Incident details
Operator, cause, commodity and consequences with raw source fields.
GTG incident on 2023-09-11 — NE
Operator
Northern Natural Gas Co
Cause
Corrosion Failure
Commodity
Natural Gas
Program
GTG
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$865,000
Incident datetime
2023-09-11 00:00 UTC
Report number
Location
NE
Narrative
On august 16, 2023, nng gas control received alarms of low pressure and zero flow at multiple stations in the seminole subsystem, upstream of the kermit, tx, compressor station. The gas controllers contacted customers in the area confirming the pressure and flow deviations. Nng operations communications center contacted the field operations team on-call technician to investigate the alarms. Nng was notified by local authorities of blowing gas and fire near coyanosa, tx. This confirmed the incident with nng gas control. Nng operations communication center initiated an all-call to the kermit, tx, field operations team to respond to the emergency. Nng gas control completed shutting-in all receipt and delivery points. The field operations team closed block valve 3 which completed the isolation of the affected segment. First responders closed two roads in the process. The fire from the failure was reduced to burning residual gas within 75 minutes of the segment being isolated. Based on lab results, the pipeline ruptured initially in approximately the 6 o'clock position in an area, about a foot long, of severe, mostly circular, pitting and corrosion. This pitting bears all the hallmarks of microbiologically influenced corrosion (mic), a process where one or several strains of bacteria corrode steel. The material had been corroded to approximately 0.041" wall thickness at the rupture origin, approximately 12% of the original material thickness. Further examinations of the material did not locate any other failure mechanism.
Detailed record list
Report Received Date
2023-09-11 00:00:00
Iyear
2023
Report Number
20230087
Supplemental Number
38917
Report Type
Supplemental Final
Operator Id
13750
Name
Northern Natural Gas Co
Operator Street Address
1111 South 103rd Street
Operator City Name
Omaha
Operator State Abbreviation
NE
Operator Postal Code
68124
Time Zone
Central
Daylight Savings Ind
Yes
Location Latitude
31.38328
Location Longitude
-103.04836
Nrc Rpt Num
1376310
Additional Nrc Report Numbers
1376514
Commodity Released Type
Natural Gas
Unintentional Release
87500
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
Yes
Still Shutdown Ind
Yes
Communication State Fed Ind
Yes
Party Initiated Communication
Local/state/federal Emergency Responder
Ignite Ind
Yes
How Extinguished
Allowed To Burn Out
Gas Consumed By Fire In Mcf
87500
Explode Ind
Yes
Upstream Action Taken
Valve Closure
Downstream Action Taken
Valve Closure
Num Pub Evacuated
0
On Off Shore
Onshore
Onshore State Abbreviation
Tx
Onshore Postal Code
79722
Onshore City Name
Not Within A Municipality
Onshore County Name
Reeves
Designated Location
Milepost
Designated Name
13.84
Pipe Fac Name
M855c Coyanosa Valve #1 To Kermit
Segment Name
Txm46202
Federal
No
Location Type
Pipeline Right-Of-Way
Incident Area Type
Underground
Incident Area Subtype
Under Soil
Depth Of Cover
48
Other Underground Facilities
No
Crossing
No
Pipe Facility Type
Interstate
System Part Involved
Onshore Pipeline, Including Valve Sites
Item Involved
Pipe
Pipe Type
Pipe Body
Pipe Diameter
30
Puddle Weld Ind
No
Pipe Wall Thickness
0.321
Pipe Smys
65000
Pipe Specification
Api 5lx
Pipe Seam Type
Flash Welded
Pipe Manufacturer
Ao Smith
Pipe Coating Type
Asphalt
Coating Applied Ind
Yes
Installation Year
1968
Manufactured Year
Unknown
Material Involved
Carbon Steel
Release Type
Rupture
Rupture Orient
Longitudinal
Rupture Length
1080
Rupture Width
94.2
Class Location Type
Class 1 Location
Could Be Hca
No
Pir Radius
693
Heat Damage Ind
No
Non Heat Damage Ind
No
Did Occur In Mca Ind
No
Est Cost Oper Paid
0
Est Cost Unintentional Release
187688
Est Cost Intentional Release
0
Est Cost Prop Damage
865000
Est Cost Emergency
50000
Est Cost Other
0
Gas Cost In Mcf
2.145
Prpty
1102688
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
Yes
Terrestrial Impact Ind
Yes
Accident Psig
930
Gas Flow In Pipe In Mcf
105580
Mop Psig
1000
Mop Cfr Section
192.619(A)(2)
Maop Established Date
1968-11-01 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
Remotely Controlled
Downstream Valve Type Ind
Manual
Length Segment Isolated
75754
Internal Inspection Ind
No
Unsuitable Mainline Ind
Yes
Other Restrictions 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
Yes
Scada Conf Ind
Yes
Accident Identifier
Scada-Based Information (Such As Alarm(S), Alert(S), Event(S), And/or Volume Or Pack Calculations)
Investigation Status
Yes, specify investigation result(s): (select all that apply)
Invest Schedule Ind
Yes
Invest No Control Room Ind
Yes
Invest No Controller Ind
Yes
Employee Drug Test Ind
No
Contractor Drug Test Ind
No
Cause
Corrosion Failure
Cause Details
External Corrosion
Internal External
External Corrosion
Visual Exam Results
Localized Pitting
Microbiological Corrosion Ind
Yes
Metallurgical Basis Ind
Yes
Underground Location
Yes
Under Cathodic Protection Ind
Yes
Cathodic Pro Start Year
1968
Shielding Evident
Yes
Cathodic Survey Type
Yes
Close Interval Survey Ind
Yes
Close Interval Survey Year
2023
Prior Damage
No
Collected Data Ind
No
Has Hydrtst Conduc Before Ind
No
Direct Asmnt Conducted
No
Non Destructive Exam Ind
No
Preparer Name
K**** G***
Preparer Title
Pipeline Safety Specialist
Preparer Email
K*********@n****.com
Preparer Telephone
15152025067
Local Contact Name
K**** G***
Local Contact Email
K*********@n****.com
Local Contact Telephone
15152025067
Authorizer Name
T** C******
Authorizer Title
Vp Of Pipeline Safety And Risk
Authorizer Telephone
4023987715
Authorizer Email
T*************@n****.com
Narrative
On august 16, 2023, nng gas control received alarms of low pressure and zero flow at multiple stations in the seminole subsystem, upstream of the kermit, tx, compressor station. The gas controllers contacted customers in the area confirming the pressure and flow deviations. Nng operations communications center contacted the field operations team on-call technician to investigate the alarms. Nng was notified by local authorities of blowing gas and fire near coyanosa, tx. This confirmed the incident with nng gas control. Nng operations communication center initiated an all-call to the kermit, tx, field operations team to respond to the emergency. Nng gas control completed shutting-in all receipt and delivery points. The field operations team closed block valve 3 which completed the isolation of the affected segment. First responders closed two roads in the process. The fire from the failure was reduced to burning residual gas within 75 minutes of the segment being isolated. Based on lab results, the pipeline ruptured initially in approximately the 6 o'clock position in an area, about a foot long, of severe, mostly circular, pitting and corrosion. This pitting bears all the hallmarks of microbiologically influenced corrosion (mic), a process where one or several strains of bacteria corrode steel. The material had been corroded to approximately 0.041" wall thickness at the rupture origin, approximately 12% of the original material thickness. Further examinations of the material did not locate any other failure mechanism.
| Report Received Date | 2023-09-11 00:00:00 |
|---|---|
| Iyear | 2023 |
| Report Number | 20230087 |
| Supplemental Number | 38917 |
| Report Type | Supplemental Final |
| Operator Id | 13750 PHMSA Enforcement |
| Name | Northern Natural Gas Co |
| Operator Street Address | 1111 South 103rd Street |
| Operator City Name | Omaha |
| Operator State Abbreviation | NE |
| Operator Postal Code | 68124 |
| Time Zone | Central |
| Daylight Savings Ind | Yes |
| Location Latitude | 31.38328 Google Maps OpenStreetMap |
| Location Longitude | -103.04836 Google Maps OpenStreetMap |
| Nrc Rpt Num | 1376310 NRC Report How to search |
| Additional Nrc Report Numbers | 1376514 |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 87500 |
| 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 | Yes |
| Still Shutdown Ind | Yes |
| Communication State Fed Ind | Yes |
| Party Initiated Communication | Local/state/federal Emergency Responder |
| Ignite Ind | Yes |
| How Extinguished | Allowed To Burn Out |
| Gas Consumed By Fire In Mcf | 87500 |
| Explode Ind | Yes |
| Upstream Action Taken | Valve Closure |
| Downstream Action Taken | Valve Closure |
| Num Pub Evacuated | 0 |
| On Off Shore | Onshore |
| Onshore State Abbreviation | Tx |
| Onshore Postal Code | 79722 |
| Onshore City Name | Not Within A Municipality |
| Onshore County Name | Reeves |
| Designated Location | Milepost |
| Designated Name | 13.84 |
| Pipe Fac Name | M855c Coyanosa Valve #1 To Kermit |
| Segment Name | Txm46202 |
| Federal | No |
| Location Type | Pipeline Right-Of-Way |
| Incident Area Type | Underground |
| Incident Area Subtype | Under Soil |
| Depth Of Cover | 48 |
| Other Underground Facilities | No |
| Crossing | No |
| Pipe Facility Type | Interstate |
| System Part Involved | Onshore Pipeline, Including Valve Sites |
| Item Involved | Pipe |
| Pipe Type | Pipe Body |
| Pipe Diameter | 30 |
| Puddle Weld Ind | No |
| Pipe Wall Thickness | 0.321 |
| Pipe Smys | 65000 |
| Pipe Specification | Api 5lx |
| Pipe Seam Type | Flash Welded |
| Pipe Manufacturer | Ao Smith |
| Pipe Coating Type | Asphalt |
| Coating Applied Ind | Yes |
| Installation Year | 1968 |
| Manufactured Year | Unknown |
| Material Involved | Carbon Steel |
| Release Type | Rupture |
| Rupture Orient | Longitudinal |
| Rupture Length | 1080 |
| Rupture Width | 94.2 |
| Class Location Type | Class 1 Location |
| Could Be Hca | No |
| Pir Radius | 693 |
| Heat Damage Ind | No |
| Non Heat Damage Ind | No |
| Did Occur In Mca Ind | No |
| Est Cost Oper Paid | 0 |
| Est Cost Unintentional Release | 187688 |
| Est Cost Intentional Release | 0 |
| Est Cost Prop Damage | 865000 |
| Est Cost Emergency | 50000 |
| Est Cost Other | 0 |
| Gas Cost In Mcf | 2.145 |
| Prpty | 1102688 |
| 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 | Yes |
| Terrestrial Impact Ind | Yes |
| Accident Psig | 930 |
| Gas Flow In Pipe In Mcf | 105580 |
| Mop Psig | 1000 |
| Mop Cfr Section | 192.619(A)(2) View CFR 49 §192 |
| Maop Established Date | 1968-11-01 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 | Remotely Controlled |
| Downstream Valve Type Ind | Manual |
| Length Segment Isolated | 75754 |
| Internal Inspection Ind | No |
| Unsuitable Mainline Ind | Yes |
| Other Restrictions 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 | Yes |
| Scada Conf Ind | Yes |
| Accident Identifier | Scada-Based Information (Such As Alarm(S), Alert(S), Event(S), And/or Volume Or Pack Calculations) |
| Investigation Status | Yes, specify investigation result(s): (select all that apply) |
| Invest Schedule Ind | Yes |
| Invest No Control Room Ind | Yes |
| Invest No Controller Ind | Yes |
| Employee Drug Test Ind | No |
| Contractor Drug Test Ind | No |
| Cause | Corrosion Failure |
| Cause Details | External Corrosion |
| Internal External | External Corrosion |
| Visual Exam Results | Localized Pitting |
| Microbiological Corrosion Ind | Yes |
| Metallurgical Basis Ind | Yes |
| Underground Location | Yes |
| Under Cathodic Protection Ind | Yes |
| Cathodic Pro Start Year | 1968 |
| Shielding Evident | Yes |
| Cathodic Survey Type | Yes |
| Close Interval Survey Ind | Yes |
| Close Interval Survey Year | 2023 |
| Prior Damage | No |
| Collected Data Ind | No |
| Has Hydrtst Conduc Before Ind | No |
| Direct Asmnt Conducted | No |
| Non Destructive Exam Ind | No |
| Preparer Name | K**** G*** |
| Preparer Title | Pipeline Safety Specialist |
| Preparer Email | K*********@n****.com |
| Preparer Telephone | 15152025067 |
| Local Contact Name | K**** G*** |
| Local Contact Email | K*********@n****.com |
| Local Contact Telephone | 15152025067 |
| Authorizer Name | T** C****** |
| Authorizer Title | Vp Of Pipeline Safety And Risk |
| Authorizer Telephone | 4023987715 |
| Authorizer Email | T*************@n****.com |
| Narrative | On august 16, 2023, nng gas control received alarms of low pressure and zero flow at multiple stations in the seminole subsystem, upstream of the kermit, tx, compressor station. The gas controllers contacted customers in the area confirming the pressure and flow deviations. Nng operations communications center contacted the field operations team on-call technician to investigate the alarms. Nng was notified by local authorities of blowing gas and fire near coyanosa, tx. This confirmed the incident with nng gas control. Nng operations communication center initiated an all-call to the kermit, tx, field operations team to respond to the emergency. Nng gas control completed shutting-in all receipt and delivery points. The field operations team closed block valve 3 which completed the isolation of the affected segment. First responders closed two roads in the process. The fire from the failure was reduced to burning residual gas within 75 minutes of the segment being isolated. Based on lab results, the pipeline ruptured initially in approximately the 6 o'clock position in an area, about a foot long, of severe, mostly circular, pitting and corrosion. This pitting bears all the hallmarks of microbiologically influenced corrosion (mic), a process where one or several strains of bacteria corrode steel. The material had been corroded to approximately 0.041" wall thickness at the rupture origin, approximately 12% of the original material thickness. Further examinations of the material did not locate any other failure mechanism. |
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