Incident details
Operator, cause, commodity and consequences with raw source fields.
GTG incident on 2020-11-06 — TX
Operator
Anr Pipeline Co
Cause
Equipment Failure
Commodity
Natural Gas
Program
GTG
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$1,000
Incident datetime
2020-11-06 17:30
Report number
Location
TX
Narrative
On november 6 at 17:30 ct, anr pipeline's gas control received an emergency shutdown (esd) alarm at delhi compressor station located at 1984 hwy 80 w, delhi, la 71232 (32.46707, -91.59751). When the alarm was detected, a technician was dispatched to the compressor station to investigate. Upon arrival at the site at 17:40 ct, the technician discovered natural gas being released through the station's blowdown stacks. Immediate action was taken by verifying no emergency existed and closing the valves, which ended the release at 17:44 ct. Unintentional gas loss was calculated to 5.0 million cubic feet (mmcf). No property damage or injuries were documented, and no evacuations were required. Following the release, initial site inspections were completed to look for evidence of fire or other damage. No damage was observed, and the station was placed back into partial service at 23:00 ct on november 6. When the system activated, station isolation valve 501-13-25 failed to fully close resulting in the unintentional release of gas. Following the incident, valve 501-13-25 was removed from service for inspection. A poppet block valve, attached to the valve operator was removed, disassembled, and inspected for potential damage. Damaged and worn seals on the poppet valve were identified which prevented the valve from fully closing when actuated. The poppet block valves associated with valve 501-13-25 were cleaned and the seals were replaced. After repairing the valves, an esd system inspection was completed according to procedures on november 17, 2020. The test was initiated by triggering the flame detectors and then monitoring all emergency system valves for operations and timing. During the test, all system valves properly operated and fully closed.
Detailed record list
Report Received Date
2020-12-04 00:00:00
Iyear
2020
Report Number
20200129
Supplemental Number
34594
Report Type
Original Final
Operator Id
Name
Anr Pipeline Co
Operator Street Address
700 Louisiana Street Suite 700
Operator City Name
Houston
Operator State Abbreviation
TX
Operator Postal Code
77002
Local Datetime
2020-11-06 17:30:00
Time Zone
Central
Daylight Savings Ind
No
Location Latitude
32.46716
Location Longitude
-91.59778
Nrc Rpt Num
1291840
Nrc Rpt Datetime
2020-11-10 13:50:00
Additional Nrc Report Numbers
1291982
Commodity Released Type
Natural Gas
Unintentional Release
5000
Intentional Release
0
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
Shutdown Datetime
2020-11-06 17:44:00
Restart Datetime
2020-11-06 23:00:00
Communication State Fed Ind
Yes
Party Initiated Communication
Operator
Initial Responder Com Datetime
2020-11-06 17:30:00
Ignite Ind
No
Num Pub Evacuated
0
Incident Identified Datetime
2020-11-06 17:30:00
On Site Datetime
2020-11-06 17:40:00
On Off Shore
Onshore
Onshore State Abbreviation
La
Onshore Postal Code
71232
Onshore City Name
Delhi
Onshore County Name
Richland
Designated Location
Milepost
Designated Name
Mp 151.3
Pipe Fac Name
Delhi Compressor Station
Segment Name
Anr 501 Mainline
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
Esd System, But Excluding Product Drain Lines And Tubing
Installation Year
1956
Manufactured Year
Unknown
Material Involved
Carbon Steel
Release Type
Other
Release Type Details
Valve Failure
Class Location Type
Class 1 Location
Could Be Hca
No
Pir Radius
787
Heat Damage Ind
No
Non Heat Damage Ind
No
Est Cost Oper Paid
0
Est Cost Unintentional Release
13350
Est Cost Intentional Release
0
Est Cost Prop Damage
1000
Est Cost Emergency
0
Est Cost Other
0
Est Cost Other Details
None
Gas Cost In Mcf
2.67
Prpty
14350
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
786
Gas Flow In Pipe In Mcf
2000
Mop Psig
858
Mop Cfr Section
192.619(A)(3)
Maop Established Date
1967-07-26 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
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
The controller identified the issue via scada alarms and initiated a call-out of field operational personnel, who identified the incident and took corrective actions. Gas control does not have the capability to remotely close valves and therefore could prevent the incident through their actions.
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
Block Valve Ind
Yes
Esd System Failure Ind
Yes
Additional Erosion Wear Ind
Yes
Preparer Name
R**** R S*****
Preparer Title
Compliance Specialist
Preparer Email
R***********@t*******.com
Preparer Telephone
6154655123
Authorizer Name
E*** H*****
Authorizer Title
Senior Compliance Manager Usgo And Keystone
Authorizer Telephone
4024927447
Authorizer Email
E**********@t*******.com
Narrative
On november 6 at 17:30 ct, anr pipeline's gas control received an emergency shutdown (esd) alarm at delhi compressor station located at 1984 hwy 80 w, delhi, la 71232 (32.46707, -91.59751). When the alarm was detected, a technician was dispatched to the compressor station to investigate. Upon arrival at the site at 17:40 ct, the technician discovered natural gas being released through the station's blowdown stacks. Immediate action was taken by verifying no emergency existed and closing the valves, which ended the release at 17:44 ct. Unintentional gas loss was calculated to 5.0 million cubic feet (mmcf). No property damage or injuries were documented, and no evacuations were required. Following the release, initial site inspections were completed to look for evidence of fire or other damage. No damage was observed, and the station was placed back into partial service at 23:00 ct on november 6. When the system activated, station isolation valve 501-13-25 failed to fully close resulting in the unintentional release of gas. Following the incident, valve 501-13-25 was removed from service for inspection. A poppet block valve, attached to the valve operator was removed, disassembled, and inspected for potential damage. Damaged and worn seals on the poppet valve were identified which prevented the valve from fully closing when actuated. The poppet block valves associated with valve 501-13-25 were cleaned and the seals were replaced. After repairing the valves, an esd system inspection was completed according to procedures on november 17, 2020. The test was initiated by triggering the flame detectors and then monitoring all emergency system valves for operations and timing. During the test, all system valves properly operated and fully closed.
| Report Received Date | 2020-12-04 00:00:00 |
|---|---|
| Iyear | 2020 |
| Report Number | 20200129 |
| Supplemental Number | 34594 |
| Report Type | Original Final |
| Operator Id | 405 PHMSA Enforcement |
| Name | Anr Pipeline Co |
| Operator Street Address | 700 Louisiana Street Suite 700 |
| Operator City Name | Houston |
| Operator State Abbreviation | TX |
| Operator Postal Code | 77002 |
| Local Datetime | 2020-11-06 17:30:00 |
| Time Zone | Central |
| Daylight Savings Ind | No |
| Location Latitude | 32.46716 Google Maps OpenStreetMap |
| Location Longitude | -91.59778 Google Maps OpenStreetMap |
| Nrc Rpt Num | 1291840 NRC Report How to search |
| Nrc Rpt Datetime | 2020-11-10 13:50:00 |
| Additional Nrc Report Numbers | 1291982 |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 5000 |
| Intentional Release | 0 |
| 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 |
| Shutdown Datetime | 2020-11-06 17:44:00 |
| Restart Datetime | 2020-11-06 23:00:00 |
| Communication State Fed Ind | Yes |
| Party Initiated Communication | Operator |
| Initial Responder Com Datetime | 2020-11-06 17:30:00 |
| Ignite Ind | No |
| Num Pub Evacuated | 0 |
| Incident Identified Datetime | 2020-11-06 17:30:00 |
| On Site Datetime | 2020-11-06 17:40:00 |
| On Off Shore | Onshore |
| Onshore State Abbreviation | La |
| Onshore Postal Code | 71232 |
| Onshore City Name | Delhi |
| Onshore County Name | Richland |
| Designated Location | Milepost |
| Designated Name | Mp 151.3 |
| Pipe Fac Name | Delhi Compressor Station |
| Segment Name | Anr 501 Mainline |
| 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 | Esd System, But Excluding Product Drain Lines And Tubing |
| Installation Year | 1956 |
| Manufactured Year | Unknown |
| Material Involved | Carbon Steel |
| Release Type | Other |
| Release Type Details | Valve Failure |
| Class Location Type | Class 1 Location |
| Could Be Hca | No |
| Pir Radius | 787 |
| Heat Damage Ind | No |
| Non Heat Damage Ind | No |
| Est Cost Oper Paid | 0 |
| Est Cost Unintentional Release | 13350 |
| Est Cost Intentional Release | 0 |
| Est Cost Prop Damage | 1000 |
| Est Cost Emergency | 0 |
| Est Cost Other | 0 |
| Est Cost Other Details | None |
| Gas Cost In Mcf | 2.67 |
| Prpty | 14350 |
| 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 | 786 |
| Gas Flow In Pipe In Mcf | 2000 |
| Mop Psig | 858 |
| Mop Cfr Section | 192.619(A)(3) View CFR 49 §192 |
| Maop Established Date | 1967-07-26 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 | 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 | The controller identified the issue via scada alarms and initiated a call-out of field operational personnel, who identified the incident and took corrective actions. Gas control does not have the capability to remotely close valves and therefore could prevent the incident through their actions. |
| 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 |
| Block Valve Ind | Yes |
| Esd System Failure Ind | Yes |
| Additional Erosion Wear Ind | Yes |
| Preparer Name | R**** R S***** |
| Preparer Title | Compliance Specialist |
| Preparer Email | R***********@t*******.com |
| Preparer Telephone | 6154655123 |
| Authorizer Name | E*** H***** |
| Authorizer Title | Senior Compliance Manager Usgo And Keystone |
| Authorizer Telephone | 4024927447 |
| Authorizer Email | E**********@t*******.com |
| Narrative | On november 6 at 17:30 ct, anr pipeline's gas control received an emergency shutdown (esd) alarm at delhi compressor station located at 1984 hwy 80 w, delhi, la 71232 (32.46707, -91.59751). When the alarm was detected, a technician was dispatched to the compressor station to investigate. Upon arrival at the site at 17:40 ct, the technician discovered natural gas being released through the station's blowdown stacks. Immediate action was taken by verifying no emergency existed and closing the valves, which ended the release at 17:44 ct. Unintentional gas loss was calculated to 5.0 million cubic feet (mmcf). No property damage or injuries were documented, and no evacuations were required. Following the release, initial site inspections were completed to look for evidence of fire or other damage. No damage was observed, and the station was placed back into partial service at 23:00 ct on november 6. When the system activated, station isolation valve 501-13-25 failed to fully close resulting in the unintentional release of gas. Following the incident, valve 501-13-25 was removed from service for inspection. A poppet block valve, attached to the valve operator was removed, disassembled, and inspected for potential damage. Damaged and worn seals on the poppet valve were identified which prevented the valve from fully closing when actuated. The poppet block valves associated with valve 501-13-25 were cleaned and the seals were replaced. After repairing the valves, an esd system inspection was completed according to procedures on november 17, 2020. The test was initiated by triggering the flame detectors and then monitoring all emergency system valves for operations and timing. During the test, all system valves properly operated and fully closed. |
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