Incident details
Operator, cause, commodity and consequences with raw source fields.
HL incident on 2023-11-02 — TX
Operator
Enbridge Storage (Cushing) L.l.c.
Cause
Incorrect Operation
Commodity
Crude Oil
Program
HL
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$0
Incident datetime
2023-11-02 00:00 UTC
Report number
Location
TX
Narrative
On october 5, 2023, after manifolds m107 and m207 were drained successfully, two foam pig's were loaded into the launching trap to purge the 8" allied lateral. Nitrogen was introduced to the system. Ten above ground monitoring (agm) stations were located along the pipe segment at approximately 1-mile intervals to identify the pig's as they traveled from the launching trap to the receiving trap. Pig trackers were unable to identify pig's at agm 9 and 10 after resumption of nitrogen injection. At approximately 2:10 pm cdt a release occurred when the nitrogen that was pushing the pig bypassed it and burped the seal on tank 2514. The initial volume on the tank roof was approximately 3 barrels of crude oil intermixed with water. Operations personnel requested 3 vacuum trucks to begin draining volume from tank 2514 roof drain. Additional crude oil was observed releasing from the tank legs throughout the night necessitating the request of 3 frac tanks. All crude oil and water mixture was drained into the frac tanks of which approximately 1220 barrels was estimated to be crude oil and returned to the system. The nrc was notified on october 6, 2023, at 9:08 am cdt (nrc# 1381026) when the cleanup costs were expected to exceed the nrc reporting threshold. A 48-hour update to the nrc was made on october 8, 2023, at 12:02 pm cdt. No crude oil reached the ground and was fully contained on the tank roof. Cleanup was completed on the roof of tank 2514 on october 11, 2023. The cause of the release is attributed to inadequate monitoring of the location of the pig's while injection of nitrogen continued to flow. The pressure of nitrogen introduced into tank 2514 caused crude oil to release from the tank's primary/secondary seals and roof legs as the gas escaped the tank.
Detailed record list
Report Received Date
2023-11-02 00:00:00
Iyear
2023
Report Number
20230259
Supplemental Number
38740
Report Type
Original Final
Operator Id
39145
Name
Enbridge Storage (Cushing) L.l.c.
Operator Street Address
915 N Eldridge Parkway, Suite 1100
Operator City Name
Houston
Operator State Abbreviation
TX
Operator Postal Code
77079
Time Zone
Central
Daylight Savings Ind
Yes
Location Latitude
36.016222
Location Longitude
-96.757033
Commodity Released Type
Crude Oil
Unintentional Release Bbls
1220
Recovered Bbls
1220
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Accident Identifier
Local Operating Personnel, Including Contractors
Operator Type
Operator Employee
System Part Involved
Onshore Breakout Tank Or Storage Vessel, Including Attached Appurtenances
On Off Shore
Onshore
Status When Identified
Normal Operation, Includes Pauses Between Batches And During Maintenance
Shutdown Due Accident Ind
No
Shutdown Explain
The Incident Was Discovered After Field Operations Shut The Movement Down.
Communication State Fed Ind
No
Nrc Rpt Num
1381026
Additional Nrc Report Numbers
1381197
Ignite Ind
No
Notify Qualified Indiv Ind
No
Oil Spill Removal Org Ind
No
Num Pub Evacuated
0
Pipe Fac Name
Grandstaff Terminal
Segment Name
Tank 2514
Onshore State Abbreviation
Ok
Onshore Postal Code
74023
Onshore City Name
Cushing
Onshore County Name
Payne
Designated Location
Milepost
Designated Name
Cg
Federal
No
Location Type
Totally Contained On Operator-Controlled Property
Incident Area Type
Tank, Including Attached Appurtenances
Crossing
No
Pipe Facility Type
Interstate
Item Involved
Tank/vessel
Tank Vessel Subtype
Roof/roof Seal
Tank Type
Atmospheric
Safe Fill Level
13
Safe Fill Level Exceeded Ind
Yes
Api Std Out Of Service Year
2017
Api Std In Service Year
2022
Installation Year
2007
Manufactured Year
2007
Material Involved
Carbon Steel
Release Type
Other
Release Type Details
Nitrogen Purge Burped Tank Seal
Wildlife Impact Ind
No
Soil Contamination
No
Long Term Assessment
No
Remediation Ind
No
Water Contam Ind
No
Could Be Hca
Yes
Commodity Reached Hca
No
Est Cost Oper Paid
0
Est Cost Gas Released
0
Est Cost Prop Damage
0
Est Cost Emergency
36000
Est Cost Environmental
0
Est Cost Other
0
Prpty
36000
Num Persons Hosp Not Ovnght
0
Num Injured Treated By Emt
0
Num Resident Building Affctd
0
Num Business Building Affctd
0
Accident Psig
140
Pressure Restriction 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
Lack of control center involvement. All aspects of the movement were performed by field operations.
Employee Drug Test Ind
No
Contractor Drug Test Ind
No
Cause
Incorrect Operation
Cause Details
Tank, Vessel, Or Sump/separator Allowed Or Caused To Overfill Or Overflow
Operation Type
Tank, Vessel, Or Sump/separator Allowed Or Caused To Overfill Or Overflow
Overflow Other Ind
Inadequate Monitoring
Related Other Ind
Yes
Operation Related Details
Inadequate Pig Tracking
Category Type
Other Maintenance
Operator Qualification Ind
No
Preparer Name
S**** S****
Preparer Title
Advisor Regulatory Compliance
Preparer Email
S**********@e*******.com
Preparer Telephone
7153953620
Prepared Date
2023-11-02 00:00:00
Authorizer Name
L*** S**********
Authorizer Telephone
7153941584
Authorizer Title
Supervisor Regulatory Compliance
Authorizer Email
L***************@e*******.com
Narrative
On october 5, 2023, after manifolds m107 and m207 were drained successfully, two foam pig's were loaded into the launching trap to purge the 8" allied lateral. Nitrogen was introduced to the system. Ten above ground monitoring (agm) stations were located along the pipe segment at approximately 1-mile intervals to identify the pig's as they traveled from the launching trap to the receiving trap. Pig trackers were unable to identify pig's at agm 9 and 10 after resumption of nitrogen injection. At approximately 2:10 pm cdt a release occurred when the nitrogen that was pushing the pig bypassed it and burped the seal on tank 2514. The initial volume on the tank roof was approximately 3 barrels of crude oil intermixed with water. Operations personnel requested 3 vacuum trucks to begin draining volume from tank 2514 roof drain. Additional crude oil was observed releasing from the tank legs throughout the night necessitating the request of 3 frac tanks. All crude oil and water mixture was drained into the frac tanks of which approximately 1220 barrels was estimated to be crude oil and returned to the system. The nrc was notified on october 6, 2023, at 9:08 am cdt (nrc# 1381026) when the cleanup costs were expected to exceed the nrc reporting threshold. A 48-hour update to the nrc was made on october 8, 2023, at 12:02 pm cdt. No crude oil reached the ground and was fully contained on the tank roof. Cleanup was completed on the roof of tank 2514 on october 11, 2023. The cause of the release is attributed to inadequate monitoring of the location of the pig's while injection of nitrogen continued to flow. The pressure of nitrogen introduced into tank 2514 caused crude oil to release from the tank's primary/secondary seals and roof legs as the gas escaped the tank.
| Report Received Date | 2023-11-02 00:00:00 |
|---|---|
| Iyear | 2023 |
| Report Number | 20230259 |
| Supplemental Number | 38740 |
| Report Type | Original Final |
| Operator Id | 39145 PHMSA Enforcement |
| Name | Enbridge Storage (Cushing) L.l.c. |
| Operator Street Address | 915 N Eldridge Parkway, Suite 1100 |
| Operator City Name | Houston |
| Operator State Abbreviation | TX |
| Operator Postal Code | 77079 |
| Time Zone | Central |
| Daylight Savings Ind | Yes |
| Location Latitude | 36.016222 Google Maps OpenStreetMap |
| Location Longitude | -96.757033 Google Maps OpenStreetMap |
| Commodity Released Type | Crude Oil |
| Unintentional Release Bbls | 1220 |
| Recovered Bbls | 1220 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Accident Identifier | Local Operating Personnel, Including Contractors |
| Operator Type | Operator Employee |
| System Part Involved | Onshore Breakout Tank Or Storage Vessel, Including Attached Appurtenances |
| On Off Shore | Onshore |
| Status When Identified | Normal Operation, Includes Pauses Between Batches And During Maintenance |
| Shutdown Due Accident Ind | No |
| Shutdown Explain | The Incident Was Discovered After Field Operations Shut The Movement Down. |
| Communication State Fed Ind | No |
| Nrc Rpt Num | 1381026 NRC Report How to search |
| Additional Nrc Report Numbers | 1381197 |
| Ignite Ind | No |
| Notify Qualified Indiv Ind | No |
| Oil Spill Removal Org Ind | No |
| Num Pub Evacuated | 0 |
| Pipe Fac Name | Grandstaff Terminal |
| Segment Name | Tank 2514 |
| Onshore State Abbreviation | Ok |
| Onshore Postal Code | 74023 |
| Onshore City Name | Cushing |
| Onshore County Name | Payne |
| Designated Location | Milepost |
| Designated Name | Cg |
| Federal | No |
| Location Type | Totally Contained On Operator-Controlled Property |
| Incident Area Type | Tank, Including Attached Appurtenances |
| Crossing | No |
| Pipe Facility Type | Interstate |
| Item Involved | Tank/vessel |
| Tank Vessel Subtype | Roof/roof Seal |
| Tank Type | Atmospheric |
| Safe Fill Level | 13 |
| Safe Fill Level Exceeded Ind | Yes |
| Api Std Out Of Service Year | 2017 |
| Api Std In Service Year | 2022 |
| Installation Year | 2007 |
| Manufactured Year | 2007 |
| Material Involved | Carbon Steel |
| Release Type | Other |
| Release Type Details | Nitrogen Purge Burped Tank Seal |
| Wildlife Impact Ind | No |
| Soil Contamination | No |
| Long Term Assessment | No |
| Remediation Ind | No |
| Water Contam Ind | No |
| Could Be Hca | Yes |
| Commodity Reached Hca | No |
| Est Cost Oper Paid | 0 |
| Est Cost Gas Released | 0 |
| Est Cost Prop Damage | 0 |
| Est Cost Emergency | 36000 |
| Est Cost Environmental | 0 |
| Est Cost Other | 0 |
| Prpty | 36000 |
| Num Persons Hosp Not Ovnght | 0 |
| Num Injured Treated By Emt | 0 |
| Num Resident Building Affctd | 0 |
| Num Business Building Affctd | 0 |
| Accident Psig | 140 |
| Pressure Restriction 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 | Lack of control center involvement. All aspects of the movement were performed by field operations. |
| Employee Drug Test Ind | No |
| Contractor Drug Test Ind | No |
| Cause | Incorrect Operation |
| Cause Details | Tank, Vessel, Or Sump/separator Allowed Or Caused To Overfill Or Overflow |
| Operation Type | Tank, Vessel, Or Sump/separator Allowed Or Caused To Overfill Or Overflow |
| Overflow Other Ind | Inadequate Monitoring |
| Related Other Ind | Yes |
| Operation Related Details | Inadequate Pig Tracking |
| Category Type | Other Maintenance |
| Operator Qualification Ind | No |
| Preparer Name | S**** S**** |
| Preparer Title | Advisor Regulatory Compliance |
| Preparer Email | S**********@e*******.com |
| Preparer Telephone | 7153953620 |
| Prepared Date | 2023-11-02 00:00:00 |
| Authorizer Name | L*** S********** |
| Authorizer Telephone | 7153941584 |
| Authorizer Title | Supervisor Regulatory Compliance |
| Authorizer Email | L***************@e*******.com |
| Narrative | On october 5, 2023, after manifolds m107 and m207 were drained successfully, two foam pig's were loaded into the launching trap to purge the 8" allied lateral. Nitrogen was introduced to the system. Ten above ground monitoring (agm) stations were located along the pipe segment at approximately 1-mile intervals to identify the pig's as they traveled from the launching trap to the receiving trap. Pig trackers were unable to identify pig's at agm 9 and 10 after resumption of nitrogen injection. At approximately 2:10 pm cdt a release occurred when the nitrogen that was pushing the pig bypassed it and burped the seal on tank 2514. The initial volume on the tank roof was approximately 3 barrels of crude oil intermixed with water. Operations personnel requested 3 vacuum trucks to begin draining volume from tank 2514 roof drain. Additional crude oil was observed releasing from the tank legs throughout the night necessitating the request of 3 frac tanks. All crude oil and water mixture was drained into the frac tanks of which approximately 1220 barrels was estimated to be crude oil and returned to the system. The nrc was notified on october 6, 2023, at 9:08 am cdt (nrc# 1381026) when the cleanup costs were expected to exceed the nrc reporting threshold. A 48-hour update to the nrc was made on october 8, 2023, at 12:02 pm cdt. No crude oil reached the ground and was fully contained on the tank roof. Cleanup was completed on the roof of tank 2514 on october 11, 2023. The cause of the release is attributed to inadequate monitoring of the location of the pig's while injection of nitrogen continued to flow. The pressure of nitrogen introduced into tank 2514 caused crude oil to release from the tank's primary/secondary seals and roof legs as the gas escaped the tank. |
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