Incident details
Operator, cause, commodity and consequences with raw source fields.
GTG incident on 2011-06-14 — TX
Operator
Tennessee Gas Pipeline Co (El Paso)
Cause
Material Failure Of Pipe Or Weld
Commodity
Natural Gas
Program
GTG
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$306,000
Incident datetime
2011-06-14 10:10
Report number
Location
TX
Narrative
Tennessee gas pipeline (tgp) was notified on june 14, 2011, by boemre and by a producer, stone energy, of bubbles on the ocs in bay mar block 5, the coordinates of which indicated they were coming from tgp's pipeline facility. Upon investigation, divers removed protective mats from a subsea tie-in assembly on tgp's 524c-400 pipeline and found a crack in the neck of a 2" flange that was part of the tie-in of an intersecting pipeline. Repairs were made and the pipeline facility was placed back into service. Metallurgical analysis concluded that the crack in the weld of the 2" flange was likely due to overload fracture due to external bending and/or tensile forces. Such forces were possibly caused by instability of the subsea floor and concrete mats placed over assembly at time of construction. Year of pipe manufacture is assumed to be commensurate with year of installation.
Detailed record list
Report Received Date
2011-07-06 00:00:00
Iyear
2011
Report Number
20110228
Supplemental Number
16139
Report Type
Supplemental Final
Operator Id
19160
Name
Tennessee Gas Pipeline Co (El Paso)
Operator Street Address
1001 Louisiana St
Operator City Name
Houston
Operator State Abbreviation
TX
Operator Postal Code
77002
Local Datetime
2011-06-14 08:45:00
Location Latitude
29.047166
Location Longitude
-90.229333
Nrc Rpt Num
979623
Nrc Rpt Datetime
2011-06-14 11:15:00
Commodity Released Type
Natural Gas
Unintentional Release
675
Intentional Release
1970
Accompanying Liquid
0
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Shutdown Due Accident Ind
Yes
Shutdown Datetime
2011-06-14 14:20:00
Restart Datetime
2011-06-28 19:30:00
Ignite Ind
No
Explode Ind
No
Num Pub Evacuated
0
Incident Identified Datetime
2011-06-14 10:10:00
On Site Datetime
2011-06-15 18:30:00
On Off Shore
Offshore
Off Water Depth
40
Off Accident Origin
On The Outer Continental Shelf (Ocs)
Off Ocs Area
Bay Mar
Off Ocs Block
5
Off Area Accident Type
Below Water, Pipe On Or Above Seabed
Pipe Facility Type
Interstate
System Part Involved
Offshore Pipeline, Including Riser And Riser Bend
Item Involved
Weld/fusion, Including Heat-Affected Zone
Pipe Diameter
16
Pipe Wall Thickness
0.406
Pipe Smys
42000
Pipe Specification
Api 5lx
Pipe Seam Type
Seamless
Pipe Manufacturer
National Tube
Pipe Coating Type
Coal Tar
Weld Subtype
Pipe Girth Weld
Installation Year
1961
Manufactured Year
1961
Material Involved
Carbon Steel
Release Type
Leak
Leak Type
Crack
Class Location Type
Class 1 Location
Could Be Hca
No
Pir Radius
361
Heat Damage Ind
No
Non Heat Damage Ind
No
Hca Fatalities Ind
No
Est Cost Oper Paid
0
Est Cost Unintentional Release
2700
Est Cost Intentional Release
7884
Est Cost Prop Damage
306000
Est Cost Emergency
4000
Est Cost Other
0
Prpty
320584
Accident Psig
700
Mop Psig
1069
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
81840
Internal Inspection Ind
No
Diameter Change Ind
Yes
Tight Mitered Ind
Yes
Other Inspection Ind
Yes
Internal Inspection Details
At Subsea Tie-In Where A Different Diameter Line Intersects At 90 Degrees.
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
Other
Accident Details
Tgp Was Notified By Both Boemre And By Stone Energy, A Producer.
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
Pressures were not outside normal operating limits.
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
Field Exam Ind
Yes
Metallurgical Ind
Yes
Stress Subtype
Other
Stress Details
Overload Fracture Induced By External Bending And/or Tensile Forces.
Additional Crack Ind
Yes
Collected Data Ind
No
Has Hydrtst Conduc Before Ind
No
Direct Asmnt Conducted
No
Non Destructive Exam Ind
No
Preparer Name
Z****** R*****
Preparer Title
Engineer - Pipline
Preparer Email
Z*************@k***********.com
Preparer Telephone
7134206633
Authorizer Name
Z****** R*****
Authorizer Title
Engineer - Pipline
Authorizer Telephone
7134206633
Authorizer Email
Z*************@k***********.com
Narrative
Tennessee gas pipeline (tgp) was notified on june 14, 2011, by boemre and by a producer, stone energy, of bubbles on the ocs in bay mar block 5, the coordinates of which indicated they were coming from tgp's pipeline facility. Upon investigation, divers removed protective mats from a subsea tie-in assembly on tgp's 524c-400 pipeline and found a crack in the neck of a 2" flange that was part of the tie-in of an intersecting pipeline. Repairs were made and the pipeline facility was placed back into service. Metallurgical analysis concluded that the crack in the weld of the 2" flange was likely due to overload fracture due to external bending and/or tensile forces. Such forces were possibly caused by instability of the subsea floor and concrete mats placed over assembly at time of construction. Year of pipe manufacture is assumed to be commensurate with year of installation.
| Report Received Date | 2011-07-06 00:00:00 |
|---|---|
| Iyear | 2011 |
| Report Number | 20110228 |
| Supplemental Number | 16139 |
| Report Type | Supplemental Final |
| Operator Id | 19160 PHMSA Enforcement |
| Name | Tennessee Gas Pipeline Co (El Paso) |
| Operator Street Address | 1001 Louisiana St |
| Operator City Name | Houston |
| Operator State Abbreviation | TX |
| Operator Postal Code | 77002 |
| Local Datetime | 2011-06-14 08:45:00 |
| Location Latitude | 29.047166 Google Maps OpenStreetMap |
| Location Longitude | -90.229333 Google Maps OpenStreetMap |
| Nrc Rpt Num | 979623 NRC Report How to search |
| Nrc Rpt Datetime | 2011-06-14 11:15:00 |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 675 |
| Intentional Release | 1970 |
| Accompanying Liquid | 0 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Shutdown Due Accident Ind | Yes |
| Shutdown Datetime | 2011-06-14 14:20:00 |
| Restart Datetime | 2011-06-28 19:30:00 |
| Ignite Ind | No |
| Explode Ind | No |
| Num Pub Evacuated | 0 |
| Incident Identified Datetime | 2011-06-14 10:10:00 |
| On Site Datetime | 2011-06-15 18:30:00 |
| On Off Shore | Offshore |
| Off Water Depth | 40 |
| Off Accident Origin | On The Outer Continental Shelf (Ocs) |
| Off Ocs Area | Bay Mar |
| Off Ocs Block | 5 |
| Off Area Accident Type | Below Water, Pipe On Or Above Seabed |
| Pipe Facility Type | Interstate |
| System Part Involved | Offshore Pipeline, Including Riser And Riser Bend |
| Item Involved | Weld/fusion, Including Heat-Affected Zone |
| Pipe Diameter | 16 |
| Pipe Wall Thickness | 0.406 |
| Pipe Smys | 42000 |
| Pipe Specification | Api 5lx |
| Pipe Seam Type | Seamless |
| Pipe Manufacturer | National Tube |
| Pipe Coating Type | Coal Tar |
| Weld Subtype | Pipe Girth Weld |
| Installation Year | 1961 |
| Manufactured Year | 1961 |
| Material Involved | Carbon Steel |
| Release Type | Leak |
| Leak Type | Crack |
| Class Location Type | Class 1 Location |
| Could Be Hca | No |
| Pir Radius | 361 |
| Heat Damage Ind | No |
| Non Heat Damage Ind | No |
| Hca Fatalities Ind | No |
| Est Cost Oper Paid | 0 |
| Est Cost Unintentional Release | 2700 |
| Est Cost Intentional Release | 7884 |
| Est Cost Prop Damage | 306000 |
| Est Cost Emergency | 4000 |
| Est Cost Other | 0 |
| Prpty | 320584 |
| Accident Psig | 700 |
| Mop Psig | 1069 |
| 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 | 81840 |
| Internal Inspection Ind | No |
| Diameter Change Ind | Yes |
| Tight Mitered Ind | Yes |
| Other Inspection Ind | Yes |
| Internal Inspection Details | At Subsea Tie-In Where A Different Diameter Line Intersects At 90 Degrees. |
| 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 | Other |
| Accident Details | Tgp Was Notified By Both Boemre And By Stone Energy, A Producer. |
| 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 | Pressures were not outside normal operating limits. |
| 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 |
| Field Exam Ind | Yes |
| Metallurgical Ind | Yes |
| Stress Subtype | Other |
| Stress Details | Overload Fracture Induced By External Bending And/or Tensile Forces. |
| Additional Crack Ind | Yes |
| Collected Data Ind | No |
| Has Hydrtst Conduc Before Ind | No |
| Direct Asmnt Conducted | No |
| Non Destructive Exam Ind | No |
| Preparer Name | Z****** R***** |
| Preparer Title | Engineer - Pipline |
| Preparer Email | Z*************@k***********.com |
| Preparer Telephone | 7134206633 |
| Authorizer Name | Z****** R***** |
| Authorizer Title | Engineer - Pipline |
| Authorizer Telephone | 7134206633 |
| Authorizer Email | Z*************@k***********.com |
| Narrative | Tennessee gas pipeline (tgp) was notified on june 14, 2011, by boemre and by a producer, stone energy, of bubbles on the ocs in bay mar block 5, the coordinates of which indicated they were coming from tgp's pipeline facility. Upon investigation, divers removed protective mats from a subsea tie-in assembly on tgp's 524c-400 pipeline and found a crack in the neck of a 2" flange that was part of the tie-in of an intersecting pipeline. Repairs were made and the pipeline facility was placed back into service. Metallurgical analysis concluded that the crack in the weld of the 2" flange was likely due to overload fracture due to external bending and/or tensile forces. Such forces were possibly caused by instability of the subsea floor and concrete mats placed over assembly at time of construction. Year of pipe manufacture is assumed to be commensurate with year of installation. |
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