Incident details
Operator, cause, commodity and consequences with raw source fields.
GTG incident on 2024-11-26 — NE
Operator
Northern Natural Gas Co
Cause
Equipment Failure
Commodity
Natural Gas
Program
GTG
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$300
Incident datetime
2024-11-26 00:00 UTC
Report number
Location
NE
Narrative
At approximately 0650 hours, operations received a high lel alarm on unit 6 in building no. 3. While investigating the alarm, technicians discovered the fuel line relief valve for unit 6 was venting. At 0700 hours, the failed secondary fuel regulator was isolated, and the venting stopped. It was determined that the fuel regulator failed at approximately 1500 hours, november 13, 2024, and vented until discovered at 0700 hours, november 14, 2024. The failed regulator has been repaired on 11/15/2024.
Detailed record list
Report Received Date
2024-11-26 00:00:00
Iyear
2024
Report Number
20240129
Supplemental Number
40274
Report Type
Supplemental 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
39.00716
Location Longitude
-97.87349
Nrc Rpt Num
1416373
Additional Nrc Report Numbers
1416533
Commodity Released Type
Natural Gas
Unintentional Release
7786
Intentional Release
0
Accompanying Liquid
0
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Status When Identified
Routine Shutdown
Communication State Fed Ind
No
Ignite Ind
No
Num Pub Evacuated
0
On Off Shore
Onshore
Onshore State Abbreviation
Ks
Onshore Postal Code
67484
Onshore City Name
Tescott
Onshore County Name
Ottawa
Designated Location
Survey Station No.
Designated Name
Ks-040
Pipe Fac Name
Tescott Compressor Station
Segment Name
179m640b
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 Regulator/metering Station Equipment And Piping
Item Involved
Other
Item Involved Details
Fuel Regulator
Installation Year
2020
Manufactured 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
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
15183
Est Cost Intentional Release
0
Est Cost Prop Damage
300
Est Cost Emergency
150
Est Cost Other
0
Gas Cost In Mcf
1.95
Prpty
15633
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
785
Gas Flow In Pipe In Mcf
522
Mop Psig
860
Mop Cfr Section
192.619(A)(2)
Maop Established Date
2006-07-13 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
It was preplanned to shut-off unit.6 at tescott compressor station on 11/13/2024. It was determined that the secondary fuel regulator failed and popped the relief valve for the run. The failed regulator was isolated, and the venting stopped. The failed regulator has been repaired on 11/15/2024
Employee Drug Test Ind
No
Contractor Drug Test Ind
No
Cause
Equipment Failure
Cause Details
Other Equipment Failure
Eq Failure Type
Other Equipment Failure
Eq Failure Details
Secondary Fuel Regulator
Eq Additional Other Ind
Yes
Eq Additional Other Details
The Main Spring Broke
Preparer Name
N**** K***
Preparer Title
Internal Corrosion Engineer
Preparer Email
N*********@n****.com
Preparer Telephone
4023987626
Local Contact Name
J*** G******
Local Contact Email
J***********@n****.com
Local Contact Telephone
4026811574
Authorizer Name
T** C******
Authorizer Title
Vp Pipeline Safety And Risk
Authorizer Telephone
4023987715
Authorizer Email
T*************@n****.com
Narrative
At approximately 0650 hours, operations received a high lel alarm on unit 6 in building no. 3. While investigating the alarm, technicians discovered the fuel line relief valve for unit 6 was venting. At 0700 hours, the failed secondary fuel regulator was isolated, and the venting stopped. It was determined that the fuel regulator failed at approximately 1500 hours, november 13, 2024, and vented until discovered at 0700 hours, november 14, 2024. The failed regulator has been repaired on 11/15/2024.
| Report Received Date | 2024-11-26 00:00:00 |
|---|---|
| Iyear | 2024 |
| Report Number | 20240129 |
| Supplemental Number | 40274 |
| Report Type | Supplemental 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 | 39.00716 Google Maps OpenStreetMap |
| Location Longitude | -97.87349 Google Maps OpenStreetMap |
| Nrc Rpt Num | 1416373 NRC Report How to search |
| Additional Nrc Report Numbers | 1416533 |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 7786 |
| Intentional Release | 0 |
| Accompanying Liquid | 0 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Status When Identified | Routine Shutdown |
| Communication State Fed Ind | No |
| Ignite Ind | No |
| Num Pub Evacuated | 0 |
| On Off Shore | Onshore |
| Onshore State Abbreviation | Ks |
| Onshore Postal Code | 67484 |
| Onshore City Name | Tescott |
| Onshore County Name | Ottawa |
| Designated Location | Survey Station No. |
| Designated Name | Ks-040 |
| Pipe Fac Name | Tescott Compressor Station |
| Segment Name | 179m640b |
| 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 Regulator/metering Station Equipment And Piping |
| Item Involved | Other |
| Item Involved Details | Fuel Regulator |
| Installation Year | 2020 |
| Manufactured 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 | 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 | 15183 |
| Est Cost Intentional Release | 0 |
| Est Cost Prop Damage | 300 |
| Est Cost Emergency | 150 |
| Est Cost Other | 0 |
| Gas Cost In Mcf | 1.95 |
| Prpty | 15633 |
| 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 | 785 |
| Gas Flow In Pipe In Mcf | 522 |
| Mop Psig | 860 |
| Mop Cfr Section | 192.619(A)(2) View CFR 49 §192 |
| Maop Established Date | 2006-07-13 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 | It was preplanned to shut-off unit.6 at tescott compressor station on 11/13/2024. It was determined that the secondary fuel regulator failed and popped the relief valve for the run. The failed regulator was isolated, and the venting stopped. The failed regulator has been repaired on 11/15/2024 |
| Employee Drug Test Ind | No |
| Contractor Drug Test Ind | No |
| Cause | Equipment Failure |
| Cause Details | Other Equipment Failure |
| Eq Failure Type | Other Equipment Failure |
| Eq Failure Details | Secondary Fuel Regulator |
| Eq Additional Other Ind | Yes |
| Eq Additional Other Details | The Main Spring Broke |
| Preparer Name | N**** K*** |
| Preparer Title | Internal Corrosion Engineer |
| Preparer Email | N*********@n****.com |
| Preparer Telephone | 4023987626 |
| Local Contact Name | J*** G****** |
| Local Contact Email | J***********@n****.com |
| Local Contact Telephone | 4026811574 |
| Authorizer Name | T** C****** |
| Authorizer Title | Vp Pipeline Safety And Risk |
| Authorizer Telephone | 4023987715 |
| Authorizer Email | T*************@n****.com |
| Narrative | At approximately 0650 hours, operations received a high lel alarm on unit 6 in building no. 3. While investigating the alarm, technicians discovered the fuel line relief valve for unit 6 was venting. At 0700 hours, the failed secondary fuel regulator was isolated, and the venting stopped. It was determined that the fuel regulator failed at approximately 1500 hours, november 13, 2024, and vented until discovered at 0700 hours, november 14, 2024. The failed regulator has been repaired on 11/15/2024. |
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