Incident details
Operator, cause, commodity and consequences with raw source fields.
GTG incident on 2011-06-10 — TX
Operator
Trunkline Gas Co
Cause
Corrosion Failure
Commodity
Natural Gas
Program
GTG
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$1,452,000
Incident datetime
2011-06-10 15:06
Report number
Location
TX
Narrative
This pipeline leak was reported to tgc gas control center at 1506 hrs. By a local oilfield operator working for an unidentified producer in the area. This operator was working from a float plane and flew over the leak location. Gas control contacted the local operations personnel who dispatched a helicopter to the location to verify the report. Upon arrival the local personnel confirmed the leak and was able to land near the downstream valve setting and close the isolation valve. Once additional personnel arrived on location the helicopter was dispatched offshore to vr 26b and the upstream isolation valve closed and the pipeline was shut in at 1701 hrs. And pressurization process commenced. During the depressurization process the pipeline began to leak condensate. Tgc personnel immediately dispatched an local osro to the location to isolate the release and begin clean-up operations. Once the release was contained pipeline repair resources were mobilized and an attempt was made to excavate the pipeline. Because of the depth of the pipe and the unstable soil conditions the decision was made to bring in a geotechnical engineering contractor to perform soil analysis and provide an excavation shoring system to meet osha regulations. The investigation and repair operation are on hold until the shoring system is available and can be installed to allow safe entrance into the excavation. This line was abandoned following the investigation into repairing the pipeline. The cost and difficulty of repair were the attributing factors for the decision.
Detailed record list
Report Received Date
2011-07-06 00:00:00
Iyear
2011
Report Number
20110227
Supplemental Number
16047
Report Type
Supplemental Final
Operator Id
19730
Name
Trunkline Gas Co
Operator Street Address
1300 Main Street
Operator City Name
Houston
Operator State Abbreviation
TX
Operator Postal Code
77002
Local Datetime
2011-06-10 13:37:00
Location Latitude
29.53595
Location Longitude
-92.33078
Nrc Rpt Num
979305
Nrc Rpt Datetime
2011-06-10 15:38:00
Commodity Released Type
Natural Gas
Unintentional Release
5000
Intentional Release
7152
Accompanying Liquid
120
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Shutdown Due Accident Ind
Yes
Shutdown Datetime
2011-06-10 17:01:00
Still Shutdown Ind
Yes
Ignite Ind
No
Explode Ind
No
Num Pub Evacuated
0
Incident Identified Datetime
2011-06-10 15:06:00
On Site Datetime
2011-06-10 16:25:00
On Off Shore
Onshore
Onshore State Abbreviation
La
Onshore Postal Code
70548
Onshore City Name
Freshwater City
Onshore County Name
Vermilion
Designated Location
Survey Station No.
Designated Name
20+29
Pipe Fac Name
210a-2400
Segment Name
Row No. 3628
Federal
No
Location Type
Pipeline Right-Of-Way
Incident Area Type
Underground
Incident Area Subtype
Under Soil
Depth Of Cover
216
Crossing
No
Pipe Facility Type
Interstate
System Part Involved
Onshore Pipeline, Including Valve Sites
Item Involved
Pipe
Pipe Type
Pipe Body
Pipe Diameter
16
Pipe Wall Thickness
0.375
Pipe Smys
52000
Pipe Specification
Api 5lx
Pipe Seam Type
Dsaw
Pipe Manufacturer
Kaiser
Pipe Coating Type
Coal Tar
Installation Year
1978
Manufactured Year
1977
Material Involved
Carbon Steel
Release Type
Leak
Leak Type
Other
Leak Type Other
Unknown
Class Location Type
Class 1 Location
Could Be Hca
No
Pir Radius
419
Heat Damage Ind
No
Non Heat Damage Ind
No
Hca Fatalities Ind
No
Est Cost Oper Paid
10000
Est Cost Unintentional Release
20973
Est Cost Intentional Release
30000
Est Cost Prop Damage
1452000
Est Cost Emergency
358000
Est Cost Other
0
Prpty
1870973
Accident Psig
840
Mop Psig
1440
Mop Cfr Section
Not On Omb-Approved Form When Submitted
Accident Pressure
Pressure Did Not Exceed Maop
Pressure Restriction Ind
No
Upstream Valve Type Ind
Manual
Downstream Valve Type Ind
Manual
Length Segment Isolated
121018
Internal Inspection Ind
No
Tight Mitered Ind
Yes
Operation Complications Ind
Yes
Low Flow 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 Public
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 leak was small enough to not idetifiable by the controller from the data provided by scada
Employee Drug Test Ind
No
Contractor Drug Test Ind
No
Cause
Corrosion Failure
Cause Details
Internal Corrosion
Internal External
Internal Corrosion
Int Visual Exam Results
Other
Int Visual Exam Details
Pinhole Leak At 6 O'clock Position
Int Other Corrosion Ind
Yes
Int Corrosion Type Details
Low Flow On A Dead-End Lateral
Int Other Basis Ind
Yes
Int Corrosion Basis Details
Historical Data
Int Other Loc Ind
Yes
Corrosion Location Details
Dead-End Leg Of Sub-Sea Lateral
Corrosion Inhibitors
Yes
Corrosion Lining
No
Cleaning Dewatering
No
Corrosion Coupons
No
Collected Data Ind
No
Has Hydrtst Conduc Before Ind
Yes
Hydrtst Most Rcnt Year
2009
Hydrtst Most Rcnt Pressure
1941
Direct Asmnt Conducted
No
Non Destructive Exam Ind
No
Preparer Name
N***** H******
Preparer Title
Director Interstate Regulatory Compliance
Preparer Email
N*************@e*************.com
Preparer Telephone
713-857-5479
Authorizer Name
N***** H******
Authorizer Title
Director Interstate Regulatory Compliance
Authorizer Telephone
713-857-5479
Authorizer Email
N*************@e*************.com
Narrative
This pipeline leak was reported to tgc gas control center at 1506 hrs. By a local oilfield operator working for an unidentified producer in the area. This operator was working from a float plane and flew over the leak location. Gas control contacted the local operations personnel who dispatched a helicopter to the location to verify the report. Upon arrival the local personnel confirmed the leak and was able to land near the downstream valve setting and close the isolation valve. Once additional personnel arrived on location the helicopter was dispatched offshore to vr 26b and the upstream isolation valve closed and the pipeline was shut in at 1701 hrs. And pressurization process commenced. During the depressurization process the pipeline began to leak condensate. Tgc personnel immediately dispatched an local osro to the location to isolate the release and begin clean-up operations. Once the release was contained pipeline repair resources were mobilized and an attempt was made to excavate the pipeline. Because of the depth of the pipe and the unstable soil conditions the decision was made to bring in a geotechnical engineering contractor to perform soil analysis and provide an excavation shoring system to meet osha regulations. The investigation and repair operation are on hold until the shoring system is available and can be installed to allow safe entrance into the excavation. This line was abandoned following the investigation into repairing the pipeline. The cost and difficulty of repair were the attributing factors for the decision.
| Report Received Date | 2011-07-06 00:00:00 |
|---|---|
| Iyear | 2011 |
| Report Number | 20110227 |
| Supplemental Number | 16047 |
| Report Type | Supplemental Final |
| Operator Id | 19730 PHMSA Enforcement |
| Name | Trunkline Gas Co |
| Operator Street Address | 1300 Main Street |
| Operator City Name | Houston |
| Operator State Abbreviation | TX |
| Operator Postal Code | 77002 |
| Local Datetime | 2011-06-10 13:37:00 |
| Location Latitude | 29.53595 Google Maps OpenStreetMap |
| Location Longitude | -92.33078 Google Maps OpenStreetMap |
| Nrc Rpt Num | 979305 NRC Report How to search |
| Nrc Rpt Datetime | 2011-06-10 15:38:00 |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 5000 |
| Intentional Release | 7152 |
| Accompanying Liquid | 120 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Shutdown Due Accident Ind | Yes |
| Shutdown Datetime | 2011-06-10 17:01:00 |
| Still Shutdown Ind | Yes |
| Ignite Ind | No |
| Explode Ind | No |
| Num Pub Evacuated | 0 |
| Incident Identified Datetime | 2011-06-10 15:06:00 |
| On Site Datetime | 2011-06-10 16:25:00 |
| On Off Shore | Onshore |
| Onshore State Abbreviation | La |
| Onshore Postal Code | 70548 |
| Onshore City Name | Freshwater City |
| Onshore County Name | Vermilion |
| Designated Location | Survey Station No. |
| Designated Name | 20+29 |
| Pipe Fac Name | 210a-2400 |
| Segment Name | Row No. 3628 |
| Federal | No |
| Location Type | Pipeline Right-Of-Way |
| Incident Area Type | Underground |
| Incident Area Subtype | Under Soil |
| Depth Of Cover | 216 |
| Crossing | No |
| Pipe Facility Type | Interstate |
| System Part Involved | Onshore Pipeline, Including Valve Sites |
| Item Involved | Pipe |
| Pipe Type | Pipe Body |
| Pipe Diameter | 16 |
| Pipe Wall Thickness | 0.375 |
| Pipe Smys | 52000 |
| Pipe Specification | Api 5lx |
| Pipe Seam Type | Dsaw |
| Pipe Manufacturer | Kaiser |
| Pipe Coating Type | Coal Tar |
| Installation Year | 1978 |
| Manufactured Year | 1977 |
| Material Involved | Carbon Steel |
| Release Type | Leak |
| Leak Type | Other |
| Leak Type Other | Unknown |
| Class Location Type | Class 1 Location |
| Could Be Hca | No |
| Pir Radius | 419 |
| Heat Damage Ind | No |
| Non Heat Damage Ind | No |
| Hca Fatalities Ind | No |
| Est Cost Oper Paid | 10000 |
| Est Cost Unintentional Release | 20973 |
| Est Cost Intentional Release | 30000 |
| Est Cost Prop Damage | 1452000 |
| Est Cost Emergency | 358000 |
| Est Cost Other | 0 |
| Prpty | 1870973 |
| Accident Psig | 840 |
| Mop Psig | 1440 |
| Mop Cfr Section | Not On Omb-Approved Form When Submitted View CFR 49 §192 |
| Accident Pressure | Pressure Did Not Exceed Maop |
| Pressure Restriction Ind | No |
| Upstream Valve Type Ind | Manual |
| Downstream Valve Type Ind | Manual |
| Length Segment Isolated | 121018 |
| Internal Inspection Ind | No |
| Tight Mitered Ind | Yes |
| Operation Complications Ind | Yes |
| Low Flow 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 Public |
| 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 leak was small enough to not idetifiable by the controller from the data provided by scada |
| Employee Drug Test Ind | No |
| Contractor Drug Test Ind | No |
| Cause | Corrosion Failure |
| Cause Details | Internal Corrosion |
| Internal External | Internal Corrosion |
| Int Visual Exam Results | Other |
| Int Visual Exam Details | Pinhole Leak At 6 O'clock Position |
| Int Other Corrosion Ind | Yes |
| Int Corrosion Type Details | Low Flow On A Dead-End Lateral |
| Int Other Basis Ind | Yes |
| Int Corrosion Basis Details | Historical Data |
| Int Other Loc Ind | Yes |
| Corrosion Location Details | Dead-End Leg Of Sub-Sea Lateral |
| Corrosion Inhibitors | Yes |
| Corrosion Lining | No |
| Cleaning Dewatering | No |
| Corrosion Coupons | No |
| Collected Data Ind | No |
| Has Hydrtst Conduc Before Ind | Yes |
| Hydrtst Most Rcnt Year | 2009 |
| Hydrtst Most Rcnt Pressure | 1941 |
| Direct Asmnt Conducted | No |
| Non Destructive Exam Ind | No |
| Preparer Name | N***** H****** |
| Preparer Title | Director Interstate Regulatory Compliance |
| Preparer Email | N*************@e*************.com |
| Preparer Telephone | 713-857-5479 |
| Authorizer Name | N***** H****** |
| Authorizer Title | Director Interstate Regulatory Compliance |
| Authorizer Telephone | 713-857-5479 |
| Authorizer Email | N*************@e*************.com |
| Narrative | This pipeline leak was reported to tgc gas control center at 1506 hrs. By a local oilfield operator working for an unidentified producer in the area. This operator was working from a float plane and flew over the leak location. Gas control contacted the local operations personnel who dispatched a helicopter to the location to verify the report. Upon arrival the local personnel confirmed the leak and was able to land near the downstream valve setting and close the isolation valve. Once additional personnel arrived on location the helicopter was dispatched offshore to vr 26b and the upstream isolation valve closed and the pipeline was shut in at 1701 hrs. And pressurization process commenced. During the depressurization process the pipeline began to leak condensate. Tgc personnel immediately dispatched an local osro to the location to isolate the release and begin clean-up operations. Once the release was contained pipeline repair resources were mobilized and an attempt was made to excavate the pipeline. Because of the depth of the pipe and the unstable soil conditions the decision was made to bring in a geotechnical engineering contractor to perform soil analysis and provide an excavation shoring system to meet osha regulations. The investigation and repair operation are on hold until the shoring system is available and can be installed to allow safe entrance into the excavation. This line was abandoned following the investigation into repairing the pipeline. The cost and difficulty of repair were the attributing factors for the decision. |
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