Incident details
Operator, cause, commodity and consequences with raw source fields.
HL incident on 2017-05-23 — TX
Operator
Enbridge Pipelines (Ozark) L.l.c.
Cause
Natural Force Damage
Commodity
Crude Oil
Program
HL
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$900,000
Incident datetime
2017-05-23 08:53
Report number
Location
TX
Narrative
On may 23, 2017 a marathon employee performing an inspection of remote valves sites on line 51 made enbridge aware that the 20" auxiliary valves (cg-51-29.63l) that connects to the 22" transmission pipeline at mp 29.63 showed evidence of crude oil seepage from the clamp ring. Enbridge regularly monitored these valves for leakage, however after notification that new seepage had been observed began visiting the valves daily to mitigate potential environmental impacts. Enbridge (the operator of the line 51 pipeline), in collaboration with marathon (the owner of the line 51 pipeline), decided to stop the seepage by injecting a sealant into the annular space between the bonnet of the valve and the clamp ring. A third party contractor was engaged and the repair strategy was planned and the injection of sealant took place in july. The auxiliary valves were monitored daily for two weeks to determine if the repair strategy was successful. As of august 8, the valves still showed evidence of seepage so another repair strategy that will be executed by marathon was determined to be necessary. The auxiliary 20" valves will be removed from the pipeline system and blind flanges will be installed in their place. New stopples will be installed at mp 29.63 to provide isolation. The nrc was notified at 17:38 cdt on august 8, 2017 (nrc#1186654) when it was determined that costs would exceed the $50,000 threshold for the new repair strategy. Approximately 1 gallon or less of crude oil had released into the valve containment area. The cause of the release has been determined to be due to thermal expansion. Shutdown and isolation was not required due to the nature and minimal volume of the leak; however, the PHMSA portal system required answers to part e, questions 5.A - 5.C. Which do not apply to this release.
Detailed record list
Report Received Date
2017-08-15 00:00:00
Iyear
2017
Report Number
20170253
Supplemental Number
22556
Report Type
Original Final
Operator Id
31947
Name
Enbridge Pipelines (Ozark) L.l.c.
Operator Street Address
915 N Eldridge Parkway, Suite 1100
Operator City Name
Houston
Operator State Abbreviation
TX
Operator Postal Code
77079
Local Datetime
2017-08-08 17:25:00
Location Latitude
36.2639
Location Longitude
-96.394422
Commodity Released Type
Crude Oil
Unintentional Release Bbls
0.02
Recovered Bbls
0.02
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Accident Identifier
Local Operating Personnel, Including Contractors
Operator Type
Operator Employee
Incident Identified Datetime
2017-05-23 08:53:00
System Part Involved
Onshore Pipeline, Including Valve Sites
On Off Shore
Onshore
Shutdown Due Accident Ind
No
Shutdown Explain
Shutdown And Isolation Was Not Required Due To The Nature And Minimal Volume
On Site Datetime
2017-05-23 08:53:00
Nrc Rpt Datetime
2017-08-08 17:38:00
Nrc Rpt Num
1186654
Ignite Ind
No
Explode Ind
No
Upstream Valve Type Ind
Remotely Controlled
Downstream Valve Type Ind
Remotely Controlled
Num Pub Evacuated
0
Pipe Fac Name
Line 51
Segment Name
Loop Valve Cg-51-29.63l
Onshore State Abbreviation
Ok
Onshore Postal Code
74020
Onshore City Name
Cleveland
Onshore County Name
Pawnee
Designated Location
Milepost/valve Station
Designated Name
Mp 29.63
Federal
No
Location Type
Pipeline Right-Of-Way
Incident Area Type
Aboveground
Incident Area Subtype
Inside Other Enclosed Space
Crossing
No
Pipe Facility Type
Interstate
Item Involved
Valve
Valve Type
Auxiliary Or Other Valve
Installation Year
1948
Material Involved
Carbon Steel
Release Type
Leak
Leak Type
Seal Or Packing
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
Yes
Commercially Nav Ind
Yes
Commercially Nav Yes No
Yes
Usa Ecological Ind
Yes
Usa Ecological Yes No
Yes
Est Cost Oper Paid
0
Est Cost Gas Released
0
Est Cost Prop Damage
900000
Est Cost Emergency
0
Est Cost Environmental
0
Est Cost Other
0
Prpty
900000
Accident Psig
178
Mop Psig
778
Accident Pressure
Pressure Did Not Exceed Mop
Pressure Restriction Ind
No
Length Segment Isolated
125822
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
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
Lack control center involvement
Employee Drug Test Ind
No
Contractor Drug Test Ind
No
Cause
Natural Force Damage
Cause Details
Temperature
Natural Force Type
Temperature
Temperature Subtype
Thermal Stress
Nf Extreme Weather Ind
No
Preparer Name
S**** S****
Preparer Title
Compliance Analyst
Preparer Email
S**********@e*******.com
Preparer Telephone
715-395-3620
Preparer Fax
715-398-4802
Prepared Date
2017-08-15 00:00:00
Authorizer Name
R** C*******
Authorizer Telephone
715-395-3619
Authorizer Title
Supervisor Us Pipeline Compliance
Authorizer Email
R***********@e*******.com
Narrative
On may 23, 2017 a marathon employee performing an inspection of remote valves sites on line 51 made enbridge aware that the 20" auxiliary valves (cg-51-29.63l) that connects to the 22" transmission pipeline at mp 29.63 showed evidence of crude oil seepage from the clamp ring. Enbridge regularly monitored these valves for leakage, however after notification that new seepage had been observed began visiting the valves daily to mitigate potential environmental impacts. Enbridge (the operator of the line 51 pipeline), in collaboration with marathon (the owner of the line 51 pipeline), decided to stop the seepage by injecting a sealant into the annular space between the bonnet of the valve and the clamp ring. A third party contractor was engaged and the repair strategy was planned and the injection of sealant took place in july. The auxiliary valves were monitored daily for two weeks to determine if the repair strategy was successful. As of august 8, the valves still showed evidence of seepage so another repair strategy that will be executed by marathon was determined to be necessary. The auxiliary 20" valves will be removed from the pipeline system and blind flanges will be installed in their place. New stopples will be installed at mp 29.63 to provide isolation. The nrc was notified at 17:38 cdt on august 8, 2017 (nrc#1186654) when it was determined that costs would exceed the $50,000 threshold for the new repair strategy. Approximately 1 gallon or less of crude oil had released into the valve containment area. The cause of the release has been determined to be due to thermal expansion. Shutdown and isolation was not required due to the nature and minimal volume of the leak; however, the PHMSA portal system required answers to part e, questions 5.A - 5.C. Which do not apply to this release.
| Report Received Date | 2017-08-15 00:00:00 |
|---|---|
| Iyear | 2017 |
| Report Number | 20170253 |
| Supplemental Number | 22556 |
| Report Type | Original Final |
| Operator Id | 31947 PHMSA Enforcement |
| Name | Enbridge Pipelines (Ozark) L.l.c. |
| Operator Street Address | 915 N Eldridge Parkway, Suite 1100 |
| Operator City Name | Houston |
| Operator State Abbreviation | TX |
| Operator Postal Code | 77079 |
| Local Datetime | 2017-08-08 17:25:00 |
| Location Latitude | 36.2639 Google Maps OpenStreetMap |
| Location Longitude | -96.394422 Google Maps OpenStreetMap |
| Commodity Released Type | Crude Oil |
| Unintentional Release Bbls | 0.02 |
| Recovered Bbls | 0.02 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Accident Identifier | Local Operating Personnel, Including Contractors |
| Operator Type | Operator Employee |
| Incident Identified Datetime | 2017-05-23 08:53:00 |
| System Part Involved | Onshore Pipeline, Including Valve Sites |
| On Off Shore | Onshore |
| Shutdown Due Accident Ind | No |
| Shutdown Explain | Shutdown And Isolation Was Not Required Due To The Nature And Minimal Volume |
| On Site Datetime | 2017-05-23 08:53:00 |
| Nrc Rpt Datetime | 2017-08-08 17:38:00 |
| Nrc Rpt Num | 1186654 NRC Report How to search |
| Ignite Ind | No |
| Explode Ind | No |
| Upstream Valve Type Ind | Remotely Controlled |
| Downstream Valve Type Ind | Remotely Controlled |
| Num Pub Evacuated | 0 |
| Pipe Fac Name | Line 51 |
| Segment Name | Loop Valve Cg-51-29.63l |
| Onshore State Abbreviation | Ok |
| Onshore Postal Code | 74020 |
| Onshore City Name | Cleveland |
| Onshore County Name | Pawnee |
| Designated Location | Milepost/valve Station |
| Designated Name | Mp 29.63 |
| Federal | No |
| Location Type | Pipeline Right-Of-Way |
| Incident Area Type | Aboveground |
| Incident Area Subtype | Inside Other Enclosed Space |
| Crossing | No |
| Pipe Facility Type | Interstate |
| Item Involved | Valve |
| Valve Type | Auxiliary Or Other Valve |
| Installation Year | 1948 |
| Material Involved | Carbon Steel |
| Release Type | Leak |
| Leak Type | Seal Or Packing |
| 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 | Yes |
| Commercially Nav Ind | Yes |
| Commercially Nav Yes No | Yes |
| Usa Ecological Ind | Yes |
| Usa Ecological Yes No | Yes |
| Est Cost Oper Paid | 0 |
| Est Cost Gas Released | 0 |
| Est Cost Prop Damage | 900000 |
| Est Cost Emergency | 0 |
| Est Cost Environmental | 0 |
| Est Cost Other | 0 |
| Prpty | 900000 |
| Accident Psig | 178 |
| Mop Psig | 778 |
| Accident Pressure | Pressure Did Not Exceed Mop |
| Pressure Restriction Ind | No |
| Length Segment Isolated | 125822 |
| 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 | 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 | Lack control center involvement |
| Employee Drug Test Ind | No |
| Contractor Drug Test Ind | No |
| Cause | Natural Force Damage |
| Cause Details | Temperature |
| Natural Force Type | Temperature |
| Temperature Subtype | Thermal Stress |
| Nf Extreme Weather Ind | No |
| Preparer Name | S**** S**** |
| Preparer Title | Compliance Analyst |
| Preparer Email | S**********@e*******.com |
| Preparer Telephone | 715-395-3620 |
| Preparer Fax | 715-398-4802 |
| Prepared Date | 2017-08-15 00:00:00 |
| Authorizer Name | R** C******* |
| Authorizer Telephone | 715-395-3619 |
| Authorizer Title | Supervisor Us Pipeline Compliance |
| Authorizer Email | R***********@e*******.com |
| Narrative | On may 23, 2017 a marathon employee performing an inspection of remote valves sites on line 51 made enbridge aware that the 20" auxiliary valves (cg-51-29.63l) that connects to the 22" transmission pipeline at mp 29.63 showed evidence of crude oil seepage from the clamp ring. Enbridge regularly monitored these valves for leakage, however after notification that new seepage had been observed began visiting the valves daily to mitigate potential environmental impacts. Enbridge (the operator of the line 51 pipeline), in collaboration with marathon (the owner of the line 51 pipeline), decided to stop the seepage by injecting a sealant into the annular space between the bonnet of the valve and the clamp ring. A third party contractor was engaged and the repair strategy was planned and the injection of sealant took place in july. The auxiliary valves were monitored daily for two weeks to determine if the repair strategy was successful. As of august 8, the valves still showed evidence of seepage so another repair strategy that will be executed by marathon was determined to be necessary. The auxiliary 20" valves will be removed from the pipeline system and blind flanges will be installed in their place. New stopples will be installed at mp 29.63 to provide isolation. The nrc was notified at 17:38 cdt on august 8, 2017 (nrc#1186654) when it was determined that costs would exceed the $50,000 threshold for the new repair strategy. Approximately 1 gallon or less of crude oil had released into the valve containment area. The cause of the release has been determined to be due to thermal expansion. Shutdown and isolation was not required due to the nature and minimal volume of the leak; however, the PHMSA portal system required answers to part e, questions 5.A - 5.C. Which do not apply to this release. |
External Resources
PHMSA pipeline safety insights.
Product
Features
Company
All rights reserved. Copyright © by ClearPHMSA