Incident details
Operator, cause, commodity and consequences with raw source fields.
GTG incident on 2021-11-05 — IN
Operator
Citizens Gas & Coke Utility
Cause
Material Failure Of Pipe Or Weld
Commodity
Natural Gas
Program
GTG
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$0
Incident datetime
2021-11-05 01:30
Report number
Location
IN
Narrative
A crack occurred on a 20" natural gas transmission pipeline. There were no injuries, no ignition and no property damage as a result of this failure. Approximately 560 mcf of natural gas was released to atmosphere, this includes intentional and unintentional. The approximate 10" linear crack is in the proximity of 3:00 on the 20" ceg transmission pipeline and was within 1" of a4" welded tie in. (not sure on the nature of the crack, the lab analysis will help determine root cause.) the section of pipe, including the 4" tie in, was removed and sent for a laboratory analysis. Lab results indicated the following: "the 20" gas main failure was caused by a sudden overload condition. This introduced a through wall crack in the lengthwise direction at the 12 o'clock location adjacent to the weld joint between the main line and the lateral line. The crack initiated on the od surface and propagated under a fast and sudden overload condition, as indicated by the brittle cleavage fracture morphology. This is consistent with the scenario if the 4" lateral line is improperly supported by the backfill. The pipeline has a successful service history since 1969. The failure occurred after a length of 10' of the 4" lateral pipe was exposed and subjected to soil removal and replacement. The crack initiation point would have experienced the highest bending moment to initiate the crack. Overall condition of the gas main is acceptable without any significant anomalies. Corrosion or any other anomalies were noted which could have contributed to this failure. The gas main is identified to be a carbon steel (aisi 1025) with a ferrite/pearlite microstructure; typical for gas mains. The pipe also meets the required specification astm a53 grade b. The hardness of the pipe is measured at ~80 rockwell b which is again typical for these pipes and is in agreement with the microstructure. Tensile and charpy testing is being performed and will be submitted in the material analysis report. We do not expect any unusual tensile and charpy testing results as the hardness and microstructure is typical of this alloy.
Detailed record list
Report Received Date
2021-12-03 00:00:00
Iyear
2021
Report Number
20210111
Supplemental Number
38483
Report Type
Supplemental Final
Operator Id
2392
Name
Citizens Gas & Coke Utility
Operator Street Address
2020 N Meridian St
Operator City Name
Indianapolis
Operator State Abbreviation
IN
Operator Postal Code
469202
Local Datetime
2021-11-05 02:37:00
Time Zone
Eastern
Daylight Savings Ind
Yes
Location Latitude
39.7789451
Location Longitude
-86.2507531
Nrc Rpt Num
1321225
Nrc Rpt Datetime
2021-11-05 02:37:00
Additional Nrc Report Numbers
1321259
Commodity Released Type
Natural Gas
Unintentional Release
559.97
Intentional Release
76.75
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
Shutdown Datetime
2021-11-05 02:44:00
Restart Datetime
2021-11-12 16:30:00
Ignite Ind
No
Upstream Action Taken
Valve Closure
Upstream Valve Close Datetime
2021-11-05 02:44:00
Downstream Action Taken
Valve Closure
Downstream Vlv Close Datetime
2021-11-05 02:44:00
Num Pub Evacuated
0
Incident Identified Datetime
2021-11-05 01:30:00
On Site Datetime
2021-11-05 01:30:00
On Off Shore
Onshore
Onshore State Abbreviation
In
Onshore Postal Code
46224
Onshore City Name
Indianapolis
Onshore County Name
Marion
Designated Location
Not Applicable
Pipe Fac Name
West Leg
Segment Name
Gmn116405
Federal
No
Location Type
Pipeline Right-Of-Way
Incident Area Type
Underground
Incident Area Subtype
Under Soil
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
20
Puddle Weld Ind
No
Pipe Wall Thickness
0.312
Pipe Smys
35000
Pipe Specification
Api 5l
Pipe Seam Type
Seamless
Pipe Manufacturer
Unknown
Pipe Coating Type
Coal Tar
Coating Applied Ind
No
Installation Year
1960
Manufactured Year
Unknown
Material Involved
Carbon Steel
Release Type
Leak
Leak Type
Crack
Class Location Type
Class 3 Location
Could Be Hca
Yes
Determination Method
Method1
Pir Radius
267
Heat Damage Ind
No
Non Heat Damage Ind
No
Est Cost Oper Paid
0
Est Cost Unintentional Release
3013
Est Cost Intentional Release
413
Est Cost Prop Damage
0
Est Cost Emergency
0
Est Cost Other
0
Est Cost Other Details
There Was No Property Damage.
Gas Cost In Mcf
5.38
Prpty
3426
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
320
Gas Flow In Pipe In Mcf
1200
Mop Psig
375
Mop Cfr Section
192.619(A)(3)
Maop Established Date
1970-07-01 00:00:00
Maop Reversal Flow Ind
No
Accident Pressure
Pressure Did Not Exceed Maop
Pressure Restriction Ind
No
Gas Required Odorized Ind
Yes
Gas Odorized Ind
Yes
Upstream Valve Type Ind
Manual
Downstream Valve Type Ind
Manual
Length Segment Isolated
41597
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
No
Scada Conf Ind
No
Accident Identifier
Notification From Emergency Responder
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
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
Additional Crack Ind
Yes
Post Constr Pressure Test Val
Unknown
Collected Data Ind
No
Has Hydrtst Conduc Before Ind
No
Direct Asmnt Conducted
Yes, But The Point Of The Accident Was Not Identified As A Dig Site
Direct Asmnt Pnt Not Idntf Yr
2021
Asmnt Ecda Rcnt Year
2021
Asmnt Ecda Rcnt Ind
Yes
Non Destructive Exam Ind
No
Preparer Name
B******* S* W*****
Preparer Title
Director Gas Transmission And Distribution
Preparer Email
B******@c******************.com
Preparer Telephone
3179274622
Authorizer Name
B******* S* W*****
Authorizer Title
Director Gas Transmission And Distribution
Authorizer Telephone
3179274622
Authorizer Email
B******@c******************.com
Narrative
A crack occurred on a 20" natural gas transmission pipeline. There were no injuries, no ignition and no property damage as a result of this failure. Approximately 560 mcf of natural gas was released to atmosphere, this includes intentional and unintentional. The approximate 10" linear crack is in the proximity of 3:00 on the 20" ceg transmission pipeline and was within 1" of a4" welded tie in. (not sure on the nature of the crack, the lab analysis will help determine root cause.) the section of pipe, including the 4" tie in, was removed and sent for a laboratory analysis. Lab results indicated the following: "the 20" gas main failure was caused by a sudden overload condition. This introduced a through wall crack in the lengthwise direction at the 12 o'clock location adjacent to the weld joint between the main line and the lateral line. The crack initiated on the od surface and propagated under a fast and sudden overload condition, as indicated by the brittle cleavage fracture morphology. This is consistent with the scenario if the 4" lateral line is improperly supported by the backfill. The pipeline has a successful service history since 1969. The failure occurred after a length of 10' of the 4" lateral pipe was exposed and subjected to soil removal and replacement. The crack initiation point would have experienced the highest bending moment to initiate the crack. Overall condition of the gas main is acceptable without any significant anomalies. Corrosion or any other anomalies were noted which could have contributed to this failure. The gas main is identified to be a carbon steel (aisi 1025) with a ferrite/pearlite microstructure; typical for gas mains. The pipe also meets the required specification astm a53 grade b. The hardness of the pipe is measured at ~80 rockwell b which is again typical for these pipes and is in agreement with the microstructure. Tensile and charpy testing is being performed and will be submitted in the material analysis report. We do not expect any unusual tensile and charpy testing results as the hardness and microstructure is typical of this alloy.
| Report Received Date | 2021-12-03 00:00:00 |
|---|---|
| Iyear | 2021 |
| Report Number | 20210111 |
| Supplemental Number | 38483 |
| Report Type | Supplemental Final |
| Operator Id | 2392 PHMSA Enforcement |
| Name | Citizens Gas & Coke Utility |
| Operator Street Address | 2020 N Meridian St |
| Operator City Name | Indianapolis |
| Operator State Abbreviation | IN |
| Operator Postal Code | 469202 |
| Local Datetime | 2021-11-05 02:37:00 |
| Time Zone | Eastern |
| Daylight Savings Ind | Yes |
| Location Latitude | 39.7789451 Google Maps OpenStreetMap |
| Location Longitude | -86.2507531 Google Maps OpenStreetMap |
| Nrc Rpt Num | 1321225 NRC Report How to search |
| Nrc Rpt Datetime | 2021-11-05 02:37:00 |
| Additional Nrc Report Numbers | 1321259 |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 559.97 |
| Intentional Release | 76.75 |
| 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 |
| Shutdown Datetime | 2021-11-05 02:44:00 |
| Restart Datetime | 2021-11-12 16:30:00 |
| Ignite Ind | No |
| Upstream Action Taken | Valve Closure |
| Upstream Valve Close Datetime | 2021-11-05 02:44:00 |
| Downstream Action Taken | Valve Closure |
| Downstream Vlv Close Datetime | 2021-11-05 02:44:00 |
| Num Pub Evacuated | 0 |
| Incident Identified Datetime | 2021-11-05 01:30:00 |
| On Site Datetime | 2021-11-05 01:30:00 |
| On Off Shore | Onshore |
| Onshore State Abbreviation | In |
| Onshore Postal Code | 46224 |
| Onshore City Name | Indianapolis |
| Onshore County Name | Marion |
| Designated Location | Not Applicable |
| Pipe Fac Name | West Leg |
| Segment Name | Gmn116405 |
| Federal | No |
| Location Type | Pipeline Right-Of-Way |
| Incident Area Type | Underground |
| Incident Area Subtype | Under Soil |
| 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 | 20 |
| Puddle Weld Ind | No |
| Pipe Wall Thickness | 0.312 |
| Pipe Smys | 35000 |
| Pipe Specification | Api 5l |
| Pipe Seam Type | Seamless |
| Pipe Manufacturer | Unknown |
| Pipe Coating Type | Coal Tar |
| Coating Applied Ind | No |
| Installation Year | 1960 |
| Manufactured Year | Unknown |
| Material Involved | Carbon Steel |
| Release Type | Leak |
| Leak Type | Crack |
| Class Location Type | Class 3 Location |
| Could Be Hca | Yes |
| Determination Method | Method1 |
| Pir Radius | 267 |
| Heat Damage Ind | No |
| Non Heat Damage Ind | No |
| Est Cost Oper Paid | 0 |
| Est Cost Unintentional Release | 3013 |
| Est Cost Intentional Release | 413 |
| Est Cost Prop Damage | 0 |
| Est Cost Emergency | 0 |
| Est Cost Other | 0 |
| Est Cost Other Details | There Was No Property Damage. |
| Gas Cost In Mcf | 5.38 |
| Prpty | 3426 |
| 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 | 320 |
| Gas Flow In Pipe In Mcf | 1200 |
| Mop Psig | 375 |
| Mop Cfr Section | 192.619(A)(3) View CFR 49 §192 |
| Maop Established Date | 1970-07-01 00:00:00 |
| Maop Reversal Flow Ind | No |
| Accident Pressure | Pressure Did Not Exceed Maop |
| Pressure Restriction Ind | No |
| Gas Required Odorized Ind | Yes |
| Gas Odorized Ind | Yes |
| Upstream Valve Type Ind | Manual |
| Downstream Valve Type Ind | Manual |
| Length Segment Isolated | 41597 |
| 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 | No |
| Scada Conf Ind | No |
| Accident Identifier | Notification From Emergency Responder |
| 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 | 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 |
| Additional Crack Ind | Yes |
| Post Constr Pressure Test Val | Unknown |
| Collected Data Ind | No |
| Has Hydrtst Conduc Before Ind | No |
| Direct Asmnt Conducted | Yes, But The Point Of The Accident Was Not Identified As A Dig Site |
| Direct Asmnt Pnt Not Idntf Yr | 2021 |
| Asmnt Ecda Rcnt Year | 2021 |
| Asmnt Ecda Rcnt Ind | Yes |
| Non Destructive Exam Ind | No |
| Preparer Name | B******* S* W***** |
| Preparer Title | Director Gas Transmission And Distribution |
| Preparer Email | B******@c******************.com |
| Preparer Telephone | 3179274622 |
| Authorizer Name | B******* S* W***** |
| Authorizer Title | Director Gas Transmission And Distribution |
| Authorizer Telephone | 3179274622 |
| Authorizer Email | B******@c******************.com |
| Narrative | A crack occurred on a 20" natural gas transmission pipeline. There were no injuries, no ignition and no property damage as a result of this failure. Approximately 560 mcf of natural gas was released to atmosphere, this includes intentional and unintentional. The approximate 10" linear crack is in the proximity of 3:00 on the 20" ceg transmission pipeline and was within 1" of a4" welded tie in. (not sure on the nature of the crack, the lab analysis will help determine root cause.) the section of pipe, including the 4" tie in, was removed and sent for a laboratory analysis. Lab results indicated the following: "the 20" gas main failure was caused by a sudden overload condition. This introduced a through wall crack in the lengthwise direction at the 12 o'clock location adjacent to the weld joint between the main line and the lateral line. The crack initiated on the od surface and propagated under a fast and sudden overload condition, as indicated by the brittle cleavage fracture morphology. This is consistent with the scenario if the 4" lateral line is improperly supported by the backfill. The pipeline has a successful service history since 1969. The failure occurred after a length of 10' of the 4" lateral pipe was exposed and subjected to soil removal and replacement. The crack initiation point would have experienced the highest bending moment to initiate the crack. Overall condition of the gas main is acceptable without any significant anomalies. Corrosion or any other anomalies were noted which could have contributed to this failure. The gas main is identified to be a carbon steel (aisi 1025) with a ferrite/pearlite microstructure; typical for gas mains. The pipe also meets the required specification astm a53 grade b. The hardness of the pipe is measured at ~80 rockwell b which is again typical for these pipes and is in agreement with the microstructure. Tensile and charpy testing is being performed and will be submitted in the material analysis report. We do not expect any unusual tensile and charpy testing results as the hardness and microstructure is typical of this alloy. |
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