Incident details
Operator, cause, commodity and consequences with raw source fields.
GTG incident on 2018-11-20 — TX
Operator
Colorado Interstate Gas Co
Cause
Miscellaneous Root Causes
Commodity
Natural Gas
Program
GTG
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$28,414
Incident datetime
2018-11-20 15:13
Report number
Location
TX
Narrative
On november 20, 2018 at 3:13 pm mst colorado intrastate gas company (cig) gas control received a call from a third-party contractor indicating that while grading they the third-party contractor had hit and punctured a natural gas pipeline. Cig personnel arrived at the location of the line strike at 3:43 pm mst and confirmed that it was on the cig pipeline. The third-party contractor struck the cig 9a pipeline while grading the area for a new housing development. There was an open one call ticket and cig damage prevention personnel had marked the line. The contractor had previously agreed orally and in writing to cig's request that a cig representative be onsite for any work within 25 feet of our pipeline assets. Further, the contractor told cig a few days before the incident that no work would be performed within 25 feet of the pipeline on the day of the line strike. Despite the pipeline markings and the prior agreements, the third-party contractor proceeded with grading over the pipeline without notifying cig. Post confirmation by cig field personnel that our pipeline had been struck, they proceeded to isolate the pipeline between mlv 11 and 11.9. Cig then implemented a blow down process for this segment. Once the leak site was declared safe and free of gas vapors cig proceeded to make repairs. The repairs consisted of replacing sixty feet of pretested twenty inch pipe. The repairs were completed on november 21, 2018. Upon completing the repairs cig implemented a purge and pack process for this segment. Once the purge process was confirmed to be completed the segment pressure was allowed to equalize. The segment was then returned to gas control for normal operations and was back in service at 7:42 pm mst on november 21, 2018.
Detailed record list
Report Received Date
2018-12-18 00:00:00
Iyear
2018
Report Number
20180132
Supplemental Number
31694
Report Type
Supplemental Final
Operator Id
2564
Name
Colorado Interstate Gas Co
Operator Street Address
1001 Louisiana St, Suite 1000
Operator City Name
Houston
Operator State Abbreviation
TX
Operator Postal Code
77002
Local Datetime
2018-11-20 15:13:00
Location Latitude
39.6983
Location Longitude
-104.7007
Nrc Rpt Num
1230933
Nrc Rpt Datetime
2018-11-20 16:33:00
Commodity Released Type
Natural Gas
Unintentional Release
5962
Intentional Release
3045
Accompanying Liquid
0
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Shutdown Due Accident Ind
Yes
Shutdown Datetime
2018-11-20 16:14:00
Restart Datetime
2018-11-21 19:42:00
Ignite Ind
No
Explode Ind
No
Num Pub Evacuated
0
Incident Identified Datetime
2018-11-20 15:13:00
On Site Datetime
2018-11-20 15:43:00
On Off Shore
Onshore
Onshore State Abbreviation
Co
Onshore Postal Code
80018
Onshore City Name
Aurora
Onshore County Name
Arapahoe
Designated Location
Milepost
Designated Name
Mp 105+4872
Pipe Fac Name
9a Pipeline
Segment Name
Pueblo/watkins Mainline
Federal
No
Location Type
Pipeline Right-Of-Way
Incident Area Type
Underground
Incident Area Subtype
Under Soil
Depth Of Cover
44
Crossing
No
Pipe Facility Type
Interstate
System Part Involved
Onshore Pipeline, Including Valve Sites
Item Involved
Pipe
Pipe Type
Pipe Body
Pipe Diameter
20
Pipe Wall Thickness
0.25
Pipe Smys
60000
Pipe Specification
Api 5l X-60
Pipe Seam Type
Dsaw
Pipe Manufacturer
Kaiser Steel
Pipe Coating Type
Coal Tar
Installation Year
1966
Manufactured Year
1966
Material Involved
Carbon Steel
Release Type
Mechanical Puncture
Puncture Axial
3
Puncture Circum
3.3
Class Location Type
Class 3 Location
Could Be Hca
No
Pir Radius
395
Heat Damage Ind
No
Non Heat Damage Ind
No
Hca Fatalities Ind
No
Est Cost Oper Paid
0
Est Cost Unintentional Release
23722
Est Cost Intentional Release
12116
Est Cost Prop Damage
28414
Est Cost Emergency
0
Est Cost Other
0
Prpty
64252
Accident Psig
500
Mop Psig
820
Mop Cfr Section
192.619(A)(1)
Accident Pressure
Pressure Did Not Exceed Maop
Pressure Restriction Ind
No
Upstream Valve Type Ind
Manual
Downstream Valve Type Ind
Remotely Controlled
Length Segment Isolated
38260
Internal Inspection Ind
Yes
Operation Complications Ind
No
Pipeline Function
Transmission System
Scada In Place Ind
Yes
Scada Operating Ind
Yes
Scada Functional Ind
Yes
Scada Detection Ind
Yes
Scada Conf Ind
Yes
Accident Identifier
Notification From Third Party That Caused The Incident
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 incident was caused by a third-party line strike
Employee Drug Test Ind
No
Contractor Drug Test Ind
No
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
Notify Cga Dirt
No
Private Row Ind
Yes
Private Subtype
Private Business
Pipeline Easement Row Ind
Yes
Excavator Type
Contractor
Excavator Equipment
Grader/scraper
Work Performed
Site Development
One Call Notified Ind
Yes
One Call Ticket Num
830500140
Locator Type
Utility Owner
Visible Marks
Yes
Service Interruption
No
Root Cause Category
Miscellaneous Root Causes
Root Cause Type
Root Cause Not Listed (Comment Required)
Root Cause Type Other
Inadequate Instruction And Communication By Hei Construction
Preparer Name
K**** B******
Preparer Title
Pipeline Engineer - Codes And Standards
Preparer Email
K************@k***********.com
Preparer Telephone
7134206633
Authorizer Name
J**** H********
Authorizer Title
Director - Codes And Standards
Authorizer Telephone
7133699443
Authorizer Email
J**************@k***************
Narrative
On november 20, 2018 at 3:13 pm mst colorado intrastate gas company (cig) gas control received a call from a third-party contractor indicating that while grading they the third-party contractor had hit and punctured a natural gas pipeline. Cig personnel arrived at the location of the line strike at 3:43 pm mst and confirmed that it was on the cig pipeline. The third-party contractor struck the cig 9a pipeline while grading the area for a new housing development. There was an open one call ticket and cig damage prevention personnel had marked the line. The contractor had previously agreed orally and in writing to cig's request that a cig representative be onsite for any work within 25 feet of our pipeline assets. Further, the contractor told cig a few days before the incident that no work would be performed within 25 feet of the pipeline on the day of the line strike. Despite the pipeline markings and the prior agreements, the third-party contractor proceeded with grading over the pipeline without notifying cig. Post confirmation by cig field personnel that our pipeline had been struck, they proceeded to isolate the pipeline between mlv 11 and 11.9. Cig then implemented a blow down process for this segment. Once the leak site was declared safe and free of gas vapors cig proceeded to make repairs. The repairs consisted of replacing sixty feet of pretested twenty inch pipe. The repairs were completed on november 21, 2018. Upon completing the repairs cig implemented a purge and pack process for this segment. Once the purge process was confirmed to be completed the segment pressure was allowed to equalize. The segment was then returned to gas control for normal operations and was back in service at 7:42 pm mst on november 21, 2018.
| Report Received Date | 2018-12-18 00:00:00 |
|---|---|
| Iyear | 2018 |
| Report Number | 20180132 |
| Supplemental Number | 31694 |
| Report Type | Supplemental Final |
| Operator Id | 2564 PHMSA Enforcement |
| Name | Colorado Interstate Gas Co |
| Operator Street Address | 1001 Louisiana St, Suite 1000 |
| Operator City Name | Houston |
| Operator State Abbreviation | TX |
| Operator Postal Code | 77002 |
| Local Datetime | 2018-11-20 15:13:00 |
| Location Latitude | 39.6983 Google Maps OpenStreetMap |
| Location Longitude | -104.7007 Google Maps OpenStreetMap |
| Nrc Rpt Num | 1230933 NRC Report How to search |
| Nrc Rpt Datetime | 2018-11-20 16:33:00 |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 5962 |
| Intentional Release | 3045 |
| Accompanying Liquid | 0 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Shutdown Due Accident Ind | Yes |
| Shutdown Datetime | 2018-11-20 16:14:00 |
| Restart Datetime | 2018-11-21 19:42:00 |
| Ignite Ind | No |
| Explode Ind | No |
| Num Pub Evacuated | 0 |
| Incident Identified Datetime | 2018-11-20 15:13:00 |
| On Site Datetime | 2018-11-20 15:43:00 |
| On Off Shore | Onshore |
| Onshore State Abbreviation | Co |
| Onshore Postal Code | 80018 |
| Onshore City Name | Aurora |
| Onshore County Name | Arapahoe |
| Designated Location | Milepost |
| Designated Name | Mp 105+4872 |
| Pipe Fac Name | 9a Pipeline |
| Segment Name | Pueblo/watkins Mainline |
| Federal | No |
| Location Type | Pipeline Right-Of-Way |
| Incident Area Type | Underground |
| Incident Area Subtype | Under Soil |
| Depth Of Cover | 44 |
| Crossing | No |
| Pipe Facility Type | Interstate |
| System Part Involved | Onshore Pipeline, Including Valve Sites |
| Item Involved | Pipe |
| Pipe Type | Pipe Body |
| Pipe Diameter | 20 |
| Pipe Wall Thickness | 0.25 |
| Pipe Smys | 60000 |
| Pipe Specification | Api 5l X-60 |
| Pipe Seam Type | Dsaw |
| Pipe Manufacturer | Kaiser Steel |
| Pipe Coating Type | Coal Tar |
| Installation Year | 1966 |
| Manufactured Year | 1966 |
| Material Involved | Carbon Steel |
| Release Type | Mechanical Puncture |
| Puncture Axial | 3 |
| Puncture Circum | 3.3 |
| Class Location Type | Class 3 Location |
| Could Be Hca | No |
| Pir Radius | 395 |
| Heat Damage Ind | No |
| Non Heat Damage Ind | No |
| Hca Fatalities Ind | No |
| Est Cost Oper Paid | 0 |
| Est Cost Unintentional Release | 23722 |
| Est Cost Intentional Release | 12116 |
| Est Cost Prop Damage | 28414 |
| Est Cost Emergency | 0 |
| Est Cost Other | 0 |
| Prpty | 64252 |
| Accident Psig | 500 |
| Mop Psig | 820 |
| Mop Cfr Section | 192.619(A)(1) View CFR 49 §192 |
| Accident Pressure | Pressure Did Not Exceed Maop |
| Pressure Restriction Ind | No |
| Upstream Valve Type Ind | Manual |
| Downstream Valve Type Ind | Remotely Controlled |
| Length Segment Isolated | 38260 |
| Internal Inspection Ind | Yes |
| Operation Complications Ind | No |
| Pipeline Function | Transmission System |
| Scada In Place Ind | Yes |
| Scada Operating Ind | Yes |
| Scada Functional Ind | Yes |
| Scada Detection Ind | Yes |
| Scada Conf Ind | Yes |
| Accident Identifier | Notification From Third Party That Caused The Incident |
| 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 incident was caused by a third-party line strike |
| Employee Drug Test Ind | No |
| Contractor Drug Test Ind | No |
| 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 |
| Notify Cga Dirt | No |
| Private Row Ind | Yes |
| Private Subtype | Private Business |
| Pipeline Easement Row Ind | Yes |
| Excavator Type | Contractor |
| Excavator Equipment | Grader/scraper |
| Work Performed | Site Development |
| One Call Notified Ind | Yes |
| One Call Ticket Num | 830500140 |
| Locator Type | Utility Owner |
| Visible Marks | Yes |
| Service Interruption | No |
| Root Cause Category | Miscellaneous Root Causes |
| Root Cause Type | Root Cause Not Listed (Comment Required) |
| Root Cause Type Other | Inadequate Instruction And Communication By Hei Construction |
| Preparer Name | K**** B****** |
| Preparer Title | Pipeline Engineer - Codes And Standards |
| Preparer Email | K************@k***********.com |
| Preparer Telephone | 7134206633 |
| Authorizer Name | J**** H******** |
| Authorizer Title | Director - Codes And Standards |
| Authorizer Telephone | 7133699443 |
| Authorizer Email | J**************@k*************** |
| Narrative | On november 20, 2018 at 3:13 pm mst colorado intrastate gas company (cig) gas control received a call from a third-party contractor indicating that while grading they the third-party contractor had hit and punctured a natural gas pipeline. Cig personnel arrived at the location of the line strike at 3:43 pm mst and confirmed that it was on the cig pipeline. The third-party contractor struck the cig 9a pipeline while grading the area for a new housing development. There was an open one call ticket and cig damage prevention personnel had marked the line. The contractor had previously agreed orally and in writing to cig's request that a cig representative be onsite for any work within 25 feet of our pipeline assets. Further, the contractor told cig a few days before the incident that no work would be performed within 25 feet of the pipeline on the day of the line strike. Despite the pipeline markings and the prior agreements, the third-party contractor proceeded with grading over the pipeline without notifying cig. Post confirmation by cig field personnel that our pipeline had been struck, they proceeded to isolate the pipeline between mlv 11 and 11.9. Cig then implemented a blow down process for this segment. Once the leak site was declared safe and free of gas vapors cig proceeded to make repairs. The repairs consisted of replacing sixty feet of pretested twenty inch pipe. The repairs were completed on november 21, 2018. Upon completing the repairs cig implemented a purge and pack process for this segment. Once the purge process was confirmed to be completed the segment pressure was allowed to equalize. The segment was then returned to gas control for normal operations and was back in service at 7:42 pm mst on november 21, 2018. |
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