Incident details
Operator, cause, commodity and consequences with raw source fields.
GTG incident on 2025-07-01 — NY
Operator
National Fuel Gas Supply Corp
Cause
Other Incident Cause
Commodity
Natural Gas
Program
GTG
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$750,000
Incident datetime
2025-07-01 00:00 UTC
Report number
Location
NY
Narrative
National fuel gas supply corporation (�national fuel�) is reporting this natural gas incident as a result of an unintentional release of gas, which resulted in property damage with estimated costs in excess of the applicable $145,400 threshold outlined in 49 c.F.R. � 191.3(1)(ii) and occurring on national fuel�s f1s pipeline in the town of limestone, cattaraugus county, ny (�line f1s�). On sunday, june 1, 2025, at approximately 12:11pm, national fuel gas control operations center received an alarm due to a pressure drop on line f1s. At approximately 12:14pm, the pressure drop triggered a compressor unit shutdown at limestone compressor station, which isolated the compressor station from line f1s. National fuel promptly mobilized operations to investigate. At approximately 1:06pm, national fuel arrived at limestone compressor station to begin the investigation into the cause of the alarm, and, although a potential source of the alarm was not yet discovered, as a precautionary action, closed valve cpc113 at limestone station, which is immediately upstream of line f1s. At approximately 1:36pm, the downstream valve on line f1s (valve rhc111) was closed to isolate line f1s. Out of an abundance of caution, at approximately 2:46pm, national fuel notified the nrc of a potential rupture. After line f1s was isolated, national fuel patrolled line f1s, and, at approximately 3:16pm, confirmed a rupture on line f1s near the crossing of rice brook within allegany state park (gps coordinates 42.0603, -78.69133). Upon excavating and removing the ruptured section of line f1s, it was determined that the rupture occurred along the longitudinal seam of an approximately 50-foot joint of pipe and arrested 2-3 inches beyond the girth weld in both directions. The longitudinal seam was oriented at the 6:00 o�clock pipe position. The rice brook flowed above line f1s through two parallel corrugated metal culvert pipes, which were damaged as a result of the rupture. The flow of rice brook was temporarily disrupted, but later re-established with minimal environmental impacts. The ruptured section of line f1s was sent to a laboratory for root cause failure analysis, which has not yet been completed. Thus, the root cause of the rupture is unknown at this time. Line f1s was repaired by replacing approximately 60 feet of 6-inch od, 0.280-inch wall, grade x-52 steel pipe which was pressure tested to >1.5 x maop. No injuries or fatalities resulted from the rupture.
Detailed record list
Report Received Date
2025-07-01 00:00:00
Iyear
2025
Report Number
20250074
Supplemental Number
41157
Report Type
Supplemental
Operator Id
13063
Name
National Fuel Gas Supply Corp
Operator Street Address
6363 Main Street
Operator City Name
Williamsville
Operator State Abbreviation
NY
Operator Postal Code
14221-5887
Time Zone
Eastern
Daylight Savings Ind
Yes
Location Latitude
42.06016
Location Longitude
-78.69097
Nrc Rpt Num
1432793
Additional Nrc Report Numbers
1432808
Commodity Released Type
Natural Gas
Unintentional Release
1621
Intentional Release
342
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
Yes
Still Shutdown Ind
Yes
Communication State Fed Ind
No
Ignite Ind
No
Upstream Action Taken
Valve Closure
Downstream Action Taken
Valve Closure
Num Pub Evacuated
0
On Off Shore
Onshore
Onshore State Abbreviation
Ny
Onshore Postal Code
14753
Onshore City Name
Limestone
Onshore County Name
Cattaraugus
Designated Location
Survey Station No.
Designated Name
12645
Pipe Fac Name
F1s
Segment Name
Rice Brook Crossing
Federal
No
Location Type
Pipeline Right-Of-Way
Incident Area Type
Underground
Incident Area Subtype
Under Soil
Depth Of Cover
90
Other Underground Facilities
No
Crossing
Yes
Water Crossing Ind
Yes
Water Type
Uncased
Water Name
Rice Brook
Water Depth
Unknown
Water Subtype
Below Water, Pipe Buried Below Bottom (Not In Bored/drilled Crossing)
Crossing 100 Feet
No
Pipe Facility Type
Interstate
System Part Involved
Onshore Pipeline, Including Valve Sites
Item Involved
Pipe
Pipe Type
Pipe Seam
Pipe Diameter
6
Pipe Wall Thickness
0.188
Pipe Smys
35000
Pipe Specification
Api 5l
Pipe Seam Type
Longitudinal Erw - Unknown Frequency
Pipe Manufacturer
Bethlehem Steel
Pipe Coating Type
Extruded Polyehylene
Coating Applied Ind
No
Installation Year
1966
Manufactured Year
1966
Material Involved
Carbon Steel
Release Type
Rupture
Rupture Orient
Longitudinal
Rupture Length
602
Rupture Width
17
Class Location Type
Class 1 Location
Could Be Hca
No
Pir Radius
157
Heat Damage Ind
No
Non Heat Damage Ind
No
Did Occur In Mca Ind
No
Est Cost Oper Paid
0
Est Cost Unintentional Release
3915
Est Cost Intentional Release
826
Est Cost Prop Damage
750000
Est Cost Emergency
457
Est Cost Other
205508
Est Cost Other Details
F2s: Direct Examination F1s: Lab Failure Analysis, Chemical Cleaning, Ili.
Gas Cost In Mcf
2.415
Prpty
960706
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
Yes
Fish Aquatic Impact Ind
Yes
Accident Psig
1353
Gas Flow In Pipe In Mcf
6614
Mop Psig
1440
Mop Cfr Section
192.619(A)(1)
Maop Established Date
1990-04-20 00:00:00
Maop Reversal Flow Ind
Bi-Directional
Accident Pressure
Pressure Did Not Exceed Maop
Pressure Restriction Ind
No
Gas Required Odorized Ind
No
Upstream Valve Type Ind
Automatic
Downstream Valve Type Ind
Manual
Length Segment Isolated
17650
Internal Inspection Ind
Yes
Operation Complications Ind
Yes
Excessive Debris Ind
Yes
Pipeline Function
Transmission In Storage Field
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
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
Rupture occurred during normal operations within pipeline maop.
Employee Drug Test Ind
No
Contractor Drug Test Ind
No
Cause
Other Incident Cause
Cause Details
Unknown
Other Type
Unknown
Unknown Subtype
Still Under Investigation, Cause Of Incident To Be Determined* (*supplemental Report Required)
Preparer Name
J**** M*****
Preparer Title
Integrity Engineer
Preparer Email
M*******@n******.com
Preparer Telephone
8148718683
Authorizer Name
R*** B******
Authorizer Title
Superintendent
Authorizer Telephone
7168272106
Authorizer Email
B*******@n******.com
Narrative
National fuel gas supply corporation (�national fuel�) is reporting this natural gas incident as a result of an unintentional release of gas, which resulted in property damage with estimated costs in excess of the applicable $145,400 threshold outlined in 49 c.F.R. � 191.3(1)(ii) and occurring on national fuel�s f1s pipeline in the town of limestone, cattaraugus county, ny (�line f1s�). On sunday, june 1, 2025, at approximately 12:11pm, national fuel gas control operations center received an alarm due to a pressure drop on line f1s. At approximately 12:14pm, the pressure drop triggered a compressor unit shutdown at limestone compressor station, which isolated the compressor station from line f1s. National fuel promptly mobilized operations to investigate. At approximately 1:06pm, national fuel arrived at limestone compressor station to begin the investigation into the cause of the alarm, and, although a potential source of the alarm was not yet discovered, as a precautionary action, closed valve cpc113 at limestone station, which is immediately upstream of line f1s. At approximately 1:36pm, the downstream valve on line f1s (valve rhc111) was closed to isolate line f1s. Out of an abundance of caution, at approximately 2:46pm, national fuel notified the nrc of a potential rupture. After line f1s was isolated, national fuel patrolled line f1s, and, at approximately 3:16pm, confirmed a rupture on line f1s near the crossing of rice brook within allegany state park (gps coordinates 42.0603, -78.69133). Upon excavating and removing the ruptured section of line f1s, it was determined that the rupture occurred along the longitudinal seam of an approximately 50-foot joint of pipe and arrested 2-3 inches beyond the girth weld in both directions. The longitudinal seam was oriented at the 6:00 o�clock pipe position. The rice brook flowed above line f1s through two parallel corrugated metal culvert pipes, which were damaged as a result of the rupture. The flow of rice brook was temporarily disrupted, but later re-established with minimal environmental impacts. The ruptured section of line f1s was sent to a laboratory for root cause failure analysis, which has not yet been completed. Thus, the root cause of the rupture is unknown at this time. Line f1s was repaired by replacing approximately 60 feet of 6-inch od, 0.280-inch wall, grade x-52 steel pipe which was pressure tested to >1.5 x maop. No injuries or fatalities resulted from the rupture.
| Report Received Date | 2025-07-01 00:00:00 |
|---|---|
| Iyear | 2025 |
| Report Number | 20250074 |
| Supplemental Number | 41157 |
| Report Type | Supplemental |
| Operator Id | 13063 PHMSA Enforcement |
| Name | National Fuel Gas Supply Corp |
| Operator Street Address | 6363 Main Street |
| Operator City Name | Williamsville |
| Operator State Abbreviation | NY |
| Operator Postal Code | 14221-5887 |
| Time Zone | Eastern |
| Daylight Savings Ind | Yes |
| Location Latitude | 42.06016 Google Maps OpenStreetMap |
| Location Longitude | -78.69097 Google Maps OpenStreetMap |
| Nrc Rpt Num | 1432793 NRC Report How to search |
| Additional Nrc Report Numbers | 1432808 |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 1621 |
| Intentional Release | 342 |
| 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 | Yes |
| Still Shutdown Ind | Yes |
| Communication State Fed Ind | No |
| Ignite Ind | No |
| Upstream Action Taken | Valve Closure |
| Downstream Action Taken | Valve Closure |
| Num Pub Evacuated | 0 |
| On Off Shore | Onshore |
| Onshore State Abbreviation | Ny |
| Onshore Postal Code | 14753 |
| Onshore City Name | Limestone |
| Onshore County Name | Cattaraugus |
| Designated Location | Survey Station No. |
| Designated Name | 12645 |
| Pipe Fac Name | F1s |
| Segment Name | Rice Brook Crossing |
| Federal | No |
| Location Type | Pipeline Right-Of-Way |
| Incident Area Type | Underground |
| Incident Area Subtype | Under Soil |
| Depth Of Cover | 90 |
| Other Underground Facilities | No |
| Crossing | Yes |
| Water Crossing Ind | Yes |
| Water Type | Uncased |
| Water Name | Rice Brook |
| Water Depth | Unknown |
| Water Subtype | Below Water, Pipe Buried Below Bottom (Not In Bored/drilled Crossing) |
| Crossing 100 Feet | No |
| Pipe Facility Type | Interstate |
| System Part Involved | Onshore Pipeline, Including Valve Sites |
| Item Involved | Pipe |
| Pipe Type | Pipe Seam |
| Pipe Diameter | 6 |
| Pipe Wall Thickness | 0.188 |
| Pipe Smys | 35000 |
| Pipe Specification | Api 5l |
| Pipe Seam Type | Longitudinal Erw - Unknown Frequency |
| Pipe Manufacturer | Bethlehem Steel |
| Pipe Coating Type | Extruded Polyehylene |
| Coating Applied Ind | No |
| Installation Year | 1966 |
| Manufactured Year | 1966 |
| Material Involved | Carbon Steel |
| Release Type | Rupture |
| Rupture Orient | Longitudinal |
| Rupture Length | 602 |
| Rupture Width | 17 |
| Class Location Type | Class 1 Location |
| Could Be Hca | No |
| Pir Radius | 157 |
| Heat Damage Ind | No |
| Non Heat Damage Ind | No |
| Did Occur In Mca Ind | No |
| Est Cost Oper Paid | 0 |
| Est Cost Unintentional Release | 3915 |
| Est Cost Intentional Release | 826 |
| Est Cost Prop Damage | 750000 |
| Est Cost Emergency | 457 |
| Est Cost Other | 205508 |
| Est Cost Other Details | F2s: Direct Examination F1s: Lab Failure Analysis, Chemical Cleaning, Ili. |
| Gas Cost In Mcf | 2.415 |
| Prpty | 960706 |
| 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 | Yes |
| Fish Aquatic Impact Ind | Yes |
| Accident Psig | 1353 |
| Gas Flow In Pipe In Mcf | 6614 |
| Mop Psig | 1440 |
| Mop Cfr Section | 192.619(A)(1) View CFR 49 §192 |
| Maop Established Date | 1990-04-20 00:00:00 |
| Maop Reversal Flow Ind | Bi-Directional |
| Accident Pressure | Pressure Did Not Exceed Maop |
| Pressure Restriction Ind | No |
| Gas Required Odorized Ind | No |
| Upstream Valve Type Ind | Automatic |
| Downstream Valve Type Ind | Manual |
| Length Segment Isolated | 17650 |
| Internal Inspection Ind | Yes |
| Operation Complications Ind | Yes |
| Excessive Debris Ind | Yes |
| Pipeline Function | Transmission In Storage Field |
| 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 | 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 | Rupture occurred during normal operations within pipeline maop. |
| Employee Drug Test Ind | No |
| Contractor Drug Test Ind | No |
| Cause | Other Incident Cause |
| Cause Details | Unknown |
| Other Type | Unknown |
| Unknown Subtype | Still Under Investigation, Cause Of Incident To Be Determined* (*supplemental Report Required) |
| Preparer Name | J**** M***** |
| Preparer Title | Integrity Engineer |
| Preparer Email | M*******@n******.com |
| Preparer Telephone | 8148718683 |
| Authorizer Name | R*** B****** |
| Authorizer Title | Superintendent |
| Authorizer Telephone | 7168272106 |
| Authorizer Email | B*******@n******.com |
| Narrative | National fuel gas supply corporation (�national fuel�) is reporting this natural gas incident as a result of an unintentional release of gas, which resulted in property damage with estimated costs in excess of the applicable $145,400 threshold outlined in 49 c.F.R. � 191.3(1)(ii) and occurring on national fuel�s f1s pipeline in the town of limestone, cattaraugus county, ny (�line f1s�). On sunday, june 1, 2025, at approximately 12:11pm, national fuel gas control operations center received an alarm due to a pressure drop on line f1s. At approximately 12:14pm, the pressure drop triggered a compressor unit shutdown at limestone compressor station, which isolated the compressor station from line f1s. National fuel promptly mobilized operations to investigate. At approximately 1:06pm, national fuel arrived at limestone compressor station to begin the investigation into the cause of the alarm, and, although a potential source of the alarm was not yet discovered, as a precautionary action, closed valve cpc113 at limestone station, which is immediately upstream of line f1s. At approximately 1:36pm, the downstream valve on line f1s (valve rhc111) was closed to isolate line f1s. Out of an abundance of caution, at approximately 2:46pm, national fuel notified the nrc of a potential rupture. After line f1s was isolated, national fuel patrolled line f1s, and, at approximately 3:16pm, confirmed a rupture on line f1s near the crossing of rice brook within allegany state park (gps coordinates 42.0603, -78.69133). Upon excavating and removing the ruptured section of line f1s, it was determined that the rupture occurred along the longitudinal seam of an approximately 50-foot joint of pipe and arrested 2-3 inches beyond the girth weld in both directions. The longitudinal seam was oriented at the 6:00 o�clock pipe position. The rice brook flowed above line f1s through two parallel corrugated metal culvert pipes, which were damaged as a result of the rupture. The flow of rice brook was temporarily disrupted, but later re-established with minimal environmental impacts. The ruptured section of line f1s was sent to a laboratory for root cause failure analysis, which has not yet been completed. Thus, the root cause of the rupture is unknown at this time. Line f1s was repaired by replacing approximately 60 feet of 6-inch od, 0.280-inch wall, grade x-52 steel pipe which was pressure tested to >1.5 x maop. No injuries or fatalities resulted from the rupture. |
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