Incident details
Operator, cause, commodity and consequences with raw source fields.
GTG incident on 2025-08-01 — TX
Operator
Northern Border Pipeline Company
Cause
Equipment Failure
Commodity
Natural Gas
Program
GTG
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$0
Incident datetime
2025-08-01 00:00 UTC
Report number
Location
TX
Narrative
On july 3, 2025, at 16:24 mdt, northern border's gas control (gc) received an alarm at monchy meter station and at 16:36 mdt, gc received a call from a customer about a pressure drop on their compressor station that may have impacted monchy meter station. At 18:38 mdt, a second call was received from the customer asking for a technician on our side to investigate a relief valve at monchy meter station. Gc dispatched a technician to investigate a potential release at 18:45 mdt. Upon arriving on site at 21:17 mdt, the technician discovered natural gas was being released to the atmosphere through an eight-inch relief valve. Immediate action was taken to isolate the valve, which ended the release at 21:20 mdt. The unintentional gas loss was calculated to be approximately 217,850.1 mcf. There were no damages, injuries or hospitalizations. The investigation into the cause of the valve failure is still on-going. The relief valve is currently isolated and there is a secondary relief valve at the monchy meter station that is providing overpressure protection to the pipeline system.
Detailed record list
Report Received Date
2025-08-01 00:00:00
Iyear
2025
Report Number
20250085
Supplemental Number
41201
Report Type
Original
Operator Id
13769
Name
Northern Border Pipeline Company
Operator Street Address
700 Louisiana Street Suite 700
Operator City Name
Houston
Operator State Abbreviation
TX
Operator Postal Code
77002
Time Zone
Mountain
Daylight Savings Ind
Yes
Location Latitude
48.9992
Location Longitude
-107.5429
Nrc Rpt Num
1435961
Additional Nrc Report Numbers
1436058
Commodity Released Type
Natural Gas
Unintentional Release
217850.1
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
The Valve Was Isolated At 21:20 Mountain Time.
Communication State Fed Ind
No
Ignite Ind
No
Num Pub Evacuated
0
On Off Shore
Onshore
Onshore State Abbreviation
Mt
Onshore Postal Code
59544
Onshore City Name
Not Within A Municipality
Onshore County Name
Phillips
Designated Location
Milepost
Designated Name
Mp-0
Pipe Fac Name
Northern Border Pipeline
Segment Name
Mlv 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 Regulator/metering Station Equipment And Piping
Item Involved
Valve
Valve Type
Relief Valve
Installation Year
Unknown
Manufactured Year
Unknown
Material Involved
Carbon Steel
Release Type
Other
Release Type Details
Release From Relief Valve
Class Location Type
Class 1 Location
Could Be Hca
No
Pir Radius
1221
Heat Damage Ind
No
Non Heat Damage Ind
No
Did Occur In Mca Ind
No
Est Cost Oper Paid
0
Est Cost Unintentional Release
742869
Est Cost Intentional Release
0
Est Cost Prop Damage
0
Est Cost Emergency
0
Est Cost Other
0
Gas Cost In Mcf
3.41
Prpty
742869
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
1229
Gas Flow In Pipe In Mcf
348450
Mop Psig
1435
Mop Cfr Section
192.619(A)(1)
Maop Established Date
1982-06-23 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
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
The operator identified the alarm and followed the procedures to initiate an investigation. Field personnel was dispatched to the site and responded to the location of the alarm.
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
Relief Valve Ind
Yes
Eq Additional Other Ind
Yes
Eq Additional Other Details
Investigation On-Going
Eqf Control Releaf Ind
Yes
Preparer Name
R****** D**
Preparer Title
Dot Field Compliance Specialist
Preparer Email
R**********@t*******.com
Preparer Telephone
531-250-0754
Authorizer Name
S******** F*****
Authorizer Title
Manager Dot Field Compliance West
Authorizer Telephone
304-550-5162
Authorizer Email
S***************@t*******.com
Narrative
On july 3, 2025, at 16:24 mdt, northern border's gas control (gc) received an alarm at monchy meter station and at 16:36 mdt, gc received a call from a customer about a pressure drop on their compressor station that may have impacted monchy meter station. At 18:38 mdt, a second call was received from the customer asking for a technician on our side to investigate a relief valve at monchy meter station. Gc dispatched a technician to investigate a potential release at 18:45 mdt. Upon arriving on site at 21:17 mdt, the technician discovered natural gas was being released to the atmosphere through an eight-inch relief valve. Immediate action was taken to isolate the valve, which ended the release at 21:20 mdt. The unintentional gas loss was calculated to be approximately 217,850.1 mcf. There were no damages, injuries or hospitalizations. The investigation into the cause of the valve failure is still on-going. The relief valve is currently isolated and there is a secondary relief valve at the monchy meter station that is providing overpressure protection to the pipeline system.
| Report Received Date | 2025-08-01 00:00:00 |
|---|---|
| Iyear | 2025 |
| Report Number | 20250085 |
| Supplemental Number | 41201 |
| Report Type | Original |
| Operator Id | 13769 PHMSA Enforcement |
| Name | Northern Border Pipeline Company |
| Operator Street Address | 700 Louisiana Street Suite 700 |
| Operator City Name | Houston |
| Operator State Abbreviation | TX |
| Operator Postal Code | 77002 |
| Time Zone | Mountain |
| Daylight Savings Ind | Yes |
| Location Latitude | 48.9992 Google Maps OpenStreetMap |
| Location Longitude | -107.5429 Google Maps OpenStreetMap |
| Nrc Rpt Num | 1435961 NRC Report How to search |
| Additional Nrc Report Numbers | 1436058 |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 217850.1 |
| 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 | The Valve Was Isolated At 21:20 Mountain Time. |
| Communication State Fed Ind | No |
| Ignite Ind | No |
| Num Pub Evacuated | 0 |
| On Off Shore | Onshore |
| Onshore State Abbreviation | Mt |
| Onshore Postal Code | 59544 |
| Onshore City Name | Not Within A Municipality |
| Onshore County Name | Phillips |
| Designated Location | Milepost |
| Designated Name | Mp-0 |
| Pipe Fac Name | Northern Border Pipeline |
| Segment Name | Mlv 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 Regulator/metering Station Equipment And Piping |
| Item Involved | Valve |
| Valve Type | Relief Valve |
| Installation Year | Unknown |
| Manufactured Year | Unknown |
| Material Involved | Carbon Steel |
| Release Type | Other |
| Release Type Details | Release From Relief Valve |
| Class Location Type | Class 1 Location |
| Could Be Hca | No |
| Pir Radius | 1221 |
| Heat Damage Ind | No |
| Non Heat Damage Ind | No |
| Did Occur In Mca Ind | No |
| Est Cost Oper Paid | 0 |
| Est Cost Unintentional Release | 742869 |
| Est Cost Intentional Release | 0 |
| Est Cost Prop Damage | 0 |
| Est Cost Emergency | 0 |
| Est Cost Other | 0 |
| Gas Cost In Mcf | 3.41 |
| Prpty | 742869 |
| 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 | 1229 |
| Gas Flow In Pipe In Mcf | 348450 |
| Mop Psig | 1435 |
| Mop Cfr Section | 192.619(A)(1) View CFR 49 §192 |
| Maop Established Date | 1982-06-23 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 | 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 | The operator identified the alarm and followed the procedures to initiate an investigation. Field personnel was dispatched to the site and responded to the location of the alarm. |
| 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 |
| Relief Valve Ind | Yes |
| Eq Additional Other Ind | Yes |
| Eq Additional Other Details | Investigation On-Going |
| Eqf Control Releaf Ind | Yes |
| Preparer Name | R****** D** |
| Preparer Title | Dot Field Compliance Specialist |
| Preparer Email | R**********@t*******.com |
| Preparer Telephone | 531-250-0754 |
| Authorizer Name | S******** F***** |
| Authorizer Title | Manager Dot Field Compliance West |
| Authorizer Telephone | 304-550-5162 |
| Authorizer Email | S***************@t*******.com |
| Narrative | On july 3, 2025, at 16:24 mdt, northern border's gas control (gc) received an alarm at monchy meter station and at 16:36 mdt, gc received a call from a customer about a pressure drop on their compressor station that may have impacted monchy meter station. At 18:38 mdt, a second call was received from the customer asking for a technician on our side to investigate a relief valve at monchy meter station. Gc dispatched a technician to investigate a potential release at 18:45 mdt. Upon arriving on site at 21:17 mdt, the technician discovered natural gas was being released to the atmosphere through an eight-inch relief valve. Immediate action was taken to isolate the valve, which ended the release at 21:20 mdt. The unintentional gas loss was calculated to be approximately 217,850.1 mcf. There were no damages, injuries or hospitalizations. The investigation into the cause of the valve failure is still on-going. The relief valve is currently isolated and there is a secondary relief valve at the monchy meter station that is providing overpressure protection to the pipeline system. |
External Resources
PHMSA pipeline safety insights.
Product
Features
Company
All rights reserved. Copyright © by ClearPHMSA