Incident details
Operator, cause, commodity and consequences with raw source fields.
GTG incident on 2024-06-21 — TX
Operator
Florida Gas Transmission Co
Cause
Incorrect Operation
Commodity
Natural Gas
Program
GTG
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$200
Incident datetime
2024-06-21 00:00 UTC
Report number
Location
TX
Narrative
On 05/31/2024 at 18:12, the 12-inch station discharge header blowdown inadvertently opened resulting in gas blowing at approximately 1100 psi for 78 minutes. A local emergency responder notified the control center in houston, tx. Control center called local operations management and an fgt employee was dispatched to compressor station 27 thonotosassa and found the discharge blowdown open. The employee immediately closed the manual block valve just downstream of the automatic valve. Upon further investigation, the employee found a three-way valve on the esd line in the closed position. Seals in the operator on the discharge blowdown valve had been replaced on the previous day. There are two valves inline on the esd sensing feed line. The cause of the incident was due to a valve left or placed in wrong position, but not resulting in an overpressure. Replacing 3-way-switching valve with a manual block valve in line with a manual bleed between the two block valves to prevent potential reoccurrence.
Detailed record list
Report Received Date
2024-06-21 00:00:00
Iyear
2024
Report Number
20240083
Supplemental Number
39707
Report Type
Original Final
Operator Id
5304
Name
Florida Gas Transmission Co
Operator Street Address
1300 Main Street
Operator City Name
Houston
Operator State Abbreviation
TX
Operator Postal Code
77002
Time Zone
Eastern
Daylight Savings Ind
Yes
Location Latitude
28.04385
Location Longitude
-82.30102
Nrc Rpt Num
1400505
Additional Nrc Report Numbers
1400709
Commodity Released Type
Natural Gas
Unintentional Release
56734
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
Ignite Ind
No
Num Pub Evacuated
0
On Off Shore
Onshore
Onshore State Abbreviation
Fl
Onshore Postal Code
33592
Onshore City Name
Thonotosassa
Onshore County Name
Hillsborough
Designated Location
Not Applicable
Pipe Fac Name
Compressor Station 27 Thonotosassa
Segment Name
12-Inch Blowdown Discharge Header
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
Auxiliary Or Other Valve
Installation Year
2011
Manufactured Year
2011
Material Involved
Carbon Steel
Release Type
Other
Release Type Details
Station Discharge Header Blowdown Inadvertently Opened.
Class Location Type
Class 1 Location
Could Be Hca
No
Pir Radius
1065
Heat Damage Ind
No
Non Heat Damage Ind
No
Did Occur In Mca Ind
No
Est Cost Oper Paid
0
Est Cost Unintentional Release
156019
Est Cost Intentional Release
0
Est Cost Prop Damage
200
Est Cost Emergency
0
Est Cost Other
0
Gas Cost In Mcf
2.75
Prpty
156219
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
1100
Gas Flow In Pipe In Mcf
940000
Mop Psig
1333
Mop Cfr Section
192.619(A)(2)
Maop Established Date
2011-04-01 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
No
Scada Conf Ind
No
Accident Identifier
Notification From Emergency Responder
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 did not identify controller action as a contributing factor.
Employee Drug Test Ind
No
Contractor Drug Test Ind
No
Cause
Incorrect Operation
Cause Details
Valve Left Or Placed In Wrong Position, But Not Resulting In An Overpressure
Operation Type
Valve Left Or Placed In Wrong Position, But Not Resulting In An Overpressure
Related Other Ind
Yes
Operation Related Details
No Indicators On Three-Way Ball Valve To Differentiate Blocked, Blocked And Vented, Or Open.
Category Type
Routine Maintenance
Operator Qualification Ind
Yes
Qualified Individuals
Yes, They Were Qualified For The Task(S)
Preparer Name
T*** N*******
Preparer Title
Director - Dot Compliance
Preparer Email
T************@e*************.com
Preparer Telephone
713-989-7126
Authorizer Name
T*** N*******
Authorizer Title
Director - Dot Compliance
Authorizer Telephone
713-989-7126
Authorizer Email
T************@e*************.com
Narrative
On 05/31/2024 at 18:12, the 12-inch station discharge header blowdown inadvertently opened resulting in gas blowing at approximately 1100 psi for 78 minutes. A local emergency responder notified the control center in houston, tx. Control center called local operations management and an fgt employee was dispatched to compressor station 27 thonotosassa and found the discharge blowdown open. The employee immediately closed the manual block valve just downstream of the automatic valve. Upon further investigation, the employee found a three-way valve on the esd line in the closed position. Seals in the operator on the discharge blowdown valve had been replaced on the previous day. There are two valves inline on the esd sensing feed line. The cause of the incident was due to a valve left or placed in wrong position, but not resulting in an overpressure. Replacing 3-way-switching valve with a manual block valve in line with a manual bleed between the two block valves to prevent potential reoccurrence.
| Report Received Date | 2024-06-21 00:00:00 |
|---|---|
| Iyear | 2024 |
| Report Number | 20240083 |
| Supplemental Number | 39707 |
| Report Type | Original Final |
| Operator Id | 5304 PHMSA Enforcement |
| Name | Florida Gas Transmission Co |
| Operator Street Address | 1300 Main Street |
| Operator City Name | Houston |
| Operator State Abbreviation | TX |
| Operator Postal Code | 77002 |
| Time Zone | Eastern |
| Daylight Savings Ind | Yes |
| Location Latitude | 28.04385 Google Maps OpenStreetMap |
| Location Longitude | -82.30102 Google Maps OpenStreetMap |
| Nrc Rpt Num | 1400505 NRC Report How to search |
| Additional Nrc Report Numbers | 1400709 |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 56734 |
| 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 |
| Ignite Ind | No |
| Num Pub Evacuated | 0 |
| On Off Shore | Onshore |
| Onshore State Abbreviation | Fl |
| Onshore Postal Code | 33592 |
| Onshore City Name | Thonotosassa |
| Onshore County Name | Hillsborough |
| Designated Location | Not Applicable |
| Pipe Fac Name | Compressor Station 27 Thonotosassa |
| Segment Name | 12-Inch Blowdown Discharge Header |
| 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 | Auxiliary Or Other Valve |
| Installation Year | 2011 |
| Manufactured Year | 2011 |
| Material Involved | Carbon Steel |
| Release Type | Other |
| Release Type Details | Station Discharge Header Blowdown Inadvertently Opened. |
| Class Location Type | Class 1 Location |
| Could Be Hca | No |
| Pir Radius | 1065 |
| Heat Damage Ind | No |
| Non Heat Damage Ind | No |
| Did Occur In Mca Ind | No |
| Est Cost Oper Paid | 0 |
| Est Cost Unintentional Release | 156019 |
| Est Cost Intentional Release | 0 |
| Est Cost Prop Damage | 200 |
| Est Cost Emergency | 0 |
| Est Cost Other | 0 |
| Gas Cost In Mcf | 2.75 |
| Prpty | 156219 |
| 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 | 1100 |
| Gas Flow In Pipe In Mcf | 940000 |
| Mop Psig | 1333 |
| Mop Cfr Section | 192.619(A)(2) View CFR 49 §192 |
| Maop Established Date | 2011-04-01 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 | No |
| Scada Conf Ind | No |
| Accident Identifier | Notification From Emergency Responder |
| 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 did not identify controller action as a contributing factor. |
| Employee Drug Test Ind | No |
| Contractor Drug Test Ind | No |
| Cause | Incorrect Operation |
| Cause Details | Valve Left Or Placed In Wrong Position, But Not Resulting In An Overpressure |
| Operation Type | Valve Left Or Placed In Wrong Position, But Not Resulting In An Overpressure |
| Related Other Ind | Yes |
| Operation Related Details | No Indicators On Three-Way Ball Valve To Differentiate Blocked, Blocked And Vented, Or Open. |
| Category Type | Routine Maintenance |
| Operator Qualification Ind | Yes |
| Qualified Individuals | Yes, They Were Qualified For The Task(S) |
| Preparer Name | T*** N******* |
| Preparer Title | Director - Dot Compliance |
| Preparer Email | T************@e*************.com |
| Preparer Telephone | 713-989-7126 |
| Authorizer Name | T*** N******* |
| Authorizer Title | Director - Dot Compliance |
| Authorizer Telephone | 713-989-7126 |
| Authorizer Email | T************@e*************.com |
| Narrative | On 05/31/2024 at 18:12, the 12-inch station discharge header blowdown inadvertently opened resulting in gas blowing at approximately 1100 psi for 78 minutes. A local emergency responder notified the control center in houston, tx. Control center called local operations management and an fgt employee was dispatched to compressor station 27 thonotosassa and found the discharge blowdown open. The employee immediately closed the manual block valve just downstream of the automatic valve. Upon further investigation, the employee found a three-way valve on the esd line in the closed position. Seals in the operator on the discharge blowdown valve had been replaced on the previous day. There are two valves inline on the esd sensing feed line. The cause of the incident was due to a valve left or placed in wrong position, but not resulting in an overpressure. Replacing 3-way-switching valve with a manual block valve in line with a manual bleed between the two block valves to prevent potential reoccurrence. |
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