Incident details
Operator, cause, commodity and consequences with raw source fields.
GTG incident on 2020-10-18 — TX
Operator
Transwestern Pipeline Company Llc
Cause
Equipment Failure
Commodity
Natural Gas
Program
GTG
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$0
Incident datetime
2020-10-18 08:11
Report number
Location
TX
Narrative
08:11 mtn, october 18th technician contacted gas control to notify them of gas blowing. At 08:22 mtn isolated relief valve then tested and found that the relief control pilot would not hold a set point. Replaced with spare relief control pilot, retested and set pressure. 08:35 mtn, restarted units and found that everything was back to normal. 06:46 mtn, october 19th rough calculation of gas volume loss was completed, notified regulatory. 07:44 mtn, october 19th nrc notification was made nrc #1290106. 06:08 mtn, october 21st 48 hour nrc notification was made nrc #1290280, updated gas volume.
Detailed record list
Report Received Date
2020-11-17 00:00:00
Iyear
2020
Report Number
20200121
Supplemental Number
34543
Report Type
Original Final
Operator Id
19610
Name
Transwestern Pipeline Company Llc
Operator Street Address
1300 Main Street
Operator City Name
Houston
Operator State Abbreviation
TX
Operator Postal Code
77002
Local Datetime
2020-10-19 06:02:00
Time Zone
Mountain
Daylight Savings Ind
Yes
Location Latitude
32.532378
Location Longitude
-103.809277
Nrc Rpt Num
1290106
Nrc Rpt Datetime
2020-10-19 07:44:00
Additional Nrc Report Numbers
1290280
Commodity Released Type
Natural Gas
Unintentional Release
7894
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
2020-10-18 08:22:00
Restart Datetime
2020-10-18 08:35:00
Communication State Fed Ind
No
Ignite Ind
No
Num Pub Evacuated
0
Incident Identified Datetime
2020-10-18 08:11:00
On Site Datetime
2020-10-18 08:15:00
On Off Shore
Onshore
Onshore State Abbreviation
Nm
Onshore Postal Code
88220
Onshore City Name
Carlsbad
Onshore County Name
Lea
Designated Location
Milepost
Designated Name
79.4
Pipe Fac Name
Wt-1 Carlsbad Compressor Station
Segment Name
Nmbw119
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
1960
Manufactured Year
1959
Material Involved
Carbon Steel
Release Type
Other
Release Type Details
Relief Valve Operation - Malfunction Of Relief Valve Due To Control Pilot.
Class Location Type
Class 1 Location
Could Be Hca
No
Pir Radius
526
Heat Damage Ind
No
Non Heat Damage Ind
No
Est Cost Oper Paid
0
Est Cost Unintentional Release
4736
Est Cost Intentional Release
0
Est Cost Prop Damage
0
Est Cost Emergency
500
Est Cost Other
0
Gas Cost In Mcf
0.6
Prpty
5236
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
988
Gas Flow In Pipe In Mcf
423
Mop Psig
1008
Mop Cfr Section
192.619(C)
Maop Established Date
1960-01-01 00:00:00
Maop Reversal Flow Ind
Bi-Directional
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
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
A relief valve failure was the cause of the gas release.
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
Other Control Relief Ind
Yes
Other Control Relief Details
Shorter Than Normal Life Of The Parts In The Pilot That Controls The Relief Valve.
Eq Additional Other Ind
Yes
Eq Additional Other Details
Relief Valve Pilot Failure.
Preparer Name
K****** H*******
Preparer Email
K***************@e*************.com
Preparer Telephone
713-989-7085
Authorizer Name
T*** N*******
Authorizer Telephone
713-989-7126
Authorizer Email
T************@e*************.com
Narrative
08:11 mtn, october 18th technician contacted gas control to notify them of gas blowing. At 08:22 mtn isolated relief valve then tested and found that the relief control pilot would not hold a set point. Replaced with spare relief control pilot, retested and set pressure. 08:35 mtn, restarted units and found that everything was back to normal. 06:46 mtn, october 19th rough calculation of gas volume loss was completed, notified regulatory. 07:44 mtn, october 19th nrc notification was made nrc #1290106. 06:08 mtn, october 21st 48 hour nrc notification was made nrc #1290280, updated gas volume.
| Report Received Date | 2020-11-17 00:00:00 |
|---|---|
| Iyear | 2020 |
| Report Number | 20200121 |
| Supplemental Number | 34543 |
| Report Type | Original Final |
| Operator Id | 19610 PHMSA Enforcement |
| Name | Transwestern Pipeline Company Llc |
| Operator Street Address | 1300 Main Street |
| Operator City Name | Houston |
| Operator State Abbreviation | TX |
| Operator Postal Code | 77002 |
| Local Datetime | 2020-10-19 06:02:00 |
| Time Zone | Mountain |
| Daylight Savings Ind | Yes |
| Location Latitude | 32.532378 Google Maps OpenStreetMap |
| Location Longitude | -103.809277 Google Maps OpenStreetMap |
| Nrc Rpt Num | 1290106 NRC Report How to search |
| Nrc Rpt Datetime | 2020-10-19 07:44:00 |
| Additional Nrc Report Numbers | 1290280 |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 7894 |
| 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 | 2020-10-18 08:22:00 |
| Restart Datetime | 2020-10-18 08:35:00 |
| Communication State Fed Ind | No |
| Ignite Ind | No |
| Num Pub Evacuated | 0 |
| Incident Identified Datetime | 2020-10-18 08:11:00 |
| On Site Datetime | 2020-10-18 08:15:00 |
| On Off Shore | Onshore |
| Onshore State Abbreviation | Nm |
| Onshore Postal Code | 88220 |
| Onshore City Name | Carlsbad |
| Onshore County Name | Lea |
| Designated Location | Milepost |
| Designated Name | 79.4 |
| Pipe Fac Name | Wt-1 Carlsbad Compressor Station |
| Segment Name | Nmbw119 |
| 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 | 1960 |
| Manufactured Year | 1959 |
| Material Involved | Carbon Steel |
| Release Type | Other |
| Release Type Details | Relief Valve Operation - Malfunction Of Relief Valve Due To Control Pilot. |
| Class Location Type | Class 1 Location |
| Could Be Hca | No |
| Pir Radius | 526 |
| Heat Damage Ind | No |
| Non Heat Damage Ind | No |
| Est Cost Oper Paid | 0 |
| Est Cost Unintentional Release | 4736 |
| Est Cost Intentional Release | 0 |
| Est Cost Prop Damage | 0 |
| Est Cost Emergency | 500 |
| Est Cost Other | 0 |
| Gas Cost In Mcf | 0.6 |
| Prpty | 5236 |
| 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 | 988 |
| Gas Flow In Pipe In Mcf | 423 |
| Mop Psig | 1008 |
| Mop Cfr Section | 192.619(C) View CFR 49 §192 |
| Maop Established Date | 1960-01-01 00:00:00 |
| Maop Reversal Flow Ind | Bi-Directional |
| 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 | 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 | A relief valve failure was the cause of the gas release. |
| 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 |
| Other Control Relief Ind | Yes |
| Other Control Relief Details | Shorter Than Normal Life Of The Parts In The Pilot That Controls The Relief Valve. |
| Eq Additional Other Ind | Yes |
| Eq Additional Other Details | Relief Valve Pilot Failure. |
| Preparer Name | K****** H******* |
| Preparer Email | K***************@e*************.com |
| Preparer Telephone | 713-989-7085 |
| Authorizer Name | T*** N******* |
| Authorizer Telephone | 713-989-7126 |
| Authorizer Email | T************@e*************.com |
| Narrative | 08:11 mtn, october 18th technician contacted gas control to notify them of gas blowing. At 08:22 mtn isolated relief valve then tested and found that the relief control pilot would not hold a set point. Replaced with spare relief control pilot, retested and set pressure. 08:35 mtn, restarted units and found that everything was back to normal. 06:46 mtn, october 19th rough calculation of gas volume loss was completed, notified regulatory. 07:44 mtn, october 19th nrc notification was made nrc #1290106. 06:08 mtn, october 21st 48 hour nrc notification was made nrc #1290280, updated gas volume. |
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