Incident details
Operator, cause, commodity and consequences with raw source fields.
HL incident on 2020-09-09 — TX
Operator
Denbury Onshore, Llc
Cause
Equipment Failure
Commodity
Co2 (Carbon Dioxide)
Program
HL
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$2,236
Incident datetime
2020-09-09 21:50
Report number
Location
TX
Narrative
On 9/9/2020 at 19:19, the denbury control center (dcc) was notified by a private citizen of a white cloud near the lockhart junction valve location off cane market rd (in the area of the connection to the nejd pipeline). The dcc contacted the pipeline foreman who dispatched the appropriate denbury personnel to the site. Denbury personnel arrived onsite at 21:50 and made the determination that a carbon dioxide (CO2) leak was occurring near the junction of the lockhart lateral and nejd pipeline. It was initially unknown whether the leak was on the lockhart lateral or the nejd pipeline. The la state police hazardous material hotline was notified at 22:45 (state police report # 20-03507), followed by the notification to the livingston parish office of emergency preparedness at 23:01. The national response center (nrc) was then notified at 23:07 (nrc #1286945). At 22:21 the nejd pipeline pumps supplying pressure to the affected area were shut down. Because the area of the leak could not be accessed due to lack of visibility caused by the CO2 release, the interconnect valve could not be safely shut, in order to isolate the nejd pipeline from the lockhart lateral. Therefore the nejd mainline valves that isolate the nejd segment, containing the lockhart interconnect, were closed in order to ultimately limit the leak volume, in the event the leak was determined to be on the nejd pipeline. The nejd mainline valves were closed at 23:02 and 23:23. At 23:48 hours, emergency response contractors arrived on-site and began conducting preliminary air-monitoring for response personnel. In addition, air monitoring and atmospheric testing in and around the failure site was conducted and continued throughout the night. At 7:15 on 9/10/2020, site conditions significantly improved so that denbury personnel were able to safely access the lockhart junction valve location. At this time the location of the leak was identified to be on the lockhart lateral, so the tap valve and a downstream, above ground, isolation valve were immediately closed at the facility to isolate the leak. At 8:05 no product was observed coming from the leak location. It was determined that the leak occurred due to an isolation gasket failure at an above ground flanged joint on the lockhart lateral . On 9/11/2020 the failed isolation gasket was removed and replaced. Repairs were completed at 10:00 and the pipeline segment was returned to service. On 9/11/2020 at 16:42, the nrc was contacted to submit an update (nrc #1287129) to the original nrc report. The isolation gasket was sent to an independent lab for failure analysis. On january 21, 2021 denbury received the results of the analysis, which indicated that the gasket showed signs of damage (blistering, tears, cracks and spalling) that was concentrated at the bottom, on both the upstream and downstream sides. The report indicates that the failure initiated at the bottom and because of the additional signs of damage, suggests that the pipeline flange alignment may have changed over the period that the flange had been installed and may have led to the failure.
Detailed record list
Report Received Date
2020-10-08 00:00:00
Iyear
2020
Report Number
20200275
Supplemental Number
34887
Report Type
Supplemental Final
Operator Id
31627
Name
Denbury Onshore, Llc
Operator Street Address
5851 Legacy Circle, Suite 1200
Operator City Name
Plano
Operator State Abbreviation
TX
Operator Postal Code
75024
Local Datetime
2020-09-09 19:19:00
Location Latitude
30.53251
Location Longitude
-90.80213
Commodity Released Type
Co2 (Carbon Dioxide)
Unintentional Release Bbls
161
Intentional Release Bbls
361
Recovered Bbls
0
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Accident Identifier
Notification From Public
Incident Identified Datetime
2020-09-09 21:50:00
System Part Involved
Onshore Pipeline, Including Valve Sites
On Off Shore
Onshore
Shutdown Due Accident Ind
Yes
Shutdown Datetime
2020-09-09 22:21:00
Restart Datetime
2020-09-11 10:00:00
On Site Datetime
2020-09-09 21:50:00
Nrc Rpt Datetime
2020-09-09 23:07:00
Nrc Rpt Num
1286945
Ignite Ind
No
Explode Ind
No
Upstream Valve Type Ind
Manual
Downstream Valve Type Ind
Manual
Num Pub Evacuated
0
Pipe Fac Name
Lockhart Lateral
Segment Name
Lockhart Lateral
Onshore State Abbreviation
La
Onshore Postal Code
70754
Onshore City Name
Not Within A Municipality
Onshore County Name
Livingston
Designated Location
Milepost/valve Station
Designated Name
Lockhart Tap
Federal
No
Location Type
Originated On Operator-Controlled Property, But Then Flowed Or Migrated Off The Property
Incident Area Type
Aboveground
Incident Area Subtype
Typical Aboveground Facility Piping Or Appurtenance
Crossing
No
Pipe Facility Type
Interstate
Item Involved
Flange Assembly
Installation Year
2007
Material Involved
Material Other Than Carbon Steel
Material Details
Flange Insulation Gasket
Release Type
Leak
Leak Type
Other
Leak Type Other
Gasket
Wildlife Impact Ind
No
Soil Contamination
No
Long Term Assessment
No
Remediation Ind
No
Water Contam Ind
No
Could Be Hca
No
Commodity Reached Hca
No
Est Cost Oper Paid
0
Est Cost Gas Released
6126
Est Cost Prop Damage
2236
Est Cost Emergency
14000
Est Cost Environmental
0
Est Cost Other
0
Prpty
22362
Accident Psig
2005
Mop Psig
2207
Accident Pressure
Pressure Did Not Exceed Mop
Pressure Restriction Ind
No
Length Segment Isolated
50
Internal Inspection Ind
Yes
Operation Complications Ind
No
Pipeline Function
> 20% Smys Regulated Transmission
Scada In Place Ind
Yes
Scada Operating Ind
Yes
Scada Functional Ind
Yes
Scada Detection Ind
No
Scada Conf Ind
No
Cpm In Place Ind
No
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
The size of the leak was not large enough to be detected from the control room.
Employee Drug Test Ind
No
Contractor Drug Test Ind
No
Cause
Equipment Failure
Cause Details
Non-Threaded Connection Failure
Eq Failure Type
Non-Threaded Connection Failure
Other Non Threaded Ind
Gasket
Ief Addl Misalignment Ind
Yes
Preparer Name
C*** D******
Preparer Title
Regulatory Compliance Specialist
Preparer Email
C***********@d******.com
Preparer Telephone
9726732734
Prepared Date
2021-02-19 00:00:00
Authorizer Name
D**** S*******
Authorizer Telephone
9726732038
Authorizer Title
Senior Vice President - Operations
Authorizer Email
D*************@d******.com
Narrative
On 9/9/2020 at 19:19, the denbury control center (dcc) was notified by a private citizen of a white cloud near the lockhart junction valve location off cane market rd (in the area of the connection to the nejd pipeline). The dcc contacted the pipeline foreman who dispatched the appropriate denbury personnel to the site. Denbury personnel arrived onsite at 21:50 and made the determination that a carbon dioxide (CO2) leak was occurring near the junction of the lockhart lateral and nejd pipeline. It was initially unknown whether the leak was on the lockhart lateral or the nejd pipeline. The la state police hazardous material hotline was notified at 22:45 (state police report # 20-03507), followed by the notification to the livingston parish office of emergency preparedness at 23:01. The national response center (nrc) was then notified at 23:07 (nrc #1286945). At 22:21 the nejd pipeline pumps supplying pressure to the affected area were shut down. Because the area of the leak could not be accessed due to lack of visibility caused by the CO2 release, the interconnect valve could not be safely shut, in order to isolate the nejd pipeline from the lockhart lateral. Therefore the nejd mainline valves that isolate the nejd segment, containing the lockhart interconnect, were closed in order to ultimately limit the leak volume, in the event the leak was determined to be on the nejd pipeline. The nejd mainline valves were closed at 23:02 and 23:23. At 23:48 hours, emergency response contractors arrived on-site and began conducting preliminary air-monitoring for response personnel. In addition, air monitoring and atmospheric testing in and around the failure site was conducted and continued throughout the night. At 7:15 on 9/10/2020, site conditions significantly improved so that denbury personnel were able to safely access the lockhart junction valve location. At this time the location of the leak was identified to be on the lockhart lateral, so the tap valve and a downstream, above ground, isolation valve were immediately closed at the facility to isolate the leak. At 8:05 no product was observed coming from the leak location. It was determined that the leak occurred due to an isolation gasket failure at an above ground flanged joint on the lockhart lateral . On 9/11/2020 the failed isolation gasket was removed and replaced. Repairs were completed at 10:00 and the pipeline segment was returned to service. On 9/11/2020 at 16:42, the nrc was contacted to submit an update (nrc #1287129) to the original nrc report. The isolation gasket was sent to an independent lab for failure analysis. On january 21, 2021 denbury received the results of the analysis, which indicated that the gasket showed signs of damage (blistering, tears, cracks and spalling) that was concentrated at the bottom, on both the upstream and downstream sides. The report indicates that the failure initiated at the bottom and because of the additional signs of damage, suggests that the pipeline flange alignment may have changed over the period that the flange had been installed and may have led to the failure.
| Report Received Date | 2020-10-08 00:00:00 |
|---|---|
| Iyear | 2020 |
| Report Number | 20200275 |
| Supplemental Number | 34887 |
| Report Type | Supplemental Final |
| Operator Id | 31627 PHMSA Enforcement |
| Name | Denbury Onshore, Llc |
| Operator Street Address | 5851 Legacy Circle, Suite 1200 |
| Operator City Name | Plano |
| Operator State Abbreviation | TX |
| Operator Postal Code | 75024 |
| Local Datetime | 2020-09-09 19:19:00 |
| Location Latitude | 30.53251 Google Maps OpenStreetMap |
| Location Longitude | -90.80213 Google Maps OpenStreetMap |
| Commodity Released Type | Co2 (Carbon Dioxide) |
| Unintentional Release Bbls | 161 |
| Intentional Release Bbls | 361 |
| Recovered Bbls | 0 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Accident Identifier | Notification From Public |
| Incident Identified Datetime | 2020-09-09 21:50:00 |
| System Part Involved | Onshore Pipeline, Including Valve Sites |
| On Off Shore | Onshore |
| Shutdown Due Accident Ind | Yes |
| Shutdown Datetime | 2020-09-09 22:21:00 |
| Restart Datetime | 2020-09-11 10:00:00 |
| On Site Datetime | 2020-09-09 21:50:00 |
| Nrc Rpt Datetime | 2020-09-09 23:07:00 |
| Nrc Rpt Num | 1286945 NRC Report How to search |
| Ignite Ind | No |
| Explode Ind | No |
| Upstream Valve Type Ind | Manual |
| Downstream Valve Type Ind | Manual |
| Num Pub Evacuated | 0 |
| Pipe Fac Name | Lockhart Lateral |
| Segment Name | Lockhart Lateral |
| Onshore State Abbreviation | La |
| Onshore Postal Code | 70754 |
| Onshore City Name | Not Within A Municipality |
| Onshore County Name | Livingston |
| Designated Location | Milepost/valve Station |
| Designated Name | Lockhart Tap |
| Federal | No |
| Location Type | Originated On Operator-Controlled Property, But Then Flowed Or Migrated Off The Property |
| Incident Area Type | Aboveground |
| Incident Area Subtype | Typical Aboveground Facility Piping Or Appurtenance |
| Crossing | No |
| Pipe Facility Type | Interstate |
| Item Involved | Flange Assembly |
| Installation Year | 2007 |
| Material Involved | Material Other Than Carbon Steel |
| Material Details | Flange Insulation Gasket |
| Release Type | Leak |
| Leak Type | Other |
| Leak Type Other | Gasket |
| Wildlife Impact Ind | No |
| Soil Contamination | No |
| Long Term Assessment | No |
| Remediation Ind | No |
| Water Contam Ind | No |
| Could Be Hca | No |
| Commodity Reached Hca | No |
| Est Cost Oper Paid | 0 |
| Est Cost Gas Released | 6126 |
| Est Cost Prop Damage | 2236 |
| Est Cost Emergency | 14000 |
| Est Cost Environmental | 0 |
| Est Cost Other | 0 |
| Prpty | 22362 |
| Accident Psig | 2005 |
| Mop Psig | 2207 |
| Accident Pressure | Pressure Did Not Exceed Mop |
| Pressure Restriction Ind | No |
| Length Segment Isolated | 50 |
| Internal Inspection Ind | Yes |
| Operation Complications Ind | No |
| Pipeline Function | > 20% Smys Regulated Transmission |
| Scada In Place Ind | Yes |
| Scada Operating Ind | Yes |
| Scada Functional Ind | Yes |
| Scada Detection Ind | No |
| Scada Conf Ind | No |
| Cpm In Place Ind | No |
| 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 | The size of the leak was not large enough to be detected from the control room. |
| Employee Drug Test Ind | No |
| Contractor Drug Test Ind | No |
| Cause | Equipment Failure |
| Cause Details | Non-Threaded Connection Failure |
| Eq Failure Type | Non-Threaded Connection Failure |
| Other Non Threaded Ind | Gasket |
| Ief Addl Misalignment Ind | Yes |
| Preparer Name | C*** D****** |
| Preparer Title | Regulatory Compliance Specialist |
| Preparer Email | C***********@d******.com |
| Preparer Telephone | 9726732734 |
| Prepared Date | 2021-02-19 00:00:00 |
| Authorizer Name | D**** S******* |
| Authorizer Telephone | 9726732038 |
| Authorizer Title | Senior Vice President - Operations |
| Authorizer Email | D*************@d******.com |
| Narrative | On 9/9/2020 at 19:19, the denbury control center (dcc) was notified by a private citizen of a white cloud near the lockhart junction valve location off cane market rd (in the area of the connection to the nejd pipeline). The dcc contacted the pipeline foreman who dispatched the appropriate denbury personnel to the site. Denbury personnel arrived onsite at 21:50 and made the determination that a carbon dioxide (CO2) leak was occurring near the junction of the lockhart lateral and nejd pipeline. It was initially unknown whether the leak was on the lockhart lateral or the nejd pipeline. The la state police hazardous material hotline was notified at 22:45 (state police report # 20-03507), followed by the notification to the livingston parish office of emergency preparedness at 23:01. The national response center (nrc) was then notified at 23:07 (nrc #1286945). At 22:21 the nejd pipeline pumps supplying pressure to the affected area were shut down. Because the area of the leak could not be accessed due to lack of visibility caused by the CO2 release, the interconnect valve could not be safely shut, in order to isolate the nejd pipeline from the lockhart lateral. Therefore the nejd mainline valves that isolate the nejd segment, containing the lockhart interconnect, were closed in order to ultimately limit the leak volume, in the event the leak was determined to be on the nejd pipeline. The nejd mainline valves were closed at 23:02 and 23:23. At 23:48 hours, emergency response contractors arrived on-site and began conducting preliminary air-monitoring for response personnel. In addition, air monitoring and atmospheric testing in and around the failure site was conducted and continued throughout the night. At 7:15 on 9/10/2020, site conditions significantly improved so that denbury personnel were able to safely access the lockhart junction valve location. At this time the location of the leak was identified to be on the lockhart lateral, so the tap valve and a downstream, above ground, isolation valve were immediately closed at the facility to isolate the leak. At 8:05 no product was observed coming from the leak location. It was determined that the leak occurred due to an isolation gasket failure at an above ground flanged joint on the lockhart lateral . On 9/11/2020 the failed isolation gasket was removed and replaced. Repairs were completed at 10:00 and the pipeline segment was returned to service. On 9/11/2020 at 16:42, the nrc was contacted to submit an update (nrc #1287129) to the original nrc report. The isolation gasket was sent to an independent lab for failure analysis. On january 21, 2021 denbury received the results of the analysis, which indicated that the gasket showed signs of damage (blistering, tears, cracks and spalling) that was concentrated at the bottom, on both the upstream and downstream sides. The report indicates that the failure initiated at the bottom and because of the additional signs of damage, suggests that the pipeline flange alignment may have changed over the period that the flange had been installed and may have led to the failure. |
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