Incident details
Operator, cause, commodity and consequences with raw source fields.
HL incident on 2013-11-06 — TX
Operator
Enbridge Energy, Limited Partnership
Cause
Equipment Failure
Commodity
Crude Oil
Program
HL
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$7,000
Incident datetime
2013-11-06 09:13
Report number
Location
TX
Narrative
On october 23 a technician noticed what appeared to be oil on the ground near the line 6 unit 4 discharge valve at the superior terminal. After further investigation and excavation of the area that day, it appeared to be contaminated soil from a historic leak that occurred in july 2000 when a significant volume of crude oil was released in that same area. Cleanup of the contaminated soil commenced. Multiple flanges were excavated, the line 6 unit 4 pump was locked out, and the area continuously monitored. On november 6 an active leak was confirmed by plm personnel to be coming from the flange off the l6 unit 4 discharge valve. The leak was very intermittent and would come and go with a small drop of oil. The pipeline maintenance personnel replaced the bolts and re-torqued the flange on november 11 in conjunction with a previously unrelated scheduled shutdown of line 6. The unit was placed back into service later that same day. The cause of the leak is currently under investigation. There was approximately 258 cubic yards of contaminated soil removed from the site. The internal investigation revealed the cause of the leak was that the flange fasteners were not at the proper torque value. The final repair will be the replacement of the unit valve and check valve flange gaskets. This is scheduled to be completed fall 2014.
Detailed record list
Report Received Date
2013-12-06 00:00:00
Iyear
2013
Report Number
20130389
Supplemental Number
19320
Report Type
Supplemental Final
Operator Id
11169
Name
Enbridge Energy, Limited Partnership
Operator Street Address
915 N Eldridge Parkway, Suite 1100
Operator City Name
Houston
Operator State Abbreviation
TX
Operator Postal Code
77079
Local Datetime
2013-11-06 09:13:00
Location Latitude
46.69
Location Longitude
-92.06
Commodity Released Type
Crude Oil
Unintentional Release Bbls
0.24
Recovered Bbls
0.24
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Accident Identifier
Local Operating Personnel, Including Contractors
Operator Type
Operator Employee
Incident Identified Datetime
2013-11-06 09:13:00
System Part Involved
Onshore Pump/meter Station Equipment And Piping
On Off Shore
Onshore
Shutdown Due Accident Ind
No
Shutdown Explain
Line 6 Unit 4 Was Only Locked Out
On Site Datetime
2013-11-06 09:13:00
Ignite Ind
No
Explode Ind
No
Num Pub Evacuated
0
Pipe Fac Name
6/pe
Segment Name
Line 6 Unit 4
Onshore State Abbreviation
Wi
Onshore Postal Code
54880
Onshore City Name
Superior
Onshore County Name
Douglas
Designated Location
Milepost/valve Station
Federal
No
Location Type
Totally Contained On Operator-Controlled Property
Incident Area Type
Underground
Incident Area Subtype
Under Soil
Depth Of Cover
36
Crossing
No
Pipe Facility Type
Interstate
Item Involved
Flange Assembly
Installation Year
1988
Material Involved
Carbon Steel
Release Type
Leak
Leak Type
Connection Failure
Wildlife Impact Ind
No
Soil Contamination
Yes
Long Term Assessment
Yes
Remediation Ind
No
Water Contam Ind
Yes
Groundwater Contam Ind
Yes
Amount Released
0.12
Rel Water Name
Groundwater
Could Be Hca
Yes
Commodity Reached Hca
Yes
Commercially Nav Ind
Yes
Commercially Nav Yes No
Yes
High Pop Ind
Yes
High Pop Yes No
Yes
Other Pop Ind
Yes
Other Pop Yes No
Yes
Usa Drinking Ind
Yes
Usa Drinking Yes No
Yes
Est Cost Oper Paid
0
Est Cost Gas Released
0
Est Cost Prop Damage
7000
Est Cost Emergency
4200
Est Cost Environmental
20000
Est Cost Other
0
Prpty
31200
Accident Psig
420
Mop Psig
1102
Accident Pressure
Pressure Did Not Exceed Mop
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
Yes
Cpm Operating Ind
Yes
Cpm Functional Ind
Yes
Cpm Detection Ind
No
Cpm Conf 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 control center reviewed pressures leading up to the leak notification, and an abnormal condition was not identified that would indicate any controller or control room issues.
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
Eq Additional Other Ind
Yes
Eq Additional Other Details
Potential Factors: Improper Installation And/or Bolts Became Loose Over Time
Preparer Name
S**** S****
Preparer Title
Compliance Analyst
Preparer Email
S**********@e*******.com
Preparer Telephone
218-464-5754
Preparer Fax
218-464-5992
Prepared Date
2014-04-25 00:00:00
Authorizer Name
D**** S*******
Authorizer Telephone
218-464-5751
Authorizer Title
Manager Us Pipeline Compliance
Authorizer Email
D*************@e*******.com
Narrative
On october 23 a technician noticed what appeared to be oil on the ground near the line 6 unit 4 discharge valve at the superior terminal. After further investigation and excavation of the area that day, it appeared to be contaminated soil from a historic leak that occurred in july 2000 when a significant volume of crude oil was released in that same area. Cleanup of the contaminated soil commenced. Multiple flanges were excavated, the line 6 unit 4 pump was locked out, and the area continuously monitored. On november 6 an active leak was confirmed by plm personnel to be coming from the flange off the l6 unit 4 discharge valve. The leak was very intermittent and would come and go with a small drop of oil. The pipeline maintenance personnel replaced the bolts and re-torqued the flange on november 11 in conjunction with a previously unrelated scheduled shutdown of line 6. The unit was placed back into service later that same day. The cause of the leak is currently under investigation. There was approximately 258 cubic yards of contaminated soil removed from the site. The internal investigation revealed the cause of the leak was that the flange fasteners were not at the proper torque value. The final repair will be the replacement of the unit valve and check valve flange gaskets. This is scheduled to be completed fall 2014.
| Report Received Date | 2013-12-06 00:00:00 |
|---|---|
| Iyear | 2013 |
| Report Number | 20130389 |
| Supplemental Number | 19320 |
| Report Type | Supplemental Final |
| Operator Id | 11169 PHMSA Enforcement |
| Name | Enbridge Energy, Limited Partnership |
| Operator Street Address | 915 N Eldridge Parkway, Suite 1100 |
| Operator City Name | Houston |
| Operator State Abbreviation | TX |
| Operator Postal Code | 77079 |
| Local Datetime | 2013-11-06 09:13:00 |
| Location Latitude | 46.69 Google Maps OpenStreetMap |
| Location Longitude | -92.06 Google Maps OpenStreetMap |
| Commodity Released Type | Crude Oil |
| Unintentional Release Bbls | 0.24 |
| Recovered Bbls | 0.24 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Accident Identifier | Local Operating Personnel, Including Contractors |
| Operator Type | Operator Employee |
| Incident Identified Datetime | 2013-11-06 09:13:00 |
| System Part Involved | Onshore Pump/meter Station Equipment And Piping |
| On Off Shore | Onshore |
| Shutdown Due Accident Ind | No |
| Shutdown Explain | Line 6 Unit 4 Was Only Locked Out |
| On Site Datetime | 2013-11-06 09:13:00 |
| Ignite Ind | No |
| Explode Ind | No |
| Num Pub Evacuated | 0 |
| Pipe Fac Name | 6/pe |
| Segment Name | Line 6 Unit 4 |
| Onshore State Abbreviation | Wi |
| Onshore Postal Code | 54880 |
| Onshore City Name | Superior |
| Onshore County Name | Douglas |
| Designated Location | Milepost/valve Station |
| Federal | No |
| Location Type | Totally Contained On Operator-Controlled Property |
| Incident Area Type | Underground |
| Incident Area Subtype | Under Soil |
| Depth Of Cover | 36 |
| Crossing | No |
| Pipe Facility Type | Interstate |
| Item Involved | Flange Assembly |
| Installation Year | 1988 |
| Material Involved | Carbon Steel |
| Release Type | Leak |
| Leak Type | Connection Failure |
| Wildlife Impact Ind | No |
| Soil Contamination | Yes |
| Long Term Assessment | Yes |
| Remediation Ind | No |
| Water Contam Ind | Yes |
| Groundwater Contam Ind | Yes |
| Amount Released | 0.12 |
| Rel Water Name | Groundwater |
| Could Be Hca | Yes |
| Commodity Reached Hca | Yes |
| Commercially Nav Ind | Yes |
| Commercially Nav Yes No | Yes |
| High Pop Ind | Yes |
| High Pop Yes No | Yes |
| Other Pop Ind | Yes |
| Other Pop Yes No | Yes |
| Usa Drinking Ind | Yes |
| Usa Drinking Yes No | Yes |
| Est Cost Oper Paid | 0 |
| Est Cost Gas Released | 0 |
| Est Cost Prop Damage | 7000 |
| Est Cost Emergency | 4200 |
| Est Cost Environmental | 20000 |
| Est Cost Other | 0 |
| Prpty | 31200 |
| Accident Psig | 420 |
| Mop Psig | 1102 |
| Accident Pressure | Pressure Did Not Exceed Mop |
| 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 | Yes |
| Cpm Operating Ind | Yes |
| Cpm Functional Ind | Yes |
| Cpm Detection Ind | No |
| Cpm Conf 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 control center reviewed pressures leading up to the leak notification, and an abnormal condition was not identified that would indicate any controller or control room issues. |
| 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 |
| Eq Additional Other Ind | Yes |
| Eq Additional Other Details | Potential Factors: Improper Installation And/or Bolts Became Loose Over Time |
| Preparer Name | S**** S**** |
| Preparer Title | Compliance Analyst |
| Preparer Email | S**********@e*******.com |
| Preparer Telephone | 218-464-5754 |
| Preparer Fax | 218-464-5992 |
| Prepared Date | 2014-04-25 00:00:00 |
| Authorizer Name | D**** S******* |
| Authorizer Telephone | 218-464-5751 |
| Authorizer Title | Manager Us Pipeline Compliance |
| Authorizer Email | D*************@e*******.com |
| Narrative | On october 23 a technician noticed what appeared to be oil on the ground near the line 6 unit 4 discharge valve at the superior terminal. After further investigation and excavation of the area that day, it appeared to be contaminated soil from a historic leak that occurred in july 2000 when a significant volume of crude oil was released in that same area. Cleanup of the contaminated soil commenced. Multiple flanges were excavated, the line 6 unit 4 pump was locked out, and the area continuously monitored. On november 6 an active leak was confirmed by plm personnel to be coming from the flange off the l6 unit 4 discharge valve. The leak was very intermittent and would come and go with a small drop of oil. The pipeline maintenance personnel replaced the bolts and re-torqued the flange on november 11 in conjunction with a previously unrelated scheduled shutdown of line 6. The unit was placed back into service later that same day. The cause of the leak is currently under investigation. There was approximately 258 cubic yards of contaminated soil removed from the site. The internal investigation revealed the cause of the leak was that the flange fasteners were not at the proper torque value. The final repair will be the replacement of the unit valve and check valve flange gaskets. This is scheduled to be completed fall 2014. |
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