Incident details
Operator, cause, commodity and consequences with raw source fields.
GTG incident on 2011-11-30 — OK
Operator
Questar Pipeline Company
Cause
Equipment Failure
Commodity
Natural Gas
Program
GTG
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$500
Incident datetime
2011-11-30 16:10
Report number
Location
OK
Narrative
Supplemental being filed to clarify the cause of the incident. Tubing for a sensing line to a pressure transducer was inadequately secured during initial installation and broke free from its connection point because of prolonged vibration from normal operation. Local operator responded and isolated the sensing line valves. The operator repaired the tubing and reported the event to questar pipeline company's gas control. After gas loss calculations were made it was determined that this event met the criteria of an unintentional release of gas in excess of 3 mmscf and the event was reported to the nrc.
Detailed record list
Report Received Date
2011-12-26 00:00:00
Iyear
2011
Report Number
20110398
Supplemental Number
16073
Report Type
Supplemental Final
Operator Id
12874
Name
Questar Pipeline Company
Operator Street Address
One Williams Center
Operator City Name
Tulsa
Operator State Abbreviation
OK
Operator Postal Code
74172
Local Datetime
2011-11-27 13:10:00
Location Latitude
41.491675
Location Longitude
-110.275432
Nrc Rpt Num
996959
Nrc Rpt Datetime
2011-12-01 16:54:00
Commodity Released Type
Natural Gas
Unintentional Release
5400
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Shutdown Due Accident Ind
No
Shutdown Explain
Sensing Line Tubing Was Isolated And Repaired
Ignite Ind
No
Explode Ind
No
Num Pub Evacuated
0
Incident Identified Datetime
2011-11-30 16:10:00
On Site Datetime
2011-11-30 16:10:00
On Off Shore
Onshore
Onshore State Abbreviation
Wy
Onshore Postal Code
82937
Onshore City Name
Near Lyman
Onshore County Name
Uinta
Designated Location
Milepost
Designated Name
Mp 3.9
Pipe Fac Name
Tl90 Interconnect With Ml116
Segment Name
Overthrust
Federal
Yes
Location Type
Pipeline Right-Of-Way
Incident Area Type
Aboveground
Incident Area Subtype
Typical Aboveground Facility Piping Or Appurtenance
Crossing
No
Pipe Facility Type
Interstate
System Part Involved
Onshore Regulator/metering Station Equipment And Piping
Item Involved
Tubing
Installation Year
2002
Material Involved
Material Other Than Carbon Steel Or Plastic
Material Details
Stainless Steel Tubing
Release Type
Other
Release Type Details
Tubing Broke Off From Needle Valve On A Sensing Line For A Pressure Transducer
Class Location Type
Class 1 Location
Could Be Hca
No
Pir Radius
7
Heat Damage Ind
No
Non Heat Damage Ind
No
Hca Fatalities Ind
No
Est Cost Oper Paid
0
Est Cost Unintentional Release
19500
Est Cost Intentional Release
0
Est Cost Prop Damage
500
Est Cost Emergency
300
Est Cost Other
0
Prpty
20300
Accident Psig
945
Mop Psig
1305
Mop Cfr Section
Not On Omb-Approved Form When Submitted
Accident Pressure
Pressure Did Not Exceed Maop
Pressure Restriction 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
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
Event was not significant enough to cause an alarm
Employee Drug Test Ind
No
Contractor Drug Test Ind
No
Cause
Equipment Failure
Cause Details
Other Equipment Failure
Eq Failure Type
Other Equipment Failure
Eq Failure Details
Sensing Line Tubing Broke Downstream Of Its Connecting Needle Valve. The Cause Of The Break Was Due To Prolonged Vibration From Normal Operation And The Tubing Being Inadequately Secured Or Supported To The Larger. Piping.
Additional Installation Ind
Yes
Preparer Name
C*** W******
Preparer Title
Supervisor Of Pipeline Compliance
Preparer Email
C***********@q******.com
Preparer Telephone
801-324-3814
Authorizer Name
L**** C****
Authorizer Title
Vice President Of Engineering And Operations
Authorizer Telephone
801-324-5061
Authorizer Email
L**********@q******.com
Narrative
Supplemental being filed to clarify the cause of the incident. Tubing for a sensing line to a pressure transducer was inadequately secured during initial installation and broke free from its connection point because of prolonged vibration from normal operation. Local operator responded and isolated the sensing line valves. The operator repaired the tubing and reported the event to questar pipeline company's gas control. After gas loss calculations were made it was determined that this event met the criteria of an unintentional release of gas in excess of 3 mmscf and the event was reported to the nrc.
| Report Received Date | 2011-12-26 00:00:00 |
|---|---|
| Iyear | 2011 |
| Report Number | 20110398 |
| Supplemental Number | 16073 |
| Report Type | Supplemental Final |
| Operator Id | 12874 PHMSA Enforcement |
| Name | Questar Pipeline Company |
| Operator Street Address | One Williams Center |
| Operator City Name | Tulsa |
| Operator State Abbreviation | OK |
| Operator Postal Code | 74172 |
| Local Datetime | 2011-11-27 13:10:00 |
| Location Latitude | 41.491675 Google Maps OpenStreetMap |
| Location Longitude | -110.275432 Google Maps OpenStreetMap |
| Nrc Rpt Num | 996959 NRC Report How to search |
| Nrc Rpt Datetime | 2011-12-01 16:54:00 |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 5400 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Shutdown Due Accident Ind | No |
| Shutdown Explain | Sensing Line Tubing Was Isolated And Repaired |
| Ignite Ind | No |
| Explode Ind | No |
| Num Pub Evacuated | 0 |
| Incident Identified Datetime | 2011-11-30 16:10:00 |
| On Site Datetime | 2011-11-30 16:10:00 |
| On Off Shore | Onshore |
| Onshore State Abbreviation | Wy |
| Onshore Postal Code | 82937 |
| Onshore City Name | Near Lyman |
| Onshore County Name | Uinta |
| Designated Location | Milepost |
| Designated Name | Mp 3.9 |
| Pipe Fac Name | Tl90 Interconnect With Ml116 |
| Segment Name | Overthrust |
| Federal | Yes |
| Location Type | Pipeline Right-Of-Way |
| Incident Area Type | Aboveground |
| Incident Area Subtype | Typical Aboveground Facility Piping Or Appurtenance |
| Crossing | No |
| Pipe Facility Type | Interstate |
| System Part Involved | Onshore Regulator/metering Station Equipment And Piping |
| Item Involved | Tubing |
| Installation Year | 2002 |
| Material Involved | Material Other Than Carbon Steel Or Plastic |
| Material Details | Stainless Steel Tubing |
| Release Type | Other |
| Release Type Details | Tubing Broke Off From Needle Valve On A Sensing Line For A Pressure Transducer |
| Class Location Type | Class 1 Location |
| Could Be Hca | No |
| Pir Radius | 7 |
| Heat Damage Ind | No |
| Non Heat Damage Ind | No |
| Hca Fatalities Ind | No |
| Est Cost Oper Paid | 0 |
| Est Cost Unintentional Release | 19500 |
| Est Cost Intentional Release | 0 |
| Est Cost Prop Damage | 500 |
| Est Cost Emergency | 300 |
| Est Cost Other | 0 |
| Prpty | 20300 |
| Accident Psig | 945 |
| Mop Psig | 1305 |
| 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 |
| Pipeline Function | Transmission System |
| Scada In Place Ind | Yes |
| Scada Operating Ind | Yes |
| Scada Functional Ind | Yes |
| Scada Detection Ind | No |
| 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 | Event was not significant enough to cause an alarm |
| Employee Drug Test Ind | No |
| Contractor Drug Test Ind | No |
| Cause | Equipment Failure |
| Cause Details | Other Equipment Failure |
| Eq Failure Type | Other Equipment Failure |
| Eq Failure Details | Sensing Line Tubing Broke Downstream Of Its Connecting Needle Valve. The Cause Of The Break Was Due To Prolonged Vibration From Normal Operation And The Tubing Being Inadequately Secured Or Supported To The Larger. Piping. |
| Additional Installation Ind | Yes |
| Preparer Name | C*** W****** |
| Preparer Title | Supervisor Of Pipeline Compliance |
| Preparer Email | C***********@q******.com |
| Preparer Telephone | 801-324-3814 |
| Authorizer Name | L**** C**** |
| Authorizer Title | Vice President Of Engineering And Operations |
| Authorizer Telephone | 801-324-5061 |
| Authorizer Email | L**********@q******.com |
| Narrative | Supplemental being filed to clarify the cause of the incident. Tubing for a sensing line to a pressure transducer was inadequately secured during initial installation and broke free from its connection point because of prolonged vibration from normal operation. Local operator responded and isolated the sensing line valves. The operator repaired the tubing and reported the event to questar pipeline company's gas control. After gas loss calculations were made it was determined that this event met the criteria of an unintentional release of gas in excess of 3 mmscf and the event was reported to the nrc. |
External Resources
PHMSA pipeline safety insights.
Product
Features
Company
All rights reserved. Copyright © by ClearPHMSA