Incident details
Operator, cause, commodity and consequences with raw source fields.
GTG incident on 2011-04-27 — UT
Operator
Northwest Pipeline Corp (Wgp)
Cause
Equipment Failure
Commodity
Natural Gas
Program
GTG
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$81,000
Incident datetime
2011-04-27 13:20
Report number
Location
UT
Narrative
Williams (northwest pipeline) identified a 2" threaded tap valve that was not sealing properly during regular maintenance. The 2" pipeline comes off of the 22" mainline in idaho state and feeds a single home. After analyzing the situation, williams feels that the best approach is to remove the 2" tap valve. To accomplish this task, williams isolate the segment of 22" mainline pipe, blew down the mainline, isolate the 2" pipeline and cut out the section of mainline that contains the 2" tap. Instead of a small pup to accomodate the cut out, a full joint of new 22" pipe was installed in the mainline to eliminate three composite sleeves found during the excavation of the pipe while the pipe was out of service. The customer was transfered onto another available service.
Detailed record list
Report Received Date
2011-06-03 00:00:00
Iyear
2011
Report Number
20110166
Supplemental Number
16242
Report Type
Supplemental Final
Operator Id
13845
Name
Northwest Pipeline Corp (Wgp)
Operator Street Address
295 Chipeta Way
Operator City Name
Salt Lake City
Operator State Abbreviation
UT
Operator Postal Code
84108
Local Datetime
2011-04-27 13:20:00
Location Latitude
42.62763932
Location Longitude
-111.8379104
Nrc Rpt Num
974628
Nrc Rpt Datetime
2011-05-02 12:55:00
Commodity Released Type
Natural Gas
Unintentional Release
29
Intentional Release
12913
Accompanying Liquid
0
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Shutdown Due Accident Ind
No
Shutdown Explain
Not Immediately, Small Farm Tap Leak. Threaded Fitting Leaked.
Ignite Ind
No
Explode Ind
No
Num Pub Evacuated
0
Incident Identified Datetime
2011-04-27 13:20:00
On Site Datetime
2011-04-27 13:20:00
On Off Shore
Onshore
Onshore State Abbreviation
Id
Onshore Postal Code
83241
Onshore County Name
Caribou
Designated Location
Milepost
Designated Name
553.48
Pipe Fac Name
1400 Line
Segment Name
1400 Line
Federal
No
Location Type
Operator-Controlled Property
Incident Area Type
Underground
Incident Area Subtype
In Underground Enclosed Space (E.g. Vault)
Crossing
No
Pipe Facility Type
Interstate
System Part Involved
Onshore Pipeline, Including Valve Sites
Item Involved
Other
Item Involved Details
Threaded 2" Pipe, Part Of The Farm Tap.
Installation Year
1961
Material Involved
Carbon Steel
Release Type
Leak
Leak Type
Connection Failure
Class Location Type
Class 1 Location
Could Be Hca
No
Pir Radius
40
Heat Damage Ind
No
Non Heat Damage Ind
No
Hca Fatalities Ind
No
Est Cost Oper Paid
0
Est Cost Unintentional Release
117
Est Cost Intentional Release
52964
Est Cost Prop Damage
81000
Est Cost Emergency
0
Est Cost Other
0
Prpty
134081
Accident Psig
708
Mop Psig
850
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
87869
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
No
Scada Conf Ind
No
Accident Identifier
Other
Accident Details
Discovered During Scheduled Maintenance At Site By Operator.
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
Farm tap that was not monitored in scada
Employee Drug Test Ind
No
Contractor Drug Test Ind
No
Cause
Equipment Failure
Cause Details
Threaded Connection/coupling Failure
Eq Failure Type
Threaded Connection/coupling Failure
Other Stripped Ind
Threaded Fitting
Additional Installation Ind
Yes
Preparer Name
B*** S****
Preparer Title
Sr. Tech. Spec.
Preparer Email
B*********@w*******.com
Preparer Telephone
801-584-6741
Authorizer Name
J**** E********
Authorizer Title
Manager Pipeline Safety
Authorizer Telephone
801-584-6539
Authorizer Email
J**************@w*******.com
Narrative
Williams (northwest pipeline) identified a 2" threaded tap valve that was not sealing properly during regular maintenance. The 2" pipeline comes off of the 22" mainline in idaho state and feeds a single home. After analyzing the situation, williams feels that the best approach is to remove the 2" tap valve. To accomplish this task, williams isolate the segment of 22" mainline pipe, blew down the mainline, isolate the 2" pipeline and cut out the section of mainline that contains the 2" tap. Instead of a small pup to accomodate the cut out, a full joint of new 22" pipe was installed in the mainline to eliminate three composite sleeves found during the excavation of the pipe while the pipe was out of service. The customer was transfered onto another available service.
| Report Received Date | 2011-06-03 00:00:00 |
|---|---|
| Iyear | 2011 |
| Report Number | 20110166 |
| Supplemental Number | 16242 |
| Report Type | Supplemental Final |
| Operator Id | 13845 PHMSA Enforcement |
| Name | Northwest Pipeline Corp (Wgp) |
| Operator Street Address | 295 Chipeta Way |
| Operator City Name | Salt Lake City |
| Operator State Abbreviation | UT |
| Operator Postal Code | 84108 |
| Local Datetime | 2011-04-27 13:20:00 |
| Location Latitude | 42.62763932 Google Maps OpenStreetMap |
| Location Longitude | -111.8379104 Google Maps OpenStreetMap |
| Nrc Rpt Num | 974628 NRC Report How to search |
| Nrc Rpt Datetime | 2011-05-02 12:55:00 |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 29 |
| Intentional Release | 12913 |
| Accompanying Liquid | 0 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Shutdown Due Accident Ind | No |
| Shutdown Explain | Not Immediately, Small Farm Tap Leak. Threaded Fitting Leaked. |
| Ignite Ind | No |
| Explode Ind | No |
| Num Pub Evacuated | 0 |
| Incident Identified Datetime | 2011-04-27 13:20:00 |
| On Site Datetime | 2011-04-27 13:20:00 |
| On Off Shore | Onshore |
| Onshore State Abbreviation | Id |
| Onshore Postal Code | 83241 |
| Onshore County Name | Caribou |
| Designated Location | Milepost |
| Designated Name | 553.48 |
| Pipe Fac Name | 1400 Line |
| Segment Name | 1400 Line |
| Federal | No |
| Location Type | Operator-Controlled Property |
| Incident Area Type | Underground |
| Incident Area Subtype | In Underground Enclosed Space (E.g. Vault) |
| Crossing | No |
| Pipe Facility Type | Interstate |
| System Part Involved | Onshore Pipeline, Including Valve Sites |
| Item Involved | Other |
| Item Involved Details | Threaded 2" Pipe, Part Of The Farm Tap. |
| Installation Year | 1961 |
| Material Involved | Carbon Steel |
| Release Type | Leak |
| Leak Type | Connection Failure |
| Class Location Type | Class 1 Location |
| Could Be Hca | No |
| Pir Radius | 40 |
| Heat Damage Ind | No |
| Non Heat Damage Ind | No |
| Hca Fatalities Ind | No |
| Est Cost Oper Paid | 0 |
| Est Cost Unintentional Release | 117 |
| Est Cost Intentional Release | 52964 |
| Est Cost Prop Damage | 81000 |
| Est Cost Emergency | 0 |
| Est Cost Other | 0 |
| Prpty | 134081 |
| Accident Psig | 708 |
| Mop Psig | 850 |
| 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 | 87869 |
| 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 | No |
| Scada Conf Ind | No |
| Accident Identifier | Other |
| Accident Details | Discovered During Scheduled Maintenance At Site By Operator. |
| 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 | Farm tap that was not monitored in scada |
| Employee Drug Test Ind | No |
| Contractor Drug Test Ind | No |
| Cause | Equipment Failure |
| Cause Details | Threaded Connection/coupling Failure |
| Eq Failure Type | Threaded Connection/coupling Failure |
| Other Stripped Ind | Threaded Fitting |
| Additional Installation Ind | Yes |
| Preparer Name | B*** S**** |
| Preparer Title | Sr. Tech. Spec. |
| Preparer Email | B*********@w*******.com |
| Preparer Telephone | 801-584-6741 |
| Authorizer Name | J**** E******** |
| Authorizer Title | Manager Pipeline Safety |
| Authorizer Telephone | 801-584-6539 |
| Authorizer Email | J**************@w*******.com |
| Narrative | Williams (northwest pipeline) identified a 2" threaded tap valve that was not sealing properly during regular maintenance. The 2" pipeline comes off of the 22" mainline in idaho state and feeds a single home. After analyzing the situation, williams feels that the best approach is to remove the 2" tap valve. To accomplish this task, williams isolate the segment of 22" mainline pipe, blew down the mainline, isolate the 2" pipeline and cut out the section of mainline that contains the 2" tap. Instead of a small pup to accomodate the cut out, a full joint of new 22" pipe was installed in the mainline to eliminate three composite sleeves found during the excavation of the pipe while the pipe was out of service. The customer was transfered onto another available service. |
External Resources
PHMSA pipeline safety insights.
Product
Features
Company
All rights reserved. Copyright © by ClearPHMSA