HL incident on 2025-10-20 — TX

Operator
Seadrift Pipeline Llc
Cause
Incorrect Operation
Commodity
Hvl Or Other Flammable Or Toxic Fluid Which Is A Gas At Ambient Conditions
Program
HL
Damage and Injuries
0 fatalities 0 injuries
Property damage (nominal)
$0
Incident datetime
2025-10-20 15:45
Report number
Location
TX
Narrative
After maintenance/imp inspection of the e-2 west, the recommissioning procedure called for an analyzer technician to be at the station 14 miles upstream of the station where the flare and muffler were located. Based on interface detection the pipeline technicians would know when to swap valves from the muffler to the flare. A decision was made to move the analyzer tech downstream to the location of the muffler/flare, thereby not providing sufficient time to detect interface and swap to flare. In lieu of having analyzer tech upstream, an lel meter was used to detect interface on the mainline valve bypass, however the bypass valve was in the closed position. This caused a missed interface resulting in an unanticipated arrival of the interface, which was released through the muffler for 2 minutes. During the release, gas detectors went into alarm and operators diverted the flow from the muffler to the flare.
Detailed record list
Report Received Date
2025-11-20 00:00:00
Iyear
2025
Report Number
20250267
Supplemental Number
41609
Report Type
Original
Operator Id
26086
PHMSA Enforcement
Name
Seadrift Pipeline Llc
Operator Street Address
1000 County Road 340
Operator City Name
Angleton
Operator State Abbreviation
TX
Operator Postal Code
77515
Local Datetime
2025-10-20 15:45:00
Time Zone
Central
Daylight Savings Ind
Yes
Location Latitude
28.995814
Google Maps OpenStreetMap
Location Longitude
-96.150821
Google Maps OpenStreetMap
Commodity Released Type
Hvl Or Other Flammable Or Toxic Fluid Which Is A Gas At Ambient Conditions
Commodity Subtype
Other Hvl
Commodity Details
Ethane
Unintentional Release Bbls
0.1
Intentional Release Bbls
6.8
Recovered Bbls
0
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Accident Identifier
Scada-Based Information (Such As Alarm(S), Alert(S), Event(S), And/or Volume Or Pack Calculations)
Incident Identified Datetime
2025-10-20 15:45:00
System Part Involved
Onshore Pump/meter Station Equipment And Piping
On Off Shore
Onshore
Status When Identified
Routine Start-Up
Shutdown Due Accident Ind
No
Shutdown Explain
During Maintenance Recommissioning
Communication State Fed Ind
No
On Site Datetime
2025-10-20 15:45:00
Confirmed Discovery Datetime
2025-10-20 15:45:00
Nrc Rpt Datetime
2025-10-20 17:45:00
Nrc Rpt Num
1445943
NRC Report How to search
Additional Nrc Report Numbers
1446111
Ignite Ind
No
Num Pub Evacuated
0
Pipe Fac Name
Markham Dome
Segment Name
Gcpl_e-2 West 6"
Onshore State Abbreviation
Tx
Onshore Postal Code
77456
Onshore City Name
Not Within A Municipality
Onshore County Name
Matagorda County
Designated Location
Survey Station No.
Designated Name
0.1
Federal
No
Location Type
Totally Contained On Operator-Controlled Property
Incident Area Type
Aboveground
Incident Area Subtype
Typical Aboveground Facility Piping Or Appurtenance
Crossing
No
Pipe Facility Type
Intrastate
Item Involved
Relief Line And Relief Equipment
Installation Year
1976
Manufactured Year
Unknown
Material Involved
Carbon Steel
Release Type
Other
Release Type Details
Maintenance Release During Recommissioning Of Pipeline After Imp Inspection.
Wildlife Impact Ind
No
Soil Contamination
No
Long Term Assessment
No
Remediation Ind
No
Water Contam Ind
No
Could Be Hca
No
Commodity Reached Hca
No
Est Cost Oper Paid
0
Est Cost Gas Released
250
Est Cost Prop Damage
0
Est Cost Emergency
0
Est Cost Environmental
0
Est Cost Other
0
Est Cost Other Details
No Remediation, No Damage, No Injury, No Death, No Evacuation, No Esd
Prpty
250
Num Persons Hosp Not Ovnght
0
Num Injured Treated By Emt
0
Num Resident Building Affctd
0
Num Business Building Affctd
0
Accident Psig
358
Mop Psig
2160
Mop Cfr Section
Subpart E Pressure Test �195.406(A)(3)
View CFR 49 §192
Maop Established Date
1976-07-01 00:00:00
Maop Reversal Flow Ind
Bi-Directional
Accident Pressure
Pressure Did Not Exceed Mop
Pressure Restriction Ind
No
Pipeline Function
> 20% Smys Regulated Transmission
Scada In Place Ind
Yes
Scada Operating Ind
Yes
Scada Functional Ind
Yes
Scada Detection Ind
Yes
Scada Conf Ind
Yes
Cpm In Place Ind
Yes
Cpm Operating Ind
Yes
Cpm Functional Ind
Yes
Cpm Detection Ind
Yes
Cpm Conf Ind
Yes
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
Maintenance release during recommissioning of pipeline.
Employee Drug Test Ind
No
Contractor Drug Test Ind
No
Cause
Incorrect Operation
Cause Details
Other Incorrect Operation
Operation Type
Other Incorrect Operation
Operation Details
Deviation From Procedure. Analyzer Tech Not At Correct Location To Identify The Product-Nitrogen Interface At The Appropriate Time In Order To Divert To Flare.
Related Failure Follow Ind
Yes
Category Type
Commissioning
Operator Qualification Ind
Yes
Qualified Individuals
Yes, They Were Qualified For The Task(S)
Io Valve Position Ind
Yes
Preparer Name
R**** G*****
Preparer Title
Regulatory Compliance Manager
Preparer Email
R*******@d**.com
Preparer Telephone
9792383469
Prepared Date
2025-11-20 00:00:00
Local Contact Name
D**** J****
Local Contact Email
D******@d**.com
Local Contact Telephone
7136543636
Authorizer Name
R**** G*****
Authorizer Telephone
9792383469
Authorizer Title
Regulatory Compliance Manager
Authorizer Email
R*******@d**.com
Narrative
After maintenance/imp inspection of the e-2 west, the recommissioning procedure called for an analyzer technician to be at the station 14 miles upstream of the station where the flare and muffler were located. Based on interface detection the pipeline technicians would know when to swap valves from the muffler to the flare. A decision was made to move the analyzer tech downstream to the location of the muffler/flare, thereby not providing sufficient time to detect interface and swap to flare. In lieu of having analyzer tech upstream, an lel meter was used to detect interface on the mainline valve bypass, however the bypass valve was in the closed position. This caused a missed interface resulting in an unanticipated arrival of the interface, which was released through the muffler for 2 minutes. During the release, gas detectors went into alarm and operators diverted the flow from the muffler to the flare.
Report Received Date 2025-11-20 00:00:00
Iyear 2025
Report Number 20250267
Supplemental Number 41609
Report Type Original
Operator Id 26086 PHMSA Enforcement
Name Seadrift Pipeline Llc
Operator Street Address 1000 County Road 340
Operator City Name Angleton
Operator State Abbreviation TX
Operator Postal Code 77515
Local Datetime 2025-10-20 15:45:00
Time Zone Central
Daylight Savings Ind Yes
Location Latitude 28.995814 Google Maps OpenStreetMap
Location Longitude -96.150821 Google Maps OpenStreetMap
Commodity Released Type Hvl Or Other Flammable Or Toxic Fluid Which Is A Gas At Ambient Conditions
Commodity Subtype Other Hvl
Commodity Details Ethane
Unintentional Release Bbls 0.1
Intentional Release Bbls 6.8
Recovered Bbls 0
Fatality Ind No
Fatal 0
Injury Ind No
Injure 0
Accident Identifier Scada-Based Information (Such As Alarm(S), Alert(S), Event(S), And/or Volume Or Pack Calculations)
Incident Identified Datetime 2025-10-20 15:45:00
System Part Involved Onshore Pump/meter Station Equipment And Piping
On Off Shore Onshore
Status When Identified Routine Start-Up
Shutdown Due Accident Ind No
Shutdown Explain During Maintenance Recommissioning
Communication State Fed Ind No
On Site Datetime 2025-10-20 15:45:00
Confirmed Discovery Datetime 2025-10-20 15:45:00
Nrc Rpt Datetime 2025-10-20 17:45:00
Nrc Rpt Num 1445943 NRC Report How to search
Additional Nrc Report Numbers 1446111
Ignite Ind No
Num Pub Evacuated 0
Pipe Fac Name Markham Dome
Segment Name Gcpl_e-2 West 6"
Onshore State Abbreviation Tx
Onshore Postal Code 77456
Onshore City Name Not Within A Municipality
Onshore County Name Matagorda County
Designated Location Survey Station No.
Designated Name 0.1
Federal No
Location Type Totally Contained On Operator-Controlled Property
Incident Area Type Aboveground
Incident Area Subtype Typical Aboveground Facility Piping Or Appurtenance
Crossing No
Pipe Facility Type Intrastate
Item Involved Relief Line And Relief Equipment
Installation Year 1976
Manufactured Year Unknown
Material Involved Carbon Steel
Release Type Other
Release Type Details Maintenance Release During Recommissioning Of Pipeline After Imp Inspection.
Wildlife Impact Ind No
Soil Contamination No
Long Term Assessment No
Remediation Ind No
Water Contam Ind No
Could Be Hca No
Commodity Reached Hca No
Est Cost Oper Paid 0
Est Cost Gas Released 250
Est Cost Prop Damage 0
Est Cost Emergency 0
Est Cost Environmental 0
Est Cost Other 0
Est Cost Other Details No Remediation, No Damage, No Injury, No Death, No Evacuation, No Esd
Prpty 250
Num Persons Hosp Not Ovnght 0
Num Injured Treated By Emt 0
Num Resident Building Affctd 0
Num Business Building Affctd 0
Accident Psig 358
Mop Psig 2160
Mop Cfr Section Subpart E Pressure Test �195.406(A)(3) View CFR 49 §192
Maop Established Date 1976-07-01 00:00:00
Maop Reversal Flow Ind Bi-Directional
Accident Pressure Pressure Did Not Exceed Mop
Pressure Restriction Ind No
Pipeline Function > 20% Smys Regulated Transmission
Scada In Place Ind Yes
Scada Operating Ind Yes
Scada Functional Ind Yes
Scada Detection Ind Yes
Scada Conf Ind Yes
Cpm In Place Ind Yes
Cpm Operating Ind Yes
Cpm Functional Ind Yes
Cpm Detection Ind Yes
Cpm Conf Ind Yes
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 Maintenance release during recommissioning of pipeline.
Employee Drug Test Ind No
Contractor Drug Test Ind No
Cause Incorrect Operation
Cause Details Other Incorrect Operation
Operation Type Other Incorrect Operation
Operation Details Deviation From Procedure. Analyzer Tech Not At Correct Location To Identify The Product-Nitrogen Interface At The Appropriate Time In Order To Divert To Flare.
Related Failure Follow Ind Yes
Category Type Commissioning
Operator Qualification Ind Yes
Qualified Individuals Yes, They Were Qualified For The Task(S)
Io Valve Position Ind Yes
Preparer Name R**** G*****
Preparer Title Regulatory Compliance Manager
Preparer Email R*******@d**.com
Preparer Telephone 9792383469
Prepared Date 2025-11-20 00:00:00
Local Contact Name D**** J****
Local Contact Email D******@d**.com
Local Contact Telephone 7136543636
Authorizer Name R**** G*****
Authorizer Telephone 9792383469
Authorizer Title Regulatory Compliance Manager
Authorizer Email R*******@d**.com
Narrative After maintenance/imp inspection of the e-2 west, the recommissioning procedure called for an analyzer technician to be at the station 14 miles upstream of the station where the flare and muffler were located. Based on interface detection the pipeline technicians would know when to swap valves from the muffler to the flare. A decision was made to move the analyzer tech downstream to the location of the muffler/flare, thereby not providing sufficient time to detect interface and swap to flare. In lieu of having analyzer tech upstream, an lel meter was used to detect interface on the mainline valve bypass, however the bypass valve was in the closed position. This caused a missed interface resulting in an unanticipated arrival of the interface, which was released through the muffler for 2 minutes. During the release, gas detectors went into alarm and operators diverted the flow from the muffler to the flare.
External Resources
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