Incident details
Operator, cause, commodity and consequences with raw source fields.
HL incident on 2021-11-30 — AK
Operator
Hilcorp North Slope, Llc
Cause
Corrosion Failure
Commodity
Crude Oil
Program
HL
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$150,000
Incident datetime
2021-11-30 04:05
Report number
Location
AK
Narrative
A pipeline operator found a pinhole leak in the ot-12 pipeline during routine operations and maintenance activities and shut-in the pipeline at 4:22 am on november 30, 2021. Notice to nrc was made at 5:13 am. The pinhole leak was located on aboveground pig receiver inlet piping located in module 4913 at greater prudhoe bay - flow station 1. The pinhole leak was at 6 o'clock on a 90-degree, 3-d bend that is constructed of .500-inch, x60 pipe, with a 12-inch nominal diameter. Due to the leak, controllers shut down and depressurized the pipeline. Once safe to do so, operators applied a temporary repair per manufacturers instructions. The pipeline was restarted at 4:50 am on december 1. A permanent repair is under design and will be executed as soon as winter freeze conditions diminish. The estimated leak time was less than one hour, during which 70-gallons of crude oil leaked into module 4913. The module contained the crude oil with the exception of a small quantity that became trapped in an insulation soffit. The small quantity of crude oil that was trapped in the insulation soffit dripped to the gravel pad below the module. Twenty-five yards of potentially contaminated gravel was removed from the pad for remediation.
Detailed record list
Report Received Date
2021-12-21 00:00:00
Iyear
2021
Report Number
20210350
Supplemental Number
36317
Report Type
Supplemental Final
Operator Id
1541
Name
Hilcorp North Slope, Llc
Operator Street Address
3800 Centerpoint Drive Suite 1400
Operator City Name
Anchorage
Operator State Abbreviation
AK
Operator Postal Code
99503
Local Datetime
2021-11-30 04:22:00
Time Zone
Alaska
Daylight Savings Ind
Yes
Location Latitude
70.25722
Location Longitude
-148.4358
Commodity Released Type
Crude Oil
Unintentional Release Bbls
1.6
Recovered Bbls
1.5
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Accident Identifier
Ground Patrol By Operator Or Its Contractor
Operator Type
Operator Employee
Incident Identified Datetime
2021-11-30 04:05:00
System Part Involved
Onshore Pipeline, Including Valve Sites
On Off Shore
Onshore
Status When Identified
Normal Operation, Includes Pauses Between Batches And During Maintenance
Shutdown Due Accident Ind
Yes
Shutdown Datetime
2021-11-30 04:22:00
Restart Datetime
2021-12-01 04:50:00
Communication State Fed Ind
No
On Site Datetime
2021-11-30 04:05:00
Confirmed Discovery Datetime
2021-11-30 04:22:00
Nrc Rpt Datetime
2021-11-30 05:13:00
Nrc Rpt Num
1323189
Additional Nrc Report Numbers
1323265
Ignite Ind
No
Upstream Action Taken
Operational Control
Upstream Oprtnl Cntrl Detail
Crude Oil At Production Facility Was Diverted To Production Slop Tank.
Downstream Action Taken
Valve Closure
Downstream Vlv Close Datetime
2021-11-30 04:24:00
Downstream Valve Type Ind
Automatic
Notify Qualified Indiv Ind
Yes
Qualified Indiv Notif Datetime
2021-11-30 04:27:00
Oil Spill Removal Org Ind
Yes
Osro Activated Datetime
2021-11-30 04:27:00
Osro Arrived On Site Dt
11/30/2021 5:00
Num Pub Evacuated
0
Pipe Fac Name
Flow Station 1
Segment Name
Otl 12
Onshore State Abbreviation
Ak
Onshore Postal Code
99734
Onshore City Name
Deadhorse
Onshore County Name
North Slope Borough
Designated Location
Survey Station No.
Designated Name
Mod 4913
Federal
No
Location Type
Totally Contained On Operator-Controlled Property
Incident Area Type
Aboveground
Incident Area Subtype
Inside A Building
Crossing
No
Pipe Facility Type
Intrastate
Item Involved
Pipe
Pipe Type
Pipe Body
Puddle Weld Ind
No
Pipe Diameter
12
Pipe Wall Thickness
0.5
Pipe Smys
60000
Pipe Specification
5l X60
Pipe Seam Type
Seamless
Pipe Manufacturer
Shaw Naptech, Inc
Pipe Coating Type
Other
Pipe Coating Details
Inorganic Zinc
Coating Applied Ind
No
Installation Year
2008
Manufactured Year
2007
Material Involved
Carbon Steel
Release Type
Leak
Leak Type
Pinhole
Wildlife Impact Ind
No
Soil Contamination
Yes
Long Term Assessment
No
Remediation Ind
No
Water Contam Ind
No
Could Be Hca
Yes
Commodity Reached Hca
Yes
Other Pop Ind
Yes
Other Pop Yes No
Yes
Est Cost Oper Paid
0
Est Cost Gas Released
100
Est Cost Prop Damage
150000
Est Cost Emergency
50000
Est Cost Environmental
10000
Est Cost Other
0
Prpty
210100
Num Persons Hosp Not Ovnght
0
Num Injured Treated By Emt
0
Num Resident Building Affctd
0
Num Business Building Affctd
0
Accident Psig
99
Mop Psig
740
Mop Cfr Section
Component Design Pressure �195.406(A)(2)
Maop Established Date
2021-08-26 00:00:00
Maop Reversal Flow Ind
No
Accident Pressure
Pressure Did Not Exceed Mop
Pressure Restriction Ind
No
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
The control room was not involved in the detection of the leak and the event was not related to operator error.
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 Microbiological Ind
Yes
Int Field Exam Basis Ind
Yes
Int Elbow Loc Ind
Yes
Corrosion Inhibitors
Yes
Corrosion Lining
No
Cleaning Dewatering
Yes
Corrosion Coupons
Yes
Collected Data Ind
Yes
Axial Magnetic Flx Lkg Ind
Yes
Axial Recent Year
2017
Axial Rcnt Propul Method
Free Swimming
Axial Rcnt Attuned Detect
Metal Loss
Axial Rcnt Atnd Dtct Metal
High Resolution
Axial Previous Year
2012
Axial Prev Propul Method
Free Swimming
Axial Prev Attuned Detect
Metal Loss
Axial Prev Atnd Dtct Metal
High Resolution
Has Hydrtst Conduc Before Ind
Yes
Hydrtst Most Rcnt Year
2008
Hydrtst Most Rcnt Pressure
1015
Direct Asmnt Conducted
No
Non Destructive Exam Ind
Yes
Exm Other Type
Digital Radiography
Exm Other Rcnt Year
2013
Exm Other Rcnt Ind
Yes
Preparer Name
J***** S*****
Preparer Title
Compliance Specialist
Preparer Email
J******@h******.com
Preparer Telephone
(907) 777-8538
Prepared Date
2022-02-07 00:00:00
Authorizer Name
B******* W*****
Authorizer Telephone
(907) 777-8447
Authorizer Title
Pipeline Risk And Compliance Manager
Authorizer Email
B******@h******.com
Narrative
A pipeline operator found a pinhole leak in the ot-12 pipeline during routine operations and maintenance activities and shut-in the pipeline at 4:22 am on november 30, 2021. Notice to nrc was made at 5:13 am. The pinhole leak was located on aboveground pig receiver inlet piping located in module 4913 at greater prudhoe bay - flow station 1. The pinhole leak was at 6 o'clock on a 90-degree, 3-d bend that is constructed of .500-inch, x60 pipe, with a 12-inch nominal diameter. Due to the leak, controllers shut down and depressurized the pipeline. Once safe to do so, operators applied a temporary repair per manufacturers instructions. The pipeline was restarted at 4:50 am on december 1. A permanent repair is under design and will be executed as soon as winter freeze conditions diminish. The estimated leak time was less than one hour, during which 70-gallons of crude oil leaked into module 4913. The module contained the crude oil with the exception of a small quantity that became trapped in an insulation soffit. The small quantity of crude oil that was trapped in the insulation soffit dripped to the gravel pad below the module. Twenty-five yards of potentially contaminated gravel was removed from the pad for remediation.
| Report Received Date | 2021-12-21 00:00:00 |
|---|---|
| Iyear | 2021 |
| Report Number | 20210350 |
| Supplemental Number | 36317 |
| Report Type | Supplemental Final |
| Operator Id | 1541 PHMSA Enforcement |
| Name | Hilcorp North Slope, Llc |
| Operator Street Address | 3800 Centerpoint Drive Suite 1400 |
| Operator City Name | Anchorage |
| Operator State Abbreviation | AK |
| Operator Postal Code | 99503 |
| Local Datetime | 2021-11-30 04:22:00 |
| Time Zone | Alaska |
| Daylight Savings Ind | Yes |
| Location Latitude | 70.25722 Google Maps OpenStreetMap |
| Location Longitude | -148.4358 Google Maps OpenStreetMap |
| Commodity Released Type | Crude Oil |
| Unintentional Release Bbls | 1.6 |
| Recovered Bbls | 1.5 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Accident Identifier | Ground Patrol By Operator Or Its Contractor |
| Operator Type | Operator Employee |
| Incident Identified Datetime | 2021-11-30 04:05:00 |
| System Part Involved | Onshore Pipeline, Including Valve Sites |
| On Off Shore | Onshore |
| Status When Identified | Normal Operation, Includes Pauses Between Batches And During Maintenance |
| Shutdown Due Accident Ind | Yes |
| Shutdown Datetime | 2021-11-30 04:22:00 |
| Restart Datetime | 2021-12-01 04:50:00 |
| Communication State Fed Ind | No |
| On Site Datetime | 2021-11-30 04:05:00 |
| Confirmed Discovery Datetime | 2021-11-30 04:22:00 |
| Nrc Rpt Datetime | 2021-11-30 05:13:00 |
| Nrc Rpt Num | 1323189 NRC Report How to search |
| Additional Nrc Report Numbers | 1323265 |
| Ignite Ind | No |
| Upstream Action Taken | Operational Control |
| Upstream Oprtnl Cntrl Detail | Crude Oil At Production Facility Was Diverted To Production Slop Tank. |
| Downstream Action Taken | Valve Closure |
| Downstream Vlv Close Datetime | 2021-11-30 04:24:00 |
| Downstream Valve Type Ind | Automatic |
| Notify Qualified Indiv Ind | Yes |
| Qualified Indiv Notif Datetime | 2021-11-30 04:27:00 |
| Oil Spill Removal Org Ind | Yes |
| Osro Activated Datetime | 2021-11-30 04:27:00 |
| Osro Arrived On Site Dt | 11/30/2021 5:00 |
| Num Pub Evacuated | 0 |
| Pipe Fac Name | Flow Station 1 |
| Segment Name | Otl 12 |
| Onshore State Abbreviation | Ak |
| Onshore Postal Code | 99734 |
| Onshore City Name | Deadhorse |
| Onshore County Name | North Slope Borough |
| Designated Location | Survey Station No. |
| Designated Name | Mod 4913 |
| Federal | No |
| Location Type | Totally Contained On Operator-Controlled Property |
| Incident Area Type | Aboveground |
| Incident Area Subtype | Inside A Building |
| Crossing | No |
| Pipe Facility Type | Intrastate |
| Item Involved | Pipe |
| Pipe Type | Pipe Body |
| Puddle Weld Ind | No |
| Pipe Diameter | 12 |
| Pipe Wall Thickness | 0.5 |
| Pipe Smys | 60000 |
| Pipe Specification | 5l X60 |
| Pipe Seam Type | Seamless |
| Pipe Manufacturer | Shaw Naptech, Inc |
| Pipe Coating Type | Other |
| Pipe Coating Details | Inorganic Zinc |
| Coating Applied Ind | No |
| Installation Year | 2008 |
| Manufactured Year | 2007 |
| Material Involved | Carbon Steel |
| Release Type | Leak |
| Leak Type | Pinhole |
| Wildlife Impact Ind | No |
| Soil Contamination | Yes |
| Long Term Assessment | No |
| Remediation Ind | No |
| Water Contam Ind | No |
| Could Be Hca | Yes |
| Commodity Reached Hca | Yes |
| Other Pop Ind | Yes |
| Other Pop Yes No | Yes |
| Est Cost Oper Paid | 0 |
| Est Cost Gas Released | 100 |
| Est Cost Prop Damage | 150000 |
| Est Cost Emergency | 50000 |
| Est Cost Environmental | 10000 |
| Est Cost Other | 0 |
| Prpty | 210100 |
| Num Persons Hosp Not Ovnght | 0 |
| Num Injured Treated By Emt | 0 |
| Num Resident Building Affctd | 0 |
| Num Business Building Affctd | 0 |
| Accident Psig | 99 |
| Mop Psig | 740 |
| Mop Cfr Section | Component Design Pressure �195.406(A)(2) View CFR 49 §192 |
| Maop Established Date | 2021-08-26 00:00:00 |
| Maop Reversal Flow Ind | No |
| Accident Pressure | Pressure Did Not Exceed Mop |
| Pressure Restriction Ind | No |
| 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 | The control room was not involved in the detection of the leak and the event was not related to operator error. |
| 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 Microbiological Ind | Yes |
| Int Field Exam Basis Ind | Yes |
| Int Elbow Loc Ind | Yes |
| Corrosion Inhibitors | Yes |
| Corrosion Lining | No |
| Cleaning Dewatering | Yes |
| Corrosion Coupons | Yes |
| Collected Data Ind | Yes |
| Axial Magnetic Flx Lkg Ind | Yes |
| Axial Recent Year | 2017 |
| Axial Rcnt Propul Method | Free Swimming |
| Axial Rcnt Attuned Detect | Metal Loss |
| Axial Rcnt Atnd Dtct Metal | High Resolution |
| Axial Previous Year | 2012 |
| Axial Prev Propul Method | Free Swimming |
| Axial Prev Attuned Detect | Metal Loss |
| Axial Prev Atnd Dtct Metal | High Resolution |
| Has Hydrtst Conduc Before Ind | Yes |
| Hydrtst Most Rcnt Year | 2008 |
| Hydrtst Most Rcnt Pressure | 1015 |
| Direct Asmnt Conducted | No |
| Non Destructive Exam Ind | Yes |
| Exm Other Type | Digital Radiography |
| Exm Other Rcnt Year | 2013 |
| Exm Other Rcnt Ind | Yes |
| Preparer Name | J***** S***** |
| Preparer Title | Compliance Specialist |
| Preparer Email | J******@h******.com |
| Preparer Telephone | (907) 777-8538 |
| Prepared Date | 2022-02-07 00:00:00 |
| Authorizer Name | B******* W***** |
| Authorizer Telephone | (907) 777-8447 |
| Authorizer Title | Pipeline Risk And Compliance Manager |
| Authorizer Email | B******@h******.com |
| Narrative | A pipeline operator found a pinhole leak in the ot-12 pipeline during routine operations and maintenance activities and shut-in the pipeline at 4:22 am on november 30, 2021. Notice to nrc was made at 5:13 am. The pinhole leak was located on aboveground pig receiver inlet piping located in module 4913 at greater prudhoe bay - flow station 1. The pinhole leak was at 6 o'clock on a 90-degree, 3-d bend that is constructed of .500-inch, x60 pipe, with a 12-inch nominal diameter. Due to the leak, controllers shut down and depressurized the pipeline. Once safe to do so, operators applied a temporary repair per manufacturers instructions. The pipeline was restarted at 4:50 am on december 1. A permanent repair is under design and will be executed as soon as winter freeze conditions diminish. The estimated leak time was less than one hour, during which 70-gallons of crude oil leaked into module 4913. The module contained the crude oil with the exception of a small quantity that became trapped in an insulation soffit. The small quantity of crude oil that was trapped in the insulation soffit dripped to the gravel pad below the module. Twenty-five yards of potentially contaminated gravel was removed from the pad for remediation. |
External Resources
PHMSA pipeline safety insights.
Product
Features
Company
All rights reserved. Copyright © by ClearPHMSA