Incident details
Operator, cause, commodity and consequences with raw source fields.
GTG incident on 2012-05-10 — TX
Operator
Columbia Gulf Transmission Co
Cause
Equipment Failure
Commodity
Natural Gas
Program
GTG
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$500
Incident datetime
2012-05-10 07:10
Report number
Location
TX
Narrative
Shortly after 5:30 am on 5/10/2012 a columbia gulf transmission employee received a call from a person living near our clementsville compressor station. The call informed the employee that the station was making a noise. The employee arrived on site shortly after 6:00 am and heard gas venting. By 6:30 the problem had been isolated to a malfunctioning relief valve. A second relief valve was present in this section of piping, so the malfunctioning valve was closed. The station resumed normal operations. By 7:00, a quick review of operating parameters was underway. Before 7:30 it was determined that over 3000 mcf of gas had likely been released. A call was made to the nrc by a few minutes after 8:00. Later that day it was determined that a connection in the tubing that supplied signal gas to the relief valve had failed. This had caused the relief valve to open at a pressure significantly below the maop. The connection was replaced with a different style connection at this location and other similar locations. Note on part a question 19a and 19b: company personnel actually arrived on site before it was determined that an incident had occurred. However the electronic version of this form does not seem to allow that sequence of events to be input. Reference the above narrative.
Detailed record list
Report Received Date
2012-06-09 00:00:00
Iyear
2012
Report Number
20120059
Supplemental Number
16348
Report Type
Supplemental Final
Operator Id
2620
Name
Columbia Gulf Transmission Co
Operator Street Address
700 Louisiana St. Suite 700
Operator City Name
Houston
Operator State Abbreviation
TX
Operator Postal Code
77002
Local Datetime
2012-05-10 06:32:00
Location Latitude
37.31
Location Longitude
-85.061136
Nrc Rpt Num
1011062
Nrc Rpt Datetime
2012-05-10 08:10:00
Commodity Released Type
Natural Gas
Unintentional Release
17032
Intentional Release
17033
Accompanying Liquid
0
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Shutdown Due Accident Ind
No
Shutdown Explain
Malfunctioing Relief Valve. Facility Lost Some Pressure But Remained In Service
Ignite Ind
No
Explode Ind
No
Num Pub Evacuated
0
Incident Identified Datetime
2012-05-10 07:10:00
On Site Datetime
2012-05-10 07:10:00
On Off Shore
Onshore
Onshore State Abbreviation
Ky
Onshore Postal Code
42539
Onshore City Name
Liberty
Onshore County Name
Casey
Designated Location
Milepost
Designated Name
Clementsville
Pipe Fac Name
Clementsville Compressor Station
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
Interstate
System Part Involved
Onshore Compressor Station Equipment And Piping
Item Involved
Esd System, But Excluding Product Drain Lines And Tubing
Material Involved
Carbon Steel
Release Type
Other
Release Type Details
Relief Valve Malfunctioned (Lost Signal Gas) And Opened At Pressure Below Maop. Relief Valve Set Point Was 1050 Psig, Line Operating Pressure Was 924 Psig. Line Maop Is 1008 Psig. There Is No History Of Maop Exceedence In This Segment.
Class Location Type
Class 1 Location
Could Be Hca
No
Pir Radius
175
Heat Damage Ind
No
Non Heat Damage Ind
No
Hca Fatalities Ind
No
Est Cost Oper Paid
0
Est Cost Unintentional Release
33723
Est Cost Intentional Release
2
Est Cost Prop Damage
500
Est Cost Emergency
500
Est Cost Other
0
Prpty
34725
Accident Psig
924
Mop Psig
1008
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
Yes
Scada Conf Ind
Yes
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
Root cause was an equipment malfunction (broken signal gas line) that was not in any way caused by control room actions.
Employee Drug Test Ind
No
Contractor Drug Test Ind
No
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
Signal Gas Line Connection Failed. Fatigue Possible, But Little Vibration Seen.
Preparer Name
D**** A****
Preparer Title
Engineer - System Integrity
Preparer Email
D*****@n*******.com
Preparer Telephone
304-357-2378
Preparer Fax
304-357-3804
Authorizer Name
P**** M* H******
Authorizer Title
Manager - System Integrity
Authorizer Telephone
304-357-2548
Authorizer Email
M**********@n*******.com
Narrative
Shortly after 5:30 am on 5/10/2012 a columbia gulf transmission employee received a call from a person living near our clementsville compressor station. The call informed the employee that the station was making a noise. The employee arrived on site shortly after 6:00 am and heard gas venting. By 6:30 the problem had been isolated to a malfunctioning relief valve. A second relief valve was present in this section of piping, so the malfunctioning valve was closed. The station resumed normal operations. By 7:00, a quick review of operating parameters was underway. Before 7:30 it was determined that over 3000 mcf of gas had likely been released. A call was made to the nrc by a few minutes after 8:00. Later that day it was determined that a connection in the tubing that supplied signal gas to the relief valve had failed. This had caused the relief valve to open at a pressure significantly below the maop. The connection was replaced with a different style connection at this location and other similar locations. Note on part a question 19a and 19b: company personnel actually arrived on site before it was determined that an incident had occurred. However the electronic version of this form does not seem to allow that sequence of events to be input. Reference the above narrative.
| Report Received Date | 2012-06-09 00:00:00 |
|---|---|
| Iyear | 2012 |
| Report Number | 20120059 |
| Supplemental Number | 16348 |
| Report Type | Supplemental Final |
| Operator Id | 2620 PHMSA Enforcement |
| Name | Columbia Gulf Transmission Co |
| Operator Street Address | 700 Louisiana St. Suite 700 |
| Operator City Name | Houston |
| Operator State Abbreviation | TX |
| Operator Postal Code | 77002 |
| Local Datetime | 2012-05-10 06:32:00 |
| Location Latitude | 37.31 Google Maps OpenStreetMap |
| Location Longitude | -85.061136 Google Maps OpenStreetMap |
| Nrc Rpt Num | 1011062 NRC Report How to search |
| Nrc Rpt Datetime | 2012-05-10 08:10:00 |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 17032 |
| Intentional Release | 17033 |
| Accompanying Liquid | 0 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Shutdown Due Accident Ind | No |
| Shutdown Explain | Malfunctioing Relief Valve. Facility Lost Some Pressure But Remained In Service |
| Ignite Ind | No |
| Explode Ind | No |
| Num Pub Evacuated | 0 |
| Incident Identified Datetime | 2012-05-10 07:10:00 |
| On Site Datetime | 2012-05-10 07:10:00 |
| On Off Shore | Onshore |
| Onshore State Abbreviation | Ky |
| Onshore Postal Code | 42539 |
| Onshore City Name | Liberty |
| Onshore County Name | Casey |
| Designated Location | Milepost |
| Designated Name | Clementsville |
| Pipe Fac Name | Clementsville Compressor Station |
| 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 | Interstate |
| System Part Involved | Onshore Compressor Station Equipment And Piping |
| Item Involved | Esd System, But Excluding Product Drain Lines And Tubing |
| Material Involved | Carbon Steel |
| Release Type | Other |
| Release Type Details | Relief Valve Malfunctioned (Lost Signal Gas) And Opened At Pressure Below Maop. Relief Valve Set Point Was 1050 Psig, Line Operating Pressure Was 924 Psig. Line Maop Is 1008 Psig. There Is No History Of Maop Exceedence In This Segment. |
| Class Location Type | Class 1 Location |
| Could Be Hca | No |
| Pir Radius | 175 |
| Heat Damage Ind | No |
| Non Heat Damage Ind | No |
| Hca Fatalities Ind | No |
| Est Cost Oper Paid | 0 |
| Est Cost Unintentional Release | 33723 |
| Est Cost Intentional Release | 2 |
| Est Cost Prop Damage | 500 |
| Est Cost Emergency | 500 |
| Est Cost Other | 0 |
| Prpty | 34725 |
| Accident Psig | 924 |
| Mop Psig | 1008 |
| 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 | Yes |
| Scada Conf Ind | Yes |
| 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 | Root cause was an equipment malfunction (broken signal gas line) that was not in any way caused by control room actions. |
| Employee Drug Test Ind | No |
| Contractor Drug Test Ind | No |
| 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 | Signal Gas Line Connection Failed. Fatigue Possible, But Little Vibration Seen. |
| Preparer Name | D**** A**** |
| Preparer Title | Engineer - System Integrity |
| Preparer Email | D*****@n*******.com |
| Preparer Telephone | 304-357-2378 |
| Preparer Fax | 304-357-3804 |
| Authorizer Name | P**** M* H****** |
| Authorizer Title | Manager - System Integrity |
| Authorizer Telephone | 304-357-2548 |
| Authorizer Email | M**********@n*******.com |
| Narrative | Shortly after 5:30 am on 5/10/2012 a columbia gulf transmission employee received a call from a person living near our clementsville compressor station. The call informed the employee that the station was making a noise. The employee arrived on site shortly after 6:00 am and heard gas venting. By 6:30 the problem had been isolated to a malfunctioning relief valve. A second relief valve was present in this section of piping, so the malfunctioning valve was closed. The station resumed normal operations. By 7:00, a quick review of operating parameters was underway. Before 7:30 it was determined that over 3000 mcf of gas had likely been released. A call was made to the nrc by a few minutes after 8:00. Later that day it was determined that a connection in the tubing that supplied signal gas to the relief valve had failed. This had caused the relief valve to open at a pressure significantly below the maop. The connection was replaced with a different style connection at this location and other similar locations. Note on part a question 19a and 19b: company personnel actually arrived on site before it was determined that an incident had occurred. However the electronic version of this form does not seem to allow that sequence of events to be input. Reference the above narrative. |
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