Incident details
Operator, cause, commodity and consequences with raw source fields.
GTG incident on 2013-03-14 — TX
Operator
Gas Transmission Northwest Llc
Cause
Equipment Failure
Commodity
Natural Gas
Program
GTG
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$313,000
Incident datetime
2013-03-14 17:05
Report number
Location
TX
Narrative
The landowner reported an area of dead vegetation over the pipeline. Pipeline personnel detected gas in a probe hole over the pipeline, but not in the air above ground. The pipeline section was isolated and pressure reduced to 125 psig. The area was excavated and a branch connection was found. The 2" branch connection had a pipe cap and the leak was found at the threads of the pipe cap. The cause of the leakage past the threads of the fitting is unknown, but the fitting was not broken. The pipeline was vented to near atmospheric pressure. The branch connection was sandblasted and threaded connection was seal-welded. The pipeline was put back in operation and the exposed pipe was recoated and backfilled.
Detailed record list
Report Received Date
2013-04-12 00:00:00
Iyear
2013
Report Number
20130032
Supplemental Number
15980
Report Type
Supplemental Final
Operator Id
15014
Name
Gas Transmission Northwest Llc
Operator Street Address
700 Louisiana Street Suite 700
Operator City Name
Houston
Operator State Abbreviation
TX
Operator Postal Code
77002
Local Datetime
2013-03-14 17:05:00
Location Latitude
46.855857
Location Longitude
-117.809636
Nrc Rpt Num
1041089
Nrc Rpt Datetime
2013-03-14 17:44:00
Commodity Released Type
Natural Gas
Unintentional Release
1
Intentional Release
52616
Accompanying Liquid
0
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Shutdown Due Accident Ind
Yes
Shutdown Datetime
2013-03-14 21:15:00
Restart Datetime
2013-03-21 14:20:00
Ignite Ind
No
Explode Ind
No
Num Pub Evacuated
0
Incident Identified Datetime
2013-03-14 17:05:00
On Site Datetime
2013-03-14 17:05:00
On Off Shore
Onshore
Onshore State Abbreviation
Wa
Onshore Postal Code
99143
Onshore City Name
Lacrosse
Onshore County Name
Whitman
Designated Location
Milepost
Designated Name
179.3
Pipe Fac Name
B-Line
Segment Name
Mlv 6-2
Federal
No
Location Type
Pipeline Right-Of-Way
Incident Area Type
Underground
Incident Area Subtype
Under Soil
Depth Of Cover
72
Crossing
No
Pipe Facility Type
Interstate
System Part Involved
Onshore Pipeline, Including Valve Sites
Item Involved
Drain Lines
Installation Year
1992
Material Involved
Carbon Steel
Release Type
Leak
Leak Type
Seal Or Packing
Class Location Type
Class 1 Location
Could Be Hca
No
Pir Radius
935
Heat Damage Ind
No
Non Heat Damage Ind
No
Hca Fatalities Ind
No
Est Cost Oper Paid
25000
Est Cost Unintentional Release
4
Est Cost Intentional Release
204007
Est Cost Prop Damage
313000
Est Cost Emergency
2019
Est Cost Other
0
Prpty
544030
Accident Psig
860
Mop Psig
911
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
99175
Internal Inspection Ind
No
Diameter Change 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
Notification From Public
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
Leak was a threaded fitting not affected by control room activity.
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
Eq Additional Other Ind
Yes
Eq Additional Other Details
Cause Of Leak Past Threads Is Unknown, But The Fitting Did Not Break.
Preparer Name
K*** S****
Preparer Title
Compliance Specialist
Preparer Email
K*********@t**********.com
Preparer Telephone
(509) 546-8865
Preparer Fax
(509) 546-8825
Authorizer Name
K*** S****
Authorizer Title
Compliance Specialist
Authorizer Telephone
(509) 546-8865
Authorizer Email
K*********@t**********.com
Narrative
The landowner reported an area of dead vegetation over the pipeline. Pipeline personnel detected gas in a probe hole over the pipeline, but not in the air above ground. The pipeline section was isolated and pressure reduced to 125 psig. The area was excavated and a branch connection was found. The 2" branch connection had a pipe cap and the leak was found at the threads of the pipe cap. The cause of the leakage past the threads of the fitting is unknown, but the fitting was not broken. The pipeline was vented to near atmospheric pressure. The branch connection was sandblasted and threaded connection was seal-welded. The pipeline was put back in operation and the exposed pipe was recoated and backfilled.
| Report Received Date | 2013-04-12 00:00:00 |
|---|---|
| Iyear | 2013 |
| Report Number | 20130032 |
| Supplemental Number | 15980 |
| Report Type | Supplemental Final |
| Operator Id | 15014 PHMSA Enforcement |
| Name | Gas Transmission Northwest Llc |
| Operator Street Address | 700 Louisiana Street Suite 700 |
| Operator City Name | Houston |
| Operator State Abbreviation | TX |
| Operator Postal Code | 77002 |
| Local Datetime | 2013-03-14 17:05:00 |
| Location Latitude | 46.855857 Google Maps OpenStreetMap |
| Location Longitude | -117.809636 Google Maps OpenStreetMap |
| Nrc Rpt Num | 1041089 NRC Report How to search |
| Nrc Rpt Datetime | 2013-03-14 17:44:00 |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 1 |
| Intentional Release | 52616 |
| Accompanying Liquid | 0 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Shutdown Due Accident Ind | Yes |
| Shutdown Datetime | 2013-03-14 21:15:00 |
| Restart Datetime | 2013-03-21 14:20:00 |
| Ignite Ind | No |
| Explode Ind | No |
| Num Pub Evacuated | 0 |
| Incident Identified Datetime | 2013-03-14 17:05:00 |
| On Site Datetime | 2013-03-14 17:05:00 |
| On Off Shore | Onshore |
| Onshore State Abbreviation | Wa |
| Onshore Postal Code | 99143 |
| Onshore City Name | Lacrosse |
| Onshore County Name | Whitman |
| Designated Location | Milepost |
| Designated Name | 179.3 |
| Pipe Fac Name | B-Line |
| Segment Name | Mlv 6-2 |
| Federal | No |
| Location Type | Pipeline Right-Of-Way |
| Incident Area Type | Underground |
| Incident Area Subtype | Under Soil |
| Depth Of Cover | 72 |
| Crossing | No |
| Pipe Facility Type | Interstate |
| System Part Involved | Onshore Pipeline, Including Valve Sites |
| Item Involved | Drain Lines |
| Installation Year | 1992 |
| Material Involved | Carbon Steel |
| Release Type | Leak |
| Leak Type | Seal Or Packing |
| Class Location Type | Class 1 Location |
| Could Be Hca | No |
| Pir Radius | 935 |
| Heat Damage Ind | No |
| Non Heat Damage Ind | No |
| Hca Fatalities Ind | No |
| Est Cost Oper Paid | 25000 |
| Est Cost Unintentional Release | 4 |
| Est Cost Intentional Release | 204007 |
| Est Cost Prop Damage | 313000 |
| Est Cost Emergency | 2019 |
| Est Cost Other | 0 |
| Prpty | 544030 |
| Accident Psig | 860 |
| Mop Psig | 911 |
| 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 | 99175 |
| Internal Inspection Ind | No |
| Diameter Change 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 | Notification From Public |
| 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 | Leak was a threaded fitting not affected by control room activity. |
| 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 |
| Eq Additional Other Ind | Yes |
| Eq Additional Other Details | Cause Of Leak Past Threads Is Unknown, But The Fitting Did Not Break. |
| Preparer Name | K*** S**** |
| Preparer Title | Compliance Specialist |
| Preparer Email | K*********@t**********.com |
| Preparer Telephone | (509) 546-8865 |
| Preparer Fax | (509) 546-8825 |
| Authorizer Name | K*** S**** |
| Authorizer Title | Compliance Specialist |
| Authorizer Telephone | (509) 546-8865 |
| Authorizer Email | K*********@t**********.com |
| Narrative | The landowner reported an area of dead vegetation over the pipeline. Pipeline personnel detected gas in a probe hole over the pipeline, but not in the air above ground. The pipeline section was isolated and pressure reduced to 125 psig. The area was excavated and a branch connection was found. The 2" branch connection had a pipe cap and the leak was found at the threads of the pipe cap. The cause of the leakage past the threads of the fitting is unknown, but the fitting was not broken. The pipeline was vented to near atmospheric pressure. The branch connection was sandblasted and threaded connection was seal-welded. The pipeline was put back in operation and the exposed pipe was recoated and backfilled. |
External Resources
PHMSA pipeline safety insights.
Product
Features
Company
All rights reserved. Copyright © by ClearPHMSA