Incident details
Operator, cause, commodity and consequences with raw source fields.
GTG incident on 2024-09-26 — NE
Operator
Northern Natural Gas Co
Cause
Equipment Failure
Commodity
Natural Gas
Program
GTG
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$1,000
Incident datetime
2024-09-26 00:00 UTC
Report number
Location
NE
Narrative
A relief valve at the US steel #1 town border station vented from 2:30 am to 5:16 am. The primary regulator got liquids into the pilot. The filter was clogged also. The secondary regulator started as it should once the 5 psi differential was reached. Line pressure was at 550 psig and dropped to 430 psig. Operations personnel were notified at 2:55 am and the on-call operations person was notified at 3:05 am. From the office it is a 1.5 hrs drive to virginia, mn. The upstream meter regulator vents at 2419 mscf per hour for a total of 6652 mscf. The event was determined to be a reportable condition at 5:55 am when the volume exceeded 3 mmcf. The nrc was called at 6:15 am. Report #1410695 operations rebuilt the regulator. The heater had gone out the week prior but was brought back online. Temperature didn't get low enough to set off alarms. Transcanada does provide gas from the chicago area that does have a little moisture that condenses at certain dew points.
Detailed record list
Report Received Date
2024-09-26 00:00:00
Iyear
2024
Report Number
20240114
Supplemental Number
40364
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
Yes
Location Latitude
47.565983
Location Longitude
-92.628711
Nrc Rpt Num
1410695
Additional Nrc Report Numbers
1410881
Commodity Released Type
Natural Gas
Unintentional Release
6652
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
No
Shutdown Explain
Able To Maintain Service
Communication State Fed Ind
No
Ignite Ind
No
Num Pub Evacuated
0
On Off Shore
Onshore
Onshore State Abbreviation
Mn
Onshore Postal Code
55741
Onshore City Name
Mountain Iron
Onshore County Name
St. Louis
Designated Location
Not Applicable
Pipe Fac Name
Us Steel #1 Town Border Station
Segment Name
905041
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
Regulator/control Valve
Installation Year
1966
Manufactured Year
1966
Material Involved
Carbon Steel
Release Type
Other
Release Type Details
Relief Valve
Class Location Type
Class 1 Location
Could Be Hca
No
Pir Radius
236
Heat Damage Ind
No
Non Heat Damage Ind
No
Did Occur In Mca Ind
No
Est Cost Oper Paid
0
Est Cost Unintentional Release
18226
Est Cost Intentional Release
0
Est Cost Prop Damage
1000
Est Cost Emergency
500
Est Cost Other
0
Gas Cost In Mcf
2.74
Prpty
19726
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
550
Gas Flow In Pipe In Mcf
16.7
Mop Psig
905
Mop Cfr Section
192.619(A)(2)
Maop Established Date
1966-12-01 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
No
Scada Conf Ind
No
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
Gas control never received a low alarm or alert on the station. Once the first regulator failed the secondary regulator took over delivery.
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
Pressure Regulator Ind
Yes
Additional Breakdown Ind
Yes
Preparer Name
J*** G******
Preparer Title
Sr Pipeline Safety Specialist
Preparer Email
J***********@n****.com
Preparer Telephone
4026811574
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 Rist
Authorizer Telephone
4023987715
Authorizer Email
T*************@n****.com
Narrative
A relief valve at the US steel #1 town border station vented from 2:30 am to 5:16 am. The primary regulator got liquids into the pilot. The filter was clogged also. The secondary regulator started as it should once the 5 psi differential was reached. Line pressure was at 550 psig and dropped to 430 psig. Operations personnel were notified at 2:55 am and the on-call operations person was notified at 3:05 am. From the office it is a 1.5 hrs drive to virginia, mn. The upstream meter regulator vents at 2419 mscf per hour for a total of 6652 mscf. The event was determined to be a reportable condition at 5:55 am when the volume exceeded 3 mmcf. The nrc was called at 6:15 am. Report #1410695 operations rebuilt the regulator. The heater had gone out the week prior but was brought back online. Temperature didn't get low enough to set off alarms. Transcanada does provide gas from the chicago area that does have a little moisture that condenses at certain dew points.
| Report Received Date | 2024-09-26 00:00:00 |
|---|---|
| Iyear | 2024 |
| Report Number | 20240114 |
| Supplemental Number | 40364 |
| 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 | Yes |
| Location Latitude | 47.565983 Google Maps OpenStreetMap |
| Location Longitude | -92.628711 Google Maps OpenStreetMap |
| Nrc Rpt Num | 1410695 NRC Report How to search |
| Additional Nrc Report Numbers | 1410881 |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 6652 |
| 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 | No |
| Shutdown Explain | Able To Maintain Service |
| Communication State Fed Ind | No |
| Ignite Ind | No |
| Num Pub Evacuated | 0 |
| On Off Shore | Onshore |
| Onshore State Abbreviation | Mn |
| Onshore Postal Code | 55741 |
| Onshore City Name | Mountain Iron |
| Onshore County Name | St. Louis |
| Designated Location | Not Applicable |
| Pipe Fac Name | Us Steel #1 Town Border Station |
| Segment Name | 905041 |
| 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 | Regulator/control Valve |
| Installation Year | 1966 |
| Manufactured Year | 1966 |
| Material Involved | Carbon Steel |
| Release Type | Other |
| Release Type Details | Relief Valve |
| Class Location Type | Class 1 Location |
| Could Be Hca | No |
| Pir Radius | 236 |
| Heat Damage Ind | No |
| Non Heat Damage Ind | No |
| Did Occur In Mca Ind | No |
| Est Cost Oper Paid | 0 |
| Est Cost Unintentional Release | 18226 |
| Est Cost Intentional Release | 0 |
| Est Cost Prop Damage | 1000 |
| Est Cost Emergency | 500 |
| Est Cost Other | 0 |
| Gas Cost In Mcf | 2.74 |
| Prpty | 19726 |
| 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 | 550 |
| Gas Flow In Pipe In Mcf | 16.7 |
| Mop Psig | 905 |
| Mop Cfr Section | 192.619(A)(2) View CFR 49 §192 |
| Maop Established Date | 1966-12-01 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 | No |
| Scada Conf Ind | No |
| 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 | Gas control never received a low alarm or alert on the station. Once the first regulator failed the secondary regulator took over delivery. |
| 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 |
| Pressure Regulator Ind | Yes |
| Additional Breakdown Ind | Yes |
| Preparer Name | J*** G****** |
| Preparer Title | Sr Pipeline Safety Specialist |
| Preparer Email | J***********@n****.com |
| Preparer Telephone | 4026811574 |
| 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 Rist |
| Authorizer Telephone | 4023987715 |
| Authorizer Email | T*************@n****.com |
| Narrative | A relief valve at the US steel #1 town border station vented from 2:30 am to 5:16 am. The primary regulator got liquids into the pilot. The filter was clogged also. The secondary regulator started as it should once the 5 psi differential was reached. Line pressure was at 550 psig and dropped to 430 psig. Operations personnel were notified at 2:55 am and the on-call operations person was notified at 3:05 am. From the office it is a 1.5 hrs drive to virginia, mn. The upstream meter regulator vents at 2419 mscf per hour for a total of 6652 mscf. The event was determined to be a reportable condition at 5:55 am when the volume exceeded 3 mmcf. The nrc was called at 6:15 am. Report #1410695 operations rebuilt the regulator. The heater had gone out the week prior but was brought back online. Temperature didn't get low enough to set off alarms. Transcanada does provide gas from the chicago area that does have a little moisture that condenses at certain dew points. |
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