Incident details
Operator, cause, commodity and consequences with raw source fields.
GTG incident on 2024-11-22 — TX
Operator
Tennessee Gas Pipeline Company
Cause
Equipment Failure
Commodity
Natural Gas
Program
GTG
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$60,000
Incident datetime
2024-11-22 00:00 UTC
Report number
Location
TX
Narrative
Tgp station 87 relief valve actuation resulting in a PHMSA reportable quantity of 18,390 mcf. On 10/22/2024, at approximately 7:28 pm cst, line 500 - 1x3 crossover valve prematurely closed. When the valve actuated, running engines caused elevated pressure on line 100-3 in the station yard. Units 7c and 8c shut down due to high discharge pressure seen on the unit pressure switches. To protect the system maop, the relief valve on 100-3 in the station yard also began to vent. The relief valve vented and re-set itself multiple times until it failed open due to the internal seat becoming dislodged. Line 100-3 has been isolated in the yard. Investigation underway. Supplemental report will be submitted with findings. No injuries, no oil mist released, no emergency response or road closures.
Detailed record list
Report Received Date
2024-11-22 00:00:00
Iyear
2024
Report Number
20240128
Supplemental Number
40248
Report Type
Supplemental 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
36.615833
Location Longitude
-86.559722
Nrc Rpt Num
1414436
Additional Nrc Report Numbers
1414844
Commodity Released Type
Natural Gas
Unintentional Release
18390
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
Communication State Fed Ind
No
Ignite Ind
No
Num Pub Evacuated
0
On Off Shore
Onshore
Onshore State Abbreviation
Tn
Onshore Postal Code
37148
Onshore City Name
Portland
Onshore County Name
Sumner
Designated Location
Not Applicable
Pipe Fac Name
Tgp Compressor Station 87
Segment Name
Relief Valve
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
Valve
Valve Type
Relief Valve
Installation Year
Unknown
Manufactured Year
Unknown
Material Involved
Carbon Steel
Release Type
Leak
Leak Type
Other
Leak Type Other
Internal Seat Dislodged
Class Location Type
Class 2 Location
Could Be Hca
No
Pir Radius
567
Heat Damage Ind
No
Non Heat Damage Ind
No
Did Occur In Mca Ind
No
Est Cost Oper Paid
0
Est Cost Unintentional Release
40458
Est Cost Intentional Release
0
Est Cost Prop Damage
60000
Est Cost Emergency
0
Est Cost Other
0
Gas Cost In Mcf
2.2
Prpty
100458
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
750
Gas Flow In Pipe In Mcf
2200
Mop Psig
750
Mop Cfr Section
192.619(A)(2)
Maop Established Date
1950-10-06 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
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
Yes
Contractor Drug Test Ind
No
Num Employees Tested
1
Num Employees Failed
0
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
Investigation Underway For Internal Seat Dislodged
Preparer Name
R***** B***** I*
Preparer Title
Engineer - Codes And Standards
Preparer Email
R************@k***********.com
Preparer Telephone
713-420-2324
Authorizer Name
Z*** R*****
Authorizer Title
Director - Engineering Codes And Standards
Authorizer Telephone
713-420-2609
Authorizer Email
Z**********@k***********.com
Narrative
Tgp station 87 relief valve actuation resulting in a PHMSA reportable quantity of 18,390 mcf. On 10/22/2024, at approximately 7:28 pm cst, line 500 - 1x3 crossover valve prematurely closed. When the valve actuated, running engines caused elevated pressure on line 100-3 in the station yard. Units 7c and 8c shut down due to high discharge pressure seen on the unit pressure switches. To protect the system maop, the relief valve on 100-3 in the station yard also began to vent. The relief valve vented and re-set itself multiple times until it failed open due to the internal seat becoming dislodged. Line 100-3 has been isolated in the yard. Investigation underway. Supplemental report will be submitted with findings. No injuries, no oil mist released, no emergency response or road closures.
| Report Received Date | 2024-11-22 00:00:00 |
|---|---|
| Iyear | 2024 |
| Report Number | 20240128 |
| Supplemental Number | 40248 |
| Report Type | Supplemental 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 | 36.615833 Google Maps OpenStreetMap |
| Location Longitude | -86.559722 Google Maps OpenStreetMap |
| Nrc Rpt Num | 1414436 NRC Report How to search |
| Additional Nrc Report Numbers | 1414844 |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 18390 |
| 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 |
| Communication State Fed Ind | No |
| Ignite Ind | No |
| Num Pub Evacuated | 0 |
| On Off Shore | Onshore |
| Onshore State Abbreviation | Tn |
| Onshore Postal Code | 37148 |
| Onshore City Name | Portland |
| Onshore County Name | Sumner |
| Designated Location | Not Applicable |
| Pipe Fac Name | Tgp Compressor Station 87 |
| Segment Name | Relief Valve |
| 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 | Valve |
| Valve Type | Relief Valve |
| Installation Year | Unknown |
| Manufactured Year | Unknown |
| Material Involved | Carbon Steel |
| Release Type | Leak |
| Leak Type | Other |
| Leak Type Other | Internal Seat Dislodged |
| Class Location Type | Class 2 Location |
| Could Be Hca | No |
| Pir Radius | 567 |
| Heat Damage Ind | No |
| Non Heat Damage Ind | No |
| Did Occur In Mca Ind | No |
| Est Cost Oper Paid | 0 |
| Est Cost Unintentional Release | 40458 |
| Est Cost Intentional Release | 0 |
| Est Cost Prop Damage | 60000 |
| Est Cost Emergency | 0 |
| Est Cost Other | 0 |
| Gas Cost In Mcf | 2.2 |
| Prpty | 100458 |
| 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 | 750 |
| Gas Flow In Pipe In Mcf | 2200 |
| Mop Psig | 750 |
| Mop Cfr Section | 192.619(A)(2) View CFR 49 §192 |
| Maop Established Date | 1950-10-06 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 | 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 | Yes |
| Contractor Drug Test Ind | No |
| Num Employees Tested | 1 |
| Num Employees Failed | 0 |
| 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 | Investigation Underway For Internal Seat Dislodged |
| Preparer Name | R***** B***** I* |
| Preparer Title | Engineer - Codes And Standards |
| Preparer Email | R************@k***********.com |
| Preparer Telephone | 713-420-2324 |
| Authorizer Name | Z*** R***** |
| Authorizer Title | Director - Engineering Codes And Standards |
| Authorizer Telephone | 713-420-2609 |
| Authorizer Email | Z**********@k***********.com |
| Narrative | Tgp station 87 relief valve actuation resulting in a PHMSA reportable quantity of 18,390 mcf. On 10/22/2024, at approximately 7:28 pm cst, line 500 - 1x3 crossover valve prematurely closed. When the valve actuated, running engines caused elevated pressure on line 100-3 in the station yard. Units 7c and 8c shut down due to high discharge pressure seen on the unit pressure switches. To protect the system maop, the relief valve on 100-3 in the station yard also began to vent. The relief valve vented and re-set itself multiple times until it failed open due to the internal seat becoming dislodged. Line 100-3 has been isolated in the yard. Investigation underway. Supplemental report will be submitted with findings. No injuries, no oil mist released, no emergency response or road closures. |
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