Incident details
Operator, cause, commodity and consequences with raw source fields.
HL incident on 2017-07-27 — OK
Operator
Oneok Ngl Pipeline, Llc
Cause
Excavation Issue
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)
$250,000
Incident datetime
2017-07-27 18:07
Report number
Location
OK
Narrative
At approximately 16:44 on 7/26/2017, oneok field representative was contacted by carstensen construction and informed the construction crew intended to bore under oneok's bear creek lateral along st hwy 34 the following day. The location had been previously identified by north dakota one-call ticket number 17081108. On 7/27/2017, oneok employee met with carstensen construction at the location to prepare for the bore crossing. At approximately 12:40, carstensen construction calibrated their locating instrument with the transmitter on the head of the drill boring tool. The calibration of the equipment was witnessed by the oneok employee. Before starting the bore, carstensen construction informed the oneok employee, they were going to move the bore route south, towards the road, but this would not affect the crossing of the oneok pipeline. Once the bore began, carstensen construction monitored the depth of the bore head every 10 feet and shared these depth readings with the oneok employee. When the bore was directly under the oneok pipeline, carstensen construction identified the depth of the bore head to be 15 feet 8 inches, which indicated the bore approximately 8 feet 1 1/2 inches below the oneok pipeline. Upon completion of the initial bore and the drill head exiting the ground downstream of the oneok pipeline, the oneok employee left the drill site at 15:17 hours. Carstensen construction continued to work by reaming the bore in the opposite direction. At approximately 18:07 on the 27th, the oneok employee received a call from carstensen construction stating the oneok pipeline had been struck and a vapor cloud was visible at the bore location. The oneok representative immediately began the emergency response, contacting oneok pipeline control center and his supervisor. The oneok pipeline control center confirmed a pressure drop on the pipeline from 892 psig to 650 psig at which time the injection from the oneok rockies midstream bear creek plant was stopped at 18:21. Oneok personnel were dispatched to isolate the damaged section by closing the upstream and downstream block valves. Approximately 9 miles of 8 inch pipeline was isolated. The mckenzie county, north dakota, emergency manager, county sherriff's department and the watford city fire department were notified and arrived on site to assist as necessary. St hwy 34 was closed at approximately 18:19 to prevent traffic from accidently accessing the release site. A resident, located approximately 3000 feet to the north of the release, was asked to shelter in place until such time as the extent of the release was determined. At approximately 21:15 the mckenzie county emergency manager notified oneok personnel that he was going to release the emergency personnel as he believed oneok had secured the site. Oneok employees remained on site at the location and continuously monitored the hydrocarbon vapors until the damage section was removed and replaced on july 30, 2017. Once oneok was able to excavate the location and identify the location of the release, it was determined the boring stem of drill head used by carstensen construction had come into contact with the bottom of the oneok pipeline and had worn through the wall of the pipe causing the release. Upon completion of the excavation, the bottom of the oneok pipeline was determined to be 7 feet 6 1/2 inches below the surface. This was the same location that carstensen constructions tool head locator had identified the bore head to be at a depth of 15 feet 8 inches, which should have allowed for adequate clearance for the crossing. The isolated section of pipe was purged of hydrocarbons with nitrogen and the damaged section removed and replaced with pretested pipe. The utility crossing was also installed at this time. The boring contractor has assumed liability for the accident. Edited 5/17/2018 by n. Jones
Detailed record list
Report Received Date
2017-08-22 00:00:00
Iyear
2017
Report Number
20170260
Supplemental Number
30331
Report Type
Supplemental Final
Operator Id
32109
Name
Oneok Ngl Pipeline, Llc
Operator Street Address
100 West Fifth Street
Operator City Name
Tulsa
Operator State Abbreviation
OK
Operator Postal Code
74103
Local Datetime
2017-07-27 18:07:00
Location Latitude
47.66768465
Location Longitude
-103.205517
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
3000
Intentional Release Bbls
0
Recovered Bbls
0
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Accident Identifier
Notification From Third Party That Caused The Accident
Incident Identified Datetime
2017-07-27 18:07:00
System Part Involved
Onshore Pipeline, Including Valve Sites
On Off Shore
Onshore
Shutdown Due Accident Ind
Yes
Shutdown Datetime
2017-07-27 19:16:00
Restart Datetime
2017-07-31 01:12:00
On Site Datetime
2017-07-27 18:32:00
Nrc Rpt Datetime
2017-07-27 19:38:00
Nrc Rpt Num
1185479
Ignite Ind
No
Explode Ind
No
Upstream Valve Type Ind
Manual
Downstream Valve Type Ind
Manual
Num Pub Evacuated
0
Pipe Fac Name
Oneok Bear Creek Lateral
Segment Name
Oneok Index Number 10599
Onshore State Abbreviation
Nd
Onshore Postal Code
58854
Onshore City Name
Not Within A Municipality
Onshore County Name
Mckenzie
Designated Location
Survey Station No.
Designated Name
1761+63
Federal
No
Location Type
Pipeline Right-Of-Way
Incident Area Type
Underground
Incident Area Subtype
Under Soil
Depth Of Cover
84
Crossing
No
Pipe Facility Type
Interstate
Item Involved
Pipe
Pipe Type
Pipe Body
Pipe Diameter
8
Pipe Wall Thickness
0.219
Pipe Smys
60000
Pipe Specification
Api 5l
Pipe Seam Type
Erw - High Frequency
Pipe Manufacturer
Paragon
Pipe Coating Type
Fusion Bonded Epoxy(Fbe)
Installation Year
2016
Manufactured Year
2015
Material Involved
Carbon Steel
Release Type
Mechanical Puncture
Puncture Axial
2
Puncture Circum
1
Wildlife Impact Ind
Yes
Birds Impact Ind
Yes
Terrestrial Impact Ind
Yes
Soil Contamination
Yes
Long Term Assessment
No
Remediation Ind
Yes
Soil Remed Ind
Yes
Vegetation Remed Ind
Yes
Water Contam Ind
No
Could Be Hca
No
Commodity Reached Hca
No
Est Cost Oper Paid
55000
Est Cost Gas Released
78500
Est Cost Prop Damage
250000
Est Cost Emergency
38000
Est Cost Environmental
300000
Est Cost Other
0
Prpty
721500
Accident Psig
892
Mop Psig
1440
Accident Pressure
Pressure Did Not Exceed Mop
Pressure Restriction Ind
No
Length Segment Isolated
47434
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
Yes
Cpm In Place 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
No controller actions had taken place prior to the accident.
Employee Drug Test Ind
Yes
Contractor Drug Test Ind
No
Num Employees Tested
1
Num Employees Failed
0
Cause
Excavation Damage
Cause Details
Excavation Damage By Third Party
Ex Party Type
Excavation Damage By Third Party
Prior Notification Ind
Yes
One Call System Ind
Yes
Excavator Ind
Yes
Contractor Ind
Yes
Notify Cga Dirt
Yes
Public Row Ind
Yes
Public Subtype
County Road
Private Row Ind
Yes
Private Subtype
Private Landowner
Pipeline Easement Row Ind
Yes
Excavator Type
Utility
Excavator Equipment
Directional Drilling
Work Performed
Water
One Call Notified Ind
Yes
One Call Ticket Num
17081108
Locator Type
Utility Owner
Visible Marks
Yes
Service Interruption
Yes
Service Interruption Hours
76
Root Cause Category
Excavation Issue
Root Cause Type
Excavator Failed To Maintain Clearance After Verifying Marks
Preparer Name
N*** J****
Preparer Title
Requlatory Compliance Manager
Preparer Email
N*********@o****.com
Preparer Telephone
580-395-6304
Preparer Fax
580-395-2933
Prepared Date
2018-05-17 00:00:00
Authorizer Name
N*** J****
Authorizer Telephone
580-395-6304
Authorizer Title
Regulatory Compliance Manager
Authorizer Email
N*********@o****.com
Narrative
At approximately 16:44 on 7/26/2017, oneok field representative was contacted by carstensen construction and informed the construction crew intended to bore under oneok's bear creek lateral along st hwy 34 the following day. The location had been previously identified by north dakota one-call ticket number 17081108. On 7/27/2017, oneok employee met with carstensen construction at the location to prepare for the bore crossing. At approximately 12:40, carstensen construction calibrated their locating instrument with the transmitter on the head of the drill boring tool. The calibration of the equipment was witnessed by the oneok employee. Before starting the bore, carstensen construction informed the oneok employee, they were going to move the bore route south, towards the road, but this would not affect the crossing of the oneok pipeline. Once the bore began, carstensen construction monitored the depth of the bore head every 10 feet and shared these depth readings with the oneok employee. When the bore was directly under the oneok pipeline, carstensen construction identified the depth of the bore head to be 15 feet 8 inches, which indicated the bore approximately 8 feet 1 1/2 inches below the oneok pipeline. Upon completion of the initial bore and the drill head exiting the ground downstream of the oneok pipeline, the oneok employee left the drill site at 15:17 hours. Carstensen construction continued to work by reaming the bore in the opposite direction. At approximately 18:07 on the 27th, the oneok employee received a call from carstensen construction stating the oneok pipeline had been struck and a vapor cloud was visible at the bore location. The oneok representative immediately began the emergency response, contacting oneok pipeline control center and his supervisor. The oneok pipeline control center confirmed a pressure drop on the pipeline from 892 psig to 650 psig at which time the injection from the oneok rockies midstream bear creek plant was stopped at 18:21. Oneok personnel were dispatched to isolate the damaged section by closing the upstream and downstream block valves. Approximately 9 miles of 8 inch pipeline was isolated. The mckenzie county, north dakota, emergency manager, county sherriff's department and the watford city fire department were notified and arrived on site to assist as necessary. St hwy 34 was closed at approximately 18:19 to prevent traffic from accidently accessing the release site. A resident, located approximately 3000 feet to the north of the release, was asked to shelter in place until such time as the extent of the release was determined. At approximately 21:15 the mckenzie county emergency manager notified oneok personnel that he was going to release the emergency personnel as he believed oneok had secured the site. Oneok employees remained on site at the location and continuously monitored the hydrocarbon vapors until the damage section was removed and replaced on july 30, 2017. Once oneok was able to excavate the location and identify the location of the release, it was determined the boring stem of drill head used by carstensen construction had come into contact with the bottom of the oneok pipeline and had worn through the wall of the pipe causing the release. Upon completion of the excavation, the bottom of the oneok pipeline was determined to be 7 feet 6 1/2 inches below the surface. This was the same location that carstensen constructions tool head locator had identified the bore head to be at a depth of 15 feet 8 inches, which should have allowed for adequate clearance for the crossing. The isolated section of pipe was purged of hydrocarbons with nitrogen and the damaged section removed and replaced with pretested pipe. The utility crossing was also installed at this time. The boring contractor has assumed liability for the accident. Edited 5/17/2018 by n. Jones
| Report Received Date | 2017-08-22 00:00:00 |
|---|---|
| Iyear | 2017 |
| Report Number | 20170260 |
| Supplemental Number | 30331 |
| Report Type | Supplemental Final |
| Operator Id | 32109 PHMSA Enforcement |
| Name | Oneok Ngl Pipeline, Llc |
| Operator Street Address | 100 West Fifth Street |
| Operator City Name | Tulsa |
| Operator State Abbreviation | OK |
| Operator Postal Code | 74103 |
| Local Datetime | 2017-07-27 18:07:00 |
| Location Latitude | 47.66768465 Google Maps OpenStreetMap |
| Location Longitude | -103.205517 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 | 3000 |
| Intentional Release Bbls | 0 |
| Recovered Bbls | 0 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Accident Identifier | Notification From Third Party That Caused The Accident |
| Incident Identified Datetime | 2017-07-27 18:07:00 |
| System Part Involved | Onshore Pipeline, Including Valve Sites |
| On Off Shore | Onshore |
| Shutdown Due Accident Ind | Yes |
| Shutdown Datetime | 2017-07-27 19:16:00 |
| Restart Datetime | 2017-07-31 01:12:00 |
| On Site Datetime | 2017-07-27 18:32:00 |
| Nrc Rpt Datetime | 2017-07-27 19:38:00 |
| Nrc Rpt Num | 1185479 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 | Oneok Bear Creek Lateral |
| Segment Name | Oneok Index Number 10599 |
| Onshore State Abbreviation | Nd |
| Onshore Postal Code | 58854 |
| Onshore City Name | Not Within A Municipality |
| Onshore County Name | Mckenzie |
| Designated Location | Survey Station No. |
| Designated Name | 1761+63 |
| Federal | No |
| Location Type | Pipeline Right-Of-Way |
| Incident Area Type | Underground |
| Incident Area Subtype | Under Soil |
| Depth Of Cover | 84 |
| Crossing | No |
| Pipe Facility Type | Interstate |
| Item Involved | Pipe |
| Pipe Type | Pipe Body |
| Pipe Diameter | 8 |
| Pipe Wall Thickness | 0.219 |
| Pipe Smys | 60000 |
| Pipe Specification | Api 5l |
| Pipe Seam Type | Erw - High Frequency |
| Pipe Manufacturer | Paragon |
| Pipe Coating Type | Fusion Bonded Epoxy(Fbe) |
| Installation Year | 2016 |
| Manufactured Year | 2015 |
| Material Involved | Carbon Steel |
| Release Type | Mechanical Puncture |
| Puncture Axial | 2 |
| Puncture Circum | 1 |
| Wildlife Impact Ind | Yes |
| Birds Impact Ind | Yes |
| Terrestrial Impact Ind | Yes |
| Soil Contamination | Yes |
| Long Term Assessment | No |
| Remediation Ind | Yes |
| Soil Remed Ind | Yes |
| Vegetation Remed Ind | Yes |
| Water Contam Ind | No |
| Could Be Hca | No |
| Commodity Reached Hca | No |
| Est Cost Oper Paid | 55000 |
| Est Cost Gas Released | 78500 |
| Est Cost Prop Damage | 250000 |
| Est Cost Emergency | 38000 |
| Est Cost Environmental | 300000 |
| Est Cost Other | 0 |
| Prpty | 721500 |
| Accident Psig | 892 |
| Mop Psig | 1440 |
| Accident Pressure | Pressure Did Not Exceed Mop |
| Pressure Restriction Ind | No |
| Length Segment Isolated | 47434 |
| 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 | Yes |
| Cpm In Place 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 | No controller actions had taken place prior to the accident. |
| Employee Drug Test Ind | Yes |
| Contractor Drug Test Ind | No |
| Num Employees Tested | 1 |
| Num Employees Failed | 0 |
| Cause | Excavation Damage |
| Cause Details | Excavation Damage By Third Party |
| Ex Party Type | Excavation Damage By Third Party |
| Prior Notification Ind | Yes |
| One Call System Ind | Yes |
| Excavator Ind | Yes |
| Contractor Ind | Yes |
| Notify Cga Dirt | Yes |
| Public Row Ind | Yes |
| Public Subtype | County Road |
| Private Row Ind | Yes |
| Private Subtype | Private Landowner |
| Pipeline Easement Row Ind | Yes |
| Excavator Type | Utility |
| Excavator Equipment | Directional Drilling |
| Work Performed | Water |
| One Call Notified Ind | Yes |
| One Call Ticket Num | 17081108 |
| Locator Type | Utility Owner |
| Visible Marks | Yes |
| Service Interruption | Yes |
| Service Interruption Hours | 76 |
| Root Cause Category | Excavation Issue |
| Root Cause Type | Excavator Failed To Maintain Clearance After Verifying Marks |
| Preparer Name | N*** J**** |
| Preparer Title | Requlatory Compliance Manager |
| Preparer Email | N*********@o****.com |
| Preparer Telephone | 580-395-6304 |
| Preparer Fax | 580-395-2933 |
| Prepared Date | 2018-05-17 00:00:00 |
| Authorizer Name | N*** J**** |
| Authorizer Telephone | 580-395-6304 |
| Authorizer Title | Regulatory Compliance Manager |
| Authorizer Email | N*********@o****.com |
| Narrative | At approximately 16:44 on 7/26/2017, oneok field representative was contacted by carstensen construction and informed the construction crew intended to bore under oneok's bear creek lateral along st hwy 34 the following day. The location had been previously identified by north dakota one-call ticket number 17081108. On 7/27/2017, oneok employee met with carstensen construction at the location to prepare for the bore crossing. At approximately 12:40, carstensen construction calibrated their locating instrument with the transmitter on the head of the drill boring tool. The calibration of the equipment was witnessed by the oneok employee. Before starting the bore, carstensen construction informed the oneok employee, they were going to move the bore route south, towards the road, but this would not affect the crossing of the oneok pipeline. Once the bore began, carstensen construction monitored the depth of the bore head every 10 feet and shared these depth readings with the oneok employee. When the bore was directly under the oneok pipeline, carstensen construction identified the depth of the bore head to be 15 feet 8 inches, which indicated the bore approximately 8 feet 1 1/2 inches below the oneok pipeline. Upon completion of the initial bore and the drill head exiting the ground downstream of the oneok pipeline, the oneok employee left the drill site at 15:17 hours. Carstensen construction continued to work by reaming the bore in the opposite direction. At approximately 18:07 on the 27th, the oneok employee received a call from carstensen construction stating the oneok pipeline had been struck and a vapor cloud was visible at the bore location. The oneok representative immediately began the emergency response, contacting oneok pipeline control center and his supervisor. The oneok pipeline control center confirmed a pressure drop on the pipeline from 892 psig to 650 psig at which time the injection from the oneok rockies midstream bear creek plant was stopped at 18:21. Oneok personnel were dispatched to isolate the damaged section by closing the upstream and downstream block valves. Approximately 9 miles of 8 inch pipeline was isolated. The mckenzie county, north dakota, emergency manager, county sherriff's department and the watford city fire department were notified and arrived on site to assist as necessary. St hwy 34 was closed at approximately 18:19 to prevent traffic from accidently accessing the release site. A resident, located approximately 3000 feet to the north of the release, was asked to shelter in place until such time as the extent of the release was determined. At approximately 21:15 the mckenzie county emergency manager notified oneok personnel that he was going to release the emergency personnel as he believed oneok had secured the site. Oneok employees remained on site at the location and continuously monitored the hydrocarbon vapors until the damage section was removed and replaced on july 30, 2017. Once oneok was able to excavate the location and identify the location of the release, it was determined the boring stem of drill head used by carstensen construction had come into contact with the bottom of the oneok pipeline and had worn through the wall of the pipe causing the release. Upon completion of the excavation, the bottom of the oneok pipeline was determined to be 7 feet 6 1/2 inches below the surface. This was the same location that carstensen constructions tool head locator had identified the bore head to be at a depth of 15 feet 8 inches, which should have allowed for adequate clearance for the crossing. The isolated section of pipe was purged of hydrocarbons with nitrogen and the damaged section removed and replaced with pretested pipe. The utility crossing was also installed at this time. The boring contractor has assumed liability for the accident. Edited 5/17/2018 by n. Jones |
External Resources
PHMSA pipeline safety insights.
Product
Features
Company
All rights reserved. Copyright © by ClearPHMSA