Incident details
Operator, cause, commodity and consequences with raw source fields.
HL incident on 2019-09-30 — TX
Operator
Targa Downstream Llc
Cause
Equipment Failure
Commodity
Hvl Or Other Flammable Or Toxic Fluid Which Is A Gas At Ambient Conditions
Program
HL
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$420
Incident datetime
2019-09-30 09:00
Report number
Location
TX
Narrative
On september 30th, 2019 a valve station lost electric power on targa's grand prix pipeline resulting in mainline valve closure at the station. The valve closure caused pressure to rise at the upstream valve stations on the pipeline. The rise in pressure caused a thermal relief valve to open and send ngl vapors to the station vent stack. Maximum pressure at the station was 1,426 psi. The relief valve set pressure was 1,440 psi. And the relief valve was tested in place on august 9, 2019 and opened 1,440 psi. Targa personnel were at the site at the time of the release and determined the release time to be 15 seconds. For that amount of time, the volume of ngl product released was 72 gallons. The other relief valves in the station were set at 1,440 psi and subject to the same pressure as the valve that opened. Because of this fact, targa has concluded that the relief valve that opened malfunctioned causing it to open prematurely. Targa replaced the relief valve that malfunctioned. This is the final report.
Detailed record list
Report Received Date
2019-10-28 00:00:00
Iyear
2019
Report Number
20190326
Supplemental Number
33196
Report Type
Supplemental Final
Operator Id
39823
Name
Targa Downstream Llc
Operator Street Address
811 Louisiana St. Suite 2100
Operator City Name
Houston
Operator State Abbreviation
TX
Operator Postal Code
77002
Local Datetime
2019-09-30 09:00:00
Location Latitude
32.31582
Location Longitude
-97.52846
Commodity Released Type
Hvl Or Other Flammable Or Toxic Fluid Which Is A Gas At Ambient Conditions
Commodity Subtype
Lpg (Liquefied Petroleum Gas) / Ngl (Natural Gas Liquid)
Unintentional Release Bbls
1.7
Intentional Release Bbls
0
Recovered Bbls
0
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Accident Identifier
Local Operating Personnel, Including Contractors
Operator Type
Operator Employee
Incident Identified Datetime
2019-09-30 09:00:00
System Part Involved
Onshore Pump/meter Station Equipment And Piping
On Off Shore
Onshore
Shutdown Due Accident Ind
No
Shutdown Explain
Very Short Activation Of Thermal Relief Valve. No Operational Need To Shut Down.
On Site Datetime
2019-09-30 09:30:00
Nrc Rpt Num
Nrc Notification Not Required
Ignite Ind
No
Explode Ind
No
Num Pub Evacuated
0
Pipe Fac Name
Grand Prix
Segment Name
Grand Prix North
Onshore State Abbreviation
Tx
Onshore Postal Code
70631
Onshore City Name
Cleburne
Onshore County Name
Johnson
Designated Location
Milepost/valve Station
Designated Name
Number 8
Federal
No
Location Type
Totally Contained On Operator-Controlled Property
Incident Area Type
Aboveground
Incident Area Subtype
Typical Aboveground Facility Piping Or Appurtenance
Crossing
No
Pipe Facility Type
Interstate
Item Involved
Valve
Valve Type
Relief Valve
Installation Year
2019
Material Involved
Carbon Steel
Release Type
Leak
Leak Type
Other
Leak Type Other
Relief Valve Release.
Wildlife Impact Ind
No
Soil Contamination
No
Long Term Assessment
No
Remediation Ind
No
Water Contam Ind
No
Could Be Hca
No
Commodity Reached Hca
No
Est Cost Oper Paid
0
Est Cost Gas Released
50
Est Cost Prop Damage
420
Est Cost Emergency
0
Est Cost Environmental
0
Est Cost Other
0
Prpty
470
Accident Psig
1426
Mop Psig
1440
Accident Pressure
Pressure Did Not Exceed Mop
Pressure Restriction Ind
No
Pipeline Function
> 20% Smys Regulated Transmission
Scada In Place Ind
Yes
Scada Operating Ind
Yes
Scada Functional Ind
Yes
Scada Detection Ind
No
Scada Conf Ind
No
Cpm In Place Ind
No
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
Pressure rise in pipeline caused by loss of electrical power of pump station. Controllers actions could not have affected loss of power nor activation of relief valve.
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
Relief Valve Ind
Yes
Eq Additional Other Ind
Yes
Eq Additional Other Details
Cause Of Relief Valve Activation Is Unknown.
Preparer Name
T** H*****
Preparer Title
Manager Regulatory Compliance
Preparer Email
T******@t*************.com
Preparer Telephone
3375835200
Preparer Fax
3375834630
Prepared Date
2020-01-16 00:00:00
Authorizer Name
T** H*****
Authorizer Telephone
3375835200
Authorizer Title
Manager Regulatory Compliance
Authorizer Email
T******@t*************.com
Narrative
On september 30th, 2019 a valve station lost electric power on targa's grand prix pipeline resulting in mainline valve closure at the station. The valve closure caused pressure to rise at the upstream valve stations on the pipeline. The rise in pressure caused a thermal relief valve to open and send ngl vapors to the station vent stack. Maximum pressure at the station was 1,426 psi. The relief valve set pressure was 1,440 psi. And the relief valve was tested in place on august 9, 2019 and opened 1,440 psi. Targa personnel were at the site at the time of the release and determined the release time to be 15 seconds. For that amount of time, the volume of ngl product released was 72 gallons. The other relief valves in the station were set at 1,440 psi and subject to the same pressure as the valve that opened. Because of this fact, targa has concluded that the relief valve that opened malfunctioned causing it to open prematurely. Targa replaced the relief valve that malfunctioned. This is the final report.
| Report Received Date | 2019-10-28 00:00:00 |
|---|---|
| Iyear | 2019 |
| Report Number | 20190326 |
| Supplemental Number | 33196 |
| Report Type | Supplemental Final |
| Operator Id | 39823 PHMSA Enforcement |
| Name | Targa Downstream Llc |
| Operator Street Address | 811 Louisiana St. Suite 2100 |
| Operator City Name | Houston |
| Operator State Abbreviation | TX |
| Operator Postal Code | 77002 |
| Local Datetime | 2019-09-30 09:00:00 |
| Location Latitude | 32.31582 Google Maps OpenStreetMap |
| Location Longitude | -97.52846 Google Maps OpenStreetMap |
| Commodity Released Type | Hvl Or Other Flammable Or Toxic Fluid Which Is A Gas At Ambient Conditions |
| Commodity Subtype | Lpg (Liquefied Petroleum Gas) / Ngl (Natural Gas Liquid) |
| Unintentional Release Bbls | 1.7 |
| Intentional Release Bbls | 0 |
| Recovered Bbls | 0 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Accident Identifier | Local Operating Personnel, Including Contractors |
| Operator Type | Operator Employee |
| Incident Identified Datetime | 2019-09-30 09:00:00 |
| System Part Involved | Onshore Pump/meter Station Equipment And Piping |
| On Off Shore | Onshore |
| Shutdown Due Accident Ind | No |
| Shutdown Explain | Very Short Activation Of Thermal Relief Valve. No Operational Need To Shut Down. |
| On Site Datetime | 2019-09-30 09:30:00 |
| Nrc Rpt Num | Nrc Notification Not Required NRC Report How to search |
| Ignite Ind | No |
| Explode Ind | No |
| Num Pub Evacuated | 0 |
| Pipe Fac Name | Grand Prix |
| Segment Name | Grand Prix North |
| Onshore State Abbreviation | Tx |
| Onshore Postal Code | 70631 |
| Onshore City Name | Cleburne |
| Onshore County Name | Johnson |
| Designated Location | Milepost/valve Station |
| Designated Name | Number 8 |
| Federal | No |
| Location Type | Totally Contained On Operator-Controlled Property |
| Incident Area Type | Aboveground |
| Incident Area Subtype | Typical Aboveground Facility Piping Or Appurtenance |
| Crossing | No |
| Pipe Facility Type | Interstate |
| Item Involved | Valve |
| Valve Type | Relief Valve |
| Installation Year | 2019 |
| Material Involved | Carbon Steel |
| Release Type | Leak |
| Leak Type | Other |
| Leak Type Other | Relief Valve Release. |
| Wildlife Impact Ind | No |
| Soil Contamination | No |
| Long Term Assessment | No |
| Remediation Ind | No |
| Water Contam Ind | No |
| Could Be Hca | No |
| Commodity Reached Hca | No |
| Est Cost Oper Paid | 0 |
| Est Cost Gas Released | 50 |
| Est Cost Prop Damage | 420 |
| Est Cost Emergency | 0 |
| Est Cost Environmental | 0 |
| Est Cost Other | 0 |
| Prpty | 470 |
| Accident Psig | 1426 |
| Mop Psig | 1440 |
| Accident Pressure | Pressure Did Not Exceed Mop |
| Pressure Restriction Ind | No |
| Pipeline Function | > 20% Smys Regulated Transmission |
| Scada In Place Ind | Yes |
| Scada Operating Ind | Yes |
| Scada Functional Ind | Yes |
| Scada Detection Ind | No |
| Scada Conf Ind | No |
| Cpm In Place Ind | No |
| 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 | Pressure rise in pipeline caused by loss of electrical power of pump station. Controllers actions could not have affected loss of power nor activation of relief valve. |
| 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 |
| Relief Valve Ind | Yes |
| Eq Additional Other Ind | Yes |
| Eq Additional Other Details | Cause Of Relief Valve Activation Is Unknown. |
| Preparer Name | T** H***** |
| Preparer Title | Manager Regulatory Compliance |
| Preparer Email | T******@t*************.com |
| Preparer Telephone | 3375835200 |
| Preparer Fax | 3375834630 |
| Prepared Date | 2020-01-16 00:00:00 |
| Authorizer Name | T** H***** |
| Authorizer Telephone | 3375835200 |
| Authorizer Title | Manager Regulatory Compliance |
| Authorizer Email | T******@t*************.com |
| Narrative | On september 30th, 2019 a valve station lost electric power on targa's grand prix pipeline resulting in mainline valve closure at the station. The valve closure caused pressure to rise at the upstream valve stations on the pipeline. The rise in pressure caused a thermal relief valve to open and send ngl vapors to the station vent stack. Maximum pressure at the station was 1,426 psi. The relief valve set pressure was 1,440 psi. And the relief valve was tested in place on august 9, 2019 and opened 1,440 psi. Targa personnel were at the site at the time of the release and determined the release time to be 15 seconds. For that amount of time, the volume of ngl product released was 72 gallons. The other relief valves in the station were set at 1,440 psi and subject to the same pressure as the valve that opened. Because of this fact, targa has concluded that the relief valve that opened malfunctioned causing it to open prematurely. Targa replaced the relief valve that malfunctioned. This is the final report. |
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