Incident details
Operator, cause, commodity and consequences with raw source fields.
GTG incident on 2018-09-06 — TX
Operator
Tennessee Gas Pipeline Company
Cause
Equipment Failure
Commodity
Natural Gas
Program
GTG
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$17,000
Incident datetime
2018-09-06 14:56
Report number
Location
TX
Narrative
Approximately 14:55 (eastern), operations staff were working in a esd relay panel. An inadvertent esd signal was sent to building "c" resulting in closure of two valves. Compressor units in building "b" and "d" were on line. Overpressuring began to occur in a discharge header; relief valve 106-bd5 lifted then reseated. Relief valve 106-bd3 also lifted and reseated. However relief valve 106-bd3 lifted again but did not reseat due to damage caused by the passing of high pressure gas. Station employees observed the event and isolated the gas flow as quickly as possible. The following investigation found a loose wire, a diode jumper, had become dislodged from the relay in the panel causing the inadvertent esd signal. Relief valve 106-bd3 was repaired as well as the loose wire. Appropriate checks and inspections were made and compressor station returned to service. The work at the relay panel involved building "a". With post-event investigation and follow-up, the respective wiring has been revised to separate building "a" from impacting other buildings. Also, post-event investigation found final gas lost volume less than originally calculated and reported to nrc.
Detailed record list
Report Received Date
2018-10-04 00:00:00
Iyear
2018
Report Number
20180098
Supplemental Number
31101
Report Type
Supplemental Final
Operator Id
19160
Name
Tennessee Gas Pipeline Company
Operator Street Address
1001 Louisiana St
Operator City Name
Houston
Operator State Abbreviation
TX
Operator Postal Code
77002
Local Datetime
2018-09-06 15:03:00
Location Latitude
37.91750816
Location Longitude
-83.9848629
Nrc Rpt Num
1223832
Nrc Rpt Datetime
2018-09-06 15:43:00
Commodity Released Type
Natural Gas
Unintentional Release
7533
Intentional Release
0
Accompanying Liquid
0
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Shutdown Due Accident Ind
Yes
Shutdown Datetime
2018-09-06 15:05:00
Restart Datetime
2018-09-06 23:00:00
Ignite Ind
No
Explode Ind
No
Num Pub Evacuated
0
Incident Identified Datetime
2018-09-06 14:56:00
On Site Datetime
2018-09-06 14:56:00
On Off Shore
Onshore
Onshore State Abbreviation
Ky
Onshore Postal Code
40312
Onshore City Name
Not Within A Municipality
Onshore County Name
Powell
Designated Location
Milepost
Designated Name
12+76
Pipe Fac Name
Compressor Station 106, Clay City Station
Segment Name
Line 100-3
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
Valve
Valve Type
Relief Valve
Installation Year
2005
Material Involved
Carbon Steel
Release Type
Leak
Leak Type
Other
Leak Type Other
Relief Valve Did Not Reseat
Class Location Type
Class 2 Location
Could Be Hca
No
Pir Radius
454
Heat Damage Ind
No
Non Heat Damage Ind
No
Hca Fatalities Ind
No
Est Cost Oper Paid
0
Est Cost Unintentional Release
21545
Est Cost Intentional Release
0
Est Cost Prop Damage
17000
Est Cost Emergency
700
Est Cost Other
2000
Est Cost Other Details
Investigation Cost
Prpty
41245
Accident Psig
808
Mop Psig
750
Mop Cfr Section
192.619(C)
Accident Pressure
Pressure Exceeded Maop, But Did Not Exceed The Applicable Allowance In 192.201
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
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
Loose wire in panel caused inadvertent signal to esd of building c closing two valves causing rv bd3 to lift twice; second time valve did not seat; on site employees heard release;
Employee Drug Test Ind
Yes
Contractor Drug Test Ind
No
Num Employees Tested
2
Num Employees Failed
0
Cause
Equipment Failure
Cause Details
Malfunction Of Control/relief Equipment
Eq Failure Type
Malfunction Of Control/relief Equipment
Relief Valve Ind
Yes
Additional Overpressure Ind
Yes
Eq Additional Other Ind
Yes
Eq Additional Other Details
Relief Valve Seat Damaged During Activation
Preparer Name
W****** M***** M*****
Preparer Title
Specialist-Pipeline Technical
Preparer Email
M************@k***********.com
Preparer Telephone
205 325 3863
Preparer Fax
205 325 3504
Authorizer Name
J**** H********
Authorizer Title
Director Compliance Codes And Standards
Authorizer Telephone
713 369 9443
Authorizer Email
J**************@k***********.com
Narrative
Approximately 14:55 (eastern), operations staff were working in a esd relay panel. An inadvertent esd signal was sent to building "c" resulting in closure of two valves. Compressor units in building "b" and "d" were on line. Overpressuring began to occur in a discharge header; relief valve 106-bd5 lifted then reseated. Relief valve 106-bd3 also lifted and reseated. However relief valve 106-bd3 lifted again but did not reseat due to damage caused by the passing of high pressure gas. Station employees observed the event and isolated the gas flow as quickly as possible. The following investigation found a loose wire, a diode jumper, had become dislodged from the relay in the panel causing the inadvertent esd signal. Relief valve 106-bd3 was repaired as well as the loose wire. Appropriate checks and inspections were made and compressor station returned to service. The work at the relay panel involved building "a". With post-event investigation and follow-up, the respective wiring has been revised to separate building "a" from impacting other buildings. Also, post-event investigation found final gas lost volume less than originally calculated and reported to nrc.
| Report Received Date | 2018-10-04 00:00:00 |
|---|---|
| Iyear | 2018 |
| Report Number | 20180098 |
| Supplemental Number | 31101 |
| Report Type | Supplemental Final |
| Operator Id | 19160 PHMSA Enforcement |
| Name | Tennessee Gas Pipeline Company |
| Operator Street Address | 1001 Louisiana St |
| Operator City Name | Houston |
| Operator State Abbreviation | TX |
| Operator Postal Code | 77002 |
| Local Datetime | 2018-09-06 15:03:00 |
| Location Latitude | 37.91750816 Google Maps OpenStreetMap |
| Location Longitude | -83.9848629 Google Maps OpenStreetMap |
| Nrc Rpt Num | 1223832 NRC Report How to search |
| Nrc Rpt Datetime | 2018-09-06 15:43:00 |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 7533 |
| Intentional Release | 0 |
| Accompanying Liquid | 0 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Shutdown Due Accident Ind | Yes |
| Shutdown Datetime | 2018-09-06 15:05:00 |
| Restart Datetime | 2018-09-06 23:00:00 |
| Ignite Ind | No |
| Explode Ind | No |
| Num Pub Evacuated | 0 |
| Incident Identified Datetime | 2018-09-06 14:56:00 |
| On Site Datetime | 2018-09-06 14:56:00 |
| On Off Shore | Onshore |
| Onshore State Abbreviation | Ky |
| Onshore Postal Code | 40312 |
| Onshore City Name | Not Within A Municipality |
| Onshore County Name | Powell |
| Designated Location | Milepost |
| Designated Name | 12+76 |
| Pipe Fac Name | Compressor Station 106, Clay City Station |
| Segment Name | Line 100-3 |
| 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 | Valve |
| Valve Type | Relief Valve |
| Installation Year | 2005 |
| Material Involved | Carbon Steel |
| Release Type | Leak |
| Leak Type | Other |
| Leak Type Other | Relief Valve Did Not Reseat |
| Class Location Type | Class 2 Location |
| Could Be Hca | No |
| Pir Radius | 454 |
| Heat Damage Ind | No |
| Non Heat Damage Ind | No |
| Hca Fatalities Ind | No |
| Est Cost Oper Paid | 0 |
| Est Cost Unintentional Release | 21545 |
| Est Cost Intentional Release | 0 |
| Est Cost Prop Damage | 17000 |
| Est Cost Emergency | 700 |
| Est Cost Other | 2000 |
| Est Cost Other Details | Investigation Cost |
| Prpty | 41245 |
| Accident Psig | 808 |
| Mop Psig | 750 |
| Mop Cfr Section | 192.619(C) View CFR 49 §192 |
| Accident Pressure | Pressure Exceeded Maop, But Did Not Exceed The Applicable Allowance In 192.201 |
| 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 | 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 | Loose wire in panel caused inadvertent signal to esd of building c closing two valves causing rv bd3 to lift twice; second time valve did not seat; on site employees heard release; |
| Employee Drug Test Ind | Yes |
| Contractor Drug Test Ind | No |
| Num Employees Tested | 2 |
| Num Employees Failed | 0 |
| Cause | Equipment Failure |
| Cause Details | Malfunction Of Control/relief Equipment |
| Eq Failure Type | Malfunction Of Control/relief Equipment |
| Relief Valve Ind | Yes |
| Additional Overpressure Ind | Yes |
| Eq Additional Other Ind | Yes |
| Eq Additional Other Details | Relief Valve Seat Damaged During Activation |
| Preparer Name | W****** M***** M***** |
| Preparer Title | Specialist-Pipeline Technical |
| Preparer Email | M************@k***********.com |
| Preparer Telephone | 205 325 3863 |
| Preparer Fax | 205 325 3504 |
| Authorizer Name | J**** H******** |
| Authorizer Title | Director Compliance Codes And Standards |
| Authorizer Telephone | 713 369 9443 |
| Authorizer Email | J**************@k***********.com |
| Narrative | Approximately 14:55 (eastern), operations staff were working in a esd relay panel. An inadvertent esd signal was sent to building "c" resulting in closure of two valves. Compressor units in building "b" and "d" were on line. Overpressuring began to occur in a discharge header; relief valve 106-bd5 lifted then reseated. Relief valve 106-bd3 also lifted and reseated. However relief valve 106-bd3 lifted again but did not reseat due to damage caused by the passing of high pressure gas. Station employees observed the event and isolated the gas flow as quickly as possible. The following investigation found a loose wire, a diode jumper, had become dislodged from the relay in the panel causing the inadvertent esd signal. Relief valve 106-bd3 was repaired as well as the loose wire. Appropriate checks and inspections were made and compressor station returned to service. The work at the relay panel involved building "a". With post-event investigation and follow-up, the respective wiring has been revised to separate building "a" from impacting other buildings. Also, post-event investigation found final gas lost volume less than originally calculated and reported to nrc. |
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