Incident details
Operator, cause, commodity and consequences with raw source fields.
GTG incident on 2025-07-10 — MI
Operator
Dte Gas Company
Cause
Corrosion Failure
Commodity
Natural Gas
Program
GTG
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$208,527
Incident datetime
2025-07-10 00:00 UTC
Report number
Location
MI
Narrative
5/14/25: while hand scraping for maintenance during prior defect identified during in-line-inspection, a leak developed on the alpena 16" transmission line. Pipeline is odorized 16" coated steel x52 0.250 wall thickness, installed in 1964, current maop 812 psig, normal operating 670 psig, pressure reduced to 480 psig prior to maintenance excavation. (original maop was 869 psig, derated in 2017 to 812 psig.) after leak developed, pipeline was blown down to zero pressure and cutout was made. On 5/22/25 repair was completed and pipeline was thereafter returned to service. On 6/11/25, contractor repair costs exceeded PHMSA reporting threshold and the incident was reported to PHMSA/nrc at 2:39pm on the same day (nrc # 1433791).
Detailed record list
Report Received Date
2025-07-10 00:00:00
Iyear
2025
Report Number
20250079
Supplemental Number
41136
Report Type
Original Final
Operator Id
12408
Name
Dte Gas Company
Operator Street Address
1 Energy Plaza
Operator City Name
Detroit
Operator State Abbreviation
MI
Operator Postal Code
48226
Time Zone
Eastern
Daylight Savings Ind
Yes
Location Latitude
44.26425619
Location Longitude
-84.23518588
Nrc Rpt Num
1433791
Additional Nrc Report Numbers
1433955
Commodity Released Type
Natural Gas
Unintentional Release
13.57
Intentional Release
773.3
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
Mi
Onshore Postal Code
48661
Onshore City Name
West Branch
Onshore County Name
Ogemaw
Designated Location
Not Applicable
Pipe Fac Name
Alpena 16" Pipeline
Segment Name
8499
Federal
No
Location Type
Pipeline Right-Of-Way
Incident Area Type
Underground
Incident Area Subtype
Exposed Due To Excavation
Depth Of Cover
47
Other Underground Facilities
No
Crossing
No
Pipe Facility Type
Intrastate
System Part Involved
Onshore Pipeline, Including Valve Sites
Item Involved
Pipe
Pipe Type
Pipe Body
Pipe Diameter
16
Puddle Weld Ind
No
Pipe Wall Thickness
0.25
Pipe Smys
52000
Pipe Specification
Api 5lx
Pipe Seam Type
Longitudinal Erw - High Frequency
Pipe Manufacturer
Stupp
Pipe Coating Type
Other
Pipe Coating Details
Hot Wax
Coating Applied Ind
Unknown
Installation Year
1964
Manufactured Year
1964
Material Involved
Carbon Steel
Release Type
Leak
Leak Type
Pinhole
Class Location Type
Class 3 Location
Could Be Hca
No
Pir Radius
315
Heat Damage Ind
No
Non Heat Damage Ind
No
Did Occur In Mca Ind
No
Est Cost Oper Paid
0
Est Cost Unintentional Release
57
Est Cost Intentional Release
3248
Est Cost Prop Damage
208527
Est Cost Emergency
0
Est Cost Other
0
Gas Cost In Mcf
4.2
Prpty
211832
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
480
Gas Flow In Pipe In Mcf
9960
Mop Psig
812
Mop Cfr Section
192.619(A)(1)
Maop Established Date
2017-12-31 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
15805
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
Operator Employee
Investigation Status
Yes, specify investigation result(s): (select all that apply)
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
General Corrosion
Galvanic Corrosion Ind
Yes
Field Exam Basis Ind
Yes
Underground Location
Yes
Under Cathodic Protection Ind
Yes
Cathodic Pro Start Year
1964
Shielding Evident
Yes
Cathodic Survey Type
Yes
Cp Annual Survey Ind
Yes
Close Interval Survey Ind
Yes
Cp Annual Survey Year
2024
Close Interval Survey Year
2024
Prior Damage
Yes
Collected Data Ind
Yes
Axial Magnetic Flx Lkg Ind
Yes
Cir Trn Wave Mgn Flx Lkg Ind
Yes
Geometry Deformation Ind
Yes
Axial Recent Year
2025
Axial Rcnt Propul Method
Free Swimming
Axial Rcnt Attuned Detect
Metal Loss
Axial Rcnt Atnd Dtct Metal
High Resolution
Circ Wave Recent Year
2025
Circ Wv Rcnt Propul Method
Free Swimming
Circ Wv Rcnt Resolution
High Resolution
Geometry Recent Year
2025
Geometry Rcnt Propul Method
Free Swimming
Geometry Rcnt Resolution
High Resolution
Geometrt Rcnt Measur Cups
No Cups
Has Hydrtst Conduc Before Ind
No
Direct Asmnt Conducted
No
Non Destructive Exam Ind
No
Preparer Name
J***** C M*****
Preparer Title
Engineer
Preparer Email
J************@d********.com
Preparer Telephone
2484621760
Authorizer Name
J***** C M*****
Authorizer Title
Engineer
Authorizer Telephone
2484621760
Authorizer Email
J************@d********.com
Narrative
5/14/25: while hand scraping for maintenance during prior defect identified during in-line-inspection, a leak developed on the alpena 16" transmission line. Pipeline is odorized 16" coated steel x52 0.250 wall thickness, installed in 1964, current maop 812 psig, normal operating 670 psig, pressure reduced to 480 psig prior to maintenance excavation. (original maop was 869 psig, derated in 2017 to 812 psig.) after leak developed, pipeline was blown down to zero pressure and cutout was made. On 5/22/25 repair was completed and pipeline was thereafter returned to service. On 6/11/25, contractor repair costs exceeded PHMSA reporting threshold and the incident was reported to PHMSA/nrc at 2:39pm on the same day (nrc # 1433791).
| Report Received Date | 2025-07-10 00:00:00 |
|---|---|
| Iyear | 2025 |
| Report Number | 20250079 |
| Supplemental Number | 41136 |
| Report Type | Original Final |
| Operator Id | 12408 PHMSA Enforcement |
| Name | Dte Gas Company |
| Operator Street Address | 1 Energy Plaza |
| Operator City Name | Detroit |
| Operator State Abbreviation | MI |
| Operator Postal Code | 48226 |
| Time Zone | Eastern |
| Daylight Savings Ind | Yes |
| Location Latitude | 44.26425619 Google Maps OpenStreetMap |
| Location Longitude | -84.23518588 Google Maps OpenStreetMap |
| Nrc Rpt Num | 1433791 NRC Report How to search |
| Additional Nrc Report Numbers | 1433955 |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 13.57 |
| Intentional Release | 773.3 |
| 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 | Mi |
| Onshore Postal Code | 48661 |
| Onshore City Name | West Branch |
| Onshore County Name | Ogemaw |
| Designated Location | Not Applicable |
| Pipe Fac Name | Alpena 16" Pipeline |
| Segment Name | 8499 |
| Federal | No |
| Location Type | Pipeline Right-Of-Way |
| Incident Area Type | Underground |
| Incident Area Subtype | Exposed Due To Excavation |
| Depth Of Cover | 47 |
| Other Underground Facilities | No |
| Crossing | No |
| Pipe Facility Type | Intrastate |
| System Part Involved | Onshore Pipeline, Including Valve Sites |
| Item Involved | Pipe |
| Pipe Type | Pipe Body |
| Pipe Diameter | 16 |
| Puddle Weld Ind | No |
| Pipe Wall Thickness | 0.25 |
| Pipe Smys | 52000 |
| Pipe Specification | Api 5lx |
| Pipe Seam Type | Longitudinal Erw - High Frequency |
| Pipe Manufacturer | Stupp |
| Pipe Coating Type | Other |
| Pipe Coating Details | Hot Wax |
| Coating Applied Ind | Unknown |
| Installation Year | 1964 |
| Manufactured Year | 1964 |
| Material Involved | Carbon Steel |
| Release Type | Leak |
| Leak Type | Pinhole |
| Class Location Type | Class 3 Location |
| Could Be Hca | No |
| Pir Radius | 315 |
| Heat Damage Ind | No |
| Non Heat Damage Ind | No |
| Did Occur In Mca Ind | No |
| Est Cost Oper Paid | 0 |
| Est Cost Unintentional Release | 57 |
| Est Cost Intentional Release | 3248 |
| Est Cost Prop Damage | 208527 |
| Est Cost Emergency | 0 |
| Est Cost Other | 0 |
| Gas Cost In Mcf | 4.2 |
| Prpty | 211832 |
| 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 | 480 |
| Gas Flow In Pipe In Mcf | 9960 |
| Mop Psig | 812 |
| Mop Cfr Section | 192.619(A)(1) View CFR 49 §192 |
| Maop Established Date | 2017-12-31 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 | 15805 |
| 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 | Operator Employee |
| Investigation Status | Yes, specify investigation result(s): (select all that apply) |
| 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 | General Corrosion |
| Galvanic Corrosion Ind | Yes |
| Field Exam Basis Ind | Yes |
| Underground Location | Yes |
| Under Cathodic Protection Ind | Yes |
| Cathodic Pro Start Year | 1964 |
| Shielding Evident | Yes |
| Cathodic Survey Type | Yes |
| Cp Annual Survey Ind | Yes |
| Close Interval Survey Ind | Yes |
| Cp Annual Survey Year | 2024 |
| Close Interval Survey Year | 2024 |
| Prior Damage | Yes |
| Collected Data Ind | Yes |
| Axial Magnetic Flx Lkg Ind | Yes |
| Cir Trn Wave Mgn Flx Lkg Ind | Yes |
| Geometry Deformation Ind | Yes |
| Axial Recent Year | 2025 |
| Axial Rcnt Propul Method | Free Swimming |
| Axial Rcnt Attuned Detect | Metal Loss |
| Axial Rcnt Atnd Dtct Metal | High Resolution |
| Circ Wave Recent Year | 2025 |
| Circ Wv Rcnt Propul Method | Free Swimming |
| Circ Wv Rcnt Resolution | High Resolution |
| Geometry Recent Year | 2025 |
| Geometry Rcnt Propul Method | Free Swimming |
| Geometry Rcnt Resolution | High Resolution |
| Geometrt Rcnt Measur Cups | No Cups |
| Has Hydrtst Conduc Before Ind | No |
| Direct Asmnt Conducted | No |
| Non Destructive Exam Ind | No |
| Preparer Name | J***** C M***** |
| Preparer Title | Engineer |
| Preparer Email | J************@d********.com |
| Preparer Telephone | 2484621760 |
| Authorizer Name | J***** C M***** |
| Authorizer Title | Engineer |
| Authorizer Telephone | 2484621760 |
| Authorizer Email | J************@d********.com |
| Narrative | 5/14/25: while hand scraping for maintenance during prior defect identified during in-line-inspection, a leak developed on the alpena 16" transmission line. Pipeline is odorized 16" coated steel x52 0.250 wall thickness, installed in 1964, current maop 812 psig, normal operating 670 psig, pressure reduced to 480 psig prior to maintenance excavation. (original maop was 869 psig, derated in 2017 to 812 psig.) after leak developed, pipeline was blown down to zero pressure and cutout was made. On 5/22/25 repair was completed and pipeline was thereafter returned to service. On 6/11/25, contractor repair costs exceeded PHMSA reporting threshold and the incident was reported to PHMSA/nrc at 2:39pm on the same day (nrc # 1433791). |
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