Incident details
Operator, cause, commodity and consequences with raw source fields.
GTG incident on 2017-11-22 — TX
Operator
Enable Gas Transmission, Llc
Cause
Equipment Failure
Commodity
Natural Gas
Program
GTG
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$0
Incident datetime
2017-11-22 05:45
Report number
Location
TX
Narrative
During the 06:00 shift change on 11/22/17, enable gas transmission system control became aware of an unusual situation with line om-1. System control did not receive any alerts, safety related alarms, or rate of change alarms to notify them of the situation but did notice an increase in flow rate into line om-1 and a decrease in discharge pressure at dunn station. System control immediately dispatched field technicians to survey line om-1 to investigate the situation. At approximately 06:44, a 911 operator contacted system control to report a loud noise, and possible gas leak, near hwy 90 near noel, missouri. At 07:21, an enable field technician discovered a blowdown valve releasing natural gas to atmosphere at the jane compressor station. After the station was secured, scada data was checked and by 08:01 the issue had been corrected. Upon investigation, a versa valve actuator for the blowdown valve failed open due to a leak in the pilot tubing. The loose fitting was tightened eliminating the leak. The remaining valve fittings were checked at the station for tightness. On the morning of 11/22/17 enable midstream reported a potential release to the nrc (nrc #1197895 07:13), and followed up later with a location and quantity change (nrc# 1197919 12:17). The 48 hour follow up call was placed on 11/24/17 (nrc# 1197992 07:10).
Detailed record list
Report Received Date
2017-12-15 00:00:00
Iyear
2017
Report Number
20170121
Supplemental Number
17530
Report Type
Original Final
Operator Id
Name
Enable Gas Transmission, Llc
Operator Street Address
1300 Main Street
Operator City Name
Houston
Operator State Abbreviation
TX
Operator Postal Code
77002
Local Datetime
2017-11-22 05:21:00
Location Latitude
36.52811701
Location Longitude
-94.38231801
Nrc Rpt Num
1197895
Nrc Rpt Datetime
2017-11-22 07:13:00
Commodity Released Type
Natural Gas
Unintentional Release
21095
Intentional Release
0
Accompanying Liquid
0
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Shutdown Due Accident Ind
No
Shutdown Explain
Adjustments Made To Pilot Tubing Connection While Online.
Ignite Ind
No
Explode Ind
No
Num Pub Evacuated
0
Incident Identified Datetime
2017-11-22 05:45:00
On Site Datetime
2017-11-22 07:21:00
On Off Shore
Onshore
Onshore State Abbreviation
Mo
Onshore Postal Code
64854
Onshore City Name
Noel
Onshore County Name
Mcdonald
Designated Location
Milepost
Pipe Fac Name
Jane Compressor Station
Segment Name
Line Om-1
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
Tubing
Installation Year
Unknown
Material Involved
Carbon Steel
Release Type
Leak
Leak Type
Connection Failure
Class Location Type
Class 1 Location
Could Be Hca
No
Pir Radius
436
Heat Damage Ind
No
Non Heat Damage Ind
No
Hca Fatalities Ind
No
Est Cost Oper Paid
0
Est Cost Unintentional Release
67576
Est Cost Intentional Release
0
Est Cost Prop Damage
0
Est Cost Emergency
1000
Est Cost Other
0
Prpty
68576
Accident Psig
821
Mop Psig
1000
Mop Cfr Section
192.619(A)(1)
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
Scada-Based Information (Such As Alarm(S), Alert(S), Event(S), And/or Volume Or Pack Calculations)
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
Malfunction of a component caused a versa valve to fail open.
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 Vibration Ind
Yes
Preparer Name
C**** R******
Preparer Title
Lead Dot Compliance Program Manager
Preparer Email
C************@e**************.com
Preparer Telephone
405 558 4647
Authorizer Name
C**** R******
Authorizer Title
Lead Dot Compliance Program Manager
Authorizer Telephone
405 558 4647
Authorizer Email
C************@e**************.com
Narrative
During the 06:00 shift change on 11/22/17, enable gas transmission system control became aware of an unusual situation with line om-1. System control did not receive any alerts, safety related alarms, or rate of change alarms to notify them of the situation but did notice an increase in flow rate into line om-1 and a decrease in discharge pressure at dunn station. System control immediately dispatched field technicians to survey line om-1 to investigate the situation. At approximately 06:44, a 911 operator contacted system control to report a loud noise, and possible gas leak, near hwy 90 near noel, missouri. At 07:21, an enable field technician discovered a blowdown valve releasing natural gas to atmosphere at the jane compressor station. After the station was secured, scada data was checked and by 08:01 the issue had been corrected. Upon investigation, a versa valve actuator for the blowdown valve failed open due to a leak in the pilot tubing. The loose fitting was tightened eliminating the leak. The remaining valve fittings were checked at the station for tightness. On the morning of 11/22/17 enable midstream reported a potential release to the nrc (nrc #1197895 07:13), and followed up later with a location and quantity change (nrc# 1197919 12:17). The 48 hour follow up call was placed on 11/24/17 (nrc# 1197992 07:10).
| Report Received Date | 2017-12-15 00:00:00 |
|---|---|
| Iyear | 2017 |
| Report Number | 20170121 |
| Supplemental Number | 17530 |
| Report Type | Original Final |
| Operator Id | 602 PHMSA Enforcement |
| Name | Enable Gas Transmission, Llc |
| Operator Street Address | 1300 Main Street |
| Operator City Name | Houston |
| Operator State Abbreviation | TX |
| Operator Postal Code | 77002 |
| Local Datetime | 2017-11-22 05:21:00 |
| Location Latitude | 36.52811701 Google Maps OpenStreetMap |
| Location Longitude | -94.38231801 Google Maps OpenStreetMap |
| Nrc Rpt Num | 1197895 NRC Report How to search |
| Nrc Rpt Datetime | 2017-11-22 07:13:00 |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 21095 |
| Intentional Release | 0 |
| Accompanying Liquid | 0 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Shutdown Due Accident Ind | No |
| Shutdown Explain | Adjustments Made To Pilot Tubing Connection While Online. |
| Ignite Ind | No |
| Explode Ind | No |
| Num Pub Evacuated | 0 |
| Incident Identified Datetime | 2017-11-22 05:45:00 |
| On Site Datetime | 2017-11-22 07:21:00 |
| On Off Shore | Onshore |
| Onshore State Abbreviation | Mo |
| Onshore Postal Code | 64854 |
| Onshore City Name | Noel |
| Onshore County Name | Mcdonald |
| Designated Location | Milepost |
| Pipe Fac Name | Jane Compressor Station |
| Segment Name | Line Om-1 |
| 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 | Tubing |
| Installation Year | Unknown |
| Material Involved | Carbon Steel |
| Release Type | Leak |
| Leak Type | Connection Failure |
| Class Location Type | Class 1 Location |
| Could Be Hca | No |
| Pir Radius | 436 |
| Heat Damage Ind | No |
| Non Heat Damage Ind | No |
| Hca Fatalities Ind | No |
| Est Cost Oper Paid | 0 |
| Est Cost Unintentional Release | 67576 |
| Est Cost Intentional Release | 0 |
| Est Cost Prop Damage | 0 |
| Est Cost Emergency | 1000 |
| Est Cost Other | 0 |
| Prpty | 68576 |
| Accident Psig | 821 |
| Mop Psig | 1000 |
| Mop Cfr Section | 192.619(A)(1) 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 | Scada-Based Information (Such As Alarm(S), Alert(S), Event(S), And/or Volume Or Pack Calculations) |
| 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 | Malfunction of a component caused a versa valve to fail open. |
| 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 Vibration Ind | Yes |
| Preparer Name | C**** R****** |
| Preparer Title | Lead Dot Compliance Program Manager |
| Preparer Email | C************@e**************.com |
| Preparer Telephone | 405 558 4647 |
| Authorizer Name | C**** R****** |
| Authorizer Title | Lead Dot Compliance Program Manager |
| Authorizer Telephone | 405 558 4647 |
| Authorizer Email | C************@e**************.com |
| Narrative | During the 06:00 shift change on 11/22/17, enable gas transmission system control became aware of an unusual situation with line om-1. System control did not receive any alerts, safety related alarms, or rate of change alarms to notify them of the situation but did notice an increase in flow rate into line om-1 and a decrease in discharge pressure at dunn station. System control immediately dispatched field technicians to survey line om-1 to investigate the situation. At approximately 06:44, a 911 operator contacted system control to report a loud noise, and possible gas leak, near hwy 90 near noel, missouri. At 07:21, an enable field technician discovered a blowdown valve releasing natural gas to atmosphere at the jane compressor station. After the station was secured, scada data was checked and by 08:01 the issue had been corrected. Upon investigation, a versa valve actuator for the blowdown valve failed open due to a leak in the pilot tubing. The loose fitting was tightened eliminating the leak. The remaining valve fittings were checked at the station for tightness. On the morning of 11/22/17 enable midstream reported a potential release to the nrc (nrc #1197895 07:13), and followed up later with a location and quantity change (nrc# 1197919 12:17). The 48 hour follow up call was placed on 11/24/17 (nrc# 1197992 07:10). |
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