Incident details
Operator, cause, commodity and consequences with raw source fields.
GTG incident on 2020-09-11 — TX
Operator
Enbridge Offshore (Gas Gathering) L.l.c.
Cause
Corrosion Failure
Commodity
Natural Gas
Program
GTG
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$111,000
Incident datetime
2020-09-11 13:00
Report number
Location
TX
Narrative
At approximately 1:00 pm. Cdt on september 11, 2020, enbridge offshore gas gathering l.L.C.'s (enbridge offshore) discovered a leak on a 2-inch diameter by-pass line on a platform (smi 76) located on sm 76p in the gulf of mexico. Enbridge offshore subsequently depressurized the line after attempting to isolate the pipeline and stop the leak. Enbridge offshore notified the nrc at 3:55 cdt after making attempts to isolate the line and stop the leak. The pipeline remains out of service at this time due to hurricane laura and hurricane delta. The preliminary direct cause of the leak is atmospheric corrosion. Updated 4-8-2021 garden banks, smi-76 experienced a pinhole leak on a 2-inch bypass line located upstream of the 30-inch at a platform shutdown valve. The 2-inch pipe was covered with a composite reinforcement wrap. After removing the composite reinforcement wrap it was determined that the leak was the result of an external corrosion pin hole beneath the composite reinforcement wrap. The line has been replaced and recoated.
Detailed record list
Report Received Date
2020-10-08 00:00:00
Iyear
2020
Report Number
20200104
Supplemental Number
35153
Report Type
Supplemental Final
Operator Id
31485
Name
Enbridge Offshore (Gas Gathering) L.l.c.
Operator Street Address
915 North Eldridge Parkway
Operator City Name
Houston
Operator State Abbreviation
TX
Operator Postal Code
77079
Local Datetime
2020-09-11 13:00:00
Time Zone
Central
Daylight Savings Ind
Yes
Location Latitude
28.57352778
Location Longitude
-91.95944444
Nrc Rpt Num
1287127
Nrc Rpt Datetime
2020-09-11 15:55:00
Additional Nrc Report Numbers
1287227
Commodity Released Type
Natural Gas
Unintentional Release
65
Intentional Release
48181
Accompanying Liquid
0
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Status When Identified
Routine Start-Up
Shutdown Due Accident Ind
No
Shutdown Explain
The Platform Was Shut-In Due To Hurricane Laura
Communication State Fed Ind
No
Ignite Ind
No
Num Pub Evacuated
0
Incident Identified Datetime
2020-09-11 13:00:00
On Site Datetime
2020-09-11 13:00:00
On Off Shore
Offshore
Pipe Fac Name
Enbridge Offshore Gas Gathering, L.l.c.
Segment Name
Phmsa Opid #: 31485
Off Water Depth
140
Off Accident Origin
On The Outer Continental Shelf (Ocs)
Ocs Type
Ocs-Gulf Of Mexico
Off Ocs Area
Sm
Off Ocs Block
76p
Off Area Accident Type
Platform
Pipe Facility Type
Interstate
System Part Involved
Offshore Platform, Including Platform-Mounted Equipment And Piping
Item Involved
Pipe
Pipe Type
Pipe Body
Pipe Diameter
2
Puddle Weld Ind
No
Pipe Wall Thickness
0.218
Pipe Smys
35000
Pipe Specification
Unknown
Pipe Seam Type
Seamless
Pipe Manufacturer
Unknown
Pipe Coating Type
Paint
Coating Applied Ind
Yes
Installation Year
1997
Manufactured Year
Unknown
Material Involved
Carbon Steel
Release Type
Leak
Leak Type
Pinhole
Class Location Type
Class 1 Location
Could Be Hca
No
Pir Radius
73
Heat Damage Ind
No
Non Heat Damage Ind
No
Est Cost Oper Paid
0
Est Cost Unintentional Release
153
Est Cost Intentional Release
113240
Est Cost Prop Damage
111000
Est Cost Emergency
0
Est Cost Other
0
Est Cost Other Details
Cost Of $83,000 For Contractors, $28,000 For Boat Service.
Gas Cost In Mcf
2.3503
Prpty
224393
Num Persons Hosp Not Ovnght
0
Num Injured Treated By Emt
0
Num Resident Building Affctd
0
Num Business Building Affctd
0
Wildlife Impact Ind
No
Accident Psig
788
Gas Flow In Pipe In Mcf
0
Mop Psig
1975
Mop Cfr Section
192.619(A)(2)
Maop Established Date
1997-02-17 00:00:00
Maop Reversal Flow Ind
No
Accident Pressure
Pressure Did Not Exceed Maop
Pressure Restriction Ind
No
Gas Required Odorized Ind
No
Pipeline Function
Transmission System
Scada In Place Ind
Yes
Scada Operating Ind
Yes
Scada Functional Ind
Yes
Scada Detection Ind
No
Scada Conf Ind
No
Accident Identifier
Local Operating Personnel, Including Contractors
Operator Type
Operator Employee
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
It was determined the controllers actions did not contribute to the incident. The leak was too small to be identified by the control room personnel.
Employee Drug Test Ind
No
Contractor Drug Test Ind
No
Cause
Corrosion Failure
Cause Details
External Corrosion
Internal External
External Corrosion
Visual Exam Results
General Corrosion
Atmosphere Corrosion Ind
Yes
Field Exam Basis Ind
Yes
Underground Location
No
Externally Coated
Yes
Prior Damage
No
Collected Data Ind
No
Has Hydrtst Conduc Before Ind
No
Direct Asmnt Conducted
No
Non Destructive Exam Ind
No
Extrnl Cor Atmospheric Ind
Yes
Preparer Name
M****** M******
Preparer Title
Engineer Specialist Operational Compliance
Preparer Email
M**************@e*******.com
Preparer Telephone
612-805-6542
Authorizer Name
N***** A****
Authorizer Title
Manager - Operational Compliance
Authorizer Telephone
713-627-5008
Authorizer Email
N***********@e*******.com
Narrative
At approximately 1:00 pm. Cdt on september 11, 2020, enbridge offshore gas gathering l.L.C.'s (enbridge offshore) discovered a leak on a 2-inch diameter by-pass line on a platform (smi 76) located on sm 76p in the gulf of mexico. Enbridge offshore subsequently depressurized the line after attempting to isolate the pipeline and stop the leak. Enbridge offshore notified the nrc at 3:55 cdt after making attempts to isolate the line and stop the leak. The pipeline remains out of service at this time due to hurricane laura and hurricane delta. The preliminary direct cause of the leak is atmospheric corrosion. Updated 4-8-2021 garden banks, smi-76 experienced a pinhole leak on a 2-inch bypass line located upstream of the 30-inch at a platform shutdown valve. The 2-inch pipe was covered with a composite reinforcement wrap. After removing the composite reinforcement wrap it was determined that the leak was the result of an external corrosion pin hole beneath the composite reinforcement wrap. The line has been replaced and recoated.
| Report Received Date | 2020-10-08 00:00:00 |
|---|---|
| Iyear | 2020 |
| Report Number | 20200104 |
| Supplemental Number | 35153 |
| Report Type | Supplemental Final |
| Operator Id | 31485 PHMSA Enforcement |
| Name | Enbridge Offshore (Gas Gathering) L.l.c. |
| Operator Street Address | 915 North Eldridge Parkway |
| Operator City Name | Houston |
| Operator State Abbreviation | TX |
| Operator Postal Code | 77079 |
| Local Datetime | 2020-09-11 13:00:00 |
| Time Zone | Central |
| Daylight Savings Ind | Yes |
| Location Latitude | 28.57352778 Google Maps OpenStreetMap |
| Location Longitude | -91.95944444 Google Maps OpenStreetMap |
| Nrc Rpt Num | 1287127 NRC Report How to search |
| Nrc Rpt Datetime | 2020-09-11 15:55:00 |
| Additional Nrc Report Numbers | 1287227 |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 65 |
| Intentional Release | 48181 |
| Accompanying Liquid | 0 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Status When Identified | Routine Start-Up |
| Shutdown Due Accident Ind | No |
| Shutdown Explain | The Platform Was Shut-In Due To Hurricane Laura |
| Communication State Fed Ind | No |
| Ignite Ind | No |
| Num Pub Evacuated | 0 |
| Incident Identified Datetime | 2020-09-11 13:00:00 |
| On Site Datetime | 2020-09-11 13:00:00 |
| On Off Shore | Offshore |
| Pipe Fac Name | Enbridge Offshore Gas Gathering, L.l.c. |
| Segment Name | Phmsa Opid #: 31485 |
| Off Water Depth | 140 |
| Off Accident Origin | On The Outer Continental Shelf (Ocs) |
| Ocs Type | Ocs-Gulf Of Mexico |
| Off Ocs Area | Sm |
| Off Ocs Block | 76p |
| Off Area Accident Type | Platform |
| Pipe Facility Type | Interstate |
| System Part Involved | Offshore Platform, Including Platform-Mounted Equipment And Piping |
| Item Involved | Pipe |
| Pipe Type | Pipe Body |
| Pipe Diameter | 2 |
| Puddle Weld Ind | No |
| Pipe Wall Thickness | 0.218 |
| Pipe Smys | 35000 |
| Pipe Specification | Unknown |
| Pipe Seam Type | Seamless |
| Pipe Manufacturer | Unknown |
| Pipe Coating Type | Paint |
| Coating Applied Ind | Yes |
| Installation Year | 1997 |
| Manufactured Year | Unknown |
| Material Involved | Carbon Steel |
| Release Type | Leak |
| Leak Type | Pinhole |
| Class Location Type | Class 1 Location |
| Could Be Hca | No |
| Pir Radius | 73 |
| Heat Damage Ind | No |
| Non Heat Damage Ind | No |
| Est Cost Oper Paid | 0 |
| Est Cost Unintentional Release | 153 |
| Est Cost Intentional Release | 113240 |
| Est Cost Prop Damage | 111000 |
| Est Cost Emergency | 0 |
| Est Cost Other | 0 |
| Est Cost Other Details | Cost Of $83,000 For Contractors, $28,000 For Boat Service. |
| Gas Cost In Mcf | 2.3503 |
| Prpty | 224393 |
| Num Persons Hosp Not Ovnght | 0 |
| Num Injured Treated By Emt | 0 |
| Num Resident Building Affctd | 0 |
| Num Business Building Affctd | 0 |
| Wildlife Impact Ind | No |
| Accident Psig | 788 |
| Gas Flow In Pipe In Mcf | 0 |
| Mop Psig | 1975 |
| Mop Cfr Section | 192.619(A)(2) View CFR 49 §192 |
| Maop Established Date | 1997-02-17 00:00:00 |
| Maop Reversal Flow Ind | No |
| Accident Pressure | Pressure Did Not Exceed Maop |
| Pressure Restriction Ind | No |
| Gas Required Odorized Ind | No |
| Pipeline Function | Transmission System |
| Scada In Place Ind | Yes |
| Scada Operating Ind | Yes |
| Scada Functional Ind | Yes |
| Scada Detection Ind | No |
| Scada Conf Ind | No |
| Accident Identifier | Local Operating Personnel, Including Contractors |
| Operator Type | Operator Employee |
| 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 | It was determined the controllers actions did not contribute to the incident. The leak was too small to be identified by the control room personnel. |
| Employee Drug Test Ind | No |
| Contractor Drug Test Ind | No |
| Cause | Corrosion Failure |
| Cause Details | External Corrosion |
| Internal External | External Corrosion |
| Visual Exam Results | General Corrosion |
| Atmosphere Corrosion Ind | Yes |
| Field Exam Basis Ind | Yes |
| Underground Location | No |
| Externally Coated | Yes |
| Prior Damage | No |
| Collected Data Ind | No |
| Has Hydrtst Conduc Before Ind | No |
| Direct Asmnt Conducted | No |
| Non Destructive Exam Ind | No |
| Extrnl Cor Atmospheric Ind | Yes |
| Preparer Name | M****** M****** |
| Preparer Title | Engineer Specialist Operational Compliance |
| Preparer Email | M**************@e*******.com |
| Preparer Telephone | 612-805-6542 |
| Authorizer Name | N***** A**** |
| Authorizer Title | Manager - Operational Compliance |
| Authorizer Telephone | 713-627-5008 |
| Authorizer Email | N***********@e*******.com |
| Narrative | At approximately 1:00 pm. Cdt on september 11, 2020, enbridge offshore gas gathering l.L.C.'s (enbridge offshore) discovered a leak on a 2-inch diameter by-pass line on a platform (smi 76) located on sm 76p in the gulf of mexico. Enbridge offshore subsequently depressurized the line after attempting to isolate the pipeline and stop the leak. Enbridge offshore notified the nrc at 3:55 cdt after making attempts to isolate the line and stop the leak. The pipeline remains out of service at this time due to hurricane laura and hurricane delta. The preliminary direct cause of the leak is atmospheric corrosion. Updated 4-8-2021 garden banks, smi-76 experienced a pinhole leak on a 2-inch bypass line located upstream of the 30-inch at a platform shutdown valve. The 2-inch pipe was covered with a composite reinforcement wrap. After removing the composite reinforcement wrap it was determined that the leak was the result of an external corrosion pin hole beneath the composite reinforcement wrap. The line has been replaced and recoated. |
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