Incident details
Operator, cause, commodity and consequences with raw source fields.
HL incident on 2012-11-20 — TX
Operator
Enbridge Energy, Limited Partnership
Cause
Corrosion Failure
Commodity
Crude Oil
Program
HL
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$2,000,000
Incident datetime
2012-11-20 14:33
Report number
Location
TX
Narrative
Enbridge's edmonton control center received a call on november 20, 2012 at approximately 12:48 local time, from bp chicap personnel at the mokena delivery site, indicating they were investigating oil on the ground within the facility. Bp made the initial call to the nrc as documented in part a #4 on the PHMSA f 7000-1. Enbridge's line 6a and line 14 each have a delivery line into this facility. At the time of bp's call into enbridge's ecc, line 6a was not delivering into mokena, and line 14 was delivering to the exxon mobil facility at mokena. Line 14 was shut down until further investigation of the release source could be completed by bp chicap and enbridge field personnel. Enbridge personnel discovered the leak was in the area of tank 12, near the location of an enbridge relief line. All delivery and relief lines from the adjacent enbridge station to bp chicap were locked out until field personnel could positively identify the source of the oil. On november 21 at approximately 18:00 the leak was confirmed to be on the enbridge relief line near tank 12. The relief line piping was manufactured by uss and is comprised of 20" diameter pipe by 0.250" nominal wall thickness, API 5l grade x42 line pipe steel that was installed in 1993 with a high frequency electric resistance welded seam and fusion bond epoxy coating. When it was discovered that the leak was on the enbridge relief line, enbridge completed a call to the nrc at 19:14 on november 21, nrc# 1031299 as documented in part a #7. Further investigation of the source of oil revealed that there was no check valve and the relief line was exposed to head pressure from tank 13. In order to provide alternate safe delivery operations to exxon mobil at the mokena facility while the pressure relief system is out of service for repair, a temporary procedure was developed until the relief lines are back in operation. The initial piece of failed piping was cut out and has been replaced. It was suspected at the time the cause of the failure was internal corrosion, due to the failure occurring in a low spot. At the same time this repair was done, enbridge started an elevation study to identify other low spots on the relief line and to determine if internal corrosion may exist in other locations. A defect was discovered during sandblasting in preparation for nde. That segment was cut out and replaced. Nde confirmed pipe integrity at all other tested locations with the exception of the line near tank 13, which was not completely excavated. A flange and blind was installed to isolate the relief line upstream of the aforementioned piping to tank 13. A hydrotest was successfully completed on the segment of the relief line to tank 11, and that segment has been placed back into service. Repairs continue and it is anticipated they will be complete by the end of first quarter 2013. Cleanup and restoration of the site is in progress and it is anticipated to be completed by the end of january 2013. Update - 5/7/13 metallurgical analysis confirmed internal corrosion as the cause. Repairs, clean up and restoration have been completed with the exception of a separate section of this line that ties into a different tank as a back-up in case bp takes their tank out of service. An outage is scheduled for july 24, 2013 to complete this work. Approximately 20,200 yards of contaminated soil has been removed from the release site. Update - 9/27/13 scheduled outage was pushed back with a new completion date of october 9, 2013. Update - 4/22/14 the final repair work was successfully completed on march 24, 2014.
Detailed record list
Report Received Date
2012-12-20 00:00:00
Iyear
2012
Report Number
20120369
Supplemental Number
20541
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
2012-11-20 14:33:00
Location Latitude
41.55556
Location Longitude
-87.88528
Commodity Released Type
Crude Oil
Unintentional Release Bbls
900
Recovered Bbls
900
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Accident Identifier
Local Operating Personnel, Including Contractors
Operator Type
Operator Employee
Incident Identified Datetime
2012-11-20 14:33:00
System Part Involved
Onshore Terminal/tank Farm Equipment And Piping
On Off Shore
Onshore
Shutdown Due Accident Ind
Yes
Shutdown Datetime
2012-11-20 14:48:00
Restart Datetime
2012-11-20 21:30:00
On Site Datetime
2012-11-20 14:33:00
Nrc Rpt Datetime
2012-11-21 19:14:00
Nrc Rpt Num
1031299
Ignite Ind
No
Explode Ind
No
Num Pub Evacuated
0
Pipe Fac Name
Enbridge Line 6a And 14 Pressure Relieve Line
Segment Name
Pressure Relief Line To Mokena
Onshore State Abbreviation
Il
Onshore Postal Code
60448
Onshore City Name
Mokena
Onshore County Name
Will
Designated Location
Milepost/valve Station
Designated Name
Mk
Federal
No
Location Type
Totally Contained On Operator-Controlled Property
Incident Area Type
Underground
Incident Area Subtype
Under Soil
Depth Of Cover
72
Crossing
No
Pipe Facility Type
Interstate
Item Involved
Relief Line And Relief Equipment
Installation Year
1993
Material Involved
Carbon Steel
Release Type
Leak
Leak Type
Pinhole
Wildlife Impact Ind
No
Soil Contamination
Yes
Long Term Assessment
No
Remediation Ind
Yes
Soil Remed Ind
Yes
Water Contam Ind
No
Could Be Hca
Yes
Commodity Reached Hca
Yes
High Pop Ind
Yes
High Pop Yes No
Yes
Est Cost Oper Paid
0
Est Cost Gas Released
0
Est Cost Prop Damage
2000000
Est Cost Emergency
300000
Est Cost Environmental
5500000
Est Cost Other
2000000
Est Cost Other Details
Integrity Analysis And Inspections/hydrotesting
Prpty
9800000
Accident Psig
40
Mop Psig
275
Accident Pressure
Pressure Did Not Exceed Mop
Pressure Restriction Ind
No
Pipeline Function
> 20% Smys Regulated Transmission
Scada In Place Ind
No
Cpm In Place Ind
No
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
Corrosion Failure
Cause Details
Internal Corrosion
Internal External
Internal Corrosion
Int Visual Exam Results
Localized Pitting
Int Water Acid Ind
Yes
Int Microbiological Ind
Yes
Int Field Exam Basis Ind
Yes
Int Metallurgical Basis Ind
Yes
Int Low Point Pipe Loc Ind
Yes
Corrosion Inhibitors
No
Corrosion Lining
No
Cleaning Dewatering
Not Applicable - Not Mainline Pipe
Corrosion Coupons
Not Applicable - Not Mainline Pipe
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
2015-06-24 00:00:00
Authorizer Name
R** C*******
Authorizer Telephone
218-464-5743
Authorizer Title
Manager Us Pipeline Compliance
Authorizer Email
R***********@e*******.com
Narrative
Enbridge's edmonton control center received a call on november 20, 2012 at approximately 12:48 local time, from bp chicap personnel at the mokena delivery site, indicating they were investigating oil on the ground within the facility. Bp made the initial call to the nrc as documented in part a #4 on the PHMSA f 7000-1. Enbridge's line 6a and line 14 each have a delivery line into this facility. At the time of bp's call into enbridge's ecc, line 6a was not delivering into mokena, and line 14 was delivering to the exxon mobil facility at mokena. Line 14 was shut down until further investigation of the release source could be completed by bp chicap and enbridge field personnel. Enbridge personnel discovered the leak was in the area of tank 12, near the location of an enbridge relief line. All delivery and relief lines from the adjacent enbridge station to bp chicap were locked out until field personnel could positively identify the source of the oil. On november 21 at approximately 18:00 the leak was confirmed to be on the enbridge relief line near tank 12. The relief line piping was manufactured by uss and is comprised of 20" diameter pipe by 0.250" nominal wall thickness, API 5l grade x42 line pipe steel that was installed in 1993 with a high frequency electric resistance welded seam and fusion bond epoxy coating. When it was discovered that the leak was on the enbridge relief line, enbridge completed a call to the nrc at 19:14 on november 21, nrc# 1031299 as documented in part a #7. Further investigation of the source of oil revealed that there was no check valve and the relief line was exposed to head pressure from tank 13. In order to provide alternate safe delivery operations to exxon mobil at the mokena facility while the pressure relief system is out of service for repair, a temporary procedure was developed until the relief lines are back in operation. The initial piece of failed piping was cut out and has been replaced. It was suspected at the time the cause of the failure was internal corrosion, due to the failure occurring in a low spot. At the same time this repair was done, enbridge started an elevation study to identify other low spots on the relief line and to determine if internal corrosion may exist in other locations. A defect was discovered during sandblasting in preparation for nde. That segment was cut out and replaced. Nde confirmed pipe integrity at all other tested locations with the exception of the line near tank 13, which was not completely excavated. A flange and blind was installed to isolate the relief line upstream of the aforementioned piping to tank 13. A hydrotest was successfully completed on the segment of the relief line to tank 11, and that segment has been placed back into service. Repairs continue and it is anticipated they will be complete by the end of first quarter 2013. Cleanup and restoration of the site is in progress and it is anticipated to be completed by the end of january 2013. Update - 5/7/13 metallurgical analysis confirmed internal corrosion as the cause. Repairs, clean up and restoration have been completed with the exception of a separate section of this line that ties into a different tank as a back-up in case bp takes their tank out of service. An outage is scheduled for july 24, 2013 to complete this work. Approximately 20,200 yards of contaminated soil has been removed from the release site. Update - 9/27/13 scheduled outage was pushed back with a new completion date of october 9, 2013. Update - 4/22/14 the final repair work was successfully completed on march 24, 2014.
| Report Received Date | 2012-12-20 00:00:00 |
|---|---|
| Iyear | 2012 |
| Report Number | 20120369 |
| Supplemental Number | 20541 |
| 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 | 2012-11-20 14:33:00 |
| Location Latitude | 41.55556 Google Maps OpenStreetMap |
| Location Longitude | -87.88528 Google Maps OpenStreetMap |
| Commodity Released Type | Crude Oil |
| Unintentional Release Bbls | 900 |
| Recovered Bbls | 900 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Accident Identifier | Local Operating Personnel, Including Contractors |
| Operator Type | Operator Employee |
| Incident Identified Datetime | 2012-11-20 14:33:00 |
| System Part Involved | Onshore Terminal/tank Farm Equipment And Piping |
| On Off Shore | Onshore |
| Shutdown Due Accident Ind | Yes |
| Shutdown Datetime | 2012-11-20 14:48:00 |
| Restart Datetime | 2012-11-20 21:30:00 |
| On Site Datetime | 2012-11-20 14:33:00 |
| Nrc Rpt Datetime | 2012-11-21 19:14:00 |
| Nrc Rpt Num | 1031299 NRC Report How to search |
| Ignite Ind | No |
| Explode Ind | No |
| Num Pub Evacuated | 0 |
| Pipe Fac Name | Enbridge Line 6a And 14 Pressure Relieve Line |
| Segment Name | Pressure Relief Line To Mokena |
| Onshore State Abbreviation | Il |
| Onshore Postal Code | 60448 |
| Onshore City Name | Mokena |
| Onshore County Name | Will |
| Designated Location | Milepost/valve Station |
| Designated Name | Mk |
| Federal | No |
| Location Type | Totally Contained On Operator-Controlled Property |
| Incident Area Type | Underground |
| Incident Area Subtype | Under Soil |
| Depth Of Cover | 72 |
| Crossing | No |
| Pipe Facility Type | Interstate |
| Item Involved | Relief Line And Relief Equipment |
| Installation Year | 1993 |
| Material Involved | Carbon Steel |
| Release Type | Leak |
| Leak Type | Pinhole |
| Wildlife Impact Ind | No |
| Soil Contamination | Yes |
| Long Term Assessment | No |
| Remediation Ind | Yes |
| Soil Remed Ind | Yes |
| Water Contam Ind | No |
| Could Be Hca | Yes |
| Commodity Reached Hca | Yes |
| High Pop Ind | Yes |
| High Pop Yes No | Yes |
| Est Cost Oper Paid | 0 |
| Est Cost Gas Released | 0 |
| Est Cost Prop Damage | 2000000 |
| Est Cost Emergency | 300000 |
| Est Cost Environmental | 5500000 |
| Est Cost Other | 2000000 |
| Est Cost Other Details | Integrity Analysis And Inspections/hydrotesting |
| Prpty | 9800000 |
| Accident Psig | 40 |
| Mop Psig | 275 |
| Accident Pressure | Pressure Did Not Exceed Mop |
| Pressure Restriction Ind | No |
| Pipeline Function | > 20% Smys Regulated Transmission |
| Scada In Place Ind | No |
| Cpm In Place Ind | No |
| 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 | Corrosion Failure |
| Cause Details | Internal Corrosion |
| Internal External | Internal Corrosion |
| Int Visual Exam Results | Localized Pitting |
| Int Water Acid Ind | Yes |
| Int Microbiological Ind | Yes |
| Int Field Exam Basis Ind | Yes |
| Int Metallurgical Basis Ind | Yes |
| Int Low Point Pipe Loc Ind | Yes |
| Corrosion Inhibitors | No |
| Corrosion Lining | No |
| Cleaning Dewatering | Not Applicable - Not Mainline Pipe |
| Corrosion Coupons | Not Applicable - Not Mainline Pipe |
| 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 | 2015-06-24 00:00:00 |
| Authorizer Name | R** C******* |
| Authorizer Telephone | 218-464-5743 |
| Authorizer Title | Manager Us Pipeline Compliance |
| Authorizer Email | R***********@e*******.com |
| Narrative | Enbridge's edmonton control center received a call on november 20, 2012 at approximately 12:48 local time, from bp chicap personnel at the mokena delivery site, indicating they were investigating oil on the ground within the facility. Bp made the initial call to the nrc as documented in part a #4 on the PHMSA f 7000-1. Enbridge's line 6a and line 14 each have a delivery line into this facility. At the time of bp's call into enbridge's ecc, line 6a was not delivering into mokena, and line 14 was delivering to the exxon mobil facility at mokena. Line 14 was shut down until further investigation of the release source could be completed by bp chicap and enbridge field personnel. Enbridge personnel discovered the leak was in the area of tank 12, near the location of an enbridge relief line. All delivery and relief lines from the adjacent enbridge station to bp chicap were locked out until field personnel could positively identify the source of the oil. On november 21 at approximately 18:00 the leak was confirmed to be on the enbridge relief line near tank 12. The relief line piping was manufactured by uss and is comprised of 20" diameter pipe by 0.250" nominal wall thickness, API 5l grade x42 line pipe steel that was installed in 1993 with a high frequency electric resistance welded seam and fusion bond epoxy coating. When it was discovered that the leak was on the enbridge relief line, enbridge completed a call to the nrc at 19:14 on november 21, nrc# 1031299 as documented in part a #7. Further investigation of the source of oil revealed that there was no check valve and the relief line was exposed to head pressure from tank 13. In order to provide alternate safe delivery operations to exxon mobil at the mokena facility while the pressure relief system is out of service for repair, a temporary procedure was developed until the relief lines are back in operation. The initial piece of failed piping was cut out and has been replaced. It was suspected at the time the cause of the failure was internal corrosion, due to the failure occurring in a low spot. At the same time this repair was done, enbridge started an elevation study to identify other low spots on the relief line and to determine if internal corrosion may exist in other locations. A defect was discovered during sandblasting in preparation for nde. That segment was cut out and replaced. Nde confirmed pipe integrity at all other tested locations with the exception of the line near tank 13, which was not completely excavated. A flange and blind was installed to isolate the relief line upstream of the aforementioned piping to tank 13. A hydrotest was successfully completed on the segment of the relief line to tank 11, and that segment has been placed back into service. Repairs continue and it is anticipated they will be complete by the end of first quarter 2013. Cleanup and restoration of the site is in progress and it is anticipated to be completed by the end of january 2013. Update - 5/7/13 metallurgical analysis confirmed internal corrosion as the cause. Repairs, clean up and restoration have been completed with the exception of a separate section of this line that ties into a different tank as a back-up in case bp takes their tank out of service. An outage is scheduled for july 24, 2013 to complete this work. Approximately 20,200 yards of contaminated soil has been removed from the release site. Update - 9/27/13 scheduled outage was pushed back with a new completion date of october 9, 2013. Update - 4/22/14 the final repair work was successfully completed on march 24, 2014. |
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