Incident details
Operator, cause, commodity and consequences with raw source fields.
GTG incident on 2021-02-19 — TX
Operator
Texas Gas Transmission, Llc
Cause
Equipment Failure
Commodity
Natural Gas
Program
GTG
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$400,000
Incident datetime
2021-02-19 22:40
Report number
Location
TX
Narrative
On 2/19/2021, texas gas' gas control received notification from a member of the general public reporting a loud noise at texas gas' block valve yard. Field operations personnel were dispatched and confirmed a leak on texas gas' asset. Appropriate notifications were made to authorities and customers. The system was isolated and pressure relieved while customer impact was evaluated. On 2/20/2021, the site was excavated and the cause, a cracked block valve (identified as block valve 2), was identified. Plans were made to address the incident and customers were updated. Pressure was maintained at approximately 145 psi from block valve 2 to bastrop to supply the customer until outage occurred. On 3/3/2021, the block valve was replaced and the segment was restored to service. 6/7/2021 final report submitted for the following: updated to correct lat/long and 48-hour follow-up nrc call number per PHMSA request. Updated property damage costs. Updated to include results of root cause analysis. After performing the analysis, the metallurgical lab concluded that the failure was likely due to fatigue that concentrated at the toe of a machined chamfer. This chamfer, measured at approximately 60�, resulted in a high stress concentrator, contributing to the fracture. 6/8/2021 supplemental/final report submitted to revise longitude as requested by PHMSA.
Detailed record list
Report Received Date
2021-03-15 00:00:00
Iyear
2021
Report Number
20210021
Supplemental Number
35379
Report Type
Supplemental Final
Operator Id
19270
Name
Texas Gas Transmission, Llc
Operator Street Address
9 Greenway Plaza Suite 2800
Operator City Name
Houston
Operator State Abbreviation
TX
Operator Postal Code
77046
Local Datetime
2021-02-19 22:40:00
Time Zone
Central
Daylight Savings Ind
No
Location Latitude
32.841227
Location Longitude
-91.950892
Nrc Rpt Num
1298469
Nrc Rpt Datetime
2021-02-19 23:45:00
Additional Nrc Report Numbers
1298607
Commodity Released Type
Natural Gas
Unintentional Release
209
Intentional Release
17614
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
2021-02-19 23:40:00
Restart Datetime
2021-03-05 17:45:00
Communication State Fed Ind
Yes
Party Initiated Communication
Operator
Initial Responder Com Datetime
2021-02-19 23:49:00
Ignite Ind
No
Upstream Action Taken
Valve Closure
Upstream Valve Close Datetime
2021-02-19 23:40:00
Downstream Action Taken
Valve Closure
Downstream Vlv Close Datetime
2021-02-19 23:40:00
Num Pub Evacuated
0
Incident Identified Datetime
2021-02-19 22:40:00
On Site Datetime
2021-02-19 22:40:00
On Off Shore
Onshore
Onshore State Abbreviation
La
Onshore Postal Code
71220
Onshore City Name
Not Within A Municipality
Onshore County Name
Morehouse
Designated Location
Milepost
Designated Name
10+1474
Pipe Fac Name
Bastrop-Eunice 26" Line
Segment Name
Bae 26-1
Federal
No
Location Type
Operator-Controlled Property
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
Valve
Valve Type
Mainline
Valve Mainline Type
Gate
Valve Manufacturer
Wkm, Inc.
Installation Year
1951
Manufactured Year
Unknown
Material Involved
Carbon Steel
Release Type
Leak
Leak Type
Crack
Class Location Type
Class 1 Location
Could Be Hca
No
Pir Radius
551
Heat Damage Ind
No
Non Heat Damage Ind
No
Est Cost Oper Paid
0
Est Cost Unintentional Release
577
Est Cost Intentional Release
48615
Est Cost Prop Damage
400000
Est Cost Emergency
1000
Est Cost Other
0
Gas Cost In Mcf
2.76
Prpty
450192
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
600
Gas Flow In Pipe In Mcf
450000
Mop Psig
810
Mop Cfr Section
Other
Mop Cfr Section Details
192.611(A)(1)(I)
Maop Established Date
2021-01-28 00:00:00
Maop Reversal Flow Ind
Yes
Accident Pressure
Pressure Did Not Exceed Maop
Pressure Restriction Ind
No
Gas Required Odorized Ind
No
Upstream Valve Type Ind
Automatic
Downstream Valve Type Ind
Manual
Length Segment Isolated
116160
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
Notification From Public
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
Equipment Failure
Cause Details
Failure Of Equipment Body (Except Compressor), Vessel Plate, Or Other Material
Eq Failure Type
Failure Of Equipment Body (Except Compressor), Vessel Plate, Or Other Material
Eq Additional Other Ind
Yes
Eq Additional Other Details
Fatigue
Preparer Name
S****** M********
Preparer Title
Pa Oq And Event Program Leader
Preparer Email
S****************@b**********.com
Preparer Telephone
2709035764
Authorizer Name
T*** B****
Authorizer Title
Manager Compliance Services
Authorizer Telephone
2703146547
Authorizer Email
T*********@b**********.com
Narrative
On 2/19/2021, texas gas' gas control received notification from a member of the general public reporting a loud noise at texas gas' block valve yard. Field operations personnel were dispatched and confirmed a leak on texas gas' asset. Appropriate notifications were made to authorities and customers. The system was isolated and pressure relieved while customer impact was evaluated. On 2/20/2021, the site was excavated and the cause, a cracked block valve (identified as block valve 2), was identified. Plans were made to address the incident and customers were updated. Pressure was maintained at approximately 145 psi from block valve 2 to bastrop to supply the customer until outage occurred. On 3/3/2021, the block valve was replaced and the segment was restored to service. 6/7/2021 final report submitted for the following: updated to correct lat/long and 48-hour follow-up nrc call number per PHMSA request. Updated property damage costs. Updated to include results of root cause analysis. After performing the analysis, the metallurgical lab concluded that the failure was likely due to fatigue that concentrated at the toe of a machined chamfer. This chamfer, measured at approximately 60�, resulted in a high stress concentrator, contributing to the fracture. 6/8/2021 supplemental/final report submitted to revise longitude as requested by PHMSA.
| Report Received Date | 2021-03-15 00:00:00 |
|---|---|
| Iyear | 2021 |
| Report Number | 20210021 |
| Supplemental Number | 35379 |
| Report Type | Supplemental Final |
| Operator Id | 19270 PHMSA Enforcement |
| Name | Texas Gas Transmission, Llc |
| Operator Street Address | 9 Greenway Plaza Suite 2800 |
| Operator City Name | Houston |
| Operator State Abbreviation | TX |
| Operator Postal Code | 77046 |
| Local Datetime | 2021-02-19 22:40:00 |
| Time Zone | Central |
| Daylight Savings Ind | No |
| Location Latitude | 32.841227 Google Maps OpenStreetMap |
| Location Longitude | -91.950892 Google Maps OpenStreetMap |
| Nrc Rpt Num | 1298469 NRC Report How to search |
| Nrc Rpt Datetime | 2021-02-19 23:45:00 |
| Additional Nrc Report Numbers | 1298607 |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 209 |
| Intentional Release | 17614 |
| 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 | 2021-02-19 23:40:00 |
| Restart Datetime | 2021-03-05 17:45:00 |
| Communication State Fed Ind | Yes |
| Party Initiated Communication | Operator |
| Initial Responder Com Datetime | 2021-02-19 23:49:00 |
| Ignite Ind | No |
| Upstream Action Taken | Valve Closure |
| Upstream Valve Close Datetime | 2021-02-19 23:40:00 |
| Downstream Action Taken | Valve Closure |
| Downstream Vlv Close Datetime | 2021-02-19 23:40:00 |
| Num Pub Evacuated | 0 |
| Incident Identified Datetime | 2021-02-19 22:40:00 |
| On Site Datetime | 2021-02-19 22:40:00 |
| On Off Shore | Onshore |
| Onshore State Abbreviation | La |
| Onshore Postal Code | 71220 |
| Onshore City Name | Not Within A Municipality |
| Onshore County Name | Morehouse |
| Designated Location | Milepost |
| Designated Name | 10+1474 |
| Pipe Fac Name | Bastrop-Eunice 26" Line |
| Segment Name | Bae 26-1 |
| Federal | No |
| Location Type | Operator-Controlled Property |
| 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 | Valve |
| Valve Type | Mainline |
| Valve Mainline Type | Gate |
| Valve Manufacturer | Wkm, Inc. |
| Installation Year | 1951 |
| Manufactured Year | Unknown |
| Material Involved | Carbon Steel |
| Release Type | Leak |
| Leak Type | Crack |
| Class Location Type | Class 1 Location |
| Could Be Hca | No |
| Pir Radius | 551 |
| Heat Damage Ind | No |
| Non Heat Damage Ind | No |
| Est Cost Oper Paid | 0 |
| Est Cost Unintentional Release | 577 |
| Est Cost Intentional Release | 48615 |
| Est Cost Prop Damage | 400000 |
| Est Cost Emergency | 1000 |
| Est Cost Other | 0 |
| Gas Cost In Mcf | 2.76 |
| Prpty | 450192 |
| 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 | 600 |
| Gas Flow In Pipe In Mcf | 450000 |
| Mop Psig | 810 |
| Mop Cfr Section | Other View CFR 49 §192 |
| Mop Cfr Section Details | 192.611(A)(1)(I) |
| Maop Established Date | 2021-01-28 00:00:00 |
| Maop Reversal Flow Ind | Yes |
| Accident Pressure | Pressure Did Not Exceed Maop |
| Pressure Restriction Ind | No |
| Gas Required Odorized Ind | No |
| Upstream Valve Type Ind | Automatic |
| Downstream Valve Type Ind | Manual |
| Length Segment Isolated | 116160 |
| 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 | Notification From Public |
| 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 | Equipment Failure |
| Cause Details | Failure Of Equipment Body (Except Compressor), Vessel Plate, Or Other Material |
| Eq Failure Type | Failure Of Equipment Body (Except Compressor), Vessel Plate, Or Other Material |
| Eq Additional Other Ind | Yes |
| Eq Additional Other Details | Fatigue |
| Preparer Name | S****** M******** |
| Preparer Title | Pa Oq And Event Program Leader |
| Preparer Email | S****************@b**********.com |
| Preparer Telephone | 2709035764 |
| Authorizer Name | T*** B**** |
| Authorizer Title | Manager Compliance Services |
| Authorizer Telephone | 2703146547 |
| Authorizer Email | T*********@b**********.com |
| Narrative | On 2/19/2021, texas gas' gas control received notification from a member of the general public reporting a loud noise at texas gas' block valve yard. Field operations personnel were dispatched and confirmed a leak on texas gas' asset. Appropriate notifications were made to authorities and customers. The system was isolated and pressure relieved while customer impact was evaluated. On 2/20/2021, the site was excavated and the cause, a cracked block valve (identified as block valve 2), was identified. Plans were made to address the incident and customers were updated. Pressure was maintained at approximately 145 psi from block valve 2 to bastrop to supply the customer until outage occurred. On 3/3/2021, the block valve was replaced and the segment was restored to service. 6/7/2021 final report submitted for the following: updated to correct lat/long and 48-hour follow-up nrc call number per PHMSA request. Updated property damage costs. Updated to include results of root cause analysis. After performing the analysis, the metallurgical lab concluded that the failure was likely due to fatigue that concentrated at the toe of a machined chamfer. This chamfer, measured at approximately 60�, resulted in a high stress concentrator, contributing to the fracture. 6/8/2021 supplemental/final report submitted to revise longitude as requested by PHMSA. |
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