Incident details
Operator, cause, commodity and consequences with raw source fields.
GD incident on 2018-04-10 — CO
Operator
Public Service Co Of Colorado
Cause
Pipe, Weld, Or Joint Failure
Commodity
Natural Gas
Program
GD
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$9,774
Incident datetime
2018-04-10 08:35
Report number
Location
CO, CHAFFEE
Narrative
On 4/10/18 during the annual valve inspection of hfv-40247 the operator found natural gas readings in the valve box. During repair efforts the threaded service pipe failed at the inlet to the valve. Based on metallurgical and failure analysis by third party laboratory, the failure surface exhibits signs consistent with a brittle fracture. Dynamic loading is suspected as a possible cause, but is not conclusive. However, based on preliminary investigation the failure is not believed to be a result of direct contact with excavation equipment. Installation stress may be a contributing factor, as the connection failed when soil was removed from around the valve and service line and could have resulted in sudden movement.
Detailed record list
Occurred At
2018-04-10 08:35:00
Year
2018
Report Received Date
2018-05-10 00:00:00
Iyear
2018.0
Report Number
20180051.0
Supplemental Number
30491.0
Report Type
Supplemental 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
2018-04-10 08:35:00
Location Street Address
12445 Highway 50
Location City Name
Salida
Location County Name
Chaffee
Location State Abbreviation
CO
Location Postal Code
81201
Location Latitude
38.52153
Location Longitude
-106.10621
Nrc Rpt Datetime
2018-04-10 11:23:00
Nrc Rpt Num
1208951
Commodity Released Type
Natural Gas
Unintentional Release
85.0
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Ignite Ind
No
Explode Ind
No
Num Pub Evacuated
2.0
Incident Identified Datetime
2018-04-10 08:35:00
On Site Datetime
2018-04-10 08:35:00
Federal
No
Location Type
Utility Right-Of-Way / Easement
Incident Area Type
Underground
Incident Area Subtype
Exposed Due To Excavation
Depth Of Cover
40.0
Crossing
No
Pipe Facility Type
Investor Owned
System Part Involved
Service
Pipe Diameter
1.0
Pipe Specification
Unknown
Pipe Manufacturer
Unknown
Material Involved
Steel
Steel Seam Type
Furnace Butt Welded
Steel Seam Type Details
Furnace Butt Weld
Wt Steel
0.166
Release Type
Rupture
Rupture Orient
Circumferential
Rupture Length
0.6
Rupture Width
0.1
Class Location Type
Class 2 Location
Est Cost Oper Paid
0.0
Est Cost Prop Damage
9774.0
Est Cost Emergency
15068.0
Est Cost Other
300000.0
Est Cost Other Details
Outage Restoration
Est Cost Unintentional Release
261.0
Prpty
325103.0
Commercial Affected
456.0
Industrial Affected
0.0
Residences Affected
3461.0
Accident Psig
493.0
Normal Psig
505.0
Mop Psig
550.0
Accident Pressure
Pressure Did Not Exceed Maop
Scada In Place Ind
Yes
Scada Operating Ind
Yes
Scada Functional Ind
Yes
Scada Detection Ind
Yes
Scada Conf Ind
Yes
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
Employee was on site at time of incident. Controller merely confirmed and monitored conditions.
Employee Drug Test Ind
Yes
Num Employees Tested
1
Num Employees Failed
0
Contractor Drug Test Ind
No
Cause
Pipe, Weld, Or Joint Failure
Cause Details
Body Of Pipe
Pwjf Failure Type
Body Of Pipe
Pipe Body Subtype
Other
Pipe Body Details
Brittle Fracture
Additional Other Ind
Yes
Additional Factor Details
Dynamic Loading
Result Material Ind
Yes
Result Material Subtype
Other
Result Material Details
Unexpected Brittle Failure Under Normal Service Condiitons
Hydrotest Conducted Ind
No
Preparer Name
M*** N****
Preparer Title
Senior Engineer
Preparer Email
M**************@x*********.com
Preparer Telephone
303-571-3610
Authorizer Name
M*** N****
Authorizer Title
Principal Engineer
Authorizer Telephone
303-571-3931
Authorizer Email
M*********@x*********.com
Narrative
On 4/10/18 during the annual valve inspection of hfv-40247 the operator found natural gas readings in the valve box. During repair efforts the threaded service pipe failed at the inlet to the valve. Based on metallurgical and failure analysis by third party laboratory, the failure surface exhibits signs consistent with a brittle fracture. Dynamic loading is suspected as a possible cause, but is not conclusive. However, based on preliminary investigation the failure is not believed to be a result of direct contact with excavation equipment. Installation stress may be a contributing factor, as the connection failed when soil was removed from around the valve and service line and could have resulted in sudden movement.
| Occurred At | 2018-04-10 08:35:00 |
|---|---|
| Year | 2018 |
| Report Received Date | 2018-05-10 00:00:00 |
| Iyear | 2018.0 |
| Report Number | 20180051.0 |
| Supplemental Number | 30491.0 |
| Report Type | Supplemental 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 | 2018-04-10 08:35:00 |
| Location Street Address | 12445 Highway 50 |
| Location City Name | Salida |
| Location County Name | Chaffee |
| Location State Abbreviation | CO |
| Location Postal Code | 81201 |
| Location Latitude | 38.52153 Google Maps OpenStreetMap |
| Location Longitude | -106.10621 Google Maps OpenStreetMap |
| Nrc Rpt Datetime | 2018-04-10 11:23:00 |
| Nrc Rpt Num | 1208951 NRC Report How to search |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 85.0 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Ignite Ind | No |
| Explode Ind | No |
| Num Pub Evacuated | 2.0 |
| Incident Identified Datetime | 2018-04-10 08:35:00 |
| On Site Datetime | 2018-04-10 08:35:00 |
| Federal | No |
| Location Type | Utility Right-Of-Way / Easement |
| Incident Area Type | Underground |
| Incident Area Subtype | Exposed Due To Excavation |
| Depth Of Cover | 40.0 |
| Crossing | No |
| Pipe Facility Type | Investor Owned |
| System Part Involved | Service |
| Pipe Diameter | 1.0 |
| Pipe Specification | Unknown |
| Pipe Manufacturer | Unknown |
| Material Involved | Steel |
| Steel Seam Type | Furnace Butt Welded |
| Steel Seam Type Details | Furnace Butt Weld |
| Wt Steel | 0.166 |
| Release Type | Rupture |
| Rupture Orient | Circumferential |
| Rupture Length | 0.6 |
| Rupture Width | 0.1 |
| Class Location Type | Class 2 Location |
| Est Cost Oper Paid | 0.0 |
| Est Cost Prop Damage | 9774.0 |
| Est Cost Emergency | 15068.0 |
| Est Cost Other | 300000.0 |
| Est Cost Other Details | Outage Restoration |
| Est Cost Unintentional Release | 261.0 |
| Prpty | 325103.0 |
| Commercial Affected | 456.0 |
| Industrial Affected | 0.0 |
| Residences Affected | 3461.0 |
| Accident Psig | 493.0 |
| Normal Psig | 505.0 |
| Mop Psig | 550.0 |
| Accident Pressure | Pressure Did Not Exceed Maop |
| Scada In Place Ind | Yes |
| Scada Operating Ind | Yes |
| Scada Functional Ind | Yes |
| Scada Detection Ind | Yes |
| Scada Conf Ind | Yes |
| 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 | Employee was on site at time of incident. Controller merely confirmed and monitored conditions. |
| Employee Drug Test Ind | Yes |
| Num Employees Tested | 1 |
| Num Employees Failed | 0 |
| Contractor Drug Test Ind | No |
| Cause | Pipe, Weld, Or Joint Failure |
| Cause Details | Body Of Pipe |
| Pwjf Failure Type | Body Of Pipe |
| Pipe Body Subtype | Other |
| Pipe Body Details | Brittle Fracture |
| Additional Other Ind | Yes |
| Additional Factor Details | Dynamic Loading |
| Result Material Ind | Yes |
| Result Material Subtype | Other |
| Result Material Details | Unexpected Brittle Failure Under Normal Service Condiitons |
| Hydrotest Conducted Ind | No |
| Preparer Name | M*** N**** |
| Preparer Title | Senior Engineer |
| Preparer Email | M**************@x*********.com |
| Preparer Telephone | 303-571-3610 |
| Authorizer Name | M*** N**** |
| Authorizer Title | Principal Engineer |
| Authorizer Telephone | 303-571-3931 |
| Authorizer Email | M*********@x*********.com |
| Narrative | On 4/10/18 during the annual valve inspection of hfv-40247 the operator found natural gas readings in the valve box. During repair efforts the threaded service pipe failed at the inlet to the valve. Based on metallurgical and failure analysis by third party laboratory, the failure surface exhibits signs consistent with a brittle fracture. Dynamic loading is suspected as a possible cause, but is not conclusive. However, based on preliminary investigation the failure is not believed to be a result of direct contact with excavation equipment. Installation stress may be a contributing factor, as the connection failed when soil was removed from around the valve and service line and could have resulted in sudden movement. |
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