Incident details
Operator, cause, commodity and consequences with raw source fields.
HL incident on 2010-06-03 — TX
Operator
Conocophillips
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)
$65,262
Incident datetime
2010-06-03 19:13
Report number
Location
TX
Narrative
The mx20 pipeline ruptured releasing natural gas liquids (ngl) under pressure. The ngl vaporized upon reaching the atmospheric pressure, but did not ignite. The cause of the rupture is under investigation pending metallurgical study and ancillary pipeline activity. Cppl recieved the final report on july 9, 2010, PHMSA recieved a copy of the report on the same day. Conclusion: the failure was caused by external microbiologically influenced corrosion (mic). The wall thickness had been reduced such that the remaining ligament failed in a ductile manner at normal operating pressures. Other anomalies were found in the vicinity of the rupture, however, it was determined that none of the other features contributed to the root cause of the failure which was external corrosion of the pipe. The failure occurred where cppl's pipeline crossed a larger diameter, currently idles pipeline operated by another company. At some point and time, cppl's pipeline was recoated with tape in the vicinity of the foreign pipeline. It appeared that the tape was applied over the original coating - not direcly to the pipe surface. The tape was poorly bonded and sheilded the pipe from cathodic protection. The ground was reportably we during excavation of the failure due to a leaking water pipe in the area. The sheilding from the tape recoat in combination with the presence of groundwater promoted an enviroment conductive to microbiological activity.
Detailed record list
Report Received Date
2010-06-30 00:00:00
Iyear
2010
Report Number
20100133
Supplemental Number
18225
Report Type
Supplemental Final
Operator Id
31684
Name
Conocophillips
Operator Street Address
600 North Dairy Ashford
Operator City Name
Houston
Operator State Abbreviation
TX
Operator Postal Code
77079
Local Datetime
2010-06-03 19:13:00
Location Latitude
31.98743
Location Longitude
-102.63968
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
4618
Recovered Bbls
0
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Accident Identifier
Cpm Leak Detection System Or Scada-Based Information (Such As Alarm(S), Alert(S), Event(S), And/or Volume Calculations)
Incident Identified Datetime
2010-06-03 19:13:00
System Part Involved
Onshore Pipeline, Including Valve Sites
On Off Shore
Onshore
Shutdown Due Accident Ind
Yes
Shutdown Datetime
2010-06-03 19:13:00
Restart Datetime
2010-06-08 17:30:00
On Site Datetime
2010-06-03 20:05:00
Nrc Rpt Datetime
2010-06-03 22:16:00
Nrc Rpt Num
942753
Ignite Ind
No
Explode Ind
No
Upstream Valve Type Ind
Automatic
Downstream Valve Type Ind
Automatic
Num Pub Evacuated
0
Pipe Fac Name
Mx-20
Segment Name
Mex-Tex Line
Onshore State Abbreviation
Tx
Onshore Postal Code
79741
Onshore City Name
Goldsmith
Onshore County Name
Ector
Designated Location
Milepost/valve Station
Designated Name
17+71
Federal
No
Location Type
Pipeline Right-Of-Way
Incident Area Type
Underground
Incident Area Subtype
Under Soil
Crossing
No
Pipe Facility Type
Interstate
Item Involved
Pipe
Pipe Type
Pipe Body
Pipe Diameter
6.625
Pipe Wall Thickness
0.188
Pipe Smys
40000
Pipe Specification
Grade C
Pipe Seam Type
Erw � Unknown Frequency
Pipe Manufacturer
Republic
Pipe Coating Type
Asphalt
Installation Year
1942
Manufactured Year
1942
Material Involved
Carbon Steel
Release Type
Rupture
Rupture Orient
Longitudinal
Rupture Width
12
Rupture Length
24
Wildlife Impact Ind
No
Soil Contamination
No
Long Term Assessment
No
Remediation Ind
No
Water Contam Ind
No
Could Be Hca
No
Commodity Reached Hca
No
Est Cost Oper Paid
0
Est Cost Gas Released
199000
Est Cost Prop Damage
65262
Est Cost Emergency
40000
Est Cost Environmental
0
Est Cost Other
0
Prpty
304262
Accident Psig
947
Mop Psig
1085
Accident Pressure
Pressure Did Not Exceed Mop
Pressure Restriction Ind
No
Length Segment Isolated
184800
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
Yes
Scada Conf Ind
Yes
Cpm In Place Ind
Yes
Cpm Operating Ind
Yes
Cpm Functional Ind
Yes
Cpm Detection Ind
Yes
Cpm Conf Ind
Yes
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
During the investigation by cop and PHMSA it was determined that the control center responded quickly to the release and was not at fault.
Employee Drug Test Ind
Yes
Contractor Drug Test Ind
No
Num Employees Tested
1
Num Employees Failed
0
Cause
Corrosion Failure
Cause Details
External Corrosion
Internal External
External Corrosion
Visual Exam Results
Localized Pitting
Microbiological Corrosion Ind
Yes
Metallurgical Basis Ind
Yes
Underground Location
Yes
Under Cathodic Protection Ind
Yes
Cathodic Pro Start Year
1962
Shielding Evident
Yes
Cathodic Survey Type
Yes
Cp Annual Survey Ind
Yes
Cp Annual Survey Year
2010
Prior Damage
Yes
Collected Data Ind
Yes
Geometry Recent Year
2009
Has Hydrtst Conduc Before Ind
No
Direct Asmnt Conducted
No
Non Destructive Exam Ind
No
Preparer Name
T*** T*****
Preparer Title
Regulatory Compliance Manager
Preparer Email
T************@c*************.com
Preparer Telephone
8323796255
Preparer Fax
8323796410
Prepared Date
2013-06-25 00:00:00
Authorizer Name
T*** T*****
Authorizer Telephone
832-379-6255
Authorizer Title
Regulatory Compliance Manager
Authorizer Email
T************@c*************.com
Narrative
The mx20 pipeline ruptured releasing natural gas liquids (ngl) under pressure. The ngl vaporized upon reaching the atmospheric pressure, but did not ignite. The cause of the rupture is under investigation pending metallurgical study and ancillary pipeline activity. Cppl recieved the final report on july 9, 2010, PHMSA recieved a copy of the report on the same day. Conclusion: the failure was caused by external microbiologically influenced corrosion (mic). The wall thickness had been reduced such that the remaining ligament failed in a ductile manner at normal operating pressures. Other anomalies were found in the vicinity of the rupture, however, it was determined that none of the other features contributed to the root cause of the failure which was external corrosion of the pipe. The failure occurred where cppl's pipeline crossed a larger diameter, currently idles pipeline operated by another company. At some point and time, cppl's pipeline was recoated with tape in the vicinity of the foreign pipeline. It appeared that the tape was applied over the original coating - not direcly to the pipe surface. The tape was poorly bonded and sheilded the pipe from cathodic protection. The ground was reportably we during excavation of the failure due to a leaking water pipe in the area. The sheilding from the tape recoat in combination with the presence of groundwater promoted an enviroment conductive to microbiological activity.
| Report Received Date | 2010-06-30 00:00:00 |
|---|---|
| Iyear | 2010 |
| Report Number | 20100133 |
| Supplemental Number | 18225 |
| Report Type | Supplemental Final |
| Operator Id | 31684 PHMSA Enforcement |
| Name | Conocophillips |
| Operator Street Address | 600 North Dairy Ashford |
| Operator City Name | Houston |
| Operator State Abbreviation | TX |
| Operator Postal Code | 77079 |
| Local Datetime | 2010-06-03 19:13:00 |
| Location Latitude | 31.98743 Google Maps OpenStreetMap |
| Location Longitude | -102.63968 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 | 4618 |
| Recovered Bbls | 0 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Accident Identifier | Cpm Leak Detection System Or Scada-Based Information (Such As Alarm(S), Alert(S), Event(S), And/or Volume Calculations) |
| Incident Identified Datetime | 2010-06-03 19:13:00 |
| System Part Involved | Onshore Pipeline, Including Valve Sites |
| On Off Shore | Onshore |
| Shutdown Due Accident Ind | Yes |
| Shutdown Datetime | 2010-06-03 19:13:00 |
| Restart Datetime | 2010-06-08 17:30:00 |
| On Site Datetime | 2010-06-03 20:05:00 |
| Nrc Rpt Datetime | 2010-06-03 22:16:00 |
| Nrc Rpt Num | 942753 NRC Report How to search |
| Ignite Ind | No |
| Explode Ind | No |
| Upstream Valve Type Ind | Automatic |
| Downstream Valve Type Ind | Automatic |
| Num Pub Evacuated | 0 |
| Pipe Fac Name | Mx-20 |
| Segment Name | Mex-Tex Line |
| Onshore State Abbreviation | Tx |
| Onshore Postal Code | 79741 |
| Onshore City Name | Goldsmith |
| Onshore County Name | Ector |
| Designated Location | Milepost/valve Station |
| Designated Name | 17+71 |
| Federal | No |
| Location Type | Pipeline Right-Of-Way |
| Incident Area Type | Underground |
| Incident Area Subtype | Under Soil |
| Crossing | No |
| Pipe Facility Type | Interstate |
| Item Involved | Pipe |
| Pipe Type | Pipe Body |
| Pipe Diameter | 6.625 |
| Pipe Wall Thickness | 0.188 |
| Pipe Smys | 40000 |
| Pipe Specification | Grade C |
| Pipe Seam Type | Erw � Unknown Frequency |
| Pipe Manufacturer | Republic |
| Pipe Coating Type | Asphalt |
| Installation Year | 1942 |
| Manufactured Year | 1942 |
| Material Involved | Carbon Steel |
| Release Type | Rupture |
| Rupture Orient | Longitudinal |
| Rupture Width | 12 |
| Rupture Length | 24 |
| Wildlife Impact Ind | No |
| Soil Contamination | No |
| Long Term Assessment | No |
| Remediation Ind | No |
| Water Contam Ind | No |
| Could Be Hca | No |
| Commodity Reached Hca | No |
| Est Cost Oper Paid | 0 |
| Est Cost Gas Released | 199000 |
| Est Cost Prop Damage | 65262 |
| Est Cost Emergency | 40000 |
| Est Cost Environmental | 0 |
| Est Cost Other | 0 |
| Prpty | 304262 |
| Accident Psig | 947 |
| Mop Psig | 1085 |
| Accident Pressure | Pressure Did Not Exceed Mop |
| Pressure Restriction Ind | No |
| Length Segment Isolated | 184800 |
| 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 | Yes |
| Scada Conf Ind | Yes |
| Cpm In Place Ind | Yes |
| Cpm Operating Ind | Yes |
| Cpm Functional Ind | Yes |
| Cpm Detection Ind | Yes |
| Cpm Conf Ind | Yes |
| 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 | During the investigation by cop and PHMSA it was determined that the control center responded quickly to the release and was not at fault. |
| Employee Drug Test Ind | Yes |
| Contractor Drug Test Ind | No |
| Num Employees Tested | 1 |
| Num Employees Failed | 0 |
| Cause | Corrosion Failure |
| Cause Details | External Corrosion |
| Internal External | External Corrosion |
| Visual Exam Results | Localized Pitting |
| Microbiological Corrosion Ind | Yes |
| Metallurgical Basis Ind | Yes |
| Underground Location | Yes |
| Under Cathodic Protection Ind | Yes |
| Cathodic Pro Start Year | 1962 |
| Shielding Evident | Yes |
| Cathodic Survey Type | Yes |
| Cp Annual Survey Ind | Yes |
| Cp Annual Survey Year | 2010 |
| Prior Damage | Yes |
| Collected Data Ind | Yes |
| Geometry Recent Year | 2009 |
| Has Hydrtst Conduc Before Ind | No |
| Direct Asmnt Conducted | No |
| Non Destructive Exam Ind | No |
| Preparer Name | T*** T***** |
| Preparer Title | Regulatory Compliance Manager |
| Preparer Email | T************@c*************.com |
| Preparer Telephone | 8323796255 |
| Preparer Fax | 8323796410 |
| Prepared Date | 2013-06-25 00:00:00 |
| Authorizer Name | T*** T***** |
| Authorizer Telephone | 832-379-6255 |
| Authorizer Title | Regulatory Compliance Manager |
| Authorizer Email | T************@c*************.com |
| Narrative | The mx20 pipeline ruptured releasing natural gas liquids (ngl) under pressure. The ngl vaporized upon reaching the atmospheric pressure, but did not ignite. The cause of the rupture is under investigation pending metallurgical study and ancillary pipeline activity. Cppl recieved the final report on july 9, 2010, PHMSA recieved a copy of the report on the same day. Conclusion: the failure was caused by external microbiologically influenced corrosion (mic). The wall thickness had been reduced such that the remaining ligament failed in a ductile manner at normal operating pressures. Other anomalies were found in the vicinity of the rupture, however, it was determined that none of the other features contributed to the root cause of the failure which was external corrosion of the pipe. The failure occurred where cppl's pipeline crossed a larger diameter, currently idles pipeline operated by another company. At some point and time, cppl's pipeline was recoated with tape in the vicinity of the foreign pipeline. It appeared that the tape was applied over the original coating - not direcly to the pipe surface. The tape was poorly bonded and sheilded the pipe from cathodic protection. The ground was reportably we during excavation of the failure due to a leaking water pipe in the area. The sheilding from the tape recoat in combination with the presence of groundwater promoted an enviroment conductive to microbiological activity. |
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