Incident details
Operator, cause, commodity and consequences with raw source fields.
GTG incident on 2022-10-24 — TX
Operator
Enable Oklahoma Intrastate Transmission, Llc
Cause
Equipment Failure
Commodity
Natural Gas
Program
GTG
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$2,700
Incident datetime
2022-10-24 08:25
Report number
Location
TX
Narrative
On october 21st, 2022, at approximately 19:00 hours, tech was dispatched to bennington cs unit 447 to troubleshoot unit 447 going down. Tech corrected the issue, put it back online and departed. Unit 447 went back down on oil temperature on the same date at approximately 20:30 hours. At approximately 20:35 hours, tech advised gas control to start unit 442 remotely. Tech then went back to station to reset the oil cooler temperature shutdown on unit 447. During this time, unit 442 failed to start due to not being pressurized. At approximately 21:05, tech then started unit 447 and put back online and advised gas control that unit 442 was unavailable due to the load valve failure. On monday, october 24th, 2022, at approximately 07:00 hours, tech arrived at the station and was reviewing alarms that occurred over the weekend. He noticed that the load valve failure alarm on unit 442 was still active. Tech went out to unit 442 to physically inspect why the alarm was still active. Tech discovered that unit 442's load valve was partially open and venting gas. At 08:25 hours, tech manually closed the load valve on unit 442 to prevent it from venting and notified his supervisor of the incident at approximately 08:30 hours. Supervisor then initiated an investigation of the incident to try and determine how long the valve had vented gas and what caused the incident. A balance segment was done on bennington compressor station to determine the volume of gas vented. It was determined that the valve had vented gas from october 21st, 2022, at 21:02 hours to october 24th, 2022, at 08:25 hours (approximately 59 hours and 23 minutes). On october 24th at approximately 14:10 hours, supervisor notified DOT compliance personnel. At this point, it was determined to be a reportable incident. Incident was reported to nrc on october 24th, 2022, at 14:20. On october 25th, 2022, at approximately 13:00 hours, plc programmer reviewed the programming on unit 442 and determined there was not a logic in the plc that would prevent this from happening. On october 26th, 2022, at approximately 10:00 hours, plc programmer and station I&e tech, made the plc logic changes that would prevent this from happening again. We now have a timed lockout on the unit that if it does not start in a certain programmed time, the valve will automatically close the vent valve and give an alarm of the lockout. The unit was left locked and tagged out until such plc programming could be tested and verified to be accurate. On december 1st, 2022, at approximately 08:00 hours, logic was tested on the plc for unit 442, and proven to be effective. This change will prevent further incidents from occurring. A specific cause of the load valve failure could not be pinpointed therefore, a new load valve (new valve and actuator) was ordered and is waiting to be installed. Unit 442 is locked and tagged out of service until a station outage can be scheduled to replace the load valve on unit 442. Note: as directed by aid/rodriguez, the "earliest time a reporting criteria was met" was changed on 4/26/2023. The original date and time, 10/24/2022 14:20, was changed to 10/21/2022 21:02 as directed to do per aid.
Detailed record list
Report Received Date
2022-11-09 00:00:00
Iyear
2022
Report Number
20220119
Supplemental Number
38107
Report Type
Supplemental Final
Operator Id
26330
Name
Enable Oklahoma Intrastate Transmission, Llc
Operator Street Address
1300 Main Street
Operator City Name
Houston
Operator State Abbreviation
TX
Operator Postal Code
77002
Local Datetime
2022-10-21 21:02:00
Time Zone
Central
Daylight Savings Ind
Yes
Location Latitude
33.978415
Location Longitude
-96.007316
Nrc Rpt Num
1350720
Nrc Rpt Datetime
2022-10-24 14:20:00
Additional Nrc Report Numbers
1350783, 1350817
Commodity Released Type
Natural Gas
Unintentional Release
16619
Intentional Release
0
Accompanying Liquid
0
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Status When Identified
Routine Start-Up
Shutdown Due Accident Ind
No
Shutdown Explain
This Was A Loading Valve Failure On A Compressor Skid. Unit Did Not Start Up.
Communication State Fed Ind
No
Ignite Ind
No
Num Pub Evacuated
0
Incident Identified Datetime
2022-10-24 08:25:00
On Site Datetime
2022-10-24 08:25:00
On Off Shore
Onshore
Onshore State Abbreviation
Ok
Onshore Postal Code
74723
Onshore City Name
Not Within A Municipality
Onshore County Name
Bryan
Designated Location
Not Applicable
Pipe Fac Name
Bennington Compressor Station
Segment Name
Compressor Unit #442
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 Compressor Station Equipment And Piping
Item Involved
Compressor
Installation Year
2008
Manufactured Year
Unknown
Material Involved
Carbon Steel
Release Type
Other
Release Type Details
This Was A Loading Valve Failure On A Compressor Skid. Unit Did Not Start Up. The Load Valve Failed Partially Open Allowing Gas To Vent.
Class Location Type
Class 1 Location
Could Be Hca
No
Pir Radius
660
Heat Damage Ind
No
Non Heat Damage Ind
No
Did Occur In Mca Ind
No
Est Cost Oper Paid
0
Est Cost Unintentional Release
86086
Est Cost Intentional Release
0
Est Cost Prop Damage
2700
Est Cost Emergency
0
Est Cost Other
0
Gas Cost In Mcf
5.18
Prpty
88786
Num Persons Hosp Not Ovnght
0
Num Injured Treated By Emt
0
Num Resident Building Affctd
0
Num Business Building Affctd
0
Wildlife Impact Ind
No
Accident Psig
350
Gas Flow In Pipe In Mcf
175000
Mop Psig
1650
Mop Cfr Section
192.619(A)(2)
Maop Established Date
2009-04-15 00:00:00
Maop Reversal Flow Ind
No
Accident Pressure
Pressure Did Not Exceed Maop
Pressure Restriction Ind
No
Gas Required Odorized 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
The actions of the controller in this incident did not warrant an investigation. The controller notified field personnel of a unit being down at the compressor station. The incident occurred when the field personnel tried to start unit 442 and the load line valve failed.
Employee Drug Test Ind
No
Contractor Drug Test Ind
No
Cause
Equipment Failure
Cause Details
Compressor Or Compressor-Related Equipment
Eq Failure Type
Compressor Or Compressor-Related Equipment
Other Compressor Ind
Other
Other Compressor Details
Seal Failure As Well As Plc Programming Contributed To This Incident.
Eq Additional Other Ind
Yes
Eq Additional Other Details
Program Logic Issue
Eqf Compressor Ind
Yes
Preparer Name
J**** C****
Preparer Email
J**********@e*************.com
Preparer Telephone
14055768230
Local Contact Name
J**** C****
Local Contact Email
J**********@e*************.com
Local Contact Telephone
14055768230
Authorizer Name
J**** C****
Authorizer Title
Sr. Manager Regulatory Compliance
Authorizer Telephone
14055768230
Authorizer Email
J**********@e*************.com
Narrative
On october 21st, 2022, at approximately 19:00 hours, tech was dispatched to bennington cs unit 447 to troubleshoot unit 447 going down. Tech corrected the issue, put it back online and departed. Unit 447 went back down on oil temperature on the same date at approximately 20:30 hours. At approximately 20:35 hours, tech advised gas control to start unit 442 remotely. Tech then went back to station to reset the oil cooler temperature shutdown on unit 447. During this time, unit 442 failed to start due to not being pressurized. At approximately 21:05, tech then started unit 447 and put back online and advised gas control that unit 442 was unavailable due to the load valve failure. On monday, october 24th, 2022, at approximately 07:00 hours, tech arrived at the station and was reviewing alarms that occurred over the weekend. He noticed that the load valve failure alarm on unit 442 was still active. Tech went out to unit 442 to physically inspect why the alarm was still active. Tech discovered that unit 442's load valve was partially open and venting gas. At 08:25 hours, tech manually closed the load valve on unit 442 to prevent it from venting and notified his supervisor of the incident at approximately 08:30 hours. Supervisor then initiated an investigation of the incident to try and determine how long the valve had vented gas and what caused the incident. A balance segment was done on bennington compressor station to determine the volume of gas vented. It was determined that the valve had vented gas from october 21st, 2022, at 21:02 hours to october 24th, 2022, at 08:25 hours (approximately 59 hours and 23 minutes). On october 24th at approximately 14:10 hours, supervisor notified DOT compliance personnel. At this point, it was determined to be a reportable incident. Incident was reported to nrc on october 24th, 2022, at 14:20. On october 25th, 2022, at approximately 13:00 hours, plc programmer reviewed the programming on unit 442 and determined there was not a logic in the plc that would prevent this from happening. On october 26th, 2022, at approximately 10:00 hours, plc programmer and station I&e tech, made the plc logic changes that would prevent this from happening again. We now have a timed lockout on the unit that if it does not start in a certain programmed time, the valve will automatically close the vent valve and give an alarm of the lockout. The unit was left locked and tagged out until such plc programming could be tested and verified to be accurate. On december 1st, 2022, at approximately 08:00 hours, logic was tested on the plc for unit 442, and proven to be effective. This change will prevent further incidents from occurring. A specific cause of the load valve failure could not be pinpointed therefore, a new load valve (new valve and actuator) was ordered and is waiting to be installed. Unit 442 is locked and tagged out of service until a station outage can be scheduled to replace the load valve on unit 442. Note: as directed by aid/rodriguez, the "earliest time a reporting criteria was met" was changed on 4/26/2023. The original date and time, 10/24/2022 14:20, was changed to 10/21/2022 21:02 as directed to do per aid.
| Report Received Date | 2022-11-09 00:00:00 |
|---|---|
| Iyear | 2022 |
| Report Number | 20220119 |
| Supplemental Number | 38107 |
| Report Type | Supplemental Final |
| Operator Id | 26330 PHMSA Enforcement |
| Name | Enable Oklahoma Intrastate Transmission, Llc |
| Operator Street Address | 1300 Main Street |
| Operator City Name | Houston |
| Operator State Abbreviation | TX |
| Operator Postal Code | 77002 |
| Local Datetime | 2022-10-21 21:02:00 |
| Time Zone | Central |
| Daylight Savings Ind | Yes |
| Location Latitude | 33.978415 Google Maps OpenStreetMap |
| Location Longitude | -96.007316 Google Maps OpenStreetMap |
| Nrc Rpt Num | 1350720 NRC Report How to search |
| Nrc Rpt Datetime | 2022-10-24 14:20:00 |
| Additional Nrc Report Numbers | 1350783, 1350817 |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 16619 |
| Intentional Release | 0 |
| Accompanying Liquid | 0 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Status When Identified | Routine Start-Up |
| Shutdown Due Accident Ind | No |
| Shutdown Explain | This Was A Loading Valve Failure On A Compressor Skid. Unit Did Not Start Up. |
| Communication State Fed Ind | No |
| Ignite Ind | No |
| Num Pub Evacuated | 0 |
| Incident Identified Datetime | 2022-10-24 08:25:00 |
| On Site Datetime | 2022-10-24 08:25:00 |
| On Off Shore | Onshore |
| Onshore State Abbreviation | Ok |
| Onshore Postal Code | 74723 |
| Onshore City Name | Not Within A Municipality |
| Onshore County Name | Bryan |
| Designated Location | Not Applicable |
| Pipe Fac Name | Bennington Compressor Station |
| Segment Name | Compressor Unit #442 |
| 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 Compressor Station Equipment And Piping |
| Item Involved | Compressor |
| Installation Year | 2008 |
| Manufactured Year | Unknown |
| Material Involved | Carbon Steel |
| Release Type | Other |
| Release Type Details | This Was A Loading Valve Failure On A Compressor Skid. Unit Did Not Start Up. The Load Valve Failed Partially Open Allowing Gas To Vent. |
| Class Location Type | Class 1 Location |
| Could Be Hca | No |
| Pir Radius | 660 |
| Heat Damage Ind | No |
| Non Heat Damage Ind | No |
| Did Occur In Mca Ind | No |
| Est Cost Oper Paid | 0 |
| Est Cost Unintentional Release | 86086 |
| Est Cost Intentional Release | 0 |
| Est Cost Prop Damage | 2700 |
| Est Cost Emergency | 0 |
| Est Cost Other | 0 |
| Gas Cost In Mcf | 5.18 |
| Prpty | 88786 |
| Num Persons Hosp Not Ovnght | 0 |
| Num Injured Treated By Emt | 0 |
| Num Resident Building Affctd | 0 |
| Num Business Building Affctd | 0 |
| Wildlife Impact Ind | No |
| Accident Psig | 350 |
| Gas Flow In Pipe In Mcf | 175000 |
| Mop Psig | 1650 |
| Mop Cfr Section | 192.619(A)(2) View CFR 49 §192 |
| Maop Established Date | 2009-04-15 00:00:00 |
| Maop Reversal Flow Ind | No |
| Accident Pressure | Pressure Did Not Exceed Maop |
| Pressure Restriction Ind | No |
| Gas Required Odorized 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 | The actions of the controller in this incident did not warrant an investigation. The controller notified field personnel of a unit being down at the compressor station. The incident occurred when the field personnel tried to start unit 442 and the load line valve failed. |
| Employee Drug Test Ind | No |
| Contractor Drug Test Ind | No |
| Cause | Equipment Failure |
| Cause Details | Compressor Or Compressor-Related Equipment |
| Eq Failure Type | Compressor Or Compressor-Related Equipment |
| Other Compressor Ind | Other |
| Other Compressor Details | Seal Failure As Well As Plc Programming Contributed To This Incident. |
| Eq Additional Other Ind | Yes |
| Eq Additional Other Details | Program Logic Issue |
| Eqf Compressor Ind | Yes |
| Preparer Name | J**** C**** |
| Preparer Email | J**********@e*************.com |
| Preparer Telephone | 14055768230 |
| Local Contact Name | J**** C**** |
| Local Contact Email | J**********@e*************.com |
| Local Contact Telephone | 14055768230 |
| Authorizer Name | J**** C**** |
| Authorizer Title | Sr. Manager Regulatory Compliance |
| Authorizer Telephone | 14055768230 |
| Authorizer Email | J**********@e*************.com |
| Narrative | On october 21st, 2022, at approximately 19:00 hours, tech was dispatched to bennington cs unit 447 to troubleshoot unit 447 going down. Tech corrected the issue, put it back online and departed. Unit 447 went back down on oil temperature on the same date at approximately 20:30 hours. At approximately 20:35 hours, tech advised gas control to start unit 442 remotely. Tech then went back to station to reset the oil cooler temperature shutdown on unit 447. During this time, unit 442 failed to start due to not being pressurized. At approximately 21:05, tech then started unit 447 and put back online and advised gas control that unit 442 was unavailable due to the load valve failure. On monday, october 24th, 2022, at approximately 07:00 hours, tech arrived at the station and was reviewing alarms that occurred over the weekend. He noticed that the load valve failure alarm on unit 442 was still active. Tech went out to unit 442 to physically inspect why the alarm was still active. Tech discovered that unit 442's load valve was partially open and venting gas. At 08:25 hours, tech manually closed the load valve on unit 442 to prevent it from venting and notified his supervisor of the incident at approximately 08:30 hours. Supervisor then initiated an investigation of the incident to try and determine how long the valve had vented gas and what caused the incident. A balance segment was done on bennington compressor station to determine the volume of gas vented. It was determined that the valve had vented gas from october 21st, 2022, at 21:02 hours to october 24th, 2022, at 08:25 hours (approximately 59 hours and 23 minutes). On october 24th at approximately 14:10 hours, supervisor notified DOT compliance personnel. At this point, it was determined to be a reportable incident. Incident was reported to nrc on october 24th, 2022, at 14:20. On october 25th, 2022, at approximately 13:00 hours, plc programmer reviewed the programming on unit 442 and determined there was not a logic in the plc that would prevent this from happening. On october 26th, 2022, at approximately 10:00 hours, plc programmer and station I&e tech, made the plc logic changes that would prevent this from happening again. We now have a timed lockout on the unit that if it does not start in a certain programmed time, the valve will automatically close the vent valve and give an alarm of the lockout. The unit was left locked and tagged out until such plc programming could be tested and verified to be accurate. On december 1st, 2022, at approximately 08:00 hours, logic was tested on the plc for unit 442, and proven to be effective. This change will prevent further incidents from occurring. A specific cause of the load valve failure could not be pinpointed therefore, a new load valve (new valve and actuator) was ordered and is waiting to be installed. Unit 442 is locked and tagged out of service until a station outage can be scheduled to replace the load valve on unit 442. Note: as directed by aid/rodriguez, the "earliest time a reporting criteria was met" was changed on 4/26/2023. The original date and time, 10/24/2022 14:20, was changed to 10/21/2022 21:02 as directed to do per aid. |
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