Incident details
Operator, cause, commodity and consequences with raw source fields.
GTG incident on 2024-03-06 — OK
Operator
Transcontinental Gas Pipe Line Company
Cause
Material Failure Of Pipe Or Weld
Commodity
Natural Gas
Program
GTG
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$205,000
Incident datetime
2024-03-06 00:00 UTC
Report number
Location
OK
Narrative
On friday, february 9th, 2024, williams called the nrc to report an incident north of station 190 near milepost 1655 on transco mainline a, original nrc# 1391164. A gas smell was reported thursday, february 8th, 2024. Williams employees headed to the scene to investigate the same day but were unable to locate the leak. Operations continued to look for the leak and located it the following morning on friday, february 9th, 2024. The affected section of the line was subsequently isolated within 3 hours after the leak was identified. Release rate is currently estimated at 2342 scf per day. Equipment was mobilized to site to drawdown and excavate. Drawdown began sunday, february 11th, 2024 and was completed on the 13th. Excavation was subsequently started the same day. Excavation and draw down was completed on the 14th. Blowdown occurred on the 14th and cut-out/tie-in was done on the 15th. On february 16th, 2024 the coating process was completed and the line was placed back in service. An investigation and root cause was conducted to identify the cause of the failure. After the investigation and resulting metallurgical analysis, the leak originated within an original manufacturing mill weld repair or "squirt weld" pass applied to the dsaw seam weld immediately upstream of the girth weld provided. The leak was the result of solidification cracks present within the external and internal seam weld pass that were positioned immediately adjacent to one another.
Detailed record list
Report Received Date
2024-03-06 00:00:00
Iyear
2024
Report Number
20240030
Supplemental Number
39528
Report Type
Supplemental Final
Operator Id
19570
Name
Transcontinental Gas Pipe Line Company
Operator Street Address
One Williams Center Md 43-4
Operator City Name
Tulsa
Operator State Abbreviation
OK
Operator Postal Code
74172
Time Zone
Eastern
Daylight Savings Ind
No
Location Latitude
39.544498
Location Longitude
-76.614698
Nrc Rpt Num
1391164
Additional Nrc Report Numbers
1391251
Commodity Released Type
Natural Gas
Unintentional Release
16
Intentional Release
4000
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
Yes
Communication State Fed Ind
No
Ignite Ind
No
Upstream Action Taken
Valve Closure
Downstream Action Taken
Valve Closure
Num Pub Evacuated
0
On Off Shore
Onshore
Onshore State Abbreviation
Md
Onshore Postal Code
21152
Onshore City Name
Sparks
Onshore County Name
Harford
Designated Location
Milepost
Designated Name
1655
Pipe Fac Name
Transco Pipeline
Segment Name
Main A
Federal
No
Location Type
Pipeline Right-Of-Way
Incident Area Type
Underground
Incident Area Subtype
Under Soil
Depth Of Cover
33
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
30
Pipe Wall Thickness
0.312
Pipe Smys
52000
Pipe Specification
X52
Pipe Seam Type
Dsaw
Pipe Manufacturer
Consolidated Western Steel Corporation
Pipe Coating Type
Asphalt
Coating Applied Ind
Yes
Installation Year
1950
Manufactured Year
1949
Material Involved
Carbon Steel
Release Type
Leak
Leak Type
Pinhole
Class Location Type
Class 1 Location
Could Be Hca
No
Pir Radius
578
Heat Damage Ind
No
Non Heat Damage Ind
No
Did Occur In Mca Ind
No
Est Cost Oper Paid
0
Est Cost Unintentional Release
48
Est Cost Intentional Release
12000
Est Cost Prop Damage
205000
Est Cost Emergency
0
Est Cost Other
0
Gas Cost In Mcf
3
Prpty
217048
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
678
Gas Flow In Pipe In Mcf
720000
Mop Psig
780
Mop Cfr Section
192.619(A)(1)
Maop Established Date
1985-06-15 00:00:00
Maop Reversal Flow Ind
No
Accident Pressure
Pressure Did Not Exceed Maop
Pressure Restriction Ind
No
Gas Required Odorized Ind
No
Upstream Valve Type Ind
Manual
Downstream Valve Type Ind
Manual
Length Segment Isolated
56074
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
Local Operating Personnel, Including Contractors
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
Volume was not high enough for controller to be involved
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)
Metallurgical Ind
Yes
Additional Crack Ind
Yes
Post Constr Pressure Test Val
986
Collected Data Ind
Yes
Axial Magnetic Flx Lkg Ind
Yes
Cir Trn Wave Mgn Flx Lkg Ind
Yes
Geometry Deformation Ind
Yes
Emat Ind
Yes
Axial Recent Year
2018
Axial Rcnt Propul Method
Free Swimming
Axial Rcnt Attuned Detect
Metal Loss
Axial Rcnt Atnd Dtct Metal
High Resolution
Axial Previous Year
2011
Axial Prev Propul Method
Free Swimming
Axial Prev Attuned Detect
Metal Loss
Axial Prev Atnd Dtct Metal
Standard Resolution
Circ Wave Recent Year
2020
Circ Wv Rcnt Propul Method
Free Swimming
Circ Wv Rcnt Resolution
High Resolution
Geometry Recent Year
2018
Geometry Rcnt Propul Method
Free Swimming
Geometry Rcnt Resolution
High Resolution
Geometrt Rcnt Measur Cups
No Cups
Geometry Previous Year
2011
Geometry Prev Propul Method
Free Swimming
Geometry Prev Resolution
Standard Resolution
Geometrt Prev Measur Cups
No Cups
Emat Recent Year
2020
Emat Rcnt Propul Method
Free Swimming
Has Hydrtst Conduc Before Ind
Yes
Hydrtst Most Rcnt Year
1985
Hydrtst Most Rcnt Pressure
986
Direct Asmnt Conducted
No
Non Destructive Exam Ind
No
Preparer Name
M**** J****
Preparer Title
Pipeline Safety Engineer
Preparer Email
M**********@w*******.com
Preparer Telephone
3464264106
Authorizer Name
J*** B***
Authorizer Title
Manager Pipeline Safety
Authorizer Telephone
3373179145
Authorizer Email
J********@w*******.com
Narrative
On friday, february 9th, 2024, williams called the nrc to report an incident north of station 190 near milepost 1655 on transco mainline a, original nrc# 1391164. A gas smell was reported thursday, february 8th, 2024. Williams employees headed to the scene to investigate the same day but were unable to locate the leak. Operations continued to look for the leak and located it the following morning on friday, february 9th, 2024. The affected section of the line was subsequently isolated within 3 hours after the leak was identified. Release rate is currently estimated at 2342 scf per day. Equipment was mobilized to site to drawdown and excavate. Drawdown began sunday, february 11th, 2024 and was completed on the 13th. Excavation was subsequently started the same day. Excavation and draw down was completed on the 14th. Blowdown occurred on the 14th and cut-out/tie-in was done on the 15th. On february 16th, 2024 the coating process was completed and the line was placed back in service. An investigation and root cause was conducted to identify the cause of the failure. After the investigation and resulting metallurgical analysis, the leak originated within an original manufacturing mill weld repair or "squirt weld" pass applied to the dsaw seam weld immediately upstream of the girth weld provided. The leak was the result of solidification cracks present within the external and internal seam weld pass that were positioned immediately adjacent to one another.
| Report Received Date | 2024-03-06 00:00:00 |
|---|---|
| Iyear | 2024 |
| Report Number | 20240030 |
| Supplemental Number | 39528 |
| Report Type | Supplemental Final |
| Operator Id | 19570 PHMSA Enforcement |
| Name | Transcontinental Gas Pipe Line Company |
| Operator Street Address | One Williams Center Md 43-4 |
| Operator City Name | Tulsa |
| Operator State Abbreviation | OK |
| Operator Postal Code | 74172 |
| Time Zone | Eastern |
| Daylight Savings Ind | No |
| Location Latitude | 39.544498 Google Maps OpenStreetMap |
| Location Longitude | -76.614698 Google Maps OpenStreetMap |
| Nrc Rpt Num | 1391164 NRC Report How to search |
| Additional Nrc Report Numbers | 1391251 |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 16 |
| Intentional Release | 4000 |
| 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 | Yes |
| Communication State Fed Ind | No |
| Ignite Ind | No |
| Upstream Action Taken | Valve Closure |
| Downstream Action Taken | Valve Closure |
| Num Pub Evacuated | 0 |
| On Off Shore | Onshore |
| Onshore State Abbreviation | Md |
| Onshore Postal Code | 21152 |
| Onshore City Name | Sparks |
| Onshore County Name | Harford |
| Designated Location | Milepost |
| Designated Name | 1655 |
| Pipe Fac Name | Transco Pipeline |
| Segment Name | Main A |
| Federal | No |
| Location Type | Pipeline Right-Of-Way |
| Incident Area Type | Underground |
| Incident Area Subtype | Under Soil |
| Depth Of Cover | 33 |
| 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 | 30 |
| Pipe Wall Thickness | 0.312 |
| Pipe Smys | 52000 |
| Pipe Specification | X52 |
| Pipe Seam Type | Dsaw |
| Pipe Manufacturer | Consolidated Western Steel Corporation |
| Pipe Coating Type | Asphalt |
| Coating Applied Ind | Yes |
| Installation Year | 1950 |
| Manufactured Year | 1949 |
| Material Involved | Carbon Steel |
| Release Type | Leak |
| Leak Type | Pinhole |
| Class Location Type | Class 1 Location |
| Could Be Hca | No |
| Pir Radius | 578 |
| Heat Damage Ind | No |
| Non Heat Damage Ind | No |
| Did Occur In Mca Ind | No |
| Est Cost Oper Paid | 0 |
| Est Cost Unintentional Release | 48 |
| Est Cost Intentional Release | 12000 |
| Est Cost Prop Damage | 205000 |
| Est Cost Emergency | 0 |
| Est Cost Other | 0 |
| Gas Cost In Mcf | 3 |
| Prpty | 217048 |
| 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 | 678 |
| Gas Flow In Pipe In Mcf | 720000 |
| Mop Psig | 780 |
| Mop Cfr Section | 192.619(A)(1) View CFR 49 §192 |
| Maop Established Date | 1985-06-15 00:00:00 |
| Maop Reversal Flow Ind | No |
| Accident Pressure | Pressure Did Not Exceed Maop |
| Pressure Restriction Ind | No |
| Gas Required Odorized Ind | No |
| Upstream Valve Type Ind | Manual |
| Downstream Valve Type Ind | Manual |
| Length Segment Isolated | 56074 |
| 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 | Local Operating Personnel, Including Contractors |
| 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 | Volume was not high enough for controller to be involved |
| 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) |
| Metallurgical Ind | Yes |
| Additional Crack Ind | Yes |
| Post Constr Pressure Test Val | 986 |
| Collected Data Ind | Yes |
| Axial Magnetic Flx Lkg Ind | Yes |
| Cir Trn Wave Mgn Flx Lkg Ind | Yes |
| Geometry Deformation Ind | Yes |
| Emat Ind | Yes |
| Axial Recent Year | 2018 |
| Axial Rcnt Propul Method | Free Swimming |
| Axial Rcnt Attuned Detect | Metal Loss |
| Axial Rcnt Atnd Dtct Metal | High Resolution |
| Axial Previous Year | 2011 |
| Axial Prev Propul Method | Free Swimming |
| Axial Prev Attuned Detect | Metal Loss |
| Axial Prev Atnd Dtct Metal | Standard Resolution |
| Circ Wave Recent Year | 2020 |
| Circ Wv Rcnt Propul Method | Free Swimming |
| Circ Wv Rcnt Resolution | High Resolution |
| Geometry Recent Year | 2018 |
| Geometry Rcnt Propul Method | Free Swimming |
| Geometry Rcnt Resolution | High Resolution |
| Geometrt Rcnt Measur Cups | No Cups |
| Geometry Previous Year | 2011 |
| Geometry Prev Propul Method | Free Swimming |
| Geometry Prev Resolution | Standard Resolution |
| Geometrt Prev Measur Cups | No Cups |
| Emat Recent Year | 2020 |
| Emat Rcnt Propul Method | Free Swimming |
| Has Hydrtst Conduc Before Ind | Yes |
| Hydrtst Most Rcnt Year | 1985 |
| Hydrtst Most Rcnt Pressure | 986 |
| Direct Asmnt Conducted | No |
| Non Destructive Exam Ind | No |
| Preparer Name | M**** J**** |
| Preparer Title | Pipeline Safety Engineer |
| Preparer Email | M**********@w*******.com |
| Preparer Telephone | 3464264106 |
| Authorizer Name | J*** B*** |
| Authorizer Title | Manager Pipeline Safety |
| Authorizer Telephone | 3373179145 |
| Authorizer Email | J********@w*******.com |
| Narrative | On friday, february 9th, 2024, williams called the nrc to report an incident north of station 190 near milepost 1655 on transco mainline a, original nrc# 1391164. A gas smell was reported thursday, february 8th, 2024. Williams employees headed to the scene to investigate the same day but were unable to locate the leak. Operations continued to look for the leak and located it the following morning on friday, february 9th, 2024. The affected section of the line was subsequently isolated within 3 hours after the leak was identified. Release rate is currently estimated at 2342 scf per day. Equipment was mobilized to site to drawdown and excavate. Drawdown began sunday, february 11th, 2024 and was completed on the 13th. Excavation was subsequently started the same day. Excavation and draw down was completed on the 14th. Blowdown occurred on the 14th and cut-out/tie-in was done on the 15th. On february 16th, 2024 the coating process was completed and the line was placed back in service. An investigation and root cause was conducted to identify the cause of the failure. After the investigation and resulting metallurgical analysis, the leak originated within an original manufacturing mill weld repair or "squirt weld" pass applied to the dsaw seam weld immediately upstream of the girth weld provided. The leak was the result of solidification cracks present within the external and internal seam weld pass that were positioned immediately adjacent to one another. |
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