Incident details
Operator, cause, commodity and consequences with raw source fields.
GTG incident on 2011-05-24 — TX
Operator
Northwest Pipeline Corp (Wgp)
Cause
Material Failure Of Pipe Or Weld
Commodity
Natural Gas
Program
GTG
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$68,500
Incident datetime
2011-05-24 12:30
Report number
Location
TX
Narrative
During the annual pocatello air patrol of the pipeline, a location with dead vegetation was identified at mile post 554.6. A ground patrol was sent to investigate and found the dead vegetation and used a flame pack to identify leaking gas. By probing and sniffing, it was determined that the leak was on the 24" 1401 loop line. The pipeline was immediately blown down to 43 psig from mlv 8l-2. Excavation machinery was brought on site and began excavation. The pipe was found sitting on a rock and gas was escaping from that location. The blow down continued to a slight positive pressure. A tempory patch was put over the hole for the night. The following morning the pipe was cut and a 7.81 ft pup was installed.
Detailed record list
Report Received Date
2011-06-15 00:00:00
Iyear
2011
Report Number
20110184
Supplemental Number
15275
Report Type
Supplemental Final
Operator Id
13845
Name
Northwest Pipeline Corp (Wgp)
Operator Street Address
2800 Post Oak Blvd
Operator City Name
Houston
Operator State Abbreviation
TX
Operator Postal Code
77056
Local Datetime
2011-05-24 12:30:00
Location Latitude
42.62059498
Location Longitude
-111.8576021
Nrc Rpt Num
977297
Nrc Rpt Datetime
2011-05-24 17:47:00
Commodity Released Type
Natural Gas
Unintentional Release
1920
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Shutdown Due Accident Ind
Yes
Shutdown Datetime
2011-05-24 18:48:00
Restart Datetime
2011-06-21 14:00:00
Ignite Ind
No
Explode Ind
No
Num Pub Evacuated
0
Incident Identified Datetime
2011-05-24 12:30:00
On Site Datetime
2011-05-24 12:30:00
On Off Shore
Onshore
Onshore State Abbreviation
Id
Onshore Postal Code
83246
Onshore City Name
Lava
Onshore County Name
Caribou
Designated Location
Milepost
Designated Name
M.p. 554.6
Pipe Fac Name
Ignacio To Sumas 1401 Loop Line
Segment Name
1401 Ln Mlv 8l1 To 8l2
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
0.25
Pipe Smys
60000
Pipe Specification
Api 5l Grade X60
Pipe Seam Type
Longitudinal Erw - High Frequency
Pipe Manufacturer
American Pipe
Pipe Coating Type
Epoxy
Installation Year
1992
Manufactured Year
1992
Material Involved
Carbon Steel
Release Type
Leak
Leak Type
Crack
Class Location Type
Class 1 Location
Could Be Hca
No
Pir Radius
445
Heat Damage Ind
No
Non Heat Damage Ind
No
Hca Fatalities Ind
No
Est Cost Oper Paid
0
Est Cost Unintentional Release
7680
Est Cost Intentional Release
62180
Est Cost Prop Damage
68500
Est Cost Emergency
0
Est Cost Other
0
Prpty
138360
Accident Psig
713
Mop Psig
850
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
87869
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
Air Patrol
Operator Type
Contractor Working For The Operator
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 pipe was sitting on a rock that dented the pipe creating a crack in the pipe causing a slow leak. The gas release was so minute, it was not detectable with the scada monitored system.
Employee Drug Test Ind
No
Contractor Drug Test Ind
No
Cause
Material Failure Of Pipe Or Weld
Cause Details
Design-, Construction-, Installation-, Or Fabrication-Related
Pwjf Failure Type
Design-, Construction-, Installation-, Or Fabrication-Related
Field Exam Ind
Yes
Mechanical Stress
Yes
Additional Dent Ind
Yes
Additional Crack Ind
Yes
Collected Data Ind
Yes
Axial Magnetic Flx Lkg Ind
Yes
Geometry Deformation Ind
Yes
Axial Recent Year
2010
Geometry Recent Year
2010
Has Hydrtst Conduc Before Ind
No
Direct Asmnt Conducted
No
Non Destructive Exam Ind
No
Preparer Name
B*** S****
Preparer Title
Senior Technical Specialist
Preparer Email
B*********@w*******.com
Preparer Telephone
801-584-6741
Authorizer Name
B*** S****
Authorizer Title
Senior Technical Specialist
Authorizer Telephone
801-584-6741
Authorizer Email
B*********@w*******.com
Narrative
During the annual pocatello air patrol of the pipeline, a location with dead vegetation was identified at mile post 554.6. A ground patrol was sent to investigate and found the dead vegetation and used a flame pack to identify leaking gas. By probing and sniffing, it was determined that the leak was on the 24" 1401 loop line. The pipeline was immediately blown down to 43 psig from mlv 8l-2. Excavation machinery was brought on site and began excavation. The pipe was found sitting on a rock and gas was escaping from that location. The blow down continued to a slight positive pressure. A tempory patch was put over the hole for the night. The following morning the pipe was cut and a 7.81 ft pup was installed.
| Report Received Date | 2011-06-15 00:00:00 |
|---|---|
| Iyear | 2011 |
| Report Number | 20110184 |
| Supplemental Number | 15275 |
| Report Type | Supplemental Final |
| Operator Id | 13845 PHMSA Enforcement |
| Name | Northwest Pipeline Corp (Wgp) |
| Operator Street Address | 2800 Post Oak Blvd |
| Operator City Name | Houston |
| Operator State Abbreviation | TX |
| Operator Postal Code | 77056 |
| Local Datetime | 2011-05-24 12:30:00 |
| Location Latitude | 42.62059498 Google Maps OpenStreetMap |
| Location Longitude | -111.8576021 Google Maps OpenStreetMap |
| Nrc Rpt Num | 977297 NRC Report How to search |
| Nrc Rpt Datetime | 2011-05-24 17:47:00 |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 1920 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Shutdown Due Accident Ind | Yes |
| Shutdown Datetime | 2011-05-24 18:48:00 |
| Restart Datetime | 2011-06-21 14:00:00 |
| Ignite Ind | No |
| Explode Ind | No |
| Num Pub Evacuated | 0 |
| Incident Identified Datetime | 2011-05-24 12:30:00 |
| On Site Datetime | 2011-05-24 12:30:00 |
| On Off Shore | Onshore |
| Onshore State Abbreviation | Id |
| Onshore Postal Code | 83246 |
| Onshore City Name | Lava |
| Onshore County Name | Caribou |
| Designated Location | Milepost |
| Designated Name | M.p. 554.6 |
| Pipe Fac Name | Ignacio To Sumas 1401 Loop Line |
| Segment Name | 1401 Ln Mlv 8l1 To 8l2 |
| 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 | 0.25 |
| Pipe Smys | 60000 |
| Pipe Specification | Api 5l Grade X60 |
| Pipe Seam Type | Longitudinal Erw - High Frequency |
| Pipe Manufacturer | American Pipe |
| Pipe Coating Type | Epoxy |
| Installation Year | 1992 |
| Manufactured Year | 1992 |
| Material Involved | Carbon Steel |
| Release Type | Leak |
| Leak Type | Crack |
| Class Location Type | Class 1 Location |
| Could Be Hca | No |
| Pir Radius | 445 |
| Heat Damage Ind | No |
| Non Heat Damage Ind | No |
| Hca Fatalities Ind | No |
| Est Cost Oper Paid | 0 |
| Est Cost Unintentional Release | 7680 |
| Est Cost Intentional Release | 62180 |
| Est Cost Prop Damage | 68500 |
| Est Cost Emergency | 0 |
| Est Cost Other | 0 |
| Prpty | 138360 |
| Accident Psig | 713 |
| Mop Psig | 850 |
| 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 | 87869 |
| 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 | Air Patrol |
| Operator Type | Contractor Working For The Operator |
| 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 pipe was sitting on a rock that dented the pipe creating a crack in the pipe causing a slow leak. The gas release was so minute, it was not detectable with the scada monitored system. |
| Employee Drug Test Ind | No |
| Contractor Drug Test Ind | No |
| Cause | Material Failure Of Pipe Or Weld |
| Cause Details | Design-, Construction-, Installation-, Or Fabrication-Related |
| Pwjf Failure Type | Design-, Construction-, Installation-, Or Fabrication-Related |
| Field Exam Ind | Yes |
| Mechanical Stress | Yes |
| Additional Dent Ind | Yes |
| Additional Crack Ind | Yes |
| Collected Data Ind | Yes |
| Axial Magnetic Flx Lkg Ind | Yes |
| Geometry Deformation Ind | Yes |
| Axial Recent Year | 2010 |
| Geometry Recent Year | 2010 |
| Has Hydrtst Conduc Before Ind | No |
| Direct Asmnt Conducted | No |
| Non Destructive Exam Ind | No |
| Preparer Name | B*** S**** |
| Preparer Title | Senior Technical Specialist |
| Preparer Email | B*********@w*******.com |
| Preparer Telephone | 801-584-6741 |
| Authorizer Name | B*** S**** |
| Authorizer Title | Senior Technical Specialist |
| Authorizer Telephone | 801-584-6741 |
| Authorizer Email | B*********@w*******.com |
| Narrative | During the annual pocatello air patrol of the pipeline, a location with dead vegetation was identified at mile post 554.6. A ground patrol was sent to investigate and found the dead vegetation and used a flame pack to identify leaking gas. By probing and sniffing, it was determined that the leak was on the 24" 1401 loop line. The pipeline was immediately blown down to 43 psig from mlv 8l-2. Excavation machinery was brought on site and began excavation. The pipe was found sitting on a rock and gas was escaping from that location. The blow down continued to a slight positive pressure. A tempory patch was put over the hole for the night. The following morning the pipe was cut and a 7.81 ft pup was installed. |
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