Incident details
Operator, cause, commodity and consequences with raw source fields.
GTG incident on 2025-07-17 — TX
Operator
Tennessee Gas Pipeline Company
Cause
Equipment Failure
Commodity
Natural Gas
Program
GTG
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$100
Incident datetime
2025-07-17 00:00 UTC
Report number
Location
TX
Narrative
On june 18, 2025, natural gas was vented to the atmosphere through the blowdown stacks at tennessee gas pipeline�s (tgp) compressor station 856 in savannah, tennessee. The station�s emergency shutdown (esd) system was activated, resulting in the closure of the discharge-side isolation valve. Tgp is conducting an internal investigation, including a root cause analysis (rca), to determine the cause of the discharge valve malfunction. Additional details will be provided upon completion of the investigation in a supplemental final report.
Detailed record list
Report Received Date
2025-07-17 00:00:00
Iyear
2025
Report Number
20250083
Supplemental Number
41156
Report Type
Original
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
35.159331
Location Longitude
-88.220823
Nrc Rpt Num
1434462
Additional Nrc Report Numbers
1434577
Commodity Released Type
Natural Gas
Unintentional Release
70722
Intentional Release
0
Accompanying Liquid
0
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Status When Identified
Idle
Communication State Fed Ind
Yes
Party Initiated Communication
Operator
Ignite Ind
No
Num Pub Evacuated
0
On Off Shore
Onshore
Onshore State Abbreviation
Tn
Onshore Postal Code
38372
Onshore City Name
Savannah
Onshore County Name
Hardin
Designated Location
Survey Station No.
Designated Name
Cs 856
Pipe Fac Name
Tennessee Gas Pipeline
Segment Name
Cs 856
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
Esd Valve
Class Location Type
Class 2 Location
Could Be Hca
No
Pir Radius
507
Heat Damage Ind
No
Non Heat Damage Ind
No
Did Occur In Mca Ind
No
Est Cost Oper Paid
0
Est Cost Unintentional Release
281474
Est Cost Intentional Release
0
Est Cost Prop Damage
100
Est Cost Emergency
0
Est Cost Other
0
Gas Cost In Mcf
3.98
Prpty
281574
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
859
Gas Flow In Pipe In Mcf
0
Mop Psig
936
Mop Cfr Section
Other
Mop Cfr Section Details
Need To Research
Maop Established Date
1982-07-01 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
Yes
Scada Functional Ind
Yes
Scada Detection Ind
Yes
Scada Conf Ind
Yes
Accident Identifier
Scada-Based Information (Such As Alarm(S), Alert(S), Event(S), And/or Volume Or Pack Calculations)
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
Gas controller's actions did not contribute to the release of gas via esd system.
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
Under Internal Investigation At This Time
Preparer Name
V****** B******
Preparer Title
Pipeline Engineer
Preparer Email
V**************@k***********.com
Authorizer Name
V* B******
Authorizer Telephone
8328328494
Authorizer Email
V**************@k***********.com
Narrative
On june 18, 2025, natural gas was vented to the atmosphere through the blowdown stacks at tennessee gas pipeline�s (tgp) compressor station 856 in savannah, tennessee. The station�s emergency shutdown (esd) system was activated, resulting in the closure of the discharge-side isolation valve. Tgp is conducting an internal investigation, including a root cause analysis (rca), to determine the cause of the discharge valve malfunction. Additional details will be provided upon completion of the investigation in a supplemental final report.
| Report Received Date | 2025-07-17 00:00:00 |
|---|---|
| Iyear | 2025 |
| Report Number | 20250083 |
| Supplemental Number | 41156 |
| Report Type | Original |
| 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 | 35.159331 Google Maps OpenStreetMap |
| Location Longitude | -88.220823 Google Maps OpenStreetMap |
| Nrc Rpt Num | 1434462 NRC Report How to search |
| Additional Nrc Report Numbers | 1434577 |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 70722 |
| Intentional Release | 0 |
| Accompanying Liquid | 0 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Status When Identified | Idle |
| Communication State Fed Ind | Yes |
| Party Initiated Communication | Operator |
| Ignite Ind | No |
| Num Pub Evacuated | 0 |
| On Off Shore | Onshore |
| Onshore State Abbreviation | Tn |
| Onshore Postal Code | 38372 |
| Onshore City Name | Savannah |
| Onshore County Name | Hardin |
| Designated Location | Survey Station No. |
| Designated Name | Cs 856 |
| Pipe Fac Name | Tennessee Gas Pipeline |
| Segment Name | Cs 856 |
| 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 | Esd Valve |
| Class Location Type | Class 2 Location |
| Could Be Hca | No |
| Pir Radius | 507 |
| Heat Damage Ind | No |
| Non Heat Damage Ind | No |
| Did Occur In Mca Ind | No |
| Est Cost Oper Paid | 0 |
| Est Cost Unintentional Release | 281474 |
| Est Cost Intentional Release | 0 |
| Est Cost Prop Damage | 100 |
| Est Cost Emergency | 0 |
| Est Cost Other | 0 |
| Gas Cost In Mcf | 3.98 |
| Prpty | 281574 |
| 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 | 859 |
| Gas Flow In Pipe In Mcf | 0 |
| Mop Psig | 936 |
| Mop Cfr Section | Other View CFR 49 §192 |
| Mop Cfr Section Details | Need To Research |
| Maop Established Date | 1982-07-01 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 | Yes |
| Scada Functional Ind | Yes |
| Scada Detection Ind | Yes |
| Scada Conf Ind | Yes |
| Accident Identifier | Scada-Based Information (Such As Alarm(S), Alert(S), Event(S), And/or Volume Or Pack Calculations) |
| 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 | Gas controller's actions did not contribute to the release of gas via esd system. |
| 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 | Under Internal Investigation At This Time |
| Preparer Name | V****** B****** |
| Preparer Title | Pipeline Engineer |
| Preparer Email | V**************@k***********.com |
| Authorizer Name | V* B****** |
| Authorizer Telephone | 8328328494 |
| Authorizer Email | V**************@k***********.com |
| Narrative | On june 18, 2025, natural gas was vented to the atmosphere through the blowdown stacks at tennessee gas pipeline�s (tgp) compressor station 856 in savannah, tennessee. The station�s emergency shutdown (esd) system was activated, resulting in the closure of the discharge-side isolation valve. Tgp is conducting an internal investigation, including a root cause analysis (rca), to determine the cause of the discharge valve malfunction. Additional details will be provided upon completion of the investigation in a supplemental final report. |
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