Incident details
Operator, cause, commodity and consequences with raw source fields.
HL incident on 2016-08-03 — OH
Operator
Marathon Pipe Line Llc
Cause
Corrosion Failure
Commodity
Hvl Or Other Flammable Or Toxic Fluid Which Is A Gas At Ambient Conditions
Program
HL
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$412,690
Incident datetime
2016-08-03 15:24
Report number
Location
OH
Narrative
On august 1, a marathon pipe line contracted pilot observed bubbling in the lower san jacinto bay. The responsible party was unknown, the release was impacting water, and mpl made a courtesy report to the nrc (report #1155009) and to the texas railroad commission. Mpl continued to work with other operators and regulatory agencies in the area until august 3, when divers confirmed the release to be coming from mpl's pipeline. A second nrc report (#1155262) was made in order to claim responsibility for the release, however a volume estimate was not available at the time. A temporary repair clamp was successfully installed on august 5 and the release was stopped. A third nrc report (#1155462) was made in order to provide a volume. Mpl completed its investigation and determined that the failure of the pipeline was the result of ac induced corrosion on the pipe. At the time the pipeline was first laid, it was laid concurrently with an adjacent third-party 6" pipeline and was collocated with multiple hvac overhead power lines. The mpl pipeline and the third-party pipeline were tied together with bolted brackets which remained on the pipes as permanent appurtenances. The presence of brackets on the line appeared to have damaged the pipe coating and provided a low-resistance path for ac current discharge, resulting in localized corrosion concentrated in the bracketed area. The segment of the pipe containing the leak was cut out and permanently repaired by installing new pipe. Anode sleds were installed to mitigate future ac induced corrosion. 2/21/17: part d.6. Was updated with final costs. The time of shutdown in part a.14.A was revised slightly. 6/16/17 update: part a, questions 4 and 7: times were revised. Part c, question 3a: the nominal diameter of pipe was changed to 8 inches. Part g, question 2: the type of corrosion was updated from "other" to "stray current". To clarify, the stray current was alternating current (ac) induced and not relating to cathodic protection.
Detailed record list
Report Received Date
2016-08-31 00:00:00
Iyear
2016
Report Number
20160270
Supplemental Number
22425
Report Type
Supplemental Final
Operator Id
32147
Name
Marathon Pipe Line Llc
Operator Street Address
539 South Main Street
Operator City Name
Findlay
Operator State Abbreviation
OH
Operator Postal Code
45840
Local Datetime
2016-08-01 09:10:00
Location Latitude
29.69438
Location Longitude
-95.024946
Commodity Released Type
Hvl Or Other Flammable Or Toxic Fluid Which Is A Gas At Ambient Conditions
Commodity Subtype
Lpg (Liquefied Petroleum Gas) / Ngl (Natural Gas Liquid)
Unintentional Release Bbls
4.87
Intentional Release Bbls
0
Recovered Bbls
0
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Accident Identifier
Air Patrol
Operator Type
Contractor Working For The Operator
Incident Identified Datetime
2016-08-03 15:24:00
System Part Involved
Onshore Pipeline, Including Valve Sites
On Off Shore
Onshore
Shutdown Due Accident Ind
Yes
Shutdown Datetime
2016-08-03 08:36:00
Restart Datetime
2016-08-05 20:15:00
On Site Datetime
2016-08-03 09:30:00
Nrc Rpt Datetime
2016-08-01 11:28:00
Nrc Rpt Num
1155262
Ignite Ind
No
Explode Ind
No
Upstream Valve Type Ind
Manual
Downstream Valve Type Ind
Manual
Num Pub Evacuated
0
Pipe Fac Name
Mont Belvieu To Galveston Bay Refinery 8" Butane
Segment Name
Mont Belvieu Fm 1942 Junction - Gbr 8"
Onshore State Abbreviation
Tx
Onshore Postal Code
77571
Onshore City Name
La Porte
Onshore County Name
Harris
Designated Location
Milepost/valve Station
Designated Name
2281+02
Federal
No
Location Type
Pipeline Right-Of-Way
Incident Area Type
Underground
Incident Area Subtype
Other
Incident Area Details
Buried Under The Lower San Jacinto Bay
Depth Of Cover
48
Crossing
Yes
Water Crossing Ind
Yes
Water Type
Uncased
Water Name
Lower San Jacinto Bay
Water Depth
4
Water Subtype
Below Water, Pipe Buried Below Bottom (Not In Bored/drilled Crossing)
Pipe Facility Type
Intrastate
Item Involved
Pipe
Pipe Type
Pipe Body
Pipe Diameter
8
Pipe Wall Thickness
0.358
Pipe Smys
52000
Pipe Specification
Api 5lx
Pipe Seam Type
Erw - High Frequency
Pipe Manufacturer
Unknown
Pipe Coating Type
Fusion Bonded Epoxy(Fbe)
Installation Year
1979
Manufactured Year
1979
Material Involved
Carbon Steel
Release Type
Leak
Leak Type
Pinhole
Wildlife Impact Ind
No
Soil Contamination
No
Long Term Assessment
No
Remediation Ind
No
Water Contam Ind
Yes
Surface Contam Ind
Yes
Amount Released
4.87
Rel Water Name
Lower San Jacinto Bay
Could Be Hca
Yes
Commodity Reached Hca
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
133
Est Cost Prop Damage
412690
Est Cost Emergency
81683
Est Cost Environmental
0
Est Cost Other
0
Prpty
494506
Accident Psig
496
Mop Psig
1503
Accident Pressure
Pressure Did Not Exceed Mop
Pressure Restriction Ind
No
Length Segment Isolated
30395
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
Yes, specify investigation result(s): (select all that apply)
Invest Schedule Ind
Yes
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
External Corrosion
Internal External
External Corrosion
Visual Exam Results
Localized Pitting
Stray Current Corrosion Ind
Yes
Field Exam Basis Ind
Yes
Underground Location
Yes
Under Cathodic Protection Ind
Yes
Cathodic Pro Start Year
1979
Shielding Evident
No
Cathodic Survey Type
Yes
Cp Annual Survey Ind
Yes
Close Interval Survey Ind
Yes
Cp Annual Survey Year
2016
Close Interval Survey Year
2015
Prior Damage
Yes
Collected Data Ind
Yes
Axial Magnetic Flx Lkg Ind
Yes
Ultrasonic Ind
Yes
Geometry Deformation Ind
Yes
Axial Recent Year
2009
Ultrasonic Recent Year
2012
Geometry Recent Year
2012
Has Hydrtst Conduc Before Ind
Yes
Hydrtst Most Rcnt Year
2008
Hydrtst Most Rcnt Pressure
1879
Direct Asmnt Conducted
No
Non Destructive Exam Ind
No
Preparer Name
T****** J* H******
Preparer Title
Hes Professional
Preparer Email
T********@m****************.com
Preparer Telephone
419-421-2121
Prepared Date
2017-06-16 00:00:00
Authorizer Name
R****** W* B*****
Authorizer Telephone
419-421-2121
Authorizer Title
Regulatory And Compliance Supervisor
Authorizer Email
R*******@m****************.com
Narrative
On august 1, a marathon pipe line contracted pilot observed bubbling in the lower san jacinto bay. The responsible party was unknown, the release was impacting water, and mpl made a courtesy report to the nrc (report #1155009) and to the texas railroad commission. Mpl continued to work with other operators and regulatory agencies in the area until august 3, when divers confirmed the release to be coming from mpl's pipeline. A second nrc report (#1155262) was made in order to claim responsibility for the release, however a volume estimate was not available at the time. A temporary repair clamp was successfully installed on august 5 and the release was stopped. A third nrc report (#1155462) was made in order to provide a volume. Mpl completed its investigation and determined that the failure of the pipeline was the result of ac induced corrosion on the pipe. At the time the pipeline was first laid, it was laid concurrently with an adjacent third-party 6" pipeline and was collocated with multiple hvac overhead power lines. The mpl pipeline and the third-party pipeline were tied together with bolted brackets which remained on the pipes as permanent appurtenances. The presence of brackets on the line appeared to have damaged the pipe coating and provided a low-resistance path for ac current discharge, resulting in localized corrosion concentrated in the bracketed area. The segment of the pipe containing the leak was cut out and permanently repaired by installing new pipe. Anode sleds were installed to mitigate future ac induced corrosion. 2/21/17: part d.6. Was updated with final costs. The time of shutdown in part a.14.A was revised slightly. 6/16/17 update: part a, questions 4 and 7: times were revised. Part c, question 3a: the nominal diameter of pipe was changed to 8 inches. Part g, question 2: the type of corrosion was updated from "other" to "stray current". To clarify, the stray current was alternating current (ac) induced and not relating to cathodic protection.
| Report Received Date | 2016-08-31 00:00:00 |
|---|---|
| Iyear | 2016 |
| Report Number | 20160270 |
| Supplemental Number | 22425 |
| Report Type | Supplemental Final |
| Operator Id | 32147 PHMSA Enforcement |
| Name | Marathon Pipe Line Llc |
| Operator Street Address | 539 South Main Street |
| Operator City Name | Findlay |
| Operator State Abbreviation | OH |
| Operator Postal Code | 45840 |
| Local Datetime | 2016-08-01 09:10:00 |
| Location Latitude | 29.69438 Google Maps OpenStreetMap |
| Location Longitude | -95.024946 Google Maps OpenStreetMap |
| Commodity Released Type | Hvl Or Other Flammable Or Toxic Fluid Which Is A Gas At Ambient Conditions |
| Commodity Subtype | Lpg (Liquefied Petroleum Gas) / Ngl (Natural Gas Liquid) |
| Unintentional Release Bbls | 4.87 |
| Intentional Release Bbls | 0 |
| Recovered Bbls | 0 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Accident Identifier | Air Patrol |
| Operator Type | Contractor Working For The Operator |
| Incident Identified Datetime | 2016-08-03 15:24:00 |
| System Part Involved | Onshore Pipeline, Including Valve Sites |
| On Off Shore | Onshore |
| Shutdown Due Accident Ind | Yes |
| Shutdown Datetime | 2016-08-03 08:36:00 |
| Restart Datetime | 2016-08-05 20:15:00 |
| On Site Datetime | 2016-08-03 09:30:00 |
| Nrc Rpt Datetime | 2016-08-01 11:28:00 |
| Nrc Rpt Num | 1155262 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 | Mont Belvieu To Galveston Bay Refinery 8" Butane |
| Segment Name | Mont Belvieu Fm 1942 Junction - Gbr 8" |
| Onshore State Abbreviation | Tx |
| Onshore Postal Code | 77571 |
| Onshore City Name | La Porte |
| Onshore County Name | Harris |
| Designated Location | Milepost/valve Station |
| Designated Name | 2281+02 |
| Federal | No |
| Location Type | Pipeline Right-Of-Way |
| Incident Area Type | Underground |
| Incident Area Subtype | Other |
| Incident Area Details | Buried Under The Lower San Jacinto Bay |
| Depth Of Cover | 48 |
| Crossing | Yes |
| Water Crossing Ind | Yes |
| Water Type | Uncased |
| Water Name | Lower San Jacinto Bay |
| Water Depth | 4 |
| Water Subtype | Below Water, Pipe Buried Below Bottom (Not In Bored/drilled Crossing) |
| Pipe Facility Type | Intrastate |
| Item Involved | Pipe |
| Pipe Type | Pipe Body |
| Pipe Diameter | 8 |
| Pipe Wall Thickness | 0.358 |
| Pipe Smys | 52000 |
| Pipe Specification | Api 5lx |
| Pipe Seam Type | Erw - High Frequency |
| Pipe Manufacturer | Unknown |
| Pipe Coating Type | Fusion Bonded Epoxy(Fbe) |
| Installation Year | 1979 |
| Manufactured Year | 1979 |
| Material Involved | Carbon Steel |
| Release Type | Leak |
| Leak Type | Pinhole |
| Wildlife Impact Ind | No |
| Soil Contamination | No |
| Long Term Assessment | No |
| Remediation Ind | No |
| Water Contam Ind | Yes |
| Surface Contam Ind | Yes |
| Amount Released | 4.87 |
| Rel Water Name | Lower San Jacinto Bay |
| Could Be Hca | Yes |
| Commodity Reached Hca | 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 | 133 |
| Est Cost Prop Damage | 412690 |
| Est Cost Emergency | 81683 |
| Est Cost Environmental | 0 |
| Est Cost Other | 0 |
| Prpty | 494506 |
| Accident Psig | 496 |
| Mop Psig | 1503 |
| Accident Pressure | Pressure Did Not Exceed Mop |
| Pressure Restriction Ind | No |
| Length Segment Isolated | 30395 |
| 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 | Yes, specify investigation result(s): (select all that apply) |
| Invest Schedule Ind | Yes |
| 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 | External Corrosion |
| Internal External | External Corrosion |
| Visual Exam Results | Localized Pitting |
| Stray Current Corrosion Ind | Yes |
| Field Exam Basis Ind | Yes |
| Underground Location | Yes |
| Under Cathodic Protection Ind | Yes |
| Cathodic Pro Start Year | 1979 |
| Shielding Evident | No |
| Cathodic Survey Type | Yes |
| Cp Annual Survey Ind | Yes |
| Close Interval Survey Ind | Yes |
| Cp Annual Survey Year | 2016 |
| Close Interval Survey Year | 2015 |
| Prior Damage | Yes |
| Collected Data Ind | Yes |
| Axial Magnetic Flx Lkg Ind | Yes |
| Ultrasonic Ind | Yes |
| Geometry Deformation Ind | Yes |
| Axial Recent Year | 2009 |
| Ultrasonic Recent Year | 2012 |
| Geometry Recent Year | 2012 |
| Has Hydrtst Conduc Before Ind | Yes |
| Hydrtst Most Rcnt Year | 2008 |
| Hydrtst Most Rcnt Pressure | 1879 |
| Direct Asmnt Conducted | No |
| Non Destructive Exam Ind | No |
| Preparer Name | T****** J* H****** |
| Preparer Title | Hes Professional |
| Preparer Email | T********@m****************.com |
| Preparer Telephone | 419-421-2121 |
| Prepared Date | 2017-06-16 00:00:00 |
| Authorizer Name | R****** W* B***** |
| Authorizer Telephone | 419-421-2121 |
| Authorizer Title | Regulatory And Compliance Supervisor |
| Authorizer Email | R*******@m****************.com |
| Narrative | On august 1, a marathon pipe line contracted pilot observed bubbling in the lower san jacinto bay. The responsible party was unknown, the release was impacting water, and mpl made a courtesy report to the nrc (report #1155009) and to the texas railroad commission. Mpl continued to work with other operators and regulatory agencies in the area until august 3, when divers confirmed the release to be coming from mpl's pipeline. A second nrc report (#1155262) was made in order to claim responsibility for the release, however a volume estimate was not available at the time. A temporary repair clamp was successfully installed on august 5 and the release was stopped. A third nrc report (#1155462) was made in order to provide a volume. Mpl completed its investigation and determined that the failure of the pipeline was the result of ac induced corrosion on the pipe. At the time the pipeline was first laid, it was laid concurrently with an adjacent third-party 6" pipeline and was collocated with multiple hvac overhead power lines. The mpl pipeline and the third-party pipeline were tied together with bolted brackets which remained on the pipes as permanent appurtenances. The presence of brackets on the line appeared to have damaged the pipe coating and provided a low-resistance path for ac current discharge, resulting in localized corrosion concentrated in the bracketed area. The segment of the pipe containing the leak was cut out and permanently repaired by installing new pipe. Anode sleds were installed to mitigate future ac induced corrosion. 2/21/17: part d.6. Was updated with final costs. The time of shutdown in part a.14.A was revised slightly. 6/16/17 update: part a, questions 4 and 7: times were revised. Part c, question 3a: the nominal diameter of pipe was changed to 8 inches. Part g, question 2: the type of corrosion was updated from "other" to "stray current". To clarify, the stray current was alternating current (ac) induced and not relating to cathodic protection. |
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