Incident details
Operator, cause, commodity and consequences with raw source fields.
HL incident on 2015-10-19 — TX
Operator
Enterprise Products Operating 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)
$162,000
Incident datetime
2015-10-19 10:00
Report number
Location
TX
Narrative
On 10/19/2015, during a field inspection, a small leak was identified on the enterprise aegis 20 inch mainline valve 14101 at sulphur station with a mx-6 lel meter. The leak was around bonnet flange gasket while in the open position. The ethane leak was only detectable within close proximity to the bonnet flange bolts. The valve was closed and the body was blown down with nitrogen and the leak stopped. At that time, it was estimated approximately 2 gallons of ethane was released and, therefore, the leak did not meet accident reporting criteria. The manufacturer sent a representative to the site to re-torque the bonnet flange bolts without success. On 10/29/2015, enterprise made the decision to replace the valve using a stopple bypass and, as a result, based on the projected cost of the repair, the leak met accident reporting criteria. The nrc and PHMSA were both immediately notified. The valve replacement has been completed and no issue were noted with new valve bonnet seal. The leaking valve was returned to southern california valve for evaluation. Disassembly/removal of the bonnet and inspection of the seal area revealed the body/bonnet spiral wound gasket showed to be compressed evenly, however, the outer ring of the spiral wound gasket had extruded in a small section of the gasket. It is believed the cause of the bonnet leak was the spiral wound flat gasket out ring extruded which had impact on the o-ring sealing surface. This gasket extrusion is not a normal occurrence and appears to be an isolated incident.
Detailed record list
Report Received Date
2015-11-17 00:00:00
Iyear
2015
Report Number
20150411
Supplemental Number
21146
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
2015-10-19 10:00:00
Location Latitude
30.164856
Location Longitude
-93.35175
Commodity Released Type
Hvl Or Other Flammable Or Toxic Fluid Which Is A Gas At Ambient Conditions
Commodity Subtype
Other Hvl
Commodity Details
Ethane
Unintentional Release Bbls
0.05
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
Contractor Working For The Operator
Incident Identified Datetime
2015-10-19 10:00:00
System Part Involved
Onshore Pipeline, Including Valve Sites
On Off Shore
Onshore
Shutdown Due Accident Ind
No
Shutdown Explain
Valve Bonnett Leak Stops In Closed Position.
On Site Datetime
2015-10-19 10:00:00
Nrc Rpt Datetime
2015-10-29 16:30:00
Nrc Rpt Num
1132066
Ignite Ind
No
Explode Ind
No
Upstream Valve Type Ind
Manual
Downstream Valve Type Ind
Manual
Num Pub Evacuated
0
Pipe Fac Name
Aegis Pipeline
Segment Name
24600
Onshore State Abbreviation
La
Onshore Postal Code
70663
Onshore City Name
Sulphur
Onshore County Name
Calcasieu
Designated Location
Milepost/valve Station
Designated Name
47.81
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
Mainline
Valve Mainline Type
Gate
Valve Manufacturer
South California Power Seal
Installation Year
2015
Manufactured Year
2013
Material Involved
Carbon Steel
Release Type
Leak
Leak Type
Other
Leak Type Other
Bonnet Flange Gasket Leak
Wildlife Impact Ind
No
Soil Contamination
No
Long Term Assessment
No
Remediation Ind
No
Water Contam Ind
No
Could Be Hca
Yes
Commodity Reached Hca
No
Est Cost Oper Paid
0
Est Cost Gas Released
1
Est Cost Prop Damage
162000
Est Cost Emergency
0
Est Cost Environmental
0
Est Cost Other
0
Prpty
162001
Accident Psig
1150
Mop Psig
1480
Accident Pressure
Pressure Did Not Exceed Mop
Pressure Restriction Ind
No
Length Segment Isolated
1
Internal Inspection Ind
Yes
Operation Complications 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
Yes
Cpm Operating Ind
Yes
Cpm Functional Ind
Yes
Cpm Detection Ind
No
Cpm Conf 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
Third party operations discovered leak thus control room actions were not a factor in this incident.
Employee Drug Test Ind
No
Contractor Drug Test Ind
No
Cause
Equipment Failure
Cause Details
Non-Threaded Connection Failure
Eq Failure Type
Non-Threaded Connection Failure
Other Non Threaded Ind
Gasket
Eq Additional Other Ind
Yes
Eq Additional Other Details
Leaking Bonnet Flange Gasket
Preparer Name
N***** L* G*** J**
Preparer Title
Senior Pipeline Compliance Specialist
Preparer Email
N****@e****.com
Preparer Telephone
985-493-4629
Preparer Fax
985-448-1857
Prepared Date
2016-02-19 00:00:00
Authorizer Name
N***** L* G*** J**
Authorizer Telephone
985-493-4629
Authorizer Title
Senior Pipeline Compliance Specialist
Authorizer Email
N****@e****.com
Narrative
On 10/19/2015, during a field inspection, a small leak was identified on the enterprise aegis 20 inch mainline valve 14101 at sulphur station with a mx-6 lel meter. The leak was around bonnet flange gasket while in the open position. The ethane leak was only detectable within close proximity to the bonnet flange bolts. The valve was closed and the body was blown down with nitrogen and the leak stopped. At that time, it was estimated approximately 2 gallons of ethane was released and, therefore, the leak did not meet accident reporting criteria. The manufacturer sent a representative to the site to re-torque the bonnet flange bolts without success. On 10/29/2015, enterprise made the decision to replace the valve using a stopple bypass and, as a result, based on the projected cost of the repair, the leak met accident reporting criteria. The nrc and PHMSA were both immediately notified. The valve replacement has been completed and no issue were noted with new valve bonnet seal. The leaking valve was returned to southern california valve for evaluation. Disassembly/removal of the bonnet and inspection of the seal area revealed the body/bonnet spiral wound gasket showed to be compressed evenly, however, the outer ring of the spiral wound gasket had extruded in a small section of the gasket. It is believed the cause of the bonnet leak was the spiral wound flat gasket out ring extruded which had impact on the o-ring sealing surface. This gasket extrusion is not a normal occurrence and appears to be an isolated incident.
| Report Received Date | 2015-11-17 00:00:00 |
|---|---|
| Iyear | 2015 |
| Report Number | 20150411 |
| Supplemental Number | 21146 |
| 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 | 2015-10-19 10:00:00 |
| Location Latitude | 30.164856 Google Maps OpenStreetMap |
| Location Longitude | -93.35175 Google Maps OpenStreetMap |
| Commodity Released Type | Hvl Or Other Flammable Or Toxic Fluid Which Is A Gas At Ambient Conditions |
| Commodity Subtype | Other Hvl |
| Commodity Details | Ethane |
| Unintentional Release Bbls | 0.05 |
| 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 | Contractor Working For The Operator |
| Incident Identified Datetime | 2015-10-19 10:00:00 |
| System Part Involved | Onshore Pipeline, Including Valve Sites |
| On Off Shore | Onshore |
| Shutdown Due Accident Ind | No |
| Shutdown Explain | Valve Bonnett Leak Stops In Closed Position. |
| On Site Datetime | 2015-10-19 10:00:00 |
| Nrc Rpt Datetime | 2015-10-29 16:30:00 |
| Nrc Rpt Num | 1132066 NRC Report How to search |
| Ignite Ind | No |
| Explode Ind | No |
| Upstream Valve Type Ind | Manual |
| Downstream Valve Type Ind | Manual |
| Num Pub Evacuated | 0 |
| Pipe Fac Name | Aegis Pipeline |
| Segment Name | 24600 |
| Onshore State Abbreviation | La |
| Onshore Postal Code | 70663 |
| Onshore City Name | Sulphur |
| Onshore County Name | Calcasieu |
| Designated Location | Milepost/valve Station |
| Designated Name | 47.81 |
| 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 | Mainline |
| Valve Mainline Type | Gate |
| Valve Manufacturer | South California Power Seal |
| Installation Year | 2015 |
| Manufactured Year | 2013 |
| Material Involved | Carbon Steel |
| Release Type | Leak |
| Leak Type | Other |
| Leak Type Other | Bonnet Flange Gasket Leak |
| Wildlife Impact Ind | No |
| Soil Contamination | No |
| Long Term Assessment | No |
| Remediation Ind | No |
| Water Contam Ind | No |
| Could Be Hca | Yes |
| Commodity Reached Hca | No |
| Est Cost Oper Paid | 0 |
| Est Cost Gas Released | 1 |
| Est Cost Prop Damage | 162000 |
| Est Cost Emergency | 0 |
| Est Cost Environmental | 0 |
| Est Cost Other | 0 |
| Prpty | 162001 |
| Accident Psig | 1150 |
| Mop Psig | 1480 |
| Accident Pressure | Pressure Did Not Exceed Mop |
| Pressure Restriction Ind | No |
| Length Segment Isolated | 1 |
| Internal Inspection Ind | Yes |
| Operation Complications 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 | Yes |
| Cpm Operating Ind | Yes |
| Cpm Functional Ind | Yes |
| Cpm Detection Ind | No |
| Cpm Conf 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 | Third party operations discovered leak thus control room actions were not a factor in this incident. |
| Employee Drug Test Ind | No |
| Contractor Drug Test Ind | No |
| Cause | Equipment Failure |
| Cause Details | Non-Threaded Connection Failure |
| Eq Failure Type | Non-Threaded Connection Failure |
| Other Non Threaded Ind | Gasket |
| Eq Additional Other Ind | Yes |
| Eq Additional Other Details | Leaking Bonnet Flange Gasket |
| Preparer Name | N***** L* G*** J** |
| Preparer Title | Senior Pipeline Compliance Specialist |
| Preparer Email | N****@e****.com |
| Preparer Telephone | 985-493-4629 |
| Preparer Fax | 985-448-1857 |
| Prepared Date | 2016-02-19 00:00:00 |
| Authorizer Name | N***** L* G*** J** |
| Authorizer Telephone | 985-493-4629 |
| Authorizer Title | Senior Pipeline Compliance Specialist |
| Authorizer Email | N****@e****.com |
| Narrative | On 10/19/2015, during a field inspection, a small leak was identified on the enterprise aegis 20 inch mainline valve 14101 at sulphur station with a mx-6 lel meter. The leak was around bonnet flange gasket while in the open position. The ethane leak was only detectable within close proximity to the bonnet flange bolts. The valve was closed and the body was blown down with nitrogen and the leak stopped. At that time, it was estimated approximately 2 gallons of ethane was released and, therefore, the leak did not meet accident reporting criteria. The manufacturer sent a representative to the site to re-torque the bonnet flange bolts without success. On 10/29/2015, enterprise made the decision to replace the valve using a stopple bypass and, as a result, based on the projected cost of the repair, the leak met accident reporting criteria. The nrc and PHMSA were both immediately notified. The valve replacement has been completed and no issue were noted with new valve bonnet seal. The leaking valve was returned to southern california valve for evaluation. Disassembly/removal of the bonnet and inspection of the seal area revealed the body/bonnet spiral wound gasket showed to be compressed evenly, however, the outer ring of the spiral wound gasket had extruded in a small section of the gasket. It is believed the cause of the bonnet leak was the spiral wound flat gasket out ring extruded which had impact on the o-ring sealing surface. This gasket extrusion is not a normal occurrence and appears to be an isolated incident. |
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