Incident details
Operator, cause, commodity and consequences with raw source fields.
GTG incident on 2011-10-31 — OK
Operator
Williams Gas Pipeline - Transco
Cause
Corrosion Failure
Commodity
Natural Gas
Program
GTG
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$650,000
Incident datetime
2011-10-31 08:00
Report number
Location
OK
Narrative
On the evening of october 30th, williams received a call from the uscg stating that there were bubbles seen coming from coordinates 90 53.92n ' 29 08.750w. The transco district manager determined that it was safer to wait until morning before sending a crew offshore. At the time of the leak, transco could not verify whether it was their line leaking or not. When crews arrived at the leak site, a determination was made that it was in fact transco's pipeline. The valves were closed, the line was blown down, and a clamp was installed. The leak was determined to be a pinhole leak at the 6 o'clock position on the girth weld. The pipeline was restored to service on november 8, 2011.
Detailed record list
Report Received Date
2011-11-18 00:00:00
Iyear
2011
Report Number
20110386
Supplemental Number
16059
Report Type
Supplemental Final
Operator Id
19570
Name
Williams Gas Pipeline - Transco
Operator Street Address
One Williams Center Md 43-4
Operator City Name
Tulsa
Operator State Abbreviation
OK
Operator Postal Code
74172
Local Datetime
2011-10-30 18:55:00
Location Latitude
29.1451
Location Longitude
-90.89953333
Nrc Rpt Num
994031
Nrc Rpt Datetime
2011-10-30 19:00:00
Commodity Released Type
Natural Gas
Unintentional Release
225
Intentional Release
17087
Accompanying Liquid
29.5
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Shutdown Due Accident Ind
Yes
Shutdown Datetime
2011-10-31 08:45:00
Restart Datetime
2011-11-08 12:00:00
Ignite Ind
No
Explode Ind
No
Num Pub Evacuated
0
Incident Identified Datetime
2011-10-31 08:00:00
On Site Datetime
2011-10-31 08:00:00
On Off Shore
Onshore
Onshore State Abbreviation
La
Onshore Postal Code
70353
Onshore City Name
Dulac
Onshore County Name
Terrebonne
Designated Location
Milepost
Designated Name
31.644
Pipe Fac Name
Sela-D
Segment Name
22-7060
Federal
No
Location Type
Pipeline Right-Of-Way
Incident Area Type
Underground
Incident Area Subtype
Other
Incident Area Details
Marsh
Depth Of Cover
60
Crossing
No
Pipe Facility Type
Interstate
System Part Involved
Onshore Pipeline, Including Valve Sites
Item Involved
Weld/fusion, Including Heat-Affected Zone
Pipe Diameter
26
Pipe Wall Thickness
0.434
Pipe Smys
52000
Pipe Specification
Api 5l
Pipe Seam Type
Seamless
Pipe Manufacturer
Republic Steel
Pipe Coating Type
Other
Pipe Coating Details
Concrete Over Somastic Coating
Weld Subtype
Pipe Girth Weld
Installation Year
1968
Manufactured Year
1967
Material Involved
Carbon Steel
Release Type
Leak
Leak Type
Pinhole
Class Location Type
Class 1 Location
Could Be Hca
No
Pir Radius
634
Heat Damage Ind
No
Non Heat Damage Ind
No
Hca Fatalities Ind
No
Est Cost Oper Paid
20000
Est Cost Unintentional Release
7000
Est Cost Intentional Release
57300
Est Cost Prop Damage
650000
Est Cost Emergency
30000
Est Cost Other
0
Prpty
764300
Accident Psig
805
Mop Psig
1250
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
Automatic
Downstream Valve Type Ind
Manual
Length Segment Isolated
91661
Internal Inspection Ind
No
Other Restrictions Ind
Yes
Other Inspection Ind
Yes
Internal Inspection Details
Pig Traps Not Designed For A Pig Tool.
Operation Complications Ind
No
Pipeline Function
Transmission System
Scada In Place 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 pinhole leak not large enough to have an indication of pressure drop or change in conditions.
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
Not Cut Open
Int Corrosive Commodity Ind
Yes
Int Field Exam Basis Ind
Yes
Int Other Loc Ind
Yes
Corrosion Location Details
Girth Weld 6 O'clock Position.
Corrosion Inhibitors
Yes
Corrosion Lining
Yes
Cleaning Dewatering
Yes
Corrosion Coupons
Yes
Collected Data Ind
No
Has Hydrtst Conduc Before Ind
No
Direct Asmnt Conducted
No
Non Destructive Exam Ind
No
Preparer Name
E**** R********
Preparer Title
Pipeline Safety Specialist
Preparer Email
E****************@w*******.com
Preparer Telephone
713-215-2846
Preparer Fax
713-215-2222
Authorizer Name
M**** S****
Authorizer Title
Manager Pipeline Safety
Authorizer Telephone
713-215-2111
Authorizer Email
M**********@w*******.com
Narrative
On the evening of october 30th, williams received a call from the uscg stating that there were bubbles seen coming from coordinates 90 53.92n ' 29 08.750w. The transco district manager determined that it was safer to wait until morning before sending a crew offshore. At the time of the leak, transco could not verify whether it was their line leaking or not. When crews arrived at the leak site, a determination was made that it was in fact transco's pipeline. The valves were closed, the line was blown down, and a clamp was installed. The leak was determined to be a pinhole leak at the 6 o'clock position on the girth weld. The pipeline was restored to service on november 8, 2011.
| Report Received Date | 2011-11-18 00:00:00 |
|---|---|
| Iyear | 2011 |
| Report Number | 20110386 |
| Supplemental Number | 16059 |
| Report Type | Supplemental Final |
| Operator Id | 19570 PHMSA Enforcement |
| Name | Williams Gas Pipeline - Transco |
| Operator Street Address | One Williams Center Md 43-4 |
| Operator City Name | Tulsa |
| Operator State Abbreviation | OK |
| Operator Postal Code | 74172 |
| Local Datetime | 2011-10-30 18:55:00 |
| Location Latitude | 29.1451 Google Maps OpenStreetMap |
| Location Longitude | -90.89953333 Google Maps OpenStreetMap |
| Nrc Rpt Num | 994031 NRC Report How to search |
| Nrc Rpt Datetime | 2011-10-30 19:00:00 |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 225 |
| Intentional Release | 17087 |
| Accompanying Liquid | 29.5 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Shutdown Due Accident Ind | Yes |
| Shutdown Datetime | 2011-10-31 08:45:00 |
| Restart Datetime | 2011-11-08 12:00:00 |
| Ignite Ind | No |
| Explode Ind | No |
| Num Pub Evacuated | 0 |
| Incident Identified Datetime | 2011-10-31 08:00:00 |
| On Site Datetime | 2011-10-31 08:00:00 |
| On Off Shore | Onshore |
| Onshore State Abbreviation | La |
| Onshore Postal Code | 70353 |
| Onshore City Name | Dulac |
| Onshore County Name | Terrebonne |
| Designated Location | Milepost |
| Designated Name | 31.644 |
| Pipe Fac Name | Sela-D |
| Segment Name | 22-7060 |
| Federal | No |
| Location Type | Pipeline Right-Of-Way |
| Incident Area Type | Underground |
| Incident Area Subtype | Other |
| Incident Area Details | Marsh |
| Depth Of Cover | 60 |
| Crossing | No |
| Pipe Facility Type | Interstate |
| System Part Involved | Onshore Pipeline, Including Valve Sites |
| Item Involved | Weld/fusion, Including Heat-Affected Zone |
| Pipe Diameter | 26 |
| Pipe Wall Thickness | 0.434 |
| Pipe Smys | 52000 |
| Pipe Specification | Api 5l |
| Pipe Seam Type | Seamless |
| Pipe Manufacturer | Republic Steel |
| Pipe Coating Type | Other |
| Pipe Coating Details | Concrete Over Somastic Coating |
| Weld Subtype | Pipe Girth Weld |
| Installation Year | 1968 |
| Manufactured Year | 1967 |
| Material Involved | Carbon Steel |
| Release Type | Leak |
| Leak Type | Pinhole |
| Class Location Type | Class 1 Location |
| Could Be Hca | No |
| Pir Radius | 634 |
| Heat Damage Ind | No |
| Non Heat Damage Ind | No |
| Hca Fatalities Ind | No |
| Est Cost Oper Paid | 20000 |
| Est Cost Unintentional Release | 7000 |
| Est Cost Intentional Release | 57300 |
| Est Cost Prop Damage | 650000 |
| Est Cost Emergency | 30000 |
| Est Cost Other | 0 |
| Prpty | 764300 |
| Accident Psig | 805 |
| Mop Psig | 1250 |
| 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 | Automatic |
| Downstream Valve Type Ind | Manual |
| Length Segment Isolated | 91661 |
| Internal Inspection Ind | No |
| Other Restrictions Ind | Yes |
| Other Inspection Ind | Yes |
| Internal Inspection Details | Pig Traps Not Designed For A Pig Tool. |
| Operation Complications Ind | No |
| Pipeline Function | Transmission System |
| Scada In Place 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 pinhole leak not large enough to have an indication of pressure drop or change in conditions. |
| 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 | Not Cut Open |
| Int Corrosive Commodity Ind | Yes |
| Int Field Exam Basis Ind | Yes |
| Int Other Loc Ind | Yes |
| Corrosion Location Details | Girth Weld 6 O'clock Position. |
| Corrosion Inhibitors | Yes |
| Corrosion Lining | Yes |
| Cleaning Dewatering | Yes |
| Corrosion Coupons | Yes |
| Collected Data Ind | No |
| Has Hydrtst Conduc Before Ind | No |
| Direct Asmnt Conducted | No |
| Non Destructive Exam Ind | No |
| Preparer Name | E**** R******** |
| Preparer Title | Pipeline Safety Specialist |
| Preparer Email | E****************@w*******.com |
| Preparer Telephone | 713-215-2846 |
| Preparer Fax | 713-215-2222 |
| Authorizer Name | M**** S**** |
| Authorizer Title | Manager Pipeline Safety |
| Authorizer Telephone | 713-215-2111 |
| Authorizer Email | M**********@w*******.com |
| Narrative | On the evening of october 30th, williams received a call from the uscg stating that there were bubbles seen coming from coordinates 90 53.92n ' 29 08.750w. The transco district manager determined that it was safer to wait until morning before sending a crew offshore. At the time of the leak, transco could not verify whether it was their line leaking or not. When crews arrived at the leak site, a determination was made that it was in fact transco's pipeline. The valves were closed, the line was blown down, and a clamp was installed. The leak was determined to be a pinhole leak at the 6 o'clock position on the girth weld. The pipeline was restored to service on november 8, 2011. |
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