Incident details
Operator, cause, commodity and consequences with raw source fields.
GTG incident on 2017-08-17 — CO
Operator
Public Service Co Of Colorado
Cause
Excavation Issue
Commodity
Natural Gas
Program
GTG
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$90,000
Incident datetime
2017-08-17 10:30
Report number
Location
CO
Narrative
On 8/17/17, a second party mechanical contractor struck the xcel/psco 8in ignacio to del norte transmission gas line approximately 16 miles southwest of del norte, colorado. While excavating a trench intended for electrical conduit for a new remote-controlled valve, the equipment operator struck a 2in t.D. Williamson thread-o-ring fitting at the 12:00 position on the 8in pipeline. As a result of the impact, the 8in pipeline failed, opening a 2.5in diameter hole in the top of the pipe. The incident location is a remote area without cellular phone service. The incident was initially discovered by the gas controller on duty by way of scada alarms and was immediately reported to operating personnel. The damaged pipeline segment was isolated by closing the manually operated upstream and downstream mainline valves. Upon completion of the electrical work, the final grade of the location will be raised to reach a minimum of 36in of cover. The initial nrc number is #1187585 and the 48-hr follow up number is #1187701.
Detailed record list
Report Received Date
2017-08-21 00:00:00
Iyear
2017
Report Number
20170069
Supplemental Number
17410
Report Type
Original Final
Operator Id
15931
Name
Public Service Co Of Colorado
Operator Street Address
3500 Blake St
Operator City Name
Denver
Operator State Abbreviation
CO
Operator Postal Code
80205
Local Datetime
2017-08-17 10:28:00
Location Latitude
37.48479
Location Longitude
-106.53275
Nrc Rpt Num
1187585
Nrc Rpt Datetime
2017-08-17 12:50:00
Commodity Released Type
Natural Gas
Unintentional Release
2951
Intentional Release
467
Accompanying Liquid
0
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Shutdown Due Accident Ind
Yes
Shutdown Datetime
2017-08-17 11:57:00
Restart Datetime
2017-08-17 22:44:00
Ignite Ind
No
Explode Ind
No
Num Pub Evacuated
0
Incident Identified Datetime
2017-08-17 10:30:00
On Site Datetime
2017-08-17 11:26:00
On Off Shore
Onshore
Onshore State Abbreviation
Co
Onshore Postal Code
81132-0000
Onshore City Name
Del Norte
Onshore County Name
Rio Grande
Designated Location
Milepost
Designated Name
3714888
Pipe Fac Name
8" Ignacio-Del Norte
Segment Name
710010
Federal
Yes
Location Type
Pipeline Right-Of-Way
Incident Area Type
Underground
Incident Area Subtype
Under Soil
Depth Of Cover
18
Crossing
No
Pipe Facility Type
Intrastate
System Part Involved
Onshore Pipeline, Including Valve Sites
Item Involved
Pipe
Pipe Type
Pipe Body
Pipe Diameter
8.625
Pipe Wall Thickness
0.188
Pipe Smys
42000
Pipe Specification
Unknown
Pipe Seam Type
Other
Pipe Seam Details
Unknown
Pipe Manufacturer
Unknown
Pipe Coating Type
Cold Applied Tape
Installation Year
1961
Manufactured Year
Unknown
Material Involved
Carbon Steel
Release Type
Mechanical Puncture
Puncture Axial
2.5
Puncture Circum
2.5
Class Location Type
Class 1 Location
Could Be Hca
No
Pir Radius
167
Heat Damage Ind
No
Non Heat Damage Ind
No
Hca Fatalities Ind
No
Est Cost Oper Paid
0
Est Cost Unintentional Release
8850
Est Cost Intentional Release
1400
Est Cost Prop Damage
90000
Est Cost Emergency
5000
Est Cost Other
0
Prpty
105250
Accident Psig
530
Mop Psig
915
Mop Cfr Section
192.619(A)(2)
Accident Pressure
Pressure Did Not Exceed Maop
Pressure Restriction Ind
No
Upstream Valve Type Ind
Manual
Downstream Valve Type Ind
Manual
Length Segment Isolated
31153
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
Scada-Based Information (Such As Alarm(S), Alert(S), Event(S), And/or Volume Or Pack Calculations)
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 properly identified on scada by the controller and prompt action taken.
Employee Drug Test Ind
No
Contractor Drug Test Ind
Yes
Num Contractors Tested
1
Num Contractors Failed
0
Cause
Excavation Damage
Cause Details
Excavation Damage By Operator's Contractor (Second Party)
Ex Party Type
Excavation Damage By Operator's Contractor (Second Party)
Notify Cga Dirt
No
Federal Land Row Ind
Yes
Excavator Type
Contractor
Excavator Equipment
Backhoe/trackhoe
Work Performed
Natural Gas
One Call Notified Ind
Yes
One Call Ticket Num
722300282
Locator Type
Utility Owner
Visible Marks
No
Service Interruption
Yes
Service Interruption Hours
10
Root Cause Category
Excavation Issue
Root Cause Type
Improper Excavation Practice Not Listed Above
Preparer Name
B****** J******
Preparer Title
Sr Engineer
Preparer Email
B****************@x*********.com
Preparer Telephone
303-571-6677
Preparer Fax
303-571-0000
Authorizer Name
M*** N****
Authorizer Title
Principal Engineer
Authorizer Telephone
303-5713931
Authorizer Email
M*********@x*********.com
Narrative
On 8/17/17, a second party mechanical contractor struck the xcel/psco 8in ignacio to del norte transmission gas line approximately 16 miles southwest of del norte, colorado. While excavating a trench intended for electrical conduit for a new remote-controlled valve, the equipment operator struck a 2in t.D. Williamson thread-o-ring fitting at the 12:00 position on the 8in pipeline. As a result of the impact, the 8in pipeline failed, opening a 2.5in diameter hole in the top of the pipe. The incident location is a remote area without cellular phone service. The incident was initially discovered by the gas controller on duty by way of scada alarms and was immediately reported to operating personnel. The damaged pipeline segment was isolated by closing the manually operated upstream and downstream mainline valves. Upon completion of the electrical work, the final grade of the location will be raised to reach a minimum of 36in of cover. The initial nrc number is #1187585 and the 48-hr follow up number is #1187701.
| Report Received Date | 2017-08-21 00:00:00 |
|---|---|
| Iyear | 2017 |
| Report Number | 20170069 |
| Supplemental Number | 17410 |
| Report Type | Original Final |
| Operator Id | 15931 PHMSA Enforcement |
| Name | Public Service Co Of Colorado |
| Operator Street Address | 3500 Blake St |
| Operator City Name | Denver |
| Operator State Abbreviation | CO |
| Operator Postal Code | 80205 |
| Local Datetime | 2017-08-17 10:28:00 |
| Location Latitude | 37.48479 Google Maps OpenStreetMap |
| Location Longitude | -106.53275 Google Maps OpenStreetMap |
| Nrc Rpt Num | 1187585 NRC Report How to search |
| Nrc Rpt Datetime | 2017-08-17 12:50:00 |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 2951 |
| Intentional Release | 467 |
| Accompanying Liquid | 0 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Shutdown Due Accident Ind | Yes |
| Shutdown Datetime | 2017-08-17 11:57:00 |
| Restart Datetime | 2017-08-17 22:44:00 |
| Ignite Ind | No |
| Explode Ind | No |
| Num Pub Evacuated | 0 |
| Incident Identified Datetime | 2017-08-17 10:30:00 |
| On Site Datetime | 2017-08-17 11:26:00 |
| On Off Shore | Onshore |
| Onshore State Abbreviation | Co |
| Onshore Postal Code | 81132-0000 |
| Onshore City Name | Del Norte |
| Onshore County Name | Rio Grande |
| Designated Location | Milepost |
| Designated Name | 3714888 |
| Pipe Fac Name | 8" Ignacio-Del Norte |
| Segment Name | 710010 |
| Federal | Yes |
| Location Type | Pipeline Right-Of-Way |
| Incident Area Type | Underground |
| Incident Area Subtype | Under Soil |
| Depth Of Cover | 18 |
| Crossing | No |
| Pipe Facility Type | Intrastate |
| System Part Involved | Onshore Pipeline, Including Valve Sites |
| Item Involved | Pipe |
| Pipe Type | Pipe Body |
| Pipe Diameter | 8.625 |
| Pipe Wall Thickness | 0.188 |
| Pipe Smys | 42000 |
| Pipe Specification | Unknown |
| Pipe Seam Type | Other |
| Pipe Seam Details | Unknown |
| Pipe Manufacturer | Unknown |
| Pipe Coating Type | Cold Applied Tape |
| Installation Year | 1961 |
| Manufactured Year | Unknown |
| Material Involved | Carbon Steel |
| Release Type | Mechanical Puncture |
| Puncture Axial | 2.5 |
| Puncture Circum | 2.5 |
| Class Location Type | Class 1 Location |
| Could Be Hca | No |
| Pir Radius | 167 |
| Heat Damage Ind | No |
| Non Heat Damage Ind | No |
| Hca Fatalities Ind | No |
| Est Cost Oper Paid | 0 |
| Est Cost Unintentional Release | 8850 |
| Est Cost Intentional Release | 1400 |
| Est Cost Prop Damage | 90000 |
| Est Cost Emergency | 5000 |
| Est Cost Other | 0 |
| Prpty | 105250 |
| Accident Psig | 530 |
| Mop Psig | 915 |
| Mop Cfr Section | 192.619(A)(2) View CFR 49 §192 |
| Accident Pressure | Pressure Did Not Exceed Maop |
| Pressure Restriction Ind | No |
| Upstream Valve Type Ind | Manual |
| Downstream Valve Type Ind | Manual |
| Length Segment Isolated | 31153 |
| 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 | Scada-Based Information (Such As Alarm(S), Alert(S), Event(S), And/or Volume Or Pack Calculations) |
| 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 properly identified on scada by the controller and prompt action taken. |
| Employee Drug Test Ind | No |
| Contractor Drug Test Ind | Yes |
| Num Contractors Tested | 1 |
| Num Contractors Failed | 0 |
| Cause | Excavation Damage |
| Cause Details | Excavation Damage By Operator's Contractor (Second Party) |
| Ex Party Type | Excavation Damage By Operator's Contractor (Second Party) |
| Notify Cga Dirt | No |
| Federal Land Row Ind | Yes |
| Excavator Type | Contractor |
| Excavator Equipment | Backhoe/trackhoe |
| Work Performed | Natural Gas |
| One Call Notified Ind | Yes |
| One Call Ticket Num | 722300282 |
| Locator Type | Utility Owner |
| Visible Marks | No |
| Service Interruption | Yes |
| Service Interruption Hours | 10 |
| Root Cause Category | Excavation Issue |
| Root Cause Type | Improper Excavation Practice Not Listed Above |
| Preparer Name | B****** J****** |
| Preparer Title | Sr Engineer |
| Preparer Email | B****************@x*********.com |
| Preparer Telephone | 303-571-6677 |
| Preparer Fax | 303-571-0000 |
| Authorizer Name | M*** N**** |
| Authorizer Title | Principal Engineer |
| Authorizer Telephone | 303-5713931 |
| Authorizer Email | M*********@x*********.com |
| Narrative | On 8/17/17, a second party mechanical contractor struck the xcel/psco 8in ignacio to del norte transmission gas line approximately 16 miles southwest of del norte, colorado. While excavating a trench intended for electrical conduit for a new remote-controlled valve, the equipment operator struck a 2in t.D. Williamson thread-o-ring fitting at the 12:00 position on the 8in pipeline. As a result of the impact, the 8in pipeline failed, opening a 2.5in diameter hole in the top of the pipe. The incident location is a remote area without cellular phone service. The incident was initially discovered by the gas controller on duty by way of scada alarms and was immediately reported to operating personnel. The damaged pipeline segment was isolated by closing the manually operated upstream and downstream mainline valves. Upon completion of the electrical work, the final grade of the location will be raised to reach a minimum of 36in of cover. The initial nrc number is #1187585 and the 48-hr follow up number is #1187701. |
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