Incident details
Operator, cause, commodity and consequences with raw source fields.
GTG incident on 2024-08-28 — TX
Operator
Northwest Pipeline Llc
Cause
Material Failure Of Pipe Or Weld
Commodity
Natural Gas
Program
GTG
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$200,000
Incident datetime
2024-08-28 00:00 UTC
Report number
Location
TX
Narrative
On friday august, 2 2024 at 10:59 am, dig 32020 was being excavated at mp 1153.5 on the ignacio to sumas mainline line 1400. This work is part of the 2024 goldendale to willard anomaly digs. During excavation, personnel heard the sound of gas blowing through a hole. The excavation was stopped and it was investigated using gas detectors. Lel was picked up on gas monitors, and the leak location was confirmed using liquid leak detect agent. A leak clamp was not readily available, so the crew demobilized for the day. The following morning, the excavation was completed by hand while monitoring for lel. Initial investigation indicates a manufacturing defect in the long seam of the dsaw pipe. A temporary plidco leak clamp was successfully installed on 8/3/24, at 10:30 am. Permanent repair by cutout is expected to be completed in the future.
Detailed record list
Report Received Date
2024-08-28 00:00:00
Iyear
2024
Report Number
20240104
Supplemental Number
39947
Report Type
Original
Operator Id
13845
Name
Northwest Pipeline Llc
Operator Street Address
2800 Post Oak Blvd
Operator City Name
Houston
Operator State Abbreviation
TX
Operator Postal Code
77056
Time Zone
Pacific
Daylight Savings Ind
Yes
Location Latitude
45.7652948
Location Longitude
-121.1975303
Nrc Rpt Num
1406700
Additional Nrc Report Numbers
1406825
Commodity Released Type
Natural Gas
Unintentional Release
700
Intentional Release
0
Accompanying Liquid
0
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Status When Identified
Normal Operation, Includes Pauses During Maintenance
Shutdown Due Accident Ind
No
Shutdown Explain
Small Crack In Long Seam Appears Stable. Temporary Plidco Leak Clamp Installed
Communication State Fed Ind
No
Ignite Ind
No
Upstream Action Taken
Operational Control
Upstream Oprtnl Cntrl Detail
Line Was Already At Reduced Pressure For The Dig. Line Already Isolated For A Near By Project.
Downstream Action Taken
Operational Control
Downstream Oprtnl Cntrl Detail
Line Was Already At Reduced Pressure For The Dig. Line Already Isolated For A Near By Project.
Num Pub Evacuated
0
On Off Shore
Onshore
Onshore State Abbreviation
Wa
Onshore Postal Code
98635
Onshore City Name
Lyle
Onshore County Name
Klickitat
Designated Location
Milepost
Designated Name
1153.5
Pipe Fac Name
Ignacio To Sumas Mainline
Segment Name
1400
Federal
No
Location Type
Pipeline Right-Of-Way
Incident Area Type
Underground
Incident Area Subtype
Exposed Due To Excavation
Depth Of Cover
60
Other Underground Facilities
No
Crossing
No
Pipe Facility Type
Interstate
System Part Involved
Onshore Pipeline, Including Valve Sites
Item Involved
Pipe
Pipe Type
Pipe Seam
Pipe Diameter
26
Pipe Wall Thickness
0.281
Pipe Smys
52000
Pipe Specification
Api 5lx
Pipe Seam Type
Dsaw
Pipe Manufacturer
Consolidated
Pipe Coating Type
Asphalt
Coating Applied Ind
Unknown
Installation Year
1956
Manufactured Year
1955
Material Involved
Carbon Steel
Release Type
Leak
Leak Type
Crack
Class Location Type
Class 1 Location
Could Be Hca
No
Pir Radius
630
Heat Damage Ind
No
Non Heat Damage Ind
No
Did Occur In Mca Ind
No
Est Cost Oper Paid
0
Est Cost Unintentional Release
1750
Est Cost Intentional Release
0
Est Cost Prop Damage
200000
Est Cost Emergency
0
Est Cost Other
0
Gas Cost In Mcf
2.5
Prpty
201750
Num Persons Hosp Not Ovnght
0
Num Injured Treated By Emt
0
Num Resident Building Affctd
0
Num Business Building Affctd
0
Wildlife Impact Ind
No
Accident Psig
610
Gas Flow In Pipe In Mcf
0
Mop Psig
809
Mop Cfr Section
192.619(C)
Maop Established Date
1970-06-30 00:00:00
Maop Reversal Flow Ind
No
Accident Pressure
Pressure Did Not Exceed Maop
Pressure Restriction Ind
No
Gas Required Odorized Ind
No
Length Segment Isolated
85166
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
Other
Accident Details
Dig Investigation Following Ili Tool Survey
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
Leak found during an anomaly dig resulting from an ili inspection. Leak was too small to cause a drop in line pressure.
Employee Drug Test Ind
No
Contractor Drug Test Ind
No
Cause
Material Failure Of Pipe Or Weld
Cause Details
Original Manufacturing-Related (Not Girth Weld Or Other Welds Formed In The Field)
Pwjf Failure Type
Original Manufacturing-Related (Not Girth Weld Or Other Welds Formed In The Field)
Still Under Invest Ind
Yes
Post Constr Pressure Test Val
860
Collected Data Ind
Yes
Axial Magnetic Flx Lkg Ind
Yes
Geometry Deformation Ind
Yes
Emat Ind
Yes
Axial Recent Year
2023
Axial Rcnt Propul Method
Free Swimming
Axial Rcnt Attuned Detect
Metal Loss
Axial Rcnt Atnd Dtct Metal
High Resolution
Axial Previous Year
2019
Axial Prev Propul Method
Free Swimming
Axial Prev Attuned Detect
Metal Loss
Axial Prev Atnd Dtct Metal
High Resolution
Geometry Recent Year
2023
Geometry Rcnt Propul Method
Free Swimming
Geometry Rcnt Resolution
High Resolution
Geometrt Rcnt Measur Cups
No Cups
Geometry Previous Year
2019
Geometry Prev Propul Method
Free Swimming
Geometry Prev Resolution
High Resolution
Geometrt Prev Measur Cups
No Cups
Emat Recent Year
2023
Emat Rcnt Propul Method
Free Swimming
Has Hydrtst Conduc Before Ind
No
Direct Asmnt Conducted
No
Non Destructive Exam Ind
No
Preparer Name
C********** E*****
Preparer Title
Senior Engineer
Preparer Email
C***********@w*******.com
Preparer Telephone
570-406-0743
Authorizer Name
E*** W****
Authorizer Title
Manager Pipeline Safety
Authorizer Telephone
713-215-3459
Authorizer Email
E*********@w*******.com
Narrative
On friday august, 2 2024 at 10:59 am, dig 32020 was being excavated at mp 1153.5 on the ignacio to sumas mainline line 1400. This work is part of the 2024 goldendale to willard anomaly digs. During excavation, personnel heard the sound of gas blowing through a hole. The excavation was stopped and it was investigated using gas detectors. Lel was picked up on gas monitors, and the leak location was confirmed using liquid leak detect agent. A leak clamp was not readily available, so the crew demobilized for the day. The following morning, the excavation was completed by hand while monitoring for lel. Initial investigation indicates a manufacturing defect in the long seam of the dsaw pipe. A temporary plidco leak clamp was successfully installed on 8/3/24, at 10:30 am. Permanent repair by cutout is expected to be completed in the future.
| Report Received Date | 2024-08-28 00:00:00 |
|---|---|
| Iyear | 2024 |
| Report Number | 20240104 |
| Supplemental Number | 39947 |
| Report Type | Original |
| Operator Id | 13845 PHMSA Enforcement |
| Name | Northwest Pipeline Llc |
| Operator Street Address | 2800 Post Oak Blvd |
| Operator City Name | Houston |
| Operator State Abbreviation | TX |
| Operator Postal Code | 77056 |
| Time Zone | Pacific |
| Daylight Savings Ind | Yes |
| Location Latitude | 45.7652948 Google Maps OpenStreetMap |
| Location Longitude | -121.1975303 Google Maps OpenStreetMap |
| Nrc Rpt Num | 1406700 NRC Report How to search |
| Additional Nrc Report Numbers | 1406825 |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 700 |
| Intentional Release | 0 |
| Accompanying Liquid | 0 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Status When Identified | Normal Operation, Includes Pauses During Maintenance |
| Shutdown Due Accident Ind | No |
| Shutdown Explain | Small Crack In Long Seam Appears Stable. Temporary Plidco Leak Clamp Installed |
| Communication State Fed Ind | No |
| Ignite Ind | No |
| Upstream Action Taken | Operational Control |
| Upstream Oprtnl Cntrl Detail | Line Was Already At Reduced Pressure For The Dig. Line Already Isolated For A Near By Project. |
| Downstream Action Taken | Operational Control |
| Downstream Oprtnl Cntrl Detail | Line Was Already At Reduced Pressure For The Dig. Line Already Isolated For A Near By Project. |
| Num Pub Evacuated | 0 |
| On Off Shore | Onshore |
| Onshore State Abbreviation | Wa |
| Onshore Postal Code | 98635 |
| Onshore City Name | Lyle |
| Onshore County Name | Klickitat |
| Designated Location | Milepost |
| Designated Name | 1153.5 |
| Pipe Fac Name | Ignacio To Sumas Mainline |
| Segment Name | 1400 |
| Federal | No |
| Location Type | Pipeline Right-Of-Way |
| Incident Area Type | Underground |
| Incident Area Subtype | Exposed Due To Excavation |
| Depth Of Cover | 60 |
| Other Underground Facilities | No |
| Crossing | No |
| Pipe Facility Type | Interstate |
| System Part Involved | Onshore Pipeline, Including Valve Sites |
| Item Involved | Pipe |
| Pipe Type | Pipe Seam |
| Pipe Diameter | 26 |
| Pipe Wall Thickness | 0.281 |
| Pipe Smys | 52000 |
| Pipe Specification | Api 5lx |
| Pipe Seam Type | Dsaw |
| Pipe Manufacturer | Consolidated |
| Pipe Coating Type | Asphalt |
| Coating Applied Ind | Unknown |
| Installation Year | 1956 |
| Manufactured Year | 1955 |
| Material Involved | Carbon Steel |
| Release Type | Leak |
| Leak Type | Crack |
| Class Location Type | Class 1 Location |
| Could Be Hca | No |
| Pir Radius | 630 |
| Heat Damage Ind | No |
| Non Heat Damage Ind | No |
| Did Occur In Mca Ind | No |
| Est Cost Oper Paid | 0 |
| Est Cost Unintentional Release | 1750 |
| Est Cost Intentional Release | 0 |
| Est Cost Prop Damage | 200000 |
| Est Cost Emergency | 0 |
| Est Cost Other | 0 |
| Gas Cost In Mcf | 2.5 |
| Prpty | 201750 |
| Num Persons Hosp Not Ovnght | 0 |
| Num Injured Treated By Emt | 0 |
| Num Resident Building Affctd | 0 |
| Num Business Building Affctd | 0 |
| Wildlife Impact Ind | No |
| Accident Psig | 610 |
| Gas Flow In Pipe In Mcf | 0 |
| Mop Psig | 809 |
| Mop Cfr Section | 192.619(C) View CFR 49 §192 |
| Maop Established Date | 1970-06-30 00:00:00 |
| Maop Reversal Flow Ind | No |
| Accident Pressure | Pressure Did Not Exceed Maop |
| Pressure Restriction Ind | No |
| Gas Required Odorized Ind | No |
| Length Segment Isolated | 85166 |
| 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 | Other |
| Accident Details | Dig Investigation Following Ili Tool Survey |
| 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 | Leak found during an anomaly dig resulting from an ili inspection. Leak was too small to cause a drop in line pressure. |
| Employee Drug Test Ind | No |
| Contractor Drug Test Ind | No |
| Cause | Material Failure Of Pipe Or Weld |
| Cause Details | Original Manufacturing-Related (Not Girth Weld Or Other Welds Formed In The Field) |
| Pwjf Failure Type | Original Manufacturing-Related (Not Girth Weld Or Other Welds Formed In The Field) |
| Still Under Invest Ind | Yes |
| Post Constr Pressure Test Val | 860 |
| Collected Data Ind | Yes |
| Axial Magnetic Flx Lkg Ind | Yes |
| Geometry Deformation Ind | Yes |
| Emat Ind | Yes |
| Axial Recent Year | 2023 |
| Axial Rcnt Propul Method | Free Swimming |
| Axial Rcnt Attuned Detect | Metal Loss |
| Axial Rcnt Atnd Dtct Metal | High Resolution |
| Axial Previous Year | 2019 |
| Axial Prev Propul Method | Free Swimming |
| Axial Prev Attuned Detect | Metal Loss |
| Axial Prev Atnd Dtct Metal | High Resolution |
| Geometry Recent Year | 2023 |
| Geometry Rcnt Propul Method | Free Swimming |
| Geometry Rcnt Resolution | High Resolution |
| Geometrt Rcnt Measur Cups | No Cups |
| Geometry Previous Year | 2019 |
| Geometry Prev Propul Method | Free Swimming |
| Geometry Prev Resolution | High Resolution |
| Geometrt Prev Measur Cups | No Cups |
| Emat Recent Year | 2023 |
| Emat Rcnt Propul Method | Free Swimming |
| Has Hydrtst Conduc Before Ind | No |
| Direct Asmnt Conducted | No |
| Non Destructive Exam Ind | No |
| Preparer Name | C********** E***** |
| Preparer Title | Senior Engineer |
| Preparer Email | C***********@w*******.com |
| Preparer Telephone | 570-406-0743 |
| Authorizer Name | E*** W**** |
| Authorizer Title | Manager Pipeline Safety |
| Authorizer Telephone | 713-215-3459 |
| Authorizer Email | E*********@w*******.com |
| Narrative | On friday august, 2 2024 at 10:59 am, dig 32020 was being excavated at mp 1153.5 on the ignacio to sumas mainline line 1400. This work is part of the 2024 goldendale to willard anomaly digs. During excavation, personnel heard the sound of gas blowing through a hole. The excavation was stopped and it was investigated using gas detectors. Lel was picked up on gas monitors, and the leak location was confirmed using liquid leak detect agent. A leak clamp was not readily available, so the crew demobilized for the day. The following morning, the excavation was completed by hand while monitoring for lel. Initial investigation indicates a manufacturing defect in the long seam of the dsaw pipe. A temporary plidco leak clamp was successfully installed on 8/3/24, at 10:30 am. Permanent repair by cutout is expected to be completed in the future. |
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