
J**** H********
Authorizer Title
Director - Engineering Codes And Standards
Authorizer Telephone
713-369-9443
Authorizer Email
J**************@k***********.com
Narrative
On november 27, 2023 at 11:07 (cst), station 527 in port sulphur, la experienced an emergency shut down (esd) event. The initial notification was completed by local tgp operations personnel who were onsite at the time of the event. Upon station walkthrough, it was discovered that the station block valve was not fully closed, allowing for venting of gas through the blow-down valve. At 11:20 (cst), tgp operations personnel closed the blow-down valve to stop venting of the gas. At the time of the event, both station 527 and the associated scada system were offline. The scada system was undergoing maintenance due to a flow-reversal project occurring at the station. Since this event, station 527 has remained idle. The internal investigation determined that while downloading the rtu, the esd test stand was not removed from service. Upon downloading the rtu, the station esd activated. It was determined that once the esd activated, the station block valve was not able to fully close due to a rock filter becoming clogged on the pilot gas. The gas loss due to this incident 16,319 mcf. In order to prevent reoccurrence, written procedures are being developed for taking the esd test stand out of service and for downloading the rtu safety. Additionally, the valve operator is being adjusted so that the power gas does not have redundant filtration.
| Report Received Date | 2023-12-20 00:00:00 |
|---|---|
| Iyear | 2023 |
| Report Number | 20230117 |
| Supplemental Number | 39003 |
| Report Type | Original Final |
| Operator Id | 19160 PHMSA Enforcement |
| Name | Tennessee Gas Pipeline Company |
| Operator Street Address | 1001 Louisiana St |
| Operator City Name | Houston |
| Operator State Abbreviation | TX |
| Operator Postal Code | 77002 |
| Time Zone | Central |
| Daylight Savings Ind | Yes |
| Location Latitude | 29.5163113 Google Maps OpenStreetMap |
| Location Longitude | -89.72930701 Google Maps OpenStreetMap |
| Nrc Rpt Num | 1385229 NRC Report How to search |
| Additional Nrc Report Numbers | 1385342 |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 16319 |
| Intentional Release | 0 |
| Accompanying Liquid | 0 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Status When Identified | Post-Construction Commissioning |
| Communication State Fed Ind | No |
| Ignite Ind | No |
| Num Pub Evacuated | 0 |
| On Off Shore | Onshore |
| Onshore State Abbreviation | La |
| Onshore Postal Code | 70083 |
| Onshore City Name | Port Sulphur |
| Onshore County Name | Plaquemines |
| Designated Location | Not Applicable |
| Pipe Fac Name | Station 527 |
| Segment Name | Station 527 |
| 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 | 1964 |
| Manufactured Year | 1964 |
| Material Involved | Carbon Steel |
| Release Type | Other |
| Release Type Details | Unexpected Esd At Compressor Station |
| Class Location Type | Class 1 Location |
| Could Be Hca | No |
| Pir Radius | 695 |
| Heat Damage Ind | No |
| Non Heat Damage Ind | No |
| Did Occur In Mca Ind | Yes |
| Mca Buildng Human Occupy Ind | Yes |
| Est Cost Oper Paid | 0 |
| Est Cost Unintentional Release | 46346 |
| Est Cost Intentional Release | 0 |
| Est Cost Prop Damage | 0 |
| Est Cost Emergency | 0 |
| Est Cost Other | 0 |
| Gas Cost In Mcf | 2.84 |
| Prpty | 46346 |
| 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 | 740 |
| Gas Flow In Pipe In Mcf | 0 |
| Mop Psig | 1000 |
| Mop Cfr Section | 192.619(A)(2) View CFR 49 §192 |
| Maop Established Date | 1970-07-01 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 | No |
| Scada Functional Ind | No |
| Scada Detection Ind | No |
| Scada Conf Ind | No |
| Accident Identifier | Local Operating Personnel, Including Contractors |
| Operator Type | Operator Employee |
| Investigation Status | Yes, specify investigation result(s): (select all that apply) |
| Invest No Control Room Ind | Yes |
| Invest No Controller Ind | Yes |
| Employee Drug Test Ind | No |
| Contractor Drug Test Ind | No |
| Cause | Incorrect Operation |
| Cause Details | Other Incorrect Operation |
| Operation Type | Other Incorrect Operation |
| Operation Details | While Downloading The Rtu, The Esd Test Stand Was Not Removed From Service. Upon Downloading The Rtu, The Station Esd Activated. |
| Related No Proc Ind | Yes |
| Category Type | Commissioning |
| Operator Qualification Ind | No |
| Preparer Name | B***** C****** |
| Preparer Title | Pipeline Engineer Codes And Standards |
| Preparer Email | B*************@k***********.com |
| Preparer Telephone | 713-420-5629 |
| Authorizer Name | J**** H******** |
| Authorizer Title | Director - Engineering Codes And Standards |
| Authorizer Telephone | 713-369-9443 |
| Authorizer Email | J**************@k***********.com |
| Narrative | On november 27, 2023 at 11:07 (cst), station 527 in port sulphur, la experienced an emergency shut down (esd) event. The initial notification was completed by local tgp operations personnel who were onsite at the time of the event. Upon station walkthrough, it was discovered that the station block valve was not fully closed, allowing for venting of gas through the blow-down valve. At 11:20 (cst), tgp operations personnel closed the blow-down valve to stop venting of the gas. At the time of the event, both station 527 and the associated scada system were offline. The scada system was undergoing maintenance due to a flow-reversal project occurring at the station. Since this event, station 527 has remained idle. The internal investigation determined that while downloading the rtu, the esd test stand was not removed from service. Upon downloading the rtu, the station esd activated. It was determined that once the esd activated, the station block valve was not able to fully close due to a rock filter becoming clogged on the pilot gas. The gas loss due to this incident 16,319 mcf. In order to prevent reoccurrence, written procedures are being developed for taking the esd test stand out of service and for downloading the rtu safety. Additionally, the valve operator is being adjusted so that the power gas does not have redundant filtration. |
External Resources
PHMSA pipeline safety insights.
Product
Features
Company
All rights reserved. Copyright © by ClearPHMSA