Incident details
Operator, cause, commodity and consequences with raw source fields.
GTG incident on 2015-03-04 — TX
Operator
Enterprise Products Operating Llc
Cause
Equipment Failure
Commodity
Natural Gas
Program
GTG
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$0
Incident datetime
2015-03-04 23:08
Report number
Location
TX
Narrative
On 3/4/2015 at 23:00 the 8 inch relief valve at the hilbig regulator station for line 36 prematurely actuated venting natural gas to the atmosphere. A nearby resident reported the event to enterprise pipeline control at 23:08 and an enterprise technician was dispatched to the hilbig regulator station. Upon technician's arrival at 00:05 on 3/5/2015, the technician found the relief valve had reset itself. Upon further investigation, it was discovered that the relief valve operated prematurely below its set point. The cause for the premature actuation was due to hydrates freezing in the pilot regulator/sensing line. Later on 3/5/2015, the relief valve was tested several times and functioned properly each time at the desired set point. The corrective action to prevent future recurrence includes replacing pilot with one more suitable for colder temperatures and installing a knock-out cylinder in sensing line. Corrective action taken: installed new regulator with filter.
Detailed record list
Report Received Date
2015-04-02 00:00:00
Iyear
2015
Report Number
20150046
Supplemental Number
16759
Report Type
Supplemental Final
Operator Id
31618
Name
Enterprise Products Operating Llc
Operator Street Address
1100 Louisiana Street
Operator City Name
Houston
Operator State Abbreviation
TX
Operator Postal Code
77002
Local Datetime
2015-03-04 23:00:00
Location Latitude
30.008849
Location Longitude
-97.418842
Nrc Rpt Num
1109679
Nrc Rpt Datetime
2015-03-05 01:35:00
Commodity Released Type
Natural Gas
Unintentional Release
6190
Intentional Release
0
Accompanying Liquid
0
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Shutdown Due Accident Ind
No
Shutdown Explain
Relief Valve Reset Itself
Ignite Ind
No
Explode Ind
No
Num Pub Evacuated
0
Incident Identified Datetime
2015-03-04 23:08:00
On Site Datetime
2015-03-05 00:05:00
On Off Shore
Onshore
Onshore State Abbreviation
Tx
Onshore Postal Code
78602
Onshore City Name
Bastrop
Onshore County Name
Bastrop
Designated Location
Milepost
Designated Name
Valve Station
Pipe Fac Name
Hilbig Regulator Station
Segment Name
Bastrop Lateral-Line 36
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
Intrastate
System Part Involved
Onshore Regulator/metering Station Equipment And Piping
Item Involved
Valve
Valve Type
Relief Valve
Installation Year
2012
Material Involved
Carbon Steel
Release Type
Other
Release Type Details
Relief Valve Vented Prematurely.
Class Location Type
Class 1 Location
Could Be Hca
No
Pir Radius
373
Heat Damage Ind
No
Non Heat Damage Ind
No
Hca Fatalities Ind
No
Est Cost Oper Paid
0
Est Cost Unintentional Release
18260
Est Cost Intentional Release
0
Est Cost Prop Damage
0
Est Cost Emergency
200
Est Cost Other
100
Est Cost Other Details
Cost For Technicians Labor And Time For Testing/inspection Of Relief Valve.
Prpty
18560
Accident Psig
697
Mop Psig
730
Mop Cfr Section
192.619(A)(1)
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
No
Scada Conf Ind
Yes
Accident Identifier
Notification From Public
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, the operator did not find that an investigation of the controller(s) actions or control room issues was necessary. Leak was not detectable by controller in the control room; therefore, controller was not the cause nor a contributing factor to the incident. No other factors were determined requiring an investigation.
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
Accumulation Of Hydrates In Pilot/sensing Line And Freezing Temperatures
Preparer Name
M****** D* S****
Preparer Title
Compliance Specialist
Preparer Email
M******@e****.com
Preparer Telephone
713-381-5650
Authorizer Name
M****** D* S****
Authorizer Title
Compliance Specialist
Authorizer Telephone
713-381-5650
Authorizer Email
M******@e****.com
Narrative
On 3/4/2015 at 23:00 the 8 inch relief valve at the hilbig regulator station for line 36 prematurely actuated venting natural gas to the atmosphere. A nearby resident reported the event to enterprise pipeline control at 23:08 and an enterprise technician was dispatched to the hilbig regulator station. Upon technician's arrival at 00:05 on 3/5/2015, the technician found the relief valve had reset itself. Upon further investigation, it was discovered that the relief valve operated prematurely below its set point. The cause for the premature actuation was due to hydrates freezing in the pilot regulator/sensing line. Later on 3/5/2015, the relief valve was tested several times and functioned properly each time at the desired set point. The corrective action to prevent future recurrence includes replacing pilot with one more suitable for colder temperatures and installing a knock-out cylinder in sensing line. Corrective action taken: installed new regulator with filter.
| Report Received Date | 2015-04-02 00:00:00 |
|---|---|
| Iyear | 2015 |
| Report Number | 20150046 |
| Supplemental Number | 16759 |
| Report Type | Supplemental Final |
| Operator Id | 31618 PHMSA Enforcement |
| Name | Enterprise Products Operating Llc |
| Operator Street Address | 1100 Louisiana Street |
| Operator City Name | Houston |
| Operator State Abbreviation | TX |
| Operator Postal Code | 77002 |
| Local Datetime | 2015-03-04 23:00:00 |
| Location Latitude | 30.008849 Google Maps OpenStreetMap |
| Location Longitude | -97.418842 Google Maps OpenStreetMap |
| Nrc Rpt Num | 1109679 NRC Report How to search |
| Nrc Rpt Datetime | 2015-03-05 01:35:00 |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 6190 |
| Intentional Release | 0 |
| Accompanying Liquid | 0 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Shutdown Due Accident Ind | No |
| Shutdown Explain | Relief Valve Reset Itself |
| Ignite Ind | No |
| Explode Ind | No |
| Num Pub Evacuated | 0 |
| Incident Identified Datetime | 2015-03-04 23:08:00 |
| On Site Datetime | 2015-03-05 00:05:00 |
| On Off Shore | Onshore |
| Onshore State Abbreviation | Tx |
| Onshore Postal Code | 78602 |
| Onshore City Name | Bastrop |
| Onshore County Name | Bastrop |
| Designated Location | Milepost |
| Designated Name | Valve Station |
| Pipe Fac Name | Hilbig Regulator Station |
| Segment Name | Bastrop Lateral-Line 36 |
| 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 | Intrastate |
| System Part Involved | Onshore Regulator/metering Station Equipment And Piping |
| Item Involved | Valve |
| Valve Type | Relief Valve |
| Installation Year | 2012 |
| Material Involved | Carbon Steel |
| Release Type | Other |
| Release Type Details | Relief Valve Vented Prematurely. |
| Class Location Type | Class 1 Location |
| Could Be Hca | No |
| Pir Radius | 373 |
| Heat Damage Ind | No |
| Non Heat Damage Ind | No |
| Hca Fatalities Ind | No |
| Est Cost Oper Paid | 0 |
| Est Cost Unintentional Release | 18260 |
| Est Cost Intentional Release | 0 |
| Est Cost Prop Damage | 0 |
| Est Cost Emergency | 200 |
| Est Cost Other | 100 |
| Est Cost Other Details | Cost For Technicians Labor And Time For Testing/inspection Of Relief Valve. |
| Prpty | 18560 |
| Accident Psig | 697 |
| Mop Psig | 730 |
| Mop Cfr Section | 192.619(A)(1) 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 | No |
| Scada Conf Ind | Yes |
| Accident Identifier | Notification From Public |
| 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, the operator did not find that an investigation of the controller(s) actions or control room issues was necessary. Leak was not detectable by controller in the control room; therefore, controller was not the cause nor a contributing factor to the incident. No other factors were determined requiring an investigation. |
| 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 | Accumulation Of Hydrates In Pilot/sensing Line And Freezing Temperatures |
| Preparer Name | M****** D* S**** |
| Preparer Title | Compliance Specialist |
| Preparer Email | M******@e****.com |
| Preparer Telephone | 713-381-5650 |
| Authorizer Name | M****** D* S**** |
| Authorizer Title | Compliance Specialist |
| Authorizer Telephone | 713-381-5650 |
| Authorizer Email | M******@e****.com |
| Narrative | On 3/4/2015 at 23:00 the 8 inch relief valve at the hilbig regulator station for line 36 prematurely actuated venting natural gas to the atmosphere. A nearby resident reported the event to enterprise pipeline control at 23:08 and an enterprise technician was dispatched to the hilbig regulator station. Upon technician's arrival at 00:05 on 3/5/2015, the technician found the relief valve had reset itself. Upon further investigation, it was discovered that the relief valve operated prematurely below its set point. The cause for the premature actuation was due to hydrates freezing in the pilot regulator/sensing line. Later on 3/5/2015, the relief valve was tested several times and functioned properly each time at the desired set point. The corrective action to prevent future recurrence includes replacing pilot with one more suitable for colder temperatures and installing a knock-out cylinder in sensing line. Corrective action taken: installed new regulator with filter. |
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