Incident details
Operator, cause, commodity and consequences with raw source fields.
GTG incident on 2014-11-24 — TX
Operator
Enable Gas Transmission, Llc
Cause
Material Failure Of Pipe Or Weld
Commodity
Natural Gas
Program
GTG
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$205,641
Incident datetime
2014-11-24 19:31
Report number
Location
TX
Narrative
1635 - third party called and reported a gas leak near his house at 314 harding lane in jessieville, ar. Reports that he can see foam, smell gas, and hear a hissing noise coming from an underground line. He states that this has been going on for 3-4 days. 1643 - system control notified mark atkinson (malvern team) and relayed all information. Mark reports that it will take him approximately 2 hours to get on-site and notified him that bt-1 and bt-1-an are close to the reported leak. States that this may be local distribution company leak. 1648 - system control notified local distribution company and relayed information. 1931 - technician reports that they have found a transmission leak on either bt-1 or bt-1-an. He states that he is in touch with the operation manager and are trying to get a game plan in action on getting the leak dug up and repaired. 2005 - system control made report to arkansas serc (#16826). 2010 - system control notified the garland county dispatch office and made a report. He requested that we notify the jessieville fire department dispatch office as well. 2015 - system control notified the jessieville fire department dispatch office. 2018 - system control made report to the nrc (#1101914). 2100 - system control spoke with field personnel; he states that they are going to isolate bt-1-an and watch for pressure drops to see if it is the leaking line. They are going to valve off the mainline valves on gm-232 and gm-233 on the 24 inch(bt-1-an). 2320 - operation manager called and reported that they have confirmed that bt-1-an is the leaking line. They have worked this plan for the blow-down. Estimates approximately 4-5 hours for the blowdown to be complete; goal is to get to 0# on the line, but will accept pressures under 50#. Approximate gas released during blowdown will be 15,732.2 mcf. Line back in service december 7th at 17:05. Update april 10, 2015 - pipe was sent to lab for metallugic review, completed report received april 2, 2015. Stress engineering's test results are as follows: visual, metallographic, and fractographic examination of the sample indicated that cracks initiated on the outside surface of the pipe. The morphology of the cracks included closely-spaced cracks in colonies, transgranular and branched growth path, crescent-shaped cracks partially covered with magnetite, and enlargement of the cracks at the outside surface due to corrosion. These features support the conclusion that this leak was the result of near-neutral ph stress corrosion cracking (scc). These cracks were aligned perpendicular to the longitudinal axis of the pipe at the extrados of an over-bend and were created by bending loads in the pipeline. The fact that the final failure was due to ductile overload also supports the assertion that the longitudinal stresses were significant at this location. Further, the upward movement of the pipe after it was cut in the ditch during excavation is conformation of this conclusion. Stress engineering did not observe any material flaws or defects in the sample material. The microstructure of the sample is typical for a carbon-steel pipe material. The properties of the material are consistent with the requirements of API 5lx (1968) for grade x60 and are not believed to have contributed to the failure. 9/23/2015 additional analysis was conducted on the ili data to look for similar conditions in the line segment and these areas were overlaid with cis data. Three (3) locations were selected to investigate, they will dug prior to the end of october.
Detailed record list
Report Received Date
2014-12-11 00:00:00
Iyear
2014
Report Number
20140134
Supplemental Number
16866
Report Type
Supplemental Final
Operator Id
Name
Enable Gas Transmission, Llc
Operator Street Address
1111 Louisiana Street
Operator City Name
Houston
Operator State Abbreviation
TX
Operator Postal Code
77002
Local Datetime
2014-11-24 16:35:00
Location Latitude
34.69583
Location Longitude
-93.1269
Nrc Rpt Num
1101914
Nrc Rpt Datetime
2014-11-24 20:18:00
Commodity Released Type
Natural Gas
Unintentional Release
3043
Intentional Release
15732
Accompanying Liquid
0
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Shutdown Due Accident Ind
Yes
Shutdown Datetime
2014-11-24 23:20:00
Restart Datetime
2014-12-07 17:05:00
Ignite Ind
No
Explode Ind
No
Num Pub Evacuated
0
Incident Identified Datetime
2014-11-24 19:31:00
On Site Datetime
2014-11-24 19:31:00
On Off Shore
Onshore
Onshore State Abbreviation
Ar
Onshore Postal Code
71949
Onshore City Name
Jessieville
Onshore County Name
Garland
Designated Location
Milepost
Designated Name
3762+30
Pipe Fac Name
Bt-1-An
Segment Name
Bt-1-An
Federal
No
Location Type
Pipeline Right-Of-Way
Incident Area Type
Underground
Incident Area Subtype
Under Soil
Depth Of Cover
96
Crossing
No
Pipe Facility Type
Interstate
System Part Involved
Onshore Pipeline, Including Valve Sites
Item Involved
Pipe
Pipe Type
Pipe Body
Pipe Diameter
24
Pipe Wall Thickness
0.281
Pipe Smys
60000
Pipe Specification
Api 5lx
Pipe Seam Type
Dsaw
Pipe Manufacturer
Us Steel
Pipe Coating Type
Asphalt
Installation Year
1967
Manufactured Year
1967
Material Involved
Carbon Steel
Release Type
Leak
Leak Type
Crack
Class Location Type
Class 2 Location
Could Be Hca
No
Pir Radius
523
Heat Damage Ind
No
Non Heat Damage Ind
No
Hca Fatalities Ind
No
Est Cost Oper Paid
0
Est Cost Unintentional Release
10498
Est Cost Intentional Release
54276
Est Cost Prop Damage
205641
Est Cost Emergency
4950
Est Cost Other
2500
Est Cost Other Details
Freight Lab Costs For Metallugic Review
Prpty
277865
Accident Psig
935
Mop Psig
1000
Mop Cfr Section
192.619(A)(2)
Accident Pressure
Pressure Did Not Exceed Maop
Pressure Restriction Ind
No
Upstream Valve Type Ind
Manual
Downstream Valve Type Ind
Manual
Length Segment Isolated
68977
Internal Inspection Ind
Yes
Operation Complications 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
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 land owner stated when he reported the leak that he sees foam, smells gas and hears a hissing noise coming from the ground that has been going on for three or four days.
Employee Drug Test Ind
No
Contractor Drug Test Ind
No
Cause
Material Failure Of Pipe Or Weld
Cause Details
Environmental Cracking-Related
Pwjf Failure Type
Environmental Cracking-Related
Metallurgical Ind
Yes
Stress Subtype
Other
Stress Details
External Force
Additional Crack Ind
Yes
Collected Data Ind
Yes
Axial Magnetic Flx Lkg Ind
Yes
Axial Recent Year
2013
Has Hydrtst Conduc Before Ind
No
Direct Asmnt Conducted
No
Non Destructive Exam Ind
No
Preparer Name
J**** C****
Preparer Title
Dot Compliance Manager
Preparer Email
J**********@e**************.com
Preparer Telephone
3184293664
Preparer Fax
3184293997
Authorizer Name
J***** C*****
Authorizer Title
Manager Of Dot Compliance Programs
Authorizer Telephone
3184293606
Authorizer Email
J************@e**************.com
Narrative
1635 - third party called and reported a gas leak near his house at 314 harding lane in jessieville, ar. Reports that he can see foam, smell gas, and hear a hissing noise coming from an underground line. He states that this has been going on for 3-4 days. 1643 - system control notified mark atkinson (malvern team) and relayed all information. Mark reports that it will take him approximately 2 hours to get on-site and notified him that bt-1 and bt-1-an are close to the reported leak. States that this may be local distribution company leak. 1648 - system control notified local distribution company and relayed information. 1931 - technician reports that they have found a transmission leak on either bt-1 or bt-1-an. He states that he is in touch with the operation manager and are trying to get a game plan in action on getting the leak dug up and repaired. 2005 - system control made report to arkansas serc (#16826). 2010 - system control notified the garland county dispatch office and made a report. He requested that we notify the jessieville fire department dispatch office as well. 2015 - system control notified the jessieville fire department dispatch office. 2018 - system control made report to the nrc (#1101914). 2100 - system control spoke with field personnel; he states that they are going to isolate bt-1-an and watch for pressure drops to see if it is the leaking line. They are going to valve off the mainline valves on gm-232 and gm-233 on the 24 inch(bt-1-an). 2320 - operation manager called and reported that they have confirmed that bt-1-an is the leaking line. They have worked this plan for the blow-down. Estimates approximately 4-5 hours for the blowdown to be complete; goal is to get to 0# on the line, but will accept pressures under 50#. Approximate gas released during blowdown will be 15,732.2 mcf. Line back in service december 7th at 17:05. Update april 10, 2015 - pipe was sent to lab for metallugic review, completed report received april 2, 2015. Stress engineering's test results are as follows: visual, metallographic, and fractographic examination of the sample indicated that cracks initiated on the outside surface of the pipe. The morphology of the cracks included closely-spaced cracks in colonies, transgranular and branched growth path, crescent-shaped cracks partially covered with magnetite, and enlargement of the cracks at the outside surface due to corrosion. These features support the conclusion that this leak was the result of near-neutral ph stress corrosion cracking (scc). These cracks were aligned perpendicular to the longitudinal axis of the pipe at the extrados of an over-bend and were created by bending loads in the pipeline. The fact that the final failure was due to ductile overload also supports the assertion that the longitudinal stresses were significant at this location. Further, the upward movement of the pipe after it was cut in the ditch during excavation is conformation of this conclusion. Stress engineering did not observe any material flaws or defects in the sample material. The microstructure of the sample is typical for a carbon-steel pipe material. The properties of the material are consistent with the requirements of API 5lx (1968) for grade x60 and are not believed to have contributed to the failure. 9/23/2015 additional analysis was conducted on the ili data to look for similar conditions in the line segment and these areas were overlaid with cis data. Three (3) locations were selected to investigate, they will dug prior to the end of october.
| Report Received Date | 2014-12-11 00:00:00 |
|---|---|
| Iyear | 2014 |
| Report Number | 20140134 |
| Supplemental Number | 16866 |
| Report Type | Supplemental Final |
| Operator Id | 602 PHMSA Enforcement |
| Name | Enable Gas Transmission, Llc |
| Operator Street Address | 1111 Louisiana Street |
| Operator City Name | Houston |
| Operator State Abbreviation | TX |
| Operator Postal Code | 77002 |
| Local Datetime | 2014-11-24 16:35:00 |
| Location Latitude | 34.69583 Google Maps OpenStreetMap |
| Location Longitude | -93.1269 Google Maps OpenStreetMap |
| Nrc Rpt Num | 1101914 NRC Report How to search |
| Nrc Rpt Datetime | 2014-11-24 20:18:00 |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 3043 |
| Intentional Release | 15732 |
| Accompanying Liquid | 0 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Shutdown Due Accident Ind | Yes |
| Shutdown Datetime | 2014-11-24 23:20:00 |
| Restart Datetime | 2014-12-07 17:05:00 |
| Ignite Ind | No |
| Explode Ind | No |
| Num Pub Evacuated | 0 |
| Incident Identified Datetime | 2014-11-24 19:31:00 |
| On Site Datetime | 2014-11-24 19:31:00 |
| On Off Shore | Onshore |
| Onshore State Abbreviation | Ar |
| Onshore Postal Code | 71949 |
| Onshore City Name | Jessieville |
| Onshore County Name | Garland |
| Designated Location | Milepost |
| Designated Name | 3762+30 |
| Pipe Fac Name | Bt-1-An |
| Segment Name | Bt-1-An |
| Federal | No |
| Location Type | Pipeline Right-Of-Way |
| Incident Area Type | Underground |
| Incident Area Subtype | Under Soil |
| Depth Of Cover | 96 |
| Crossing | No |
| Pipe Facility Type | Interstate |
| System Part Involved | Onshore Pipeline, Including Valve Sites |
| Item Involved | Pipe |
| Pipe Type | Pipe Body |
| Pipe Diameter | 24 |
| Pipe Wall Thickness | 0.281 |
| Pipe Smys | 60000 |
| Pipe Specification | Api 5lx |
| Pipe Seam Type | Dsaw |
| Pipe Manufacturer | Us Steel |
| Pipe Coating Type | Asphalt |
| Installation Year | 1967 |
| Manufactured Year | 1967 |
| Material Involved | Carbon Steel |
| Release Type | Leak |
| Leak Type | Crack |
| Class Location Type | Class 2 Location |
| Could Be Hca | No |
| Pir Radius | 523 |
| Heat Damage Ind | No |
| Non Heat Damage Ind | No |
| Hca Fatalities Ind | No |
| Est Cost Oper Paid | 0 |
| Est Cost Unintentional Release | 10498 |
| Est Cost Intentional Release | 54276 |
| Est Cost Prop Damage | 205641 |
| Est Cost Emergency | 4950 |
| Est Cost Other | 2500 |
| Est Cost Other Details | Freight Lab Costs For Metallugic Review |
| Prpty | 277865 |
| Accident Psig | 935 |
| Mop Psig | 1000 |
| Mop Cfr Section | 192.619(A)(2) 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 | 68977 |
| Internal Inspection Ind | Yes |
| Operation Complications 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 | 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 land owner stated when he reported the leak that he sees foam, smells gas and hears a hissing noise coming from the ground that has been going on for three or four days. |
| Employee Drug Test Ind | No |
| Contractor Drug Test Ind | No |
| Cause | Material Failure Of Pipe Or Weld |
| Cause Details | Environmental Cracking-Related |
| Pwjf Failure Type | Environmental Cracking-Related |
| Metallurgical Ind | Yes |
| Stress Subtype | Other |
| Stress Details | External Force |
| Additional Crack Ind | Yes |
| Collected Data Ind | Yes |
| Axial Magnetic Flx Lkg Ind | Yes |
| Axial Recent Year | 2013 |
| Has Hydrtst Conduc Before Ind | No |
| Direct Asmnt Conducted | No |
| Non Destructive Exam Ind | No |
| Preparer Name | J**** C**** |
| Preparer Title | Dot Compliance Manager |
| Preparer Email | J**********@e**************.com |
| Preparer Telephone | 3184293664 |
| Preparer Fax | 3184293997 |
| Authorizer Name | J***** C***** |
| Authorizer Title | Manager Of Dot Compliance Programs |
| Authorizer Telephone | 3184293606 |
| Authorizer Email | J************@e**************.com |
| Narrative | 1635 - third party called and reported a gas leak near his house at 314 harding lane in jessieville, ar. Reports that he can see foam, smell gas, and hear a hissing noise coming from an underground line. He states that this has been going on for 3-4 days. 1643 - system control notified mark atkinson (malvern team) and relayed all information. Mark reports that it will take him approximately 2 hours to get on-site and notified him that bt-1 and bt-1-an are close to the reported leak. States that this may be local distribution company leak. 1648 - system control notified local distribution company and relayed information. 1931 - technician reports that they have found a transmission leak on either bt-1 or bt-1-an. He states that he is in touch with the operation manager and are trying to get a game plan in action on getting the leak dug up and repaired. 2005 - system control made report to arkansas serc (#16826). 2010 - system control notified the garland county dispatch office and made a report. He requested that we notify the jessieville fire department dispatch office as well. 2015 - system control notified the jessieville fire department dispatch office. 2018 - system control made report to the nrc (#1101914). 2100 - system control spoke with field personnel; he states that they are going to isolate bt-1-an and watch for pressure drops to see if it is the leaking line. They are going to valve off the mainline valves on gm-232 and gm-233 on the 24 inch(bt-1-an). 2320 - operation manager called and reported that they have confirmed that bt-1-an is the leaking line. They have worked this plan for the blow-down. Estimates approximately 4-5 hours for the blowdown to be complete; goal is to get to 0# on the line, but will accept pressures under 50#. Approximate gas released during blowdown will be 15,732.2 mcf. Line back in service december 7th at 17:05. Update april 10, 2015 - pipe was sent to lab for metallugic review, completed report received april 2, 2015. Stress engineering's test results are as follows: visual, metallographic, and fractographic examination of the sample indicated that cracks initiated on the outside surface of the pipe. The morphology of the cracks included closely-spaced cracks in colonies, transgranular and branched growth path, crescent-shaped cracks partially covered with magnetite, and enlargement of the cracks at the outside surface due to corrosion. These features support the conclusion that this leak was the result of near-neutral ph stress corrosion cracking (scc). These cracks were aligned perpendicular to the longitudinal axis of the pipe at the extrados of an over-bend and were created by bending loads in the pipeline. The fact that the final failure was due to ductile overload also supports the assertion that the longitudinal stresses were significant at this location. Further, the upward movement of the pipe after it was cut in the ditch during excavation is conformation of this conclusion. Stress engineering did not observe any material flaws or defects in the sample material. The microstructure of the sample is typical for a carbon-steel pipe material. The properties of the material are consistent with the requirements of API 5lx (1968) for grade x60 and are not believed to have contributed to the failure. 9/23/2015 additional analysis was conducted on the ili data to look for similar conditions in the line segment and these areas were overlaid with cis data. Three (3) locations were selected to investigate, they will dug prior to the end of october. |
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