Incident details
Operator, cause, commodity and consequences with raw source fields.
HL incident on 2020-10-07 — TX
Operator
Denbury Gulf Coast Pipelines, Llc
Cause
Equipment Failure
Commodity
Co2 (Carbon Dioxide)
Program
HL
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$0
Incident datetime
2020-10-07 20:26
Report number
Location
TX
Narrative
On 10/7/2020 at 17:31, denbury began blowdown activities to perform work required to reconnect a downstream pipeline segment to an upstream section of pipe on the delhi pipeline system at the satartia mlv several miles southwest of satartia, mississippi and adjacent to state highway 3. The section was originally removed and temporarily capped, in order to positively isolate the delta pipeline incident location (february 2020) from the downstream, pressurized segment of pipe. Because the satartia mlv did not seal properly, there was more product in the segment, between the satartia mlv and the temporary weld cap, than anticipated. Once it was determined that the mlv was not sealing, the denbury operator began to close the blow-down valve, in order to shut-down the operation for the evening. As the operator attempted to close the valve, after several attempts, he found that the handwheel on the gear operator would not turn. Because of the joule-thomson effect, associated with the mlv product blow-by, it is believed that the open 8' blowdown valve (that was in the flow path of the leaking mlv) froze in the open position due to internal ice formation. Due to the potential of public impact, the yazoo county ema was notified at 20:26 and msdeq emergency services was notified at 20:34. The national response center (nrc) was then notified at 21:21 (nrc #1289255). Due to the proximity of the release to highway 3, the highway was shut down to avoid the possibility of a vehicle accident due to low visibility caused by the CO2 cloud. As an additional precaution, emergency response contractors were dispatched to conduct air-monitoring in the surrounding area, to ensure the safety of the response personnel and local public. Atmospheric testing in and around the release site was continuously conducted throughout the night. All areas being monitored maintained adequate oxygen levels throughout the duration of the release. On 10/8/2020 at 18:00, once the pipeline segment pressure had been reduced enough to prevent additional CO2 blowby through the mlv, the blowdown valve thawed enough to allow it to be closed. Once the blowdown valve was closed, the product release was stopped, and highway 3 was re-opened. On 10/9/2020 at 15:43, the nrc was contacted to submit an update (nrc #1289386) to the original nrc report. On 10/12/2020, all valves at the satartia mlv location were flushed and lubricated and determined to be in working order. Once the temporary weld caps were removed and replaced with tested pipe, the pipeline was restarted on 10/26/2020 at 12:30 with no issues.
Detailed record list
Report Received Date
2020-11-06 00:00:00
Iyear
2020
Report Number
20200300
Supplemental Number
34501
Report Type
Original Final
Operator Id
32545
Name
Denbury Gulf Coast Pipelines, Llc
Operator Street Address
5851 Legacy Circle Suite 1200
Operator City Name
Plano
Operator State Abbreviation
TX
Operator Postal Code
75024
Local Datetime
2020-10-07 20:26:00
Location Latitude
32.628233
Location Longitude
-90.569264
Commodity Released Type
Co2 (Carbon Dioxide)
Unintentional Release Bbls
41177
Intentional Release Bbls
0
Recovered Bbls
0
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Accident Identifier
Local Operating Personnel, Including Contractors
Operator Type
Operator Employee
Incident Identified Datetime
2020-10-07 20:26:00
System Part Involved
Onshore Pipeline, Including Valve Sites
On Off Shore
Onshore
Shutdown Due Accident Ind
No
Shutdown Explain
At The Time Of The Release The Segment Was Shutdown Due To Repair In Progress
On Site Datetime
2020-10-07 20:26:00
Nrc Rpt Datetime
2020-10-07 21:21:00
Nrc Rpt Num
1289255
Ignite Ind
No
Explode Ind
No
Upstream Valve Type Ind
Manual
Downstream Valve Type Ind
Manual
Num Pub Evacuated
0
Pipe Fac Name
Delhi
Segment Name
Delhi
Onshore State Abbreviation
Ms
Onshore Postal Code
39162
Onshore City Name
Not Within A Municipality
Onshore County Name
Yazoo County
Designated Location
Milepost/valve Station
Designated Name
Satartia Mlv
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
Valve
Valve Type
Auxiliary Or Other Valve
Installation Year
2009
Material Involved
Carbon Steel
Release Type
Other
Release Type Details
Frozen Valve/ice Accumulation
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
28718
Est Cost Prop Damage
0
Est Cost Emergency
36280
Est Cost Environmental
0
Est Cost Other
0
Prpty
64998
Accident Psig
980
Mop Psig
2160
Accident Pressure
Pressure Did Not Exceed Mop
Pressure Restriction Ind
No
Length Segment Isolated
81840
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 nature of the release
Employee Drug Test Ind
Yes
Contractor Drug Test Ind
No
Num Employees Tested
1
Num Employees Failed
0
Cause
Equipment Failure
Cause Details
Malfunction Of Control/relief Equipment
Eq Failure Type
Malfunction Of Control/relief Equipment
Block Valve Ind
Yes
Eq Additional Other Ind
Yes
Eq Additional Other Details
Ice Accumulation Within The Valve Which Affected The Ability To Shut The Valve
Preparer Name
C*** D******
Preparer Title
Regulatory Compliance Specialist
Preparer Email
C***********@d******.com
Preparer Telephone
9726732734
Prepared Date
2020-11-06 00:00:00
Authorizer Name
D**** S*******
Authorizer Telephone
9726732038
Authorizer Title
Senior Vice President - Operations
Authorizer Email
D*************@d******.com
Narrative
On 10/7/2020 at 17:31, denbury began blowdown activities to perform work required to reconnect a downstream pipeline segment to an upstream section of pipe on the delhi pipeline system at the satartia mlv several miles southwest of satartia, mississippi and adjacent to state highway 3. The section was originally removed and temporarily capped, in order to positively isolate the delta pipeline incident location (february 2020) from the downstream, pressurized segment of pipe. Because the satartia mlv did not seal properly, there was more product in the segment, between the satartia mlv and the temporary weld cap, than anticipated. Once it was determined that the mlv was not sealing, the denbury operator began to close the blow-down valve, in order to shut-down the operation for the evening. As the operator attempted to close the valve, after several attempts, he found that the handwheel on the gear operator would not turn. Because of the joule-thomson effect, associated with the mlv product blow-by, it is believed that the open 8' blowdown valve (that was in the flow path of the leaking mlv) froze in the open position due to internal ice formation. Due to the potential of public impact, the yazoo county ema was notified at 20:26 and msdeq emergency services was notified at 20:34. The national response center (nrc) was then notified at 21:21 (nrc #1289255). Due to the proximity of the release to highway 3, the highway was shut down to avoid the possibility of a vehicle accident due to low visibility caused by the CO2 cloud. As an additional precaution, emergency response contractors were dispatched to conduct air-monitoring in the surrounding area, to ensure the safety of the response personnel and local public. Atmospheric testing in and around the release site was continuously conducted throughout the night. All areas being monitored maintained adequate oxygen levels throughout the duration of the release. On 10/8/2020 at 18:00, once the pipeline segment pressure had been reduced enough to prevent additional CO2 blowby through the mlv, the blowdown valve thawed enough to allow it to be closed. Once the blowdown valve was closed, the product release was stopped, and highway 3 was re-opened. On 10/9/2020 at 15:43, the nrc was contacted to submit an update (nrc #1289386) to the original nrc report. On 10/12/2020, all valves at the satartia mlv location were flushed and lubricated and determined to be in working order. Once the temporary weld caps were removed and replaced with tested pipe, the pipeline was restarted on 10/26/2020 at 12:30 with no issues.
| Report Received Date | 2020-11-06 00:00:00 |
|---|---|
| Iyear | 2020 |
| Report Number | 20200300 |
| Supplemental Number | 34501 |
| Report Type | Original Final |
| Operator Id | 32545 PHMSA Enforcement |
| Name | Denbury Gulf Coast Pipelines, Llc |
| Operator Street Address | 5851 Legacy Circle Suite 1200 |
| Operator City Name | Plano |
| Operator State Abbreviation | TX |
| Operator Postal Code | 75024 |
| Local Datetime | 2020-10-07 20:26:00 |
| Location Latitude | 32.628233 Google Maps OpenStreetMap |
| Location Longitude | -90.569264 Google Maps OpenStreetMap |
| Commodity Released Type | Co2 (Carbon Dioxide) |
| Unintentional Release Bbls | 41177 |
| Intentional Release Bbls | 0 |
| Recovered Bbls | 0 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Accident Identifier | Local Operating Personnel, Including Contractors |
| Operator Type | Operator Employee |
| Incident Identified Datetime | 2020-10-07 20:26:00 |
| System Part Involved | Onshore Pipeline, Including Valve Sites |
| On Off Shore | Onshore |
| Shutdown Due Accident Ind | No |
| Shutdown Explain | At The Time Of The Release The Segment Was Shutdown Due To Repair In Progress |
| On Site Datetime | 2020-10-07 20:26:00 |
| Nrc Rpt Datetime | 2020-10-07 21:21:00 |
| Nrc Rpt Num | 1289255 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 | Delhi |
| Segment Name | Delhi |
| Onshore State Abbreviation | Ms |
| Onshore Postal Code | 39162 |
| Onshore City Name | Not Within A Municipality |
| Onshore County Name | Yazoo County |
| Designated Location | Milepost/valve Station |
| Designated Name | Satartia Mlv |
| 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 | Valve |
| Valve Type | Auxiliary Or Other Valve |
| Installation Year | 2009 |
| Material Involved | Carbon Steel |
| Release Type | Other |
| Release Type Details | Frozen Valve/ice Accumulation |
| 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 | 28718 |
| Est Cost Prop Damage | 0 |
| Est Cost Emergency | 36280 |
| Est Cost Environmental | 0 |
| Est Cost Other | 0 |
| Prpty | 64998 |
| Accident Psig | 980 |
| Mop Psig | 2160 |
| Accident Pressure | Pressure Did Not Exceed Mop |
| Pressure Restriction Ind | No |
| Length Segment Isolated | 81840 |
| 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 nature of the release |
| Employee Drug Test Ind | Yes |
| Contractor Drug Test Ind | No |
| Num Employees Tested | 1 |
| Num Employees Failed | 0 |
| Cause | Equipment Failure |
| Cause Details | Malfunction Of Control/relief Equipment |
| Eq Failure Type | Malfunction Of Control/relief Equipment |
| Block Valve Ind | Yes |
| Eq Additional Other Ind | Yes |
| Eq Additional Other Details | Ice Accumulation Within The Valve Which Affected The Ability To Shut The Valve |
| Preparer Name | C*** D****** |
| Preparer Title | Regulatory Compliance Specialist |
| Preparer Email | C***********@d******.com |
| Preparer Telephone | 9726732734 |
| Prepared Date | 2020-11-06 00:00:00 |
| Authorizer Name | D**** S******* |
| Authorizer Telephone | 9726732038 |
| Authorizer Title | Senior Vice President - Operations |
| Authorizer Email | D*************@d******.com |
| Narrative | On 10/7/2020 at 17:31, denbury began blowdown activities to perform work required to reconnect a downstream pipeline segment to an upstream section of pipe on the delhi pipeline system at the satartia mlv several miles southwest of satartia, mississippi and adjacent to state highway 3. The section was originally removed and temporarily capped, in order to positively isolate the delta pipeline incident location (february 2020) from the downstream, pressurized segment of pipe. Because the satartia mlv did not seal properly, there was more product in the segment, between the satartia mlv and the temporary weld cap, than anticipated. Once it was determined that the mlv was not sealing, the denbury operator began to close the blow-down valve, in order to shut-down the operation for the evening. As the operator attempted to close the valve, after several attempts, he found that the handwheel on the gear operator would not turn. Because of the joule-thomson effect, associated with the mlv product blow-by, it is believed that the open 8' blowdown valve (that was in the flow path of the leaking mlv) froze in the open position due to internal ice formation. Due to the potential of public impact, the yazoo county ema was notified at 20:26 and msdeq emergency services was notified at 20:34. The national response center (nrc) was then notified at 21:21 (nrc #1289255). Due to the proximity of the release to highway 3, the highway was shut down to avoid the possibility of a vehicle accident due to low visibility caused by the CO2 cloud. As an additional precaution, emergency response contractors were dispatched to conduct air-monitoring in the surrounding area, to ensure the safety of the response personnel and local public. Atmospheric testing in and around the release site was continuously conducted throughout the night. All areas being monitored maintained adequate oxygen levels throughout the duration of the release. On 10/8/2020 at 18:00, once the pipeline segment pressure had been reduced enough to prevent additional CO2 blowby through the mlv, the blowdown valve thawed enough to allow it to be closed. Once the blowdown valve was closed, the product release was stopped, and highway 3 was re-opened. On 10/9/2020 at 15:43, the nrc was contacted to submit an update (nrc #1289386) to the original nrc report. On 10/12/2020, all valves at the satartia mlv location were flushed and lubricated and determined to be in working order. Once the temporary weld caps were removed and replaced with tested pipe, the pipeline was restarted on 10/26/2020 at 12:30 with no issues. |
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