Incident details
Operator, cause, commodity and consequences with raw source fields.
GTG incident on 2024-11-14 — NE
Operator
Northern Natural Gas Co
Cause
Equipment Failure
Commodity
Natural Gas
Program
GTG
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$4,500
Incident datetime
2024-11-14 00:00 UTC
Report number
Location
NE
Narrative
On november 3, 2024, at 9:22 pm, the control center discovered a loss of communication with the claude compressor unit. The operations team arrived at the claude, texas, compressor station (station no. Tx-083) at 10:30 pm and discovered that the 8-inch blowdown/vent was open. The inlet and outlet valves to the compressor did not fully close causing gas to keep entering the compressor and escaping through the vent valve. The side valves were closed by 10:37 pm and the venting stopped. The operations team determined that the compressor unit's program logic controllers went down causing the loss in communication. The compressor then shutdown and vented as it was supposed to do. The plcs went down due to the main power supplies shorting out. The compressor was able to be brought back online at 12:29 am on 11/4/2024. The cause of the power supply short is still under investigation.
Detailed record list
Report Received Date
2024-11-14 00:00:00
Iyear
2024
Report Number
20240126
Supplemental Number
40224
Report Type
Original Final
Operator Id
13750
Name
Northern Natural Gas Co
Operator Street Address
1111 South 103rd Street
Operator City Name
Omaha
Operator State Abbreviation
NE
Operator Postal Code
68124
Time Zone
Central
Daylight Savings Ind
No
Location Latitude
34.986156
Location Longitude
-101.367302
Nrc Rpt Num
1415577
Additional Nrc Report Numbers
1415732
Commodity Released Type
Natural Gas
Unintentional Release
2959
Intentional Release
0
Accompanying Liquid
0
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Status When Identified
Normal Operation, Includes Pauses During Maintenance
Shutdown Due Accident Ind
Yes
Communication State Fed Ind
No
Ignite Ind
No
Num Pub Evacuated
0
On Off Shore
Onshore
Onshore State Abbreviation
Tx
Onshore Postal Code
79019
Onshore City Name
Claude
Onshore County Name
Armstrong
Designated Location
Not Applicable
Pipe Fac Name
Claude Compressor Station
Segment Name
Tx-083
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
Instrumentation
Installation Year
2008
Manufactured Year
Unknown
Material Involved
Carbon Steel
Release Type
Other
Release Type Details
Blow Down Vent.
Class Location Type
Class 1 Location
Could Be Hca
No
Pir Radius
750
Heat Damage Ind
No
Non Heat Damage Ind
No
Did Occur In Mca Ind
No
Est Cost Oper Paid
0
Est Cost Unintentional Release
8108
Est Cost Intentional Release
0
Est Cost Prop Damage
4500
Est Cost Emergency
5000
Est Cost Other
0
Gas Cost In Mcf
2.74
Prpty
17608
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
720
Gas Flow In Pipe In Mcf
400000
Mop Psig
1000
Mop Cfr Section
192.619(A)(2)
Maop Established Date
1967-01-01 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 contributing factor of the release was a plc power system failure at the location of the release.
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
Instrumentation Ind
Yes
Additional Electricity Ind
Yes
Preparer Name
W**** L** C*****
Preparer Title
Pipeline Integrity Engineer
Preparer Email
W***********@n****.com
Preparer Telephone
4023987734
Local Contact Name
W**** L** C*****
Local Contact Email
W***********@n****.com
Local Contact Telephone
4023987734
Authorizer Name
T** C******
Authorizer Title
Vp Pipeline Safety And Risk
Authorizer Telephone
4023987715
Authorizer Email
T*************@n****.com
Narrative
On november 3, 2024, at 9:22 pm, the control center discovered a loss of communication with the claude compressor unit. The operations team arrived at the claude, texas, compressor station (station no. Tx-083) at 10:30 pm and discovered that the 8-inch blowdown/vent was open. The inlet and outlet valves to the compressor did not fully close causing gas to keep entering the compressor and escaping through the vent valve. The side valves were closed by 10:37 pm and the venting stopped. The operations team determined that the compressor unit's program logic controllers went down causing the loss in communication. The compressor then shutdown and vented as it was supposed to do. The plcs went down due to the main power supplies shorting out. The compressor was able to be brought back online at 12:29 am on 11/4/2024. The cause of the power supply short is still under investigation.
| Report Received Date | 2024-11-14 00:00:00 |
|---|---|
| Iyear | 2024 |
| Report Number | 20240126 |
| Supplemental Number | 40224 |
| Report Type | Original Final |
| Operator Id | 13750 PHMSA Enforcement |
| Name | Northern Natural Gas Co |
| Operator Street Address | 1111 South 103rd Street |
| Operator City Name | Omaha |
| Operator State Abbreviation | NE |
| Operator Postal Code | 68124 |
| Time Zone | Central |
| Daylight Savings Ind | No |
| Location Latitude | 34.986156 Google Maps OpenStreetMap |
| Location Longitude | -101.367302 Google Maps OpenStreetMap |
| Nrc Rpt Num | 1415577 NRC Report How to search |
| Additional Nrc Report Numbers | 1415732 |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 2959 |
| Intentional Release | 0 |
| Accompanying Liquid | 0 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Status When Identified | Normal Operation, Includes Pauses During Maintenance |
| Shutdown Due Accident Ind | Yes |
| Communication State Fed Ind | No |
| Ignite Ind | No |
| Num Pub Evacuated | 0 |
| On Off Shore | Onshore |
| Onshore State Abbreviation | Tx |
| Onshore Postal Code | 79019 |
| Onshore City Name | Claude |
| Onshore County Name | Armstrong |
| Designated Location | Not Applicable |
| Pipe Fac Name | Claude Compressor Station |
| Segment Name | Tx-083 |
| 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 | Instrumentation |
| Installation Year | 2008 |
| Manufactured Year | Unknown |
| Material Involved | Carbon Steel |
| Release Type | Other |
| Release Type Details | Blow Down Vent. |
| Class Location Type | Class 1 Location |
| Could Be Hca | No |
| Pir Radius | 750 |
| Heat Damage Ind | No |
| Non Heat Damage Ind | No |
| Did Occur In Mca Ind | No |
| Est Cost Oper Paid | 0 |
| Est Cost Unintentional Release | 8108 |
| Est Cost Intentional Release | 0 |
| Est Cost Prop Damage | 4500 |
| Est Cost Emergency | 5000 |
| Est Cost Other | 0 |
| Gas Cost In Mcf | 2.74 |
| Prpty | 17608 |
| 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 | 720 |
| Gas Flow In Pipe In Mcf | 400000 |
| Mop Psig | 1000 |
| Mop Cfr Section | 192.619(A)(2) View CFR 49 §192 |
| Maop Established Date | 1967-01-01 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 contributing factor of the release was a plc power system failure at the location of the release. |
| 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 |
| Instrumentation Ind | Yes |
| Additional Electricity Ind | Yes |
| Preparer Name | W**** L** C***** |
| Preparer Title | Pipeline Integrity Engineer |
| Preparer Email | W***********@n****.com |
| Preparer Telephone | 4023987734 |
| Local Contact Name | W**** L** C***** |
| Local Contact Email | W***********@n****.com |
| Local Contact Telephone | 4023987734 |
| Authorizer Name | T** C****** |
| Authorizer Title | Vp Pipeline Safety And Risk |
| Authorizer Telephone | 4023987715 |
| Authorizer Email | T*************@n****.com |
| Narrative | On november 3, 2024, at 9:22 pm, the control center discovered a loss of communication with the claude compressor unit. The operations team arrived at the claude, texas, compressor station (station no. Tx-083) at 10:30 pm and discovered that the 8-inch blowdown/vent was open. The inlet and outlet valves to the compressor did not fully close causing gas to keep entering the compressor and escaping through the vent valve. The side valves were closed by 10:37 pm and the venting stopped. The operations team determined that the compressor unit's program logic controllers went down causing the loss in communication. The compressor then shutdown and vented as it was supposed to do. The plcs went down due to the main power supplies shorting out. The compressor was able to be brought back online at 12:29 am on 11/4/2024. The cause of the power supply short is still under investigation. |
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