Incident details
Operator, cause, commodity and consequences with raw source fields.
GTG incident on 2025-02-07 — TX
Operator
Southern Natural Gas Co
Cause
Natural Force Damage
Commodity
Natural Gas
Program
GTG
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$0
Incident datetime
2025-02-07 00:00 UTC
Report number
Location
TX
Narrative
A fitting leak occurred on the supply line at the blow-off operator causing the station esd blowdown valve to open resulting in a release of 15354 mcf of natural gas. There were no injuries, fire, or evacuations associated with this release.
Detailed record list
Report Received Date
2025-02-07 00:00:00
Iyear
2025
Report Number
20250011
Supplemental Number
40805
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
Central
Daylight Savings Ind
No
Location Latitude
32.15
Location Longitude
-88.8425
Nrc Rpt Num
1420732
Additional Nrc Report Numbers
1420855
Commodity Released Type
Natural Gas
Unintentional Release
15354
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
Communication State Fed Ind
No
Ignite Ind
No
Num Pub Evacuated
0
On Off Shore
Onshore
Onshore State Abbreviation
Ms
Onshore Postal Code
39330
Onshore City Name
Enterprise
Onshore County Name
Clarke
Designated Location
Not Applicable
Pipe Fac Name
Enterprise Compressor Station
Segment Name
Enterprise Compressor Station
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
Tubing
Tubing Material
Stainless Steel
Tubing Type
Rigid
Installation Year
Unknown
Manufactured Year
Unknown
Material Involved
Material Other Than Carbon Steel Or Plastic
Material Details
Stainless Steel
Release Type
Leak
Leak Type
Connection Failure
Class Location Type
Class 1 Location
Could Be Hca
No
Pir Radius
164
Heat Damage Ind
No
Non Heat Damage Ind
No
Did Occur In Mca Ind
No
Est Cost Oper Paid
0
Est Cost Unintentional Release
4523
Est Cost Intentional Release
0
Est Cost Prop Damage
0
Est Cost Emergency
0
Est Cost Other
0
Gas Cost In Mcf
0.2946
Prpty
4523
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
1095
Gas Flow In Pipe In Mcf
1
Mop Psig
1200
Mop Cfr Section
192.619(A)(1)
Maop Established Date
1950-01-01 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
No
Scada Conf Ind
No
Accident Identifier
Local Operating Personnel, Including Contractors
Operator Type
Operator Employee
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 esd value failed because of a 1/2" ss supply line fitting leaking - further investigation found the following: ' water collected in the connection and froze during freezing weather. When the ice melted, it caused the fitting to loosen enough to start leaking. ' there was no damage to the fitting but we changed it as a precaution. ' the fitting was a stainless tubing screw compression fitting
Employee Drug Test Ind
No
Contractor Drug Test Ind
No
Cause
Natural Force Damage
Cause Details
Temperature
Natural Force Type
Temperature
Temperature Subtype
Frozen Components
Nf Extreme Weather Ind
No
Preparer Name
R*** L***
Preparer Title
Codes And Standards Engineer
Preparer Email
R********@k***********.com
Preparer Telephone
3462425231
Authorizer Name
Z*** R*****
Authorizer Telephone
8329190774
Authorizer Email
Z**********@k***********.com
Narrative
A fitting leak occurred on the supply line at the blow-off operator causing the station esd blowdown valve to open resulting in a release of 15354 mcf of natural gas. There were no injuries, fire, or evacuations associated with this release.
| Report Received Date | 2025-02-07 00:00:00 |
|---|---|
| Iyear | 2025 |
| Report Number | 20250011 |
| Supplemental Number | 40805 |
| 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 | Central |
| Daylight Savings Ind | No |
| Location Latitude | 32.15 Google Maps OpenStreetMap |
| Location Longitude | -88.8425 Google Maps OpenStreetMap |
| Nrc Rpt Num | 1420732 NRC Report How to search |
| Additional Nrc Report Numbers | 1420855 |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 15354 |
| 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 |
| Communication State Fed Ind | No |
| Ignite Ind | No |
| Num Pub Evacuated | 0 |
| On Off Shore | Onshore |
| Onshore State Abbreviation | Ms |
| Onshore Postal Code | 39330 |
| Onshore City Name | Enterprise |
| Onshore County Name | Clarke |
| Designated Location | Not Applicable |
| Pipe Fac Name | Enterprise Compressor Station |
| Segment Name | Enterprise Compressor Station |
| 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 | Tubing |
| Tubing Material | Stainless Steel |
| Tubing Type | Rigid |
| Installation Year | Unknown |
| Manufactured Year | Unknown |
| Material Involved | Material Other Than Carbon Steel Or Plastic |
| Material Details | Stainless Steel |
| Release Type | Leak |
| Leak Type | Connection Failure |
| Class Location Type | Class 1 Location |
| Could Be Hca | No |
| Pir Radius | 164 |
| Heat Damage Ind | No |
| Non Heat Damage Ind | No |
| Did Occur In Mca Ind | No |
| Est Cost Oper Paid | 0 |
| Est Cost Unintentional Release | 4523 |
| Est Cost Intentional Release | 0 |
| Est Cost Prop Damage | 0 |
| Est Cost Emergency | 0 |
| Est Cost Other | 0 |
| Gas Cost In Mcf | 0.2946 |
| Prpty | 4523 |
| 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 | 1095 |
| Gas Flow In Pipe In Mcf | 1 |
| Mop Psig | 1200 |
| Mop Cfr Section | 192.619(A)(1) View CFR 49 §192 |
| Maop Established Date | 1950-01-01 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 | No |
| Scada Conf Ind | No |
| Accident Identifier | Local Operating Personnel, Including Contractors |
| Operator Type | Operator Employee |
| 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 esd value failed because of a 1/2" ss supply line fitting leaking - further investigation found the following: ' water collected in the connection and froze during freezing weather. When the ice melted, it caused the fitting to loosen enough to start leaking. ' there was no damage to the fitting but we changed it as a precaution. ' the fitting was a stainless tubing screw compression fitting |
| Employee Drug Test Ind | No |
| Contractor Drug Test Ind | No |
| Cause | Natural Force Damage |
| Cause Details | Temperature |
| Natural Force Type | Temperature |
| Temperature Subtype | Frozen Components |
| Nf Extreme Weather Ind | No |
| Preparer Name | R*** L*** |
| Preparer Title | Codes And Standards Engineer |
| Preparer Email | R********@k***********.com |
| Preparer Telephone | 3462425231 |
| Authorizer Name | Z*** R***** |
| Authorizer Telephone | 8329190774 |
| Authorizer Email | Z**********@k***********.com |
| Narrative | A fitting leak occurred on the supply line at the blow-off operator causing the station esd blowdown valve to open resulting in a release of 15354 mcf of natural gas. There were no injuries, fire, or evacuations associated with this release. |
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