Incident details
Operator, cause, commodity and consequences with raw source fields.
GTG incident on 2023-02-15 — TX
Operator
Florida Gas Transmission Co
Cause
Equipment Failure
Commodity
Natural Gas
Program
GTG
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$0
Incident datetime
2023-02-15 00:00 UTC
Report number
Location
TX
Narrative
On january 16, 2023, at approximately 07:00, a florida gas transmission technician discovered a compressor unit vent valve was venting natural gas to atmosphere at the compressor station 24, near trenton, fl. The technician isolated the compressor at approximately 0730 hrs. According to company scada, the vent valve had begun venting at approximately 13:00 on january 15, 2023, but no other scada alarms were triggered. The unit was shut down remotely by gas control at 11:00 on january 15, 2023. The compressor unit automatically vents after two (2) hours of shutdown. The shutdown and all valve positions indicated closure; therefore, no alarms were triggered. The volume released was calculated to be approximately 102.6 mmscf natural gas. The determination time for this estimate was approximately 14:52 on january 16, 2023, which was followed by the nrc notification that occurred at approximately 15:44. The cause of the incident was later confirmed to be a suction side isolation valve not fully seating after the compressor unit was shutdown. Specifically, it appears that the valve actuator malfunctioned resulting in the valve not fully seating, thereby allowing pipeline pressure to bleed by into the compressor unit causing the natural gas to be vented to atmosphere. The suction side valve was fully closed manually by the technician to stop flow of gas through the compressor. The logic to allow more time for valve closure was developed and installed the day of the rcfa investigation to prevent recurrence.
Detailed record list
Report Received Date
2023-02-15 00:00:00
Iyear
2023
Report Number
20230017
Supplemental Number
38123
Report Type
Supplemental 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
No
Location Latitude
29.66381
Location Longitude
-82.84643
Nrc Rpt Num
1357823
Additional Nrc Report Numbers
1357998, 1357995
Commodity Released Type
Natural Gas
Unintentional Release
102600
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
No
Shutdown Explain
Affected Compressor Was Isolated. System Continued To Run With Separate Unit.
Communication State Fed Ind
No
Ignite Ind
No
Num Pub Evacuated
0
On Off Shore
Onshore
Onshore State Abbreviation
Fl
Onshore Postal Code
32693
Onshore City Name
Trenton
Onshore County Name
Gilchrist
Designated Location
Survey Station No.
Designated Name
1336+27
Pipe Fac Name
Florida Gas Transmission Company
Segment Name
Compressor Station 24 Trenton (F0442)
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
2000
Manufactured Year
2000
Material Involved
Carbon Steel
Release Type
Other
Release Type Details
Suction Valve Actuator Malfunction Which Led To Compressor Unit Venting Through A Blowdown Valve.
Class Location Type
Class 1 Location
Could Be Hca
No
Pir Radius
737
Heat Damage Ind
No
Non Heat Damage Ind
No
Did Occur In Mca Ind
No
Est Cost Oper Paid
0
Est Cost Unintentional Release
400140
Est Cost Intentional Release
0
Est Cost Prop Damage
0
Est Cost Emergency
0
Est Cost Other
1000
Est Cost Other Details
Operator Man-Hours
Gas Cost In Mcf
3.9
Prpty
401140
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
1100
Mop Psig
1268
Mop Cfr Section
192.619(A)(1)
Maop Established Date
2020-10-01 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
No
Scada Conf Ind
Yes
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 did not identify controller action as a contributing factor.
Employee Drug Test Ind
No
Contractor Drug Test Ind
No
Cause
Equipment Failure
Cause Details
Compressor Or Compressor-Related Equipment
Eq Failure Type
Compressor Or Compressor-Related Equipment
Other Compressor Ind
Other
Other Compressor Details
Suction Valve Actuator Malfunction
Eq Additional Other Ind
Yes
Eq Additional Other Details
Inadequate Plc Logic For Valve Actuator
Preparer Name
M*** B*****
Preparer Title
Lead Specialist Dot Compliance
Preparer Email
M**********@e*************.com
Preparer Telephone
337-451-2944
Authorizer Name
T*** N*******
Authorizer Title
Director - Regulatory Compliance
Authorizer Telephone
713-989-7126
Authorizer Email
T************@e*************.com
Narrative
On january 16, 2023, at approximately 07:00, a florida gas transmission technician discovered a compressor unit vent valve was venting natural gas to atmosphere at the compressor station 24, near trenton, fl. The technician isolated the compressor at approximately 0730 hrs. According to company scada, the vent valve had begun venting at approximately 13:00 on january 15, 2023, but no other scada alarms were triggered. The unit was shut down remotely by gas control at 11:00 on january 15, 2023. The compressor unit automatically vents after two (2) hours of shutdown. The shutdown and all valve positions indicated closure; therefore, no alarms were triggered. The volume released was calculated to be approximately 102.6 mmscf natural gas. The determination time for this estimate was approximately 14:52 on january 16, 2023, which was followed by the nrc notification that occurred at approximately 15:44. The cause of the incident was later confirmed to be a suction side isolation valve not fully seating after the compressor unit was shutdown. Specifically, it appears that the valve actuator malfunctioned resulting in the valve not fully seating, thereby allowing pipeline pressure to bleed by into the compressor unit causing the natural gas to be vented to atmosphere. The suction side valve was fully closed manually by the technician to stop flow of gas through the compressor. The logic to allow more time for valve closure was developed and installed the day of the rcfa investigation to prevent recurrence.
| Report Received Date | 2023-02-15 00:00:00 |
|---|---|
| Iyear | 2023 |
| Report Number | 20230017 |
| Supplemental Number | 38123 |
| Report Type | Supplemental 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 | No |
| Location Latitude | 29.66381 Google Maps OpenStreetMap |
| Location Longitude | -82.84643 Google Maps OpenStreetMap |
| Nrc Rpt Num | 1357823 NRC Report How to search |
| Additional Nrc Report Numbers | 1357998, 1357995 |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 102600 |
| 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 | No |
| Shutdown Explain | Affected Compressor Was Isolated. System Continued To Run With Separate Unit. |
| Communication State Fed Ind | No |
| Ignite Ind | No |
| Num Pub Evacuated | 0 |
| On Off Shore | Onshore |
| Onshore State Abbreviation | Fl |
| Onshore Postal Code | 32693 |
| Onshore City Name | Trenton |
| Onshore County Name | Gilchrist |
| Designated Location | Survey Station No. |
| Designated Name | 1336+27 |
| Pipe Fac Name | Florida Gas Transmission Company |
| Segment Name | Compressor Station 24 Trenton (F0442) |
| 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 | 2000 |
| Manufactured Year | 2000 |
| Material Involved | Carbon Steel |
| Release Type | Other |
| Release Type Details | Suction Valve Actuator Malfunction Which Led To Compressor Unit Venting Through A Blowdown Valve. |
| Class Location Type | Class 1 Location |
| Could Be Hca | No |
| Pir Radius | 737 |
| Heat Damage Ind | No |
| Non Heat Damage Ind | No |
| Did Occur In Mca Ind | No |
| Est Cost Oper Paid | 0 |
| Est Cost Unintentional Release | 400140 |
| Est Cost Intentional Release | 0 |
| Est Cost Prop Damage | 0 |
| Est Cost Emergency | 0 |
| Est Cost Other | 1000 |
| Est Cost Other Details | Operator Man-Hours |
| Gas Cost In Mcf | 3.9 |
| Prpty | 401140 |
| 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 | 1100 |
| Mop Psig | 1268 |
| Mop Cfr Section | 192.619(A)(1) View CFR 49 §192 |
| Maop Established Date | 2020-10-01 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 | No |
| Scada Conf Ind | Yes |
| 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 did not identify controller action as a contributing factor. |
| Employee Drug Test Ind | No |
| Contractor Drug Test Ind | No |
| Cause | Equipment Failure |
| Cause Details | Compressor Or Compressor-Related Equipment |
| Eq Failure Type | Compressor Or Compressor-Related Equipment |
| Other Compressor Ind | Other |
| Other Compressor Details | Suction Valve Actuator Malfunction |
| Eq Additional Other Ind | Yes |
| Eq Additional Other Details | Inadequate Plc Logic For Valve Actuator |
| Preparer Name | M*** B***** |
| Preparer Title | Lead Specialist Dot Compliance |
| Preparer Email | M**********@e*************.com |
| Preparer Telephone | 337-451-2944 |
| Authorizer Name | T*** N******* |
| Authorizer Title | Director - Regulatory Compliance |
| Authorizer Telephone | 713-989-7126 |
| Authorizer Email | T************@e*************.com |
| Narrative | On january 16, 2023, at approximately 07:00, a florida gas transmission technician discovered a compressor unit vent valve was venting natural gas to atmosphere at the compressor station 24, near trenton, fl. The technician isolated the compressor at approximately 0730 hrs. According to company scada, the vent valve had begun venting at approximately 13:00 on january 15, 2023, but no other scada alarms were triggered. The unit was shut down remotely by gas control at 11:00 on january 15, 2023. The compressor unit automatically vents after two (2) hours of shutdown. The shutdown and all valve positions indicated closure; therefore, no alarms were triggered. The volume released was calculated to be approximately 102.6 mmscf natural gas. The determination time for this estimate was approximately 14:52 on january 16, 2023, which was followed by the nrc notification that occurred at approximately 15:44. The cause of the incident was later confirmed to be a suction side isolation valve not fully seating after the compressor unit was shutdown. Specifically, it appears that the valve actuator malfunctioned resulting in the valve not fully seating, thereby allowing pipeline pressure to bleed by into the compressor unit causing the natural gas to be vented to atmosphere. The suction side valve was fully closed manually by the technician to stop flow of gas through the compressor. The logic to allow more time for valve closure was developed and installed the day of the rcfa investigation to prevent recurrence. |
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