Incident details
Operator, cause, commodity and consequences with raw source fields.
GTG incident on 2018-03-18 — WV
Operator
Dominion Energy Transmission, Inc.
Cause
Equipment Failure
Commodity
Natural Gas
Program
GTG
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$0
Incident datetime
2018-03-18 05:27
Report number
Location
WV
Narrative
Gas control received initial notification of this incident on 3/18/18 at 5:27 am and relayed the information to the on-duty operations supervisor. The on-duty operations supervisor dispatched operations personnel to mcilwain junction to investigate. Operations personnel arrived at mcilwain junction on 3/18/18 at 6:37 am and confirmed the unintentional release of gas from a relief valve on ln-26. The maximum allowable operating pressure of ln-26 is 945 psig. The operating pressure of ln-26 at the time of the incident was 678 psig. The purpose of the relief valve is to protect ln-26 from the maximum allowable operating pressure of ln-19. The maximum allowable operating pressure of ln-19 is 1000 psig. The operating pressure of ln-19 at the time of the incident was 677 psig. The operations personnel isolated the relief valve by closing the isolation valve at the inlet of the relief valve. The operations personnel visually inspected, operated, and verified the set point of the relief valve and determined that the relief valve was functioning properly. The operations personnel placed the relief valve back into service and opened the isolation valve on 3/18/18 at 8:10 am. It was determined on 3/18/18 at 7:59 am that the incident likely involved an unintentional estimated gas loss of three million cubic feet or more which would classify it as reportable. Initial telephonic notification was made to the national response center on 3/18/18 at 8:54 am. The national response center assigned incident report #1207068 to the initial notification of the incident. Additional telephonic notification was made to the national response center on 3/19/18 at 3:42 pm to confirm the initial telephonic notification and revise the estimate of the volume of gas unintentionally released by the relief valve. The national response center assigned incident report #1207203 for the additional notification of the incident.
Detailed record list
Report Received Date
2018-04-16 00:00:00
Iyear
2018
Report Number
20180040
Supplemental Number
30218
Report Type
Supplemental Final
Operator Id
2714
Name
Dominion Energy Transmission, Inc.
Operator Street Address
925 White Oaks Boulevard
Operator City Name
Bridgeport
Operator State Abbreviation
WV
Operator Postal Code
26330
Local Datetime
2018-03-18 05:37:00
Location Latitude
40.63194
Location Longitude
-79.44361
Nrc Rpt Num
1207068
Nrc Rpt Datetime
2018-03-18 08:54:00
Commodity Released Type
Natural Gas
Unintentional Release
20200
Intentional Release
0
Accompanying Liquid
0
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Shutdown Due Accident Ind
No
Shutdown Explain
Unintentional Release Of Gas From Relief Valve.
Ignite Ind
No
Explode Ind
No
Num Pub Evacuated
0
Incident Identified Datetime
2018-03-18 05:27:00
On Site Datetime
2018-03-18 06:37:00
On Off Shore
Onshore
Onshore State Abbreviation
Pa
Onshore Postal Code
15686
Onshore City Name
Spring Church
Onshore County Name
Armstrong
Designated Location
Milepost
Designated Name
Ga-26
Pipe Fac Name
Mcilwain Junction
Segment Name
Ln-26
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 Pipeline, Including Valve Sites
Item Involved
Valve
Valve Type
Relief Valve
Installation Year
Unknown
Material Involved
Carbon Steel
Release Type
Other
Release Type Details
Unintentional Release Of Gas From Relief Valve.
Class Location Type
Class 1 Location
Could Be Hca
No
Pir Radius
464
Heat Damage Ind
No
Non Heat Damage Ind
No
Hca Fatalities Ind
No
Est Cost Oper Paid
0
Est Cost Unintentional Release
43896
Est Cost Intentional Release
0
Est Cost Prop Damage
0
Est Cost Emergency
500
Est Cost Other
0
Prpty
44396
Accident Psig
678
Mop Psig
945
Mop Cfr Section
192.619(A)(2)
Accident Pressure
Pressure Did Not Exceed Maop
Pressure Restriction Ind
No
Upstream Valve Type Ind
Manual
Downstream Valve Type Ind
Manual
Internal Inspection Ind
Yes
Operation Complications Ind
No
Pipeline Function
Transmission System
Scada In Place Ind
Yes
Scada Operating Ind
Yes
Scada Functional Ind
Yes
Scada Detection Ind
No
Scada Conf Ind
No
Accident Identifier
Notification From Public
Investigation Status
No, the facility was not monitored by a controller(s) at the time of the incident
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
Relief Valve Nearing End Of Expected Service Life And Scheduled For Replacement.
Preparer Name
D***** S****
Preparer Title
Pipeline Integrity Engineer
Preparer Email
D*************@d*************.com
Preparer Telephone
6818423365
Authorizer Name
J***** C*****
Authorizer Title
Manager Pipeline Integrity
Authorizer Telephone
6818423633
Authorizer Email
J**************@d*************.com
Narrative
Gas control received initial notification of this incident on 3/18/18 at 5:27 am and relayed the information to the on-duty operations supervisor. The on-duty operations supervisor dispatched operations personnel to mcilwain junction to investigate. Operations personnel arrived at mcilwain junction on 3/18/18 at 6:37 am and confirmed the unintentional release of gas from a relief valve on ln-26. The maximum allowable operating pressure of ln-26 is 945 psig. The operating pressure of ln-26 at the time of the incident was 678 psig. The purpose of the relief valve is to protect ln-26 from the maximum allowable operating pressure of ln-19. The maximum allowable operating pressure of ln-19 is 1000 psig. The operating pressure of ln-19 at the time of the incident was 677 psig. The operations personnel isolated the relief valve by closing the isolation valve at the inlet of the relief valve. The operations personnel visually inspected, operated, and verified the set point of the relief valve and determined that the relief valve was functioning properly. The operations personnel placed the relief valve back into service and opened the isolation valve on 3/18/18 at 8:10 am. It was determined on 3/18/18 at 7:59 am that the incident likely involved an unintentional estimated gas loss of three million cubic feet or more which would classify it as reportable. Initial telephonic notification was made to the national response center on 3/18/18 at 8:54 am. The national response center assigned incident report #1207068 to the initial notification of the incident. Additional telephonic notification was made to the national response center on 3/19/18 at 3:42 pm to confirm the initial telephonic notification and revise the estimate of the volume of gas unintentionally released by the relief valve. The national response center assigned incident report #1207203 for the additional notification of the incident.
| Report Received Date | 2018-04-16 00:00:00 |
|---|---|
| Iyear | 2018 |
| Report Number | 20180040 |
| Supplemental Number | 30218 |
| Report Type | Supplemental Final |
| Operator Id | 2714 PHMSA Enforcement |
| Name | Dominion Energy Transmission, Inc. |
| Operator Street Address | 925 White Oaks Boulevard |
| Operator City Name | Bridgeport |
| Operator State Abbreviation | WV |
| Operator Postal Code | 26330 |
| Local Datetime | 2018-03-18 05:37:00 |
| Location Latitude | 40.63194 Google Maps OpenStreetMap |
| Location Longitude | -79.44361 Google Maps OpenStreetMap |
| Nrc Rpt Num | 1207068 NRC Report How to search |
| Nrc Rpt Datetime | 2018-03-18 08:54:00 |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 20200 |
| Intentional Release | 0 |
| Accompanying Liquid | 0 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Shutdown Due Accident Ind | No |
| Shutdown Explain | Unintentional Release Of Gas From Relief Valve. |
| Ignite Ind | No |
| Explode Ind | No |
| Num Pub Evacuated | 0 |
| Incident Identified Datetime | 2018-03-18 05:27:00 |
| On Site Datetime | 2018-03-18 06:37:00 |
| On Off Shore | Onshore |
| Onshore State Abbreviation | Pa |
| Onshore Postal Code | 15686 |
| Onshore City Name | Spring Church |
| Onshore County Name | Armstrong |
| Designated Location | Milepost |
| Designated Name | Ga-26 |
| Pipe Fac Name | Mcilwain Junction |
| Segment Name | Ln-26 |
| 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 Pipeline, Including Valve Sites |
| Item Involved | Valve |
| Valve Type | Relief Valve |
| Installation Year | Unknown |
| Material Involved | Carbon Steel |
| Release Type | Other |
| Release Type Details | Unintentional Release Of Gas From Relief Valve. |
| Class Location Type | Class 1 Location |
| Could Be Hca | No |
| Pir Radius | 464 |
| Heat Damage Ind | No |
| Non Heat Damage Ind | No |
| Hca Fatalities Ind | No |
| Est Cost Oper Paid | 0 |
| Est Cost Unintentional Release | 43896 |
| Est Cost Intentional Release | 0 |
| Est Cost Prop Damage | 0 |
| Est Cost Emergency | 500 |
| Est Cost Other | 0 |
| Prpty | 44396 |
| Accident Psig | 678 |
| Mop Psig | 945 |
| Mop Cfr Section | 192.619(A)(2) View CFR 49 §192 |
| Accident Pressure | Pressure Did Not Exceed Maop |
| Pressure Restriction Ind | No |
| Upstream Valve Type Ind | Manual |
| Downstream Valve Type Ind | Manual |
| Internal Inspection Ind | Yes |
| Operation Complications Ind | No |
| Pipeline Function | Transmission System |
| Scada In Place Ind | Yes |
| Scada Operating Ind | Yes |
| Scada Functional Ind | Yes |
| Scada Detection Ind | No |
| Scada Conf Ind | No |
| Accident Identifier | Notification From Public |
| Investigation Status | No, the facility was not monitored by a controller(s) at the time of the incident |
| 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 | Relief Valve Nearing End Of Expected Service Life And Scheduled For Replacement. |
| Preparer Name | D***** S**** |
| Preparer Title | Pipeline Integrity Engineer |
| Preparer Email | D*************@d*************.com |
| Preparer Telephone | 6818423365 |
| Authorizer Name | J***** C***** |
| Authorizer Title | Manager Pipeline Integrity |
| Authorizer Telephone | 6818423633 |
| Authorizer Email | J**************@d*************.com |
| Narrative | Gas control received initial notification of this incident on 3/18/18 at 5:27 am and relayed the information to the on-duty operations supervisor. The on-duty operations supervisor dispatched operations personnel to mcilwain junction to investigate. Operations personnel arrived at mcilwain junction on 3/18/18 at 6:37 am and confirmed the unintentional release of gas from a relief valve on ln-26. The maximum allowable operating pressure of ln-26 is 945 psig. The operating pressure of ln-26 at the time of the incident was 678 psig. The purpose of the relief valve is to protect ln-26 from the maximum allowable operating pressure of ln-19. The maximum allowable operating pressure of ln-19 is 1000 psig. The operating pressure of ln-19 at the time of the incident was 677 psig. The operations personnel isolated the relief valve by closing the isolation valve at the inlet of the relief valve. The operations personnel visually inspected, operated, and verified the set point of the relief valve and determined that the relief valve was functioning properly. The operations personnel placed the relief valve back into service and opened the isolation valve on 3/18/18 at 8:10 am. It was determined on 3/18/18 at 7:59 am that the incident likely involved an unintentional estimated gas loss of three million cubic feet or more which would classify it as reportable. Initial telephonic notification was made to the national response center on 3/18/18 at 8:54 am. The national response center assigned incident report #1207068 to the initial notification of the incident. Additional telephonic notification was made to the national response center on 3/19/18 at 3:42 pm to confirm the initial telephonic notification and revise the estimate of the volume of gas unintentionally released by the relief valve. The national response center assigned incident report #1207203 for the additional notification of the incident. |
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