GTG incident on 2024-10-04 — TX

Operator
Northwest Pipeline Llc
Cause
Equipment Failure
Commodity
Natural Gas
Program
GTG
Damage and Injuries
0 fatalities 0 injuries
Property damage (nominal)
$0
Incident datetime
2024-10-04 00:00 UTC
Report number
Location
TX
Narrative
On august 18th at approximately 17:00 cst gas control was remote starting unit 1 at the goldendale compressor station. At 17:03 an a/c power failure alarm was received and the unit shutdown on low pressure. At 17:21 an alarm for unexpected gas venting was received. Local operations was notified. Due to response time gas control worked to remotely reduce pressure. When that was unsuccessful station was remotely isolated and the release was stopped by 18:15. Initial estimate of volume released was 10 mscfd, which was below the reporting threshold. When rechecking the calculation for environmental reporting and the volume release estimated at 6,000 mscfd. This resulted in the need to report. Failure to report was due to internal miscommunication of volume. Company investigation is on going and a supplemental report will be submitted once the investigation is complete.
Detailed record list
Report Received Date
2024-10-04 00:00:00
Iyear
2024
Report Number
20240115
Supplemental Number
40071
Report Type
Original
Operator Id
Name
Northwest Pipeline Llc
Operator Street Address
2800 Post Oak Blvd
Operator City Name
Houston
Operator State Abbreviation
TX
Operator Postal Code
77056
Time Zone
Pacific
Daylight Savings Ind
Yes
Location Latitude
Location Longitude
Nrc Rpt Num
Additional Nrc Report Numbers
1410154
Commodity Released Type
Natural Gas
Unintentional Release
6114.82
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
Yes
Communication State Fed Ind
No
Ignite Ind
No
Num Pub Evacuated
0
On Off Shore
Onshore
Onshore State Abbreviation
Wa
Onshore Postal Code
98620
Onshore City Name
Goldendale
Onshore County Name
Klickitat
Designated Location
Not Applicable
Pipe Fac Name
Goldendale Compressor Station
Segment Name
1400
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
Compressor
Installation Year
1992
Manufactured Year
Unknown
Material Involved
Carbon Steel
Release Type
Other
Release Type Details
Release From Vent Valve
Class Location Type
Class 3 Location
Could Be Hca
No
Pir Radius
554
Heat Damage Ind
No
Non Heat Damage Ind
No
Did Occur In Mca Ind
No
Est Cost Oper Paid
0
Est Cost Unintentional Release
9906
Est Cost Intentional Release
0
Est Cost Prop Damage
0
Est Cost Emergency
0
Est Cost Other
0
Gas Cost In Mcf
1.62
Prpty
9906
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
555
Gas Flow In Pipe In Mcf
0
Mop Psig
809
Mop Cfr Section
192.619(A)(2)
Maop Established Date
1973-08-16 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
Yes, but the investigation of the control room and/or controller actions has not yet been completed by the operator (supplemental report required)
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
Power Failure Ind
Yes
Additional Electricity Ind
Yes
Preparer Name
C********** E*****
Preparer Title
Senior Engineer
Preparer Email
C***********@w*******.com
Preparer Telephone
570-406-0743
Authorizer Name
E*** W****
Authorizer Title
Manager Pipeline Safety
Authorizer Telephone
281-536-9504
Authorizer Email
E*********@w*******.com
Narrative
On august 18th at approximately 17:00 cst gas control was remote starting unit 1 at the goldendale compressor station. At 17:03 an a/c power failure alarm was received and the unit shutdown on low pressure. At 17:21 an alarm for unexpected gas venting was received. Local operations was notified. Due to response time gas control worked to remotely reduce pressure. When that was unsuccessful station was remotely isolated and the release was stopped by 18:15. Initial estimate of volume released was 10 mscfd, which was below the reporting threshold. When rechecking the calculation for environmental reporting and the volume release estimated at 6,000 mscfd. This resulted in the need to report. Failure to report was due to internal miscommunication of volume. Company investigation is on going and a supplemental report will be submitted once the investigation is complete.
Report Received Date 2024-10-04 00:00:00
Iyear 2024
Report Number 20240115
Supplemental Number 40071
Report Type Original
Operator Id 13845 PHMSA Enforcement
Name Northwest Pipeline Llc
Operator Street Address 2800 Post Oak Blvd
Operator City Name Houston
Operator State Abbreviation TX
Operator Postal Code 77056
Time Zone Pacific
Daylight Savings Ind Yes
Location Latitude 45.771312 Google Maps OpenStreetMap
Location Longitude -120.79931 Google Maps OpenStreetMap
Nrc Rpt Num 1410114 NRC Report How to search
Additional Nrc Report Numbers 1410154
Commodity Released Type Natural Gas
Unintentional Release 6114.82
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 Yes
Communication State Fed Ind No
Ignite Ind No
Num Pub Evacuated 0
On Off Shore Onshore
Onshore State Abbreviation Wa
Onshore Postal Code 98620
Onshore City Name Goldendale
Onshore County Name Klickitat
Designated Location Not Applicable
Pipe Fac Name Goldendale Compressor Station
Segment Name 1400
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 Compressor
Installation Year 1992
Manufactured Year Unknown
Material Involved Carbon Steel
Release Type Other
Release Type Details Release From Vent Valve
Class Location Type Class 3 Location
Could Be Hca No
Pir Radius 554
Heat Damage Ind No
Non Heat Damage Ind No
Did Occur In Mca Ind No
Est Cost Oper Paid 0
Est Cost Unintentional Release 9906
Est Cost Intentional Release 0
Est Cost Prop Damage 0
Est Cost Emergency 0
Est Cost Other 0
Gas Cost In Mcf 1.62
Prpty 9906
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 555
Gas Flow In Pipe In Mcf 0
Mop Psig 809
Mop Cfr Section 192.619(A)(2) View CFR 49 §192
Maop Established Date 1973-08-16 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 Yes, but the investigation of the control room and/or controller actions has not yet been completed by the operator (supplemental report required)
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
Power Failure Ind Yes
Additional Electricity Ind Yes
Preparer Name C********** E*****
Preparer Title Senior Engineer
Preparer Email C***********@w*******.com
Preparer Telephone 570-406-0743
Authorizer Name E*** W****
Authorizer Title Manager Pipeline Safety
Authorizer Telephone 281-536-9504
Authorizer Email E*********@w*******.com
Narrative On august 18th at approximately 17:00 cst gas control was remote starting unit 1 at the goldendale compressor station. At 17:03 an a/c power failure alarm was received and the unit shutdown on low pressure. At 17:21 an alarm for unexpected gas venting was received. Local operations was notified. Due to response time gas control worked to remotely reduce pressure. When that was unsuccessful station was remotely isolated and the release was stopped by 18:15. Initial estimate of volume released was 10 mscfd, which was below the reporting threshold. When rechecking the calculation for environmental reporting and the volume release estimated at 6,000 mscfd. This resulted in the need to report. Failure to report was due to internal miscommunication of volume. Company investigation is on going and a supplemental report will be submitted once the investigation is complete.

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