Incident details
Operator, cause, commodity and consequences with raw source fields.
GTG incident on 2012-11-11 — CO
Operator
Public Service Co Of Colorado
Cause
Corrosion Failure
Commodity
Natural Gas
Program
GTG
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$51,786
Incident datetime
2012-11-11 15:00
Report number
Location
CO
Narrative
On 11/11/12 at approximately 15:00 there was an unintentional release of 3,989 mcf (see part a, #10) of natural gas from an 8 inch steel transmission line, operating at 752 psig. Service was shut down at approximately 17:00 on 11/11/12 and restored on 11/12/12 at approximately 09:00. The rupture was caused by external galvanic corrosion attributed to a coating flaw (a holiday or disbonded region) that eroded wall thickness below threshold to contain operation pressure.
Detailed record list
Report Received Date
2012-12-11 00:00:00
Iyear
2012
Report Number
20120123
Supplemental Number
15894
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
2012-11-11 15:00:00
Location Latitude
39.85065
Location Longitude
-106.07956
Nrc Rpt Num
1030342
Nrc Rpt Datetime
2012-11-11 22:01:00
Commodity Released Type
Natural Gas
Unintentional Release
3989
Intentional Release
0
Accompanying Liquid
0
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Shutdown Due Accident Ind
Yes
Shutdown Datetime
2012-11-11 17:00:00
Restart Datetime
2012-11-12 09:00:00
Ignite Ind
No
Explode Ind
No
Num Pub Evacuated
0
Incident Identified Datetime
2012-11-11 15:00:00
On Site Datetime
2012-11-11 16:00:00
On Off Shore
Onshore
Onshore State Abbreviation
Co
Onshore Postal Code
80498
Onshore City Name
Silverthorne
Onshore County Name
Summit
Designated Location
Survey Station No.
Designated Name
3328+18.55
Pipe Fac Name
8" Fraser To Frisco "a"
Segment Name
Plat Sheet 82 72012
Federal
No
Location Type
Pipeline Right-Of-Way
Incident Area Type
Underground
Incident Area Subtype
Under Soil
Depth Of Cover
48
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
Longitudinal Erw - High Frequency
Pipe Manufacturer
Unknown
Pipe Coating Type
Cold Applied Tape
Installation Year
1969
Manufactured Year
1969
Material Involved
Carbon Steel
Release Type
Rupture
Rupture Orient
Longitudinal
Rupture Length
10.8
Rupture Width
4.3
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
16000
Est Cost Intentional Release
0
Est Cost Prop Damage
51786
Est Cost Emergency
0
Est Cost Other
0
Prpty
67786
Accident Psig
752
Mop Psig
790
Mop Cfr Section
Not On Omb-Approved Form When Submitted
Accident Pressure
Pressure Did Not Exceed Maop
Pressure Restriction Ind
No
Upstream Valve Type Ind
Manual
Downstream Valve Type Ind
Manual
Length Segment Isolated
43824
Internal Inspection Ind
No
Tight Mitered Ind
Yes
Other Restrictions Ind
Yes
Operation Complications Ind
Yes
Other Complications Ind
Yes
Inspect Comp Details
Valve Spacing;need For Launger/receiver
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 controllers did everything correctly.
Employee Drug Test Ind
No
Contractor Drug Test Ind
No
Cause
Corrosion Failure
Cause Details
External Corrosion
Internal External
External Corrosion
Visual Exam Results
General Corrosion
Galvanic Corrosion Ind
Yes
Metallurgical Basis Ind
Yes
Underground Location
Yes
Under Cathodic Protection Ind
Yes
Cathodic Pro Start Year
1994
Shielding Evident
Yes
Cathodic Survey Type
Yes
Other Cp Survey Ind
Yes
Other Cp Survey Year
1994
Prior Damage
Yes
Collected Data Ind
Yes
Geometry Deformation Ind
Yes
Geometry Recent Year
1994
Has Hydrtst Conduc Before Ind
No
Direct Asmnt Conducted
No
Non Destructive Exam Ind
No
Preparer Name
D**** J******
Preparer Title
Investigator - Claims Services Department
Preparer Email
D**************@x*********.com
Preparer Telephone
303-294-2552
Preparer Fax
303-294-2311
Authorizer Name
A******* G******** F** J*** J K*****
Authorizer Title
Claims Manager Managing Investigator
Authorizer Telephone
303-294-2665
Authorizer Email
J************@x*********.com
Narrative
On 11/11/12 at approximately 15:00 there was an unintentional release of 3,989 mcf (see part a, #10) of natural gas from an 8 inch steel transmission line, operating at 752 psig. Service was shut down at approximately 17:00 on 11/11/12 and restored on 11/12/12 at approximately 09:00. The rupture was caused by external galvanic corrosion attributed to a coating flaw (a holiday or disbonded region) that eroded wall thickness below threshold to contain operation pressure.
| Report Received Date | 2012-12-11 00:00:00 |
|---|---|
| Iyear | 2012 |
| Report Number | 20120123 |
| Supplemental Number | 15894 |
| 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 | 2012-11-11 15:00:00 |
| Location Latitude | 39.85065 Google Maps OpenStreetMap |
| Location Longitude | -106.07956 Google Maps OpenStreetMap |
| Nrc Rpt Num | 1030342 NRC Report How to search |
| Nrc Rpt Datetime | 2012-11-11 22:01:00 |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 3989 |
| Intentional Release | 0 |
| Accompanying Liquid | 0 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Shutdown Due Accident Ind | Yes |
| Shutdown Datetime | 2012-11-11 17:00:00 |
| Restart Datetime | 2012-11-12 09:00:00 |
| Ignite Ind | No |
| Explode Ind | No |
| Num Pub Evacuated | 0 |
| Incident Identified Datetime | 2012-11-11 15:00:00 |
| On Site Datetime | 2012-11-11 16:00:00 |
| On Off Shore | Onshore |
| Onshore State Abbreviation | Co |
| Onshore Postal Code | 80498 |
| Onshore City Name | Silverthorne |
| Onshore County Name | Summit |
| Designated Location | Survey Station No. |
| Designated Name | 3328+18.55 |
| Pipe Fac Name | 8" Fraser To Frisco "a" |
| Segment Name | Plat Sheet 82 72012 |
| Federal | No |
| Location Type | Pipeline Right-Of-Way |
| Incident Area Type | Underground |
| Incident Area Subtype | Under Soil |
| Depth Of Cover | 48 |
| 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 | Longitudinal Erw - High Frequency |
| Pipe Manufacturer | Unknown |
| Pipe Coating Type | Cold Applied Tape |
| Installation Year | 1969 |
| Manufactured Year | 1969 |
| Material Involved | Carbon Steel |
| Release Type | Rupture |
| Rupture Orient | Longitudinal |
| Rupture Length | 10.8 |
| Rupture Width | 4.3 |
| 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 | 16000 |
| Est Cost Intentional Release | 0 |
| Est Cost Prop Damage | 51786 |
| Est Cost Emergency | 0 |
| Est Cost Other | 0 |
| Prpty | 67786 |
| Accident Psig | 752 |
| Mop Psig | 790 |
| Mop Cfr Section | Not On Omb-Approved Form When Submitted 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 | 43824 |
| Internal Inspection Ind | No |
| Tight Mitered Ind | Yes |
| Other Restrictions Ind | Yes |
| Operation Complications Ind | Yes |
| Other Complications Ind | Yes |
| Inspect Comp Details | Valve Spacing;need For Launger/receiver |
| 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 controllers did everything correctly. |
| Employee Drug Test Ind | No |
| Contractor Drug Test Ind | No |
| Cause | Corrosion Failure |
| Cause Details | External Corrosion |
| Internal External | External Corrosion |
| Visual Exam Results | General Corrosion |
| Galvanic Corrosion Ind | Yes |
| Metallurgical Basis Ind | Yes |
| Underground Location | Yes |
| Under Cathodic Protection Ind | Yes |
| Cathodic Pro Start Year | 1994 |
| Shielding Evident | Yes |
| Cathodic Survey Type | Yes |
| Other Cp Survey Ind | Yes |
| Other Cp Survey Year | 1994 |
| Prior Damage | Yes |
| Collected Data Ind | Yes |
| Geometry Deformation Ind | Yes |
| Geometry Recent Year | 1994 |
| Has Hydrtst Conduc Before Ind | No |
| Direct Asmnt Conducted | No |
| Non Destructive Exam Ind | No |
| Preparer Name | D**** J****** |
| Preparer Title | Investigator - Claims Services Department |
| Preparer Email | D**************@x*********.com |
| Preparer Telephone | 303-294-2552 |
| Preparer Fax | 303-294-2311 |
| Authorizer Name | A******* G******** F** J*** J K***** |
| Authorizer Title | Claims Manager Managing Investigator |
| Authorizer Telephone | 303-294-2665 |
| Authorizer Email | J************@x*********.com |
| Narrative | On 11/11/12 at approximately 15:00 there was an unintentional release of 3,989 mcf (see part a, #10) of natural gas from an 8 inch steel transmission line, operating at 752 psig. Service was shut down at approximately 17:00 on 11/11/12 and restored on 11/12/12 at approximately 09:00. The rupture was caused by external galvanic corrosion attributed to a coating flaw (a holiday or disbonded region) that eroded wall thickness below threshold to contain operation pressure. |
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