Incident details
Operator, cause, commodity and consequences with raw source fields.
GTG incident on 2024-06-27 — TX
Operator
Southern Natural Gas Co
Cause
Equipment Failure
Commodity
Natural Gas
Program
GTG
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$5,000
Incident datetime
2024-06-27 00:00 UTC
Report number
Location
TX
Narrative
A planned esd was conducted to depressurize the station for maintenance and valve repairs. During the esd, the discharge side gate valves operated as intended, but suction side gate valve #43 did not fully close, only partially closing. While attempting to close the valve, the gas loss exceeded the allowable non-reporting limit of 3,000 mcf, ultimately reaching 28,956 mcf once the esd and blow-off valves were closed. An investigation will be conducted to determine why valve #43 did not function properly.
Detailed record list
Report Received Date
2024-06-27 00:00:00
Iyear
2024
Report Number
20240084
Supplemental Number
40209
Report Type
Supplemental Final
Operator Id
18516
Name
Southern Natural Gas Co
Operator Street Address
1001 Louisiana St, Ste 1000 Suite 1000
Operator City Name
Houston
Operator State Abbreviation
TX
Operator Postal Code
77002
Time Zone
Eastern
Daylight Savings Ind
No
Location Latitude
32.7888724
Location Longitude
-84.2534684
Nrc Rpt Num
1400268
Additional Nrc Report Numbers
1400434
Commodity Released Type
Natural Gas
Unintentional Release
28956
Intentional Release
969
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
No
Shutdown Explain
Planned Esd To Depressurized The Station For Maint.and Valve Did Not Close
Communication State Fed Ind
No
Ignite Ind
No
Num Pub Evacuated
0
On Off Shore
Onshore
Onshore State Abbreviation
Ga
Onshore Postal Code
30286
Onshore City Name
Thomaston
Onshore County Name
Upson
Designated Location
Milepost
Designated Name
347.0
Pipe Fac Name
Sng Thomaston C/s
Segment Name
Thomaston C/s
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
Unknown
Manufactured Year
Unknown
Material Involved
Carbon Steel
Release Type
Leak
Leak Type
Other
Leak Type Other
Valve Did Not Close
Class Location Type
Class 1 Location
Could Be Hca
No
Not Flammable Ind
Not Flammable
Heat Damage Ind
No
Non Heat Damage Ind
No
Did Occur In Mca Ind
No
Est Cost Oper Paid
0
Est Cost Unintentional Release
66599
Est Cost Intentional Release
2229
Est Cost Prop Damage
5000
Est Cost Emergency
0
Est Cost Other
0
Gas Cost In Mcf
2.3
Prpty
73828
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
1069
Gas Flow In Pipe In Mcf
1375000
Mop Psig
1200
Mop Cfr Section
192.619(A)(2)
Maop Established Date
1970-07-01 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
Other
Accident Details
Planned Esd To Depressurized The Station For Maint.and Valve Did Not Close
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
Esd System Failure Ind
Yes
Eq Additional Other Ind
Yes
Eq Additional Other Details
The Seals Failed In The Shafer Operator That Controls The Valve
Preparer Name
K**** S***
Preparer Title
Manager Engineer-Code And Standard
Preparer Email
K*********@k***********.com
Preparer Telephone
713-480-2587
Authorizer Name
Z*** R*****
Authorizer Title
Director Engineer-Code And Standard
Authorizer Telephone
713-420-2609
Authorizer Email
Z**********@k***********.com
Narrative
A planned esd was conducted to depressurize the station for maintenance and valve repairs. During the esd, the discharge side gate valves operated as intended, but suction side gate valve #43 did not fully close, only partially closing. While attempting to close the valve, the gas loss exceeded the allowable non-reporting limit of 3,000 mcf, ultimately reaching 28,956 mcf once the esd and blow-off valves were closed. An investigation will be conducted to determine why valve #43 did not function properly.
| Report Received Date | 2024-06-27 00:00:00 |
|---|---|
| Iyear | 2024 |
| Report Number | 20240084 |
| Supplemental Number | 40209 |
| Report Type | Supplemental Final |
| Operator Id | 18516 PHMSA Enforcement |
| Name | Southern Natural Gas Co |
| Operator Street Address | 1001 Louisiana St, Ste 1000 Suite 1000 |
| Operator City Name | Houston |
| Operator State Abbreviation | TX |
| Operator Postal Code | 77002 |
| Time Zone | Eastern |
| Daylight Savings Ind | No |
| Location Latitude | 32.7888724 Google Maps OpenStreetMap |
| Location Longitude | -84.2534684 Google Maps OpenStreetMap |
| Nrc Rpt Num | 1400268 NRC Report How to search |
| Additional Nrc Report Numbers | 1400434 |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 28956 |
| Intentional Release | 969 |
| 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 | No |
| Shutdown Explain | Planned Esd To Depressurized The Station For Maint.and Valve Did Not Close |
| Communication State Fed Ind | No |
| Ignite Ind | No |
| Num Pub Evacuated | 0 |
| On Off Shore | Onshore |
| Onshore State Abbreviation | Ga |
| Onshore Postal Code | 30286 |
| Onshore City Name | Thomaston |
| Onshore County Name | Upson |
| Designated Location | Milepost |
| Designated Name | 347.0 |
| Pipe Fac Name | Sng Thomaston C/s |
| Segment Name | Thomaston C/s |
| 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 | Unknown |
| Manufactured Year | Unknown |
| Material Involved | Carbon Steel |
| Release Type | Leak |
| Leak Type | Other |
| Leak Type Other | Valve Did Not Close |
| Class Location Type | Class 1 Location |
| Could Be Hca | No |
| Not Flammable Ind | Not Flammable |
| Heat Damage Ind | No |
| Non Heat Damage Ind | No |
| Did Occur In Mca Ind | No |
| Est Cost Oper Paid | 0 |
| Est Cost Unintentional Release | 66599 |
| Est Cost Intentional Release | 2229 |
| Est Cost Prop Damage | 5000 |
| Est Cost Emergency | 0 |
| Est Cost Other | 0 |
| Gas Cost In Mcf | 2.3 |
| Prpty | 73828 |
| 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 | 1069 |
| Gas Flow In Pipe In Mcf | 1375000 |
| Mop Psig | 1200 |
| Mop Cfr Section | 192.619(A)(2) View CFR 49 §192 |
| Maop Established Date | 1970-07-01 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 | Other |
| Accident Details | Planned Esd To Depressurized The Station For Maint.and Valve Did Not Close |
| 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 |
| Esd System Failure Ind | Yes |
| Eq Additional Other Ind | Yes |
| Eq Additional Other Details | The Seals Failed In The Shafer Operator That Controls The Valve |
| Preparer Name | K**** S*** |
| Preparer Title | Manager Engineer-Code And Standard |
| Preparer Email | K*********@k***********.com |
| Preparer Telephone | 713-480-2587 |
| Authorizer Name | Z*** R***** |
| Authorizer Title | Director Engineer-Code And Standard |
| Authorizer Telephone | 713-420-2609 |
| Authorizer Email | Z**********@k***********.com |
| Narrative | A planned esd was conducted to depressurize the station for maintenance and valve repairs. During the esd, the discharge side gate valves operated as intended, but suction side gate valve #43 did not fully close, only partially closing. While attempting to close the valve, the gas loss exceeded the allowable non-reporting limit of 3,000 mcf, ultimately reaching 28,956 mcf once the esd and blow-off valves were closed. An investigation will be conducted to determine why valve #43 did not function properly. |
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