Incident details
Operator, cause, commodity and consequences with raw source fields.
GTG incident on 2012-11-12 — OK
Operator
Oklahoma Natural Gas Co
Cause
Equipment Failure
Commodity
Natural Gas
Program
GTG
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$0
Incident datetime
2012-11-12 05:05
Report number
Location
OK
Narrative
At approximately 05:05 on november 12, 2012, oklahoma natural gas dispatch in oklahoma city received notification from the tulsa fire department of a loud noise and odor of gas in the vicinity of our transmission pipeline station near 91st & memorial road in tulsa, ok. Ong dispatch notified the operating area, which contacted employees to investigate. The first ong personnel arrived on site at approximately 06:00 and began evaluation of the conditions. It was determined that the gas release was a relief valve that was venting. Company personnel further evaluated conditions on all connecting lines within the station to determine if any overpressure situations had existed due to regulator failure. There was no regulator failure or overpressure condition. Personnel also verified their gauge readings with the gas control scada system, confirming no overpressure indications had occured on any of the lines. The ong personnel determined it would be safe to close the isolation valve below the relief valve which immediately stopped the venting at 06:40. Redundant pressure reduction and overpressure monitoring equipment was in place, so the setting in question was isolated from the system insuring there was no possibility of an overpressure due to the relief valve being isolated. The valve assembly was removed and tested at the vendor's facility under direction of ong personnel. Testing and dissasembly provided no indication of the cause. Any subsequent determinations of cause will be reported via a supplemental filing. Note regarding part a, question 18: the number of persons evacuated was estimated with informational assistance from the tulsa fire department. Part e, 5.F added "function of pipeline" information as requested by mr. Blaine keener for reports submitted on or after 1-1-2010.
Detailed record list
Report Received Date
2012-12-11 00:00:00
Iyear
2012
Report Number
20120121
Supplemental Number
15796
Report Type
Supplemental Final
Operator Id
14210
Name
Oklahoma Natural Gas Co
Operator Street Address
401 N. Harvey Ave
Operator City Name
Oklahoma City
Operator State Abbreviation
OK
Operator Postal Code
73102
Local Datetime
2012-11-12 05:05:00
Location Latitude
36.03491
Location Longitude
-95.88848
Nrc Rpt Num
1030401
Nrc Rpt Datetime
2012-11-12 14:00:00
Commodity Released Type
Natural Gas
Unintentional Release
6650
Intentional Release
0
Accompanying Liquid
0
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Shutdown Due Accident Ind
No
Shutdown Explain
Relief Valve Venting Only
Ignite Ind
No
Explode Ind
No
Num Pub Evacuated
200
Incident Identified Datetime
2012-11-12 05:05:00
On Site Datetime
2012-11-12 06:00:00
On Off Shore
Onshore
Onshore State Abbreviation
Ok
Onshore Postal Code
74133
Onshore City Name
Tulsa
Onshore County Name
Tulsa
Pipe Fac Name
91st & Memorial Road
Segment Name
Line C - South
Federal
No
Location Type
Operator-Controlled Property
Incident Area Type
Aboveground
Incident Area Subtype
Typical Aboveground Facility Piping Or Appurtenance
Crossing
No
Pipe Facility Type
Intrastate
System Part Involved
Onshore Regulator/metering Station Equipment And Piping
Item Involved
Valve
Valve Type
Relief Valve
Installation Year
2005
Material Involved
Carbon Steel
Release Type
Other
Release Type Details
Relief Valve Opened Below Set Point
Class Location Type
Class 3 Location
Could Be Hca
No
Pir Radius
147
Heat Damage Ind
No
Non Heat Damage Ind
No
Hca Fatalities Ind
No
Est Cost Oper Paid
0
Est Cost Unintentional Release
34720
Est Cost Intentional Release
0
Est Cost Prop Damage
0
Est Cost Emergency
300
Est Cost Other
0
Prpty
35020
Accident Psig
248
Mop Psig
300
Mop Cfr Section
Not On Omb-Approved Form When Submitted
Accident Pressure
Pressure Did Not Exceed Maop
Pressure Restriction Ind
No
Pipeline Function
Transmission Line Of Distribution System
Scada In Place Ind
Yes
Scada Operating Ind
Yes
Scada Functional Ind
Yes
Scada Detection Ind
No
Scada Conf Ind
Yes
Accident Identifier
Notification From Emergency Responder
Investigation Status
Yes, specify investigation result(s): (select all that apply)
Invest Schedule Ind
Yes
Invest No Control Room Ind
Yes
Invest No Controller Ind
Yes
Employee Drug Test Ind
Yes
Contractor Drug Test Ind
No
Num Employees Tested
1
Num Employees Failed
0
Cause
Equipment Failure
Cause Details
Malfunction Of Control/relief Equipment
Eq Failure Type
Malfunction Of Control/relief Equipment
Relief Valve Ind
Yes
Eq Additional Other Ind
Yes
Eq Additional Other Details
No Defects Identified
Preparer Name
R***** S*******
Preparer Title
Regional Operations Engineer
Preparer Email
R********@o****.com
Preparer Telephone
918-831-8215
Authorizer Name
B**** B*******
Authorizer Title
Director - Division Operations
Authorizer Telephone
405-551-6653
Authorizer Email
B********@o**.com
Narrative
At approximately 05:05 on november 12, 2012, oklahoma natural gas dispatch in oklahoma city received notification from the tulsa fire department of a loud noise and odor of gas in the vicinity of our transmission pipeline station near 91st & memorial road in tulsa, ok. Ong dispatch notified the operating area, which contacted employees to investigate. The first ong personnel arrived on site at approximately 06:00 and began evaluation of the conditions. It was determined that the gas release was a relief valve that was venting. Company personnel further evaluated conditions on all connecting lines within the station to determine if any overpressure situations had existed due to regulator failure. There was no regulator failure or overpressure condition. Personnel also verified their gauge readings with the gas control scada system, confirming no overpressure indications had occured on any of the lines. The ong personnel determined it would be safe to close the isolation valve below the relief valve which immediately stopped the venting at 06:40. Redundant pressure reduction and overpressure monitoring equipment was in place, so the setting in question was isolated from the system insuring there was no possibility of an overpressure due to the relief valve being isolated. The valve assembly was removed and tested at the vendor's facility under direction of ong personnel. Testing and dissasembly provided no indication of the cause. Any subsequent determinations of cause will be reported via a supplemental filing. Note regarding part a, question 18: the number of persons evacuated was estimated with informational assistance from the tulsa fire department. Part e, 5.F added "function of pipeline" information as requested by mr. Blaine keener for reports submitted on or after 1-1-2010.
| Report Received Date | 2012-12-11 00:00:00 |
|---|---|
| Iyear | 2012 |
| Report Number | 20120121 |
| Supplemental Number | 15796 |
| Report Type | Supplemental Final |
| Operator Id | 14210 PHMSA Enforcement |
| Name | Oklahoma Natural Gas Co |
| Operator Street Address | 401 N. Harvey Ave |
| Operator City Name | Oklahoma City |
| Operator State Abbreviation | OK |
| Operator Postal Code | 73102 |
| Local Datetime | 2012-11-12 05:05:00 |
| Location Latitude | 36.03491 Google Maps OpenStreetMap |
| Location Longitude | -95.88848 Google Maps OpenStreetMap |
| Nrc Rpt Num | 1030401 NRC Report How to search |
| Nrc Rpt Datetime | 2012-11-12 14:00:00 |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 6650 |
| Intentional Release | 0 |
| Accompanying Liquid | 0 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Shutdown Due Accident Ind | No |
| Shutdown Explain | Relief Valve Venting Only |
| Ignite Ind | No |
| Explode Ind | No |
| Num Pub Evacuated | 200 |
| Incident Identified Datetime | 2012-11-12 05:05:00 |
| On Site Datetime | 2012-11-12 06:00:00 |
| On Off Shore | Onshore |
| Onshore State Abbreviation | Ok |
| Onshore Postal Code | 74133 |
| Onshore City Name | Tulsa |
| Onshore County Name | Tulsa |
| Pipe Fac Name | 91st & Memorial Road |
| Segment Name | Line C - South |
| Federal | No |
| Location Type | Operator-Controlled Property |
| Incident Area Type | Aboveground |
| Incident Area Subtype | Typical Aboveground Facility Piping Or Appurtenance |
| Crossing | No |
| Pipe Facility Type | Intrastate |
| System Part Involved | Onshore Regulator/metering Station Equipment And Piping |
| Item Involved | Valve |
| Valve Type | Relief Valve |
| Installation Year | 2005 |
| Material Involved | Carbon Steel |
| Release Type | Other |
| Release Type Details | Relief Valve Opened Below Set Point |
| Class Location Type | Class 3 Location |
| Could Be Hca | No |
| Pir Radius | 147 |
| Heat Damage Ind | No |
| Non Heat Damage Ind | No |
| Hca Fatalities Ind | No |
| Est Cost Oper Paid | 0 |
| Est Cost Unintentional Release | 34720 |
| Est Cost Intentional Release | 0 |
| Est Cost Prop Damage | 0 |
| Est Cost Emergency | 300 |
| Est Cost Other | 0 |
| Prpty | 35020 |
| Accident Psig | 248 |
| Mop Psig | 300 |
| 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 Line Of Distribution System |
| Scada In Place Ind | Yes |
| Scada Operating Ind | Yes |
| Scada Functional Ind | Yes |
| Scada Detection Ind | No |
| Scada Conf Ind | Yes |
| Accident Identifier | Notification From Emergency Responder |
| Investigation Status | Yes, specify investigation result(s): (select all that apply) |
| Invest Schedule Ind | Yes |
| Invest No Control Room Ind | Yes |
| Invest No Controller Ind | Yes |
| Employee Drug Test Ind | Yes |
| Contractor Drug Test Ind | No |
| Num Employees Tested | 1 |
| Num Employees Failed | 0 |
| Cause | Equipment Failure |
| Cause Details | Malfunction Of Control/relief Equipment |
| Eq Failure Type | Malfunction Of Control/relief Equipment |
| Relief Valve Ind | Yes |
| Eq Additional Other Ind | Yes |
| Eq Additional Other Details | No Defects Identified |
| Preparer Name | R***** S******* |
| Preparer Title | Regional Operations Engineer |
| Preparer Email | R********@o****.com |
| Preparer Telephone | 918-831-8215 |
| Authorizer Name | B**** B******* |
| Authorizer Title | Director - Division Operations |
| Authorizer Telephone | 405-551-6653 |
| Authorizer Email | B********@o**.com |
| Narrative | At approximately 05:05 on november 12, 2012, oklahoma natural gas dispatch in oklahoma city received notification from the tulsa fire department of a loud noise and odor of gas in the vicinity of our transmission pipeline station near 91st & memorial road in tulsa, ok. Ong dispatch notified the operating area, which contacted employees to investigate. The first ong personnel arrived on site at approximately 06:00 and began evaluation of the conditions. It was determined that the gas release was a relief valve that was venting. Company personnel further evaluated conditions on all connecting lines within the station to determine if any overpressure situations had existed due to regulator failure. There was no regulator failure or overpressure condition. Personnel also verified their gauge readings with the gas control scada system, confirming no overpressure indications had occured on any of the lines. The ong personnel determined it would be safe to close the isolation valve below the relief valve which immediately stopped the venting at 06:40. Redundant pressure reduction and overpressure monitoring equipment was in place, so the setting in question was isolated from the system insuring there was no possibility of an overpressure due to the relief valve being isolated. The valve assembly was removed and tested at the vendor's facility under direction of ong personnel. Testing and dissasembly provided no indication of the cause. Any subsequent determinations of cause will be reported via a supplemental filing. Note regarding part a, question 18: the number of persons evacuated was estimated with informational assistance from the tulsa fire department. Part e, 5.F added "function of pipeline" information as requested by mr. Blaine keener for reports submitted on or after 1-1-2010. |
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