Incident details
Operator, cause, commodity and consequences with raw source fields.
GTG incident on 2017-11-09 — TX
Operator
Southern Natural Gas Co
Cause
Equipment Failure
Commodity
Natural Gas
Program
GTG
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$400
Incident datetime
2017-11-09 17:04
Report number
Location
TX
Narrative
At 5:04pm engine #10 relief valve began venting gas due to a broken sensing line. The unit was emergency stopped at 5:23pm. The total amount of unintentionally natural gas released was 11,600 mcf. The initial investigation showed that the 1/4-inch pipe nipple on the relief valve pilot test port broke causing the relief valve to vent. Upon further investigation it was determined that vibration and the weight of the test assembly may have contributed to the failure of the pipe nipple. The nipple was replaced with a male x female thread valve and the engine was returned to service. The pir is based on the largest diameter pipe inside the compressor building, not the nipple that failed.
Detailed record list
Report Received Date
2017-12-08 00:00:00
Iyear
2017
Report Number
20170119
Supplemental Number
17602
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
Local Datetime
2017-11-09 17:04:00
Location Latitude
30.19635232
Location Longitude
-91.10086062
Nrc Rpt Num
1196419
Nrc Rpt Datetime
2017-11-09 17:56:00
Commodity Released Type
Natural Gas
Unintentional Release
11600
Intentional Release
0
Accompanying Liquid
0
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Shutdown Due Accident Ind
Yes
Shutdown Datetime
2017-11-09 17:23:00
Restart Datetime
2017-11-10 09:45:00
Ignite Ind
No
Explode Ind
No
Num Pub Evacuated
0
Incident Identified Datetime
2017-11-09 17:04:00
On Site Datetime
2017-11-09 17:23:00
On Off Shore
Onshore
Onshore State Abbreviation
La
Onshore Postal Code
70788
Onshore City Name
White Castle
Onshore County Name
Iberville
Designated Location
Milepost
Designated Name
30.725
Pipe Fac Name
White Castle Compressor Station
Segment Name
Engine #10
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
1957
Material Involved
Carbon Steel
Release Type
Leak
Leak Type
Connection Failure
Class Location Type
Class 1 Location
Could Be Hca
No
Pir Radius
717
Heat Damage Ind
No
Non Heat Damage Ind
No
Hca Fatalities Ind
No
Est Cost Oper Paid
0
Est Cost Unintentional Release
38253
Est Cost Intentional Release
0
Est Cost Prop Damage
400
Est Cost Emergency
0
Est Cost Other
0
Prpty
38653
Accident Psig
1101
Mop Psig
1200
Mop Cfr Section
192.619(C)
Accident Pressure
Pressure Did Not Exceed Maop
Pressure Restriction 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
No control room issues. Incident was due to a broken nipple.
Employee Drug Test Ind
No
Contractor Drug Test Ind
No
Cause
Equipment Failure
Cause Details
Threaded Connection/coupling Failure
Eq Failure Type
Threaded Connection/coupling Failure
Other Stripped Ind
Pipe Nipple
Additional Vibration Ind
Yes
Preparer Name
K****** V** D** L***
Preparer Title
Manager-Engineering Compliance-Codes And Stnds
Preparer Email
K*****************@k***********.com
Preparer Telephone
303-914-7753
Authorizer Name
J**** H********
Authorizer Title
Director-Engineering Compliance Codes And Stnds
Authorizer Telephone
713-369-9443
Authorizer Email
J**************@k***********.com
Narrative
At 5:04pm engine #10 relief valve began venting gas due to a broken sensing line. The unit was emergency stopped at 5:23pm. The total amount of unintentionally natural gas released was 11,600 mcf. The initial investigation showed that the 1/4-inch pipe nipple on the relief valve pilot test port broke causing the relief valve to vent. Upon further investigation it was determined that vibration and the weight of the test assembly may have contributed to the failure of the pipe nipple. The nipple was replaced with a male x female thread valve and the engine was returned to service. The pir is based on the largest diameter pipe inside the compressor building, not the nipple that failed.
| Report Received Date | 2017-12-08 00:00:00 |
|---|---|
| Iyear | 2017 |
| Report Number | 20170119 |
| Supplemental Number | 17602 |
| 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 |
| Local Datetime | 2017-11-09 17:04:00 |
| Location Latitude | 30.19635232 Google Maps OpenStreetMap |
| Location Longitude | -91.10086062 Google Maps OpenStreetMap |
| Nrc Rpt Num | 1196419 NRC Report How to search |
| Nrc Rpt Datetime | 2017-11-09 17:56:00 |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 11600 |
| Intentional Release | 0 |
| Accompanying Liquid | 0 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Shutdown Due Accident Ind | Yes |
| Shutdown Datetime | 2017-11-09 17:23:00 |
| Restart Datetime | 2017-11-10 09:45:00 |
| Ignite Ind | No |
| Explode Ind | No |
| Num Pub Evacuated | 0 |
| Incident Identified Datetime | 2017-11-09 17:04:00 |
| On Site Datetime | 2017-11-09 17:23:00 |
| On Off Shore | Onshore |
| Onshore State Abbreviation | La |
| Onshore Postal Code | 70788 |
| Onshore City Name | White Castle |
| Onshore County Name | Iberville |
| Designated Location | Milepost |
| Designated Name | 30.725 |
| Pipe Fac Name | White Castle Compressor Station |
| Segment Name | Engine #10 |
| 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 | 1957 |
| Material Involved | Carbon Steel |
| Release Type | Leak |
| Leak Type | Connection Failure |
| Class Location Type | Class 1 Location |
| Could Be Hca | No |
| Pir Radius | 717 |
| Heat Damage Ind | No |
| Non Heat Damage Ind | No |
| Hca Fatalities Ind | No |
| Est Cost Oper Paid | 0 |
| Est Cost Unintentional Release | 38253 |
| Est Cost Intentional Release | 0 |
| Est Cost Prop Damage | 400 |
| Est Cost Emergency | 0 |
| Est Cost Other | 0 |
| Prpty | 38653 |
| Accident Psig | 1101 |
| Mop Psig | 1200 |
| Mop Cfr Section | 192.619(C) View CFR 49 §192 |
| Accident Pressure | Pressure Did Not Exceed Maop |
| Pressure Restriction 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 | No control room issues. Incident was due to a broken nipple. |
| Employee Drug Test Ind | No |
| Contractor Drug Test Ind | No |
| Cause | Equipment Failure |
| Cause Details | Threaded Connection/coupling Failure |
| Eq Failure Type | Threaded Connection/coupling Failure |
| Other Stripped Ind | Pipe Nipple |
| Additional Vibration Ind | Yes |
| Preparer Name | K****** V** D** L*** |
| Preparer Title | Manager-Engineering Compliance-Codes And Stnds |
| Preparer Email | K*****************@k***********.com |
| Preparer Telephone | 303-914-7753 |
| Authorizer Name | J**** H******** |
| Authorizer Title | Director-Engineering Compliance Codes And Stnds |
| Authorizer Telephone | 713-369-9443 |
| Authorizer Email | J**************@k***********.com |
| Narrative | At 5:04pm engine #10 relief valve began venting gas due to a broken sensing line. The unit was emergency stopped at 5:23pm. The total amount of unintentionally natural gas released was 11,600 mcf. The initial investigation showed that the 1/4-inch pipe nipple on the relief valve pilot test port broke causing the relief valve to vent. Upon further investigation it was determined that vibration and the weight of the test assembly may have contributed to the failure of the pipe nipple. The nipple was replaced with a male x female thread valve and the engine was returned to service. The pir is based on the largest diameter pipe inside the compressor building, not the nipple that failed. |
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