Incident details
Operator, cause, commodity and consequences with raw source fields.
HL incident on 2025-05-31 — OH
Operator
Marathon Pipe Line Llc
Cause
Incorrect Operation
Commodity
Refined And/or Petroleum Product (Non-Hvl) Which Is A Liquid At Ambient Conditions
Program
HL
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$500
Incident datetime
2025-05-31 13:44
Report number
Location
OH
Narrative
On may 31st, 2025, a third party notified the pipeline operations center of a release at burley station at 13:44. The line was down and station was isolated at 13:59. Responding personnel discovered thermal reliefs on the pig launcher and receiver were discharging to atmosphere and containment. At this time the accident cause is still under investigation. Supplemental update: the station pig launcher and receiver, both equipped with thermal pressure relief valves (tprv) with relief setpoints of 1,200 psi, were exposed to the sustained mainline pressure and began relieving. The tprvs were both designed with tubing routed to secondary concrete containment draining to the sump. The sustained high pressure and turbulent flow through the tprvs caused both tubes to shift out of the secondary containment, the launcher tprv cap came off, releasing to the atmosphere, and the tubing separated from the receiver tprv, also releasing to the atmosphere. Investigation revealed that the design of the trpv discharge tubing was intended to handle smaller, low-pressure volumes rather than sustained high-pressure flow. The investigation found that the mainline pressure relief valve may have been relieving at a higher pressure due to metal galling-induced drift. Mpl has replaced the mainline valve. The investigation revealed that operations had a historical practice of leaving the kicker valve (is016) open on the launcher to manage thermal pressure, and that the bypass valve on the receiver (is020) was allowing pressure to pass and was scheduled for replacement. These conditions allowed the mainline pressure and higher volume to enter the pig launcher and receiver. The accident response consists solely of long-term remediation and/or monitoring, conducted under the auspices of an authorized governmental agency or entity. Mpl entered into a consent agreement with the state of idaho. The site also has historic contamination from a release prior to mpl ownership. The costs of the ongoing remediation have been updated.
Detailed record list
Report Received Date
2025-06-18 00:00:00
Iyear
2025
Report Number
20250150
Supplemental Number
41559
Report Type
Supplemental Final
Operator Id
32147
Name
Marathon Pipe Line Llc
Operator Street Address
539 South Main Street
Operator City Name
Findlay
Operator State Abbreviation
OH
Operator Postal Code
45840
Local Datetime
2025-05-31 12:39:00
Time Zone
Mountain
Daylight Savings Ind
Yes
Location Latitude
42.51633
Location Longitude
-113.710578
Commodity Released Type
Refined And/or Petroleum Product (Non-Hvl) Which Is A Liquid At Ambient Conditions
Commodity Subtype
Gasoline (Non-Ethanol)
Unintentional Release Bbls
85
Recovered Bbls
0
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Accident Identifier
Other
Accident Details
3rd Party Operator Of Adjacent Station
Incident Identified Datetime
2025-05-31 13:44:00
System Part Involved
Onshore Pump/meter Station Equipment And Piping
On Off Shore
Onshore
Status When Identified
Normal Operation, Includes Pauses Between Batches And During Maintenance
Shutdown Due Accident Ind
Yes
Shutdown Datetime
2025-05-31 13:48:00
Restart Datetime
2025-05-31 18:40:00
Communication State Fed Ind
No
On Site Datetime
2025-05-31 14:05:00
Confirmed Discovery Datetime
2025-05-31 14:05:00
Nrc Rpt Num
Nrc Notification Not Required
Ignite Ind
No
Notify Qualified Indiv Ind
Yes
Qualified Indiv Notif Datetime
2025-05-31 14:15:00
Oil Spill Removal Org Ind
No
Num Pub Evacuated
0
Pipe Fac Name
Salt Lake City - Boise 8" Products (Nwps)
Segment Name
Burley - Murtaugh #2-8"
Onshore State Abbreviation
Id
Onshore Postal Code
83318
Onshore City Name
Not Within A Municipality
Onshore County Name
Cassia
Designated Location
Survey Station No.
Designated Name
Burley Statio
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
Interstate
Item Involved
Relief Line And Relief Equipment
Installation Year
2017
Manufactured Year
2016
Material Involved
Material Other Than Carbon Steel
Material Details
Stainless Steel
Release Type
Leak
Leak Type
Other
Leak Type Other
Circumferential Tubing Crack
Wildlife Impact Ind
No
Soil Contamination
Yes
Long Term Assessment
Yes
Remediation Ind
Yes
Soil Remed Ind
Yes
Water Contam Ind
No
Could Be Hca
Yes
Commodity Reached Hca
Yes
Usa Drinking Ind
Yes
Usa Drinking Yes No
Yes
Est Cost Oper Paid
0
Est Cost Gas Released
10700
Est Cost Prop Damage
500
Est Cost Emergency
0
Est Cost Environmental
138000
Est Cost Other
0
Prpty
149200
Num Persons Hosp Not Ovnght
0
Num Injured Treated By Emt
0
Num Resident Building Affctd
0
Num Business Building Affctd
0
Accident Psig
1226
Mop Psig
2000
Mop Cfr Section
Component Design Pressure �195.406(A)(2)
Maop Established Date
2016-11-01 00:00:00
Maop Reversal Flow Ind
No
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
No
Scada Conf Ind
No
Cpm In Place Ind
Yes
Cpm Operating Ind
Yes
Cpm Functional Ind
Yes
Cpm Detection Ind
Yes
Cpm Conf Ind
Yes
Investigation Status
Yes, specify investigation result(s): (select all that apply)
Invest Schedule Ind
Yes
Invest No Control Room Ind
Yes
Invest No Controller Ind
Yes
Employee Drug Test Ind
Yes
Contractor Drug Test Ind
No
Num Employees Tested
1
Num Employees Failed
0
Cause
Incorrect Operation
Cause Details
Valve Left Or Placed In Wrong Position, But Not Resulting In A Tank, Vessel, Or Sump/separator Overflow Or Facility Overpressure
Operation Type
Valve Left Or Placed In Wrong Position, But Not Resulting In A Tank, Vessel, Or Sump/separator Overflow Or Facility Overpressure
Related Failure Follow Ind
Yes
Category Type
Normal Operating Conditions
Operator Qualification Ind
Yes
Qualified Individuals
Yes, They Were Qualified For The Task(S)
Other Type
Unknown
Unknown Subtype
Still Under Investigation, Cause Of Accident To Be Determined* (*supplemental Report Required)
Eqf Control Releaf Ind
Yes
Io Valve Position Ind
Yes
Io Wrong Equipment Ind
Yes
Io Follow Procedure Ind
Yes
Preparer Name
Z*** C*********
Preparer Title
Compliance Specialist
Preparer Email
Z***********@m****************.com
Preparer Telephone
4196726607
Prepared Date
2025-11-07 00:00:00
Authorizer Name
M****** G***
Authorizer Telephone
4194214505
Authorizer Title
Ess And Compliance Director
Authorizer Email
M*****@m****************.com
Narrative
On may 31st, 2025, a third party notified the pipeline operations center of a release at burley station at 13:44. The line was down and station was isolated at 13:59. Responding personnel discovered thermal reliefs on the pig launcher and receiver were discharging to atmosphere and containment. At this time the accident cause is still under investigation. Supplemental update: the station pig launcher and receiver, both equipped with thermal pressure relief valves (tprv) with relief setpoints of 1,200 psi, were exposed to the sustained mainline pressure and began relieving. The tprvs were both designed with tubing routed to secondary concrete containment draining to the sump. The sustained high pressure and turbulent flow through the tprvs caused both tubes to shift out of the secondary containment, the launcher tprv cap came off, releasing to the atmosphere, and the tubing separated from the receiver tprv, also releasing to the atmosphere. Investigation revealed that the design of the trpv discharge tubing was intended to handle smaller, low-pressure volumes rather than sustained high-pressure flow. The investigation found that the mainline pressure relief valve may have been relieving at a higher pressure due to metal galling-induced drift. Mpl has replaced the mainline valve. The investigation revealed that operations had a historical practice of leaving the kicker valve (is016) open on the launcher to manage thermal pressure, and that the bypass valve on the receiver (is020) was allowing pressure to pass and was scheduled for replacement. These conditions allowed the mainline pressure and higher volume to enter the pig launcher and receiver. The accident response consists solely of long-term remediation and/or monitoring, conducted under the auspices of an authorized governmental agency or entity. Mpl entered into a consent agreement with the state of idaho. The site also has historic contamination from a release prior to mpl ownership. The costs of the ongoing remediation have been updated.
| Report Received Date | 2025-06-18 00:00:00 |
|---|---|
| Iyear | 2025 |
| Report Number | 20250150 |
| Supplemental Number | 41559 |
| Report Type | Supplemental Final |
| Operator Id | 32147 PHMSA Enforcement |
| Name | Marathon Pipe Line Llc |
| Operator Street Address | 539 South Main Street |
| Operator City Name | Findlay |
| Operator State Abbreviation | OH |
| Operator Postal Code | 45840 |
| Local Datetime | 2025-05-31 12:39:00 |
| Time Zone | Mountain |
| Daylight Savings Ind | Yes |
| Location Latitude | 42.51633 Google Maps OpenStreetMap |
| Location Longitude | -113.710578 Google Maps OpenStreetMap |
| Commodity Released Type | Refined And/or Petroleum Product (Non-Hvl) Which Is A Liquid At Ambient Conditions |
| Commodity Subtype | Gasoline (Non-Ethanol) |
| Unintentional Release Bbls | 85 |
| Recovered Bbls | 0 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Accident Identifier | Other |
| Accident Details | 3rd Party Operator Of Adjacent Station |
| Incident Identified Datetime | 2025-05-31 13:44:00 |
| System Part Involved | Onshore Pump/meter Station Equipment And Piping |
| On Off Shore | Onshore |
| Status When Identified | Normal Operation, Includes Pauses Between Batches And During Maintenance |
| Shutdown Due Accident Ind | Yes |
| Shutdown Datetime | 2025-05-31 13:48:00 |
| Restart Datetime | 2025-05-31 18:40:00 |
| Communication State Fed Ind | No |
| On Site Datetime | 2025-05-31 14:05:00 |
| Confirmed Discovery Datetime | 2025-05-31 14:05:00 |
| Nrc Rpt Num | Nrc Notification Not Required NRC Report How to search |
| Ignite Ind | No |
| Notify Qualified Indiv Ind | Yes |
| Qualified Indiv Notif Datetime | 2025-05-31 14:15:00 |
| Oil Spill Removal Org Ind | No |
| Num Pub Evacuated | 0 |
| Pipe Fac Name | Salt Lake City - Boise 8" Products (Nwps) |
| Segment Name | Burley - Murtaugh #2-8" |
| Onshore State Abbreviation | Id |
| Onshore Postal Code | 83318 |
| Onshore City Name | Not Within A Municipality |
| Onshore County Name | Cassia |
| Designated Location | Survey Station No. |
| Designated Name | Burley Statio |
| 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 | Interstate |
| Item Involved | Relief Line And Relief Equipment |
| Installation Year | 2017 |
| Manufactured Year | 2016 |
| Material Involved | Material Other Than Carbon Steel |
| Material Details | Stainless Steel |
| Release Type | Leak |
| Leak Type | Other |
| Leak Type Other | Circumferential Tubing Crack |
| Wildlife Impact Ind | No |
| Soil Contamination | Yes |
| Long Term Assessment | Yes |
| Remediation Ind | Yes |
| Soil Remed Ind | Yes |
| Water Contam Ind | No |
| Could Be Hca | Yes |
| Commodity Reached Hca | Yes |
| Usa Drinking Ind | Yes |
| Usa Drinking Yes No | Yes |
| Est Cost Oper Paid | 0 |
| Est Cost Gas Released | 10700 |
| Est Cost Prop Damage | 500 |
| Est Cost Emergency | 0 |
| Est Cost Environmental | 138000 |
| Est Cost Other | 0 |
| Prpty | 149200 |
| Num Persons Hosp Not Ovnght | 0 |
| Num Injured Treated By Emt | 0 |
| Num Resident Building Affctd | 0 |
| Num Business Building Affctd | 0 |
| Accident Psig | 1226 |
| Mop Psig | 2000 |
| Mop Cfr Section | Component Design Pressure �195.406(A)(2) View CFR 49 §192 |
| Maop Established Date | 2016-11-01 00:00:00 |
| Maop Reversal Flow Ind | No |
| 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 | No |
| Scada Conf Ind | No |
| Cpm In Place Ind | Yes |
| Cpm Operating Ind | Yes |
| Cpm Functional Ind | Yes |
| Cpm Detection Ind | Yes |
| Cpm Conf Ind | Yes |
| Investigation Status | Yes, specify investigation result(s): (select all that apply) |
| Invest Schedule Ind | Yes |
| Invest No Control Room Ind | Yes |
| Invest No Controller Ind | Yes |
| Employee Drug Test Ind | Yes |
| Contractor Drug Test Ind | No |
| Num Employees Tested | 1 |
| Num Employees Failed | 0 |
| Cause | Incorrect Operation |
| Cause Details | Valve Left Or Placed In Wrong Position, But Not Resulting In A Tank, Vessel, Or Sump/separator Overflow Or Facility Overpressure |
| Operation Type | Valve Left Or Placed In Wrong Position, But Not Resulting In A Tank, Vessel, Or Sump/separator Overflow Or Facility Overpressure |
| Related Failure Follow Ind | Yes |
| Category Type | Normal Operating Conditions |
| Operator Qualification Ind | Yes |
| Qualified Individuals | Yes, They Were Qualified For The Task(S) |
| Other Type | Unknown |
| Unknown Subtype | Still Under Investigation, Cause Of Accident To Be Determined* (*supplemental Report Required) |
| Eqf Control Releaf Ind | Yes |
| Io Valve Position Ind | Yes |
| Io Wrong Equipment Ind | Yes |
| Io Follow Procedure Ind | Yes |
| Preparer Name | Z*** C********* |
| Preparer Title | Compliance Specialist |
| Preparer Email | Z***********@m****************.com |
| Preparer Telephone | 4196726607 |
| Prepared Date | 2025-11-07 00:00:00 |
| Authorizer Name | M****** G*** |
| Authorizer Telephone | 4194214505 |
| Authorizer Title | Ess And Compliance Director |
| Authorizer Email | M*****@m****************.com |
| Narrative | On may 31st, 2025, a third party notified the pipeline operations center of a release at burley station at 13:44. The line was down and station was isolated at 13:59. Responding personnel discovered thermal reliefs on the pig launcher and receiver were discharging to atmosphere and containment. At this time the accident cause is still under investigation. Supplemental update: the station pig launcher and receiver, both equipped with thermal pressure relief valves (tprv) with relief setpoints of 1,200 psi, were exposed to the sustained mainline pressure and began relieving. The tprvs were both designed with tubing routed to secondary concrete containment draining to the sump. The sustained high pressure and turbulent flow through the tprvs caused both tubes to shift out of the secondary containment, the launcher tprv cap came off, releasing to the atmosphere, and the tubing separated from the receiver tprv, also releasing to the atmosphere. Investigation revealed that the design of the trpv discharge tubing was intended to handle smaller, low-pressure volumes rather than sustained high-pressure flow. The investigation found that the mainline pressure relief valve may have been relieving at a higher pressure due to metal galling-induced drift. Mpl has replaced the mainline valve. The investigation revealed that operations had a historical practice of leaving the kicker valve (is016) open on the launcher to manage thermal pressure, and that the bypass valve on the receiver (is020) was allowing pressure to pass and was scheduled for replacement. These conditions allowed the mainline pressure and higher volume to enter the pig launcher and receiver. The accident response consists solely of long-term remediation and/or monitoring, conducted under the auspices of an authorized governmental agency or entity. Mpl entered into a consent agreement with the state of idaho. The site also has historic contamination from a release prior to mpl ownership. The costs of the ongoing remediation have been updated. |
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