Incident details
Operator, cause, commodity and consequences with raw source fields.
GD incident on 2014-11-24 — PA
Operator
Ugi Penn Natural Gas
Cause
Equipment Failure
Commodity
Natural Gas
Program
GD
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$21,000
Incident datetime
2014-11-24 07:31
Report number
Location
PA, LACKAWANNA
Narrative
A pressure relief valve on a regulator station opened and vented an estimated 3.5mm cubic feet of natural gas. Root cause investigation revealed that the regulators for the control gas to the positioner on the control valve failed, which resulted in excessive pressure beyond the control valve and the opening of the relief valve providing over-pressure protection to the downstream system. After the relief valve opened, the valve failed to re-seat due to a piece of weld slag on the seat of the relief. In response to the incident, crews shut the inlet valve to the regulator station, however the relief continued to vent due to the slag on seat of the relief. The issue was resolved at approximately 8:59 am when the outlet valve to the station was closed. The incident is being reported on the basis of the volumetric reporting criteria. Subsequent to the incident, and before returning the station to service, a dedicated filter was placed in front of the regulators to the instrument gas to minimize the probability of re-occurrence. Additionally, a relief valve was added to the instrument gas lines as supplemental over-pressure protection and supply gas tubing lines were relocated to minimize vibration. Finally, additional periodic maintenance has been implemented to insure the remediation measures taken remain adequate. 6/1/2018 supplemental report submitted to indicate report as "final"
Detailed record list
Occurred At
2014-11-24 07:31:00
Year
2014
Report Received Date
2014-11-25 00:00:00
Iyear
2014.0
Report Number
20140106.0
Supplemental Number
30432.0
Report Type
Supplemental Final
Operator Id
15259
Name
Ugi Penn Natural Gas
Operator Street Address
1 Ugi Drive
Operator City Name
Denver
Operator State Abbreviation
PA
Operator Postal Code
17517
Local Datetime
2014-11-24 07:31:00
Location Street Address
1600 Main
Location City Name
Dickson City
Location County Name
Lackawanna
Location State Abbreviation
PA
Location Postal Code
18519
Location Latitude
41.469832
Location Longitude
-75.608954
Nrc Rpt Datetime
2014-11-24 18:04:00
Nrc Rpt Num
1101892
Commodity Released Type
Natural Gas
Unintentional Release
3534.0
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Ignite Ind
No
Explode Ind
No
Num Pub Evacuated
25.0
Incident Identified Datetime
2014-11-24 07:31:00
On Site Datetime
2014-11-24 07:49:00
Federal
No
Location Type
Operator-Controlled Property
Incident Area Type
Aboveground
Incident Area Subtype
Typical Aboveground Facility Piping Or Appurtenance (E.g. Value Or Regulator Station, Outdoor Meter Set)
Crossing
No
Pipe Facility Type
Privately Owned
System Part Involved
District Regulator/metering Station
Installation Year
2014.0
Material Involved
Other
Material Details
Pressure Relief Valve
Release Type
Other
Release Type Details
Pressure Relief Valve / Over-Pressure Protection
Class Location Type
Class 3 Location
Est Cost Oper Paid
0.0
Est Cost Prop Damage
21000.0
Est Cost Emergency
1500.0
Est Cost Other
0.0
Est Cost Unintentional Release
18000.0
Prpty
40500.0
Commercial Affected
0.0
Industrial Affected
0.0
Residences Affected
0.0
Accident Psig
297.0
Normal Psig
270.0
Mop Psig
282.0
Accident Pressure
Pressure Exceeded Maop, But Did Not Exceed The Applicable Allowance In 192.201
Scada In Place Ind
Yes
Scada Operating Ind
Yes
Scada Functional Ind
Yes
Scada Detection Ind
Yes
Scada Conf Ind
Yes
Accident Identifier
Notification From Emergency Responder
Investigation Status
Yes, specify investigation result(s): (select all that apply)
Invest No Control Room Ind
Yes
Invest No Controller Ind
Yes
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
Pressure Regulator Ind
Yes
Preparer Name
F**** B******
Preparer Title
Director Engineering And Technical Services
Preparer Email
F*******@u**.com
Preparer Telephone
610-458-3567
Authorizer Name
H*** B***
Authorizer Title
Chief Operating Officer
Authorizer Telephone
610-796-3450
Authorizer Email
H****@u**.com
Narrative
A pressure relief valve on a regulator station opened and vented an estimated 3.5mm cubic feet of natural gas. Root cause investigation revealed that the regulators for the control gas to the positioner on the control valve failed, which resulted in excessive pressure beyond the control valve and the opening of the relief valve providing over-pressure protection to the downstream system. After the relief valve opened, the valve failed to re-seat due to a piece of weld slag on the seat of the relief. In response to the incident, crews shut the inlet valve to the regulator station, however the relief continued to vent due to the slag on seat of the relief. The issue was resolved at approximately 8:59 am when the outlet valve to the station was closed. The incident is being reported on the basis of the volumetric reporting criteria. Subsequent to the incident, and before returning the station to service, a dedicated filter was placed in front of the regulators to the instrument gas to minimize the probability of re-occurrence. Additionally, a relief valve was added to the instrument gas lines as supplemental over-pressure protection and supply gas tubing lines were relocated to minimize vibration. Finally, additional periodic maintenance has been implemented to insure the remediation measures taken remain adequate. 6/1/2018 supplemental report submitted to indicate report as "final"
| Occurred At | 2014-11-24 07:31:00 |
|---|---|
| Year | 2014 |
| Report Received Date | 2014-11-25 00:00:00 |
| Iyear | 2014.0 |
| Report Number | 20140106.0 |
| Supplemental Number | 30432.0 |
| Report Type | Supplemental Final |
| Operator Id | 15259 PHMSA Enforcement |
| Name | Ugi Penn Natural Gas |
| Operator Street Address | 1 Ugi Drive |
| Operator City Name | Denver |
| Operator State Abbreviation | PA |
| Operator Postal Code | 17517 |
| Local Datetime | 2014-11-24 07:31:00 |
| Location Street Address | 1600 Main |
| Location City Name | Dickson City |
| Location County Name | Lackawanna |
| Location State Abbreviation | PA |
| Location Postal Code | 18519 |
| Location Latitude | 41.469832 Google Maps OpenStreetMap |
| Location Longitude | -75.608954 Google Maps OpenStreetMap |
| Nrc Rpt Datetime | 2014-11-24 18:04:00 |
| Nrc Rpt Num | 1101892 NRC Report How to search |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 3534.0 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Ignite Ind | No |
| Explode Ind | No |
| Num Pub Evacuated | 25.0 |
| Incident Identified Datetime | 2014-11-24 07:31:00 |
| On Site Datetime | 2014-11-24 07:49:00 |
| Federal | No |
| Location Type | Operator-Controlled Property |
| Incident Area Type | Aboveground |
| Incident Area Subtype | Typical Aboveground Facility Piping Or Appurtenance (E.g. Value Or Regulator Station, Outdoor Meter Set) |
| Crossing | No |
| Pipe Facility Type | Privately Owned |
| System Part Involved | District Regulator/metering Station |
| Installation Year | 2014.0 |
| Material Involved | Other |
| Material Details | Pressure Relief Valve |
| Release Type | Other |
| Release Type Details | Pressure Relief Valve / Over-Pressure Protection |
| Class Location Type | Class 3 Location |
| Est Cost Oper Paid | 0.0 |
| Est Cost Prop Damage | 21000.0 |
| Est Cost Emergency | 1500.0 |
| Est Cost Other | 0.0 |
| Est Cost Unintentional Release | 18000.0 |
| Prpty | 40500.0 |
| Commercial Affected | 0.0 |
| Industrial Affected | 0.0 |
| Residences Affected | 0.0 |
| Accident Psig | 297.0 |
| Normal Psig | 270.0 |
| Mop Psig | 282.0 |
| Accident Pressure | Pressure Exceeded Maop, But Did Not Exceed The Applicable Allowance In 192.201 |
| Scada In Place Ind | Yes |
| Scada Operating Ind | Yes |
| Scada Functional Ind | Yes |
| Scada Detection Ind | Yes |
| Scada Conf Ind | Yes |
| Accident Identifier | Notification From Emergency Responder |
| Investigation Status | Yes, specify investigation result(s): (select all that apply) |
| Invest No Control Room Ind | Yes |
| Invest No Controller Ind | Yes |
| 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 |
| Pressure Regulator Ind | Yes |
| Preparer Name | F**** B****** |
| Preparer Title | Director Engineering And Technical Services |
| Preparer Email | F*******@u**.com |
| Preparer Telephone | 610-458-3567 |
| Authorizer Name | H*** B*** |
| Authorizer Title | Chief Operating Officer |
| Authorizer Telephone | 610-796-3450 |
| Authorizer Email | H****@u**.com |
| Narrative | A pressure relief valve on a regulator station opened and vented an estimated 3.5mm cubic feet of natural gas. Root cause investigation revealed that the regulators for the control gas to the positioner on the control valve failed, which resulted in excessive pressure beyond the control valve and the opening of the relief valve providing over-pressure protection to the downstream system. After the relief valve opened, the valve failed to re-seat due to a piece of weld slag on the seat of the relief. In response to the incident, crews shut the inlet valve to the regulator station, however the relief continued to vent due to the slag on seat of the relief. The issue was resolved at approximately 8:59 am when the outlet valve to the station was closed. The incident is being reported on the basis of the volumetric reporting criteria. Subsequent to the incident, and before returning the station to service, a dedicated filter was placed in front of the regulators to the instrument gas to minimize the probability of re-occurrence. Additionally, a relief valve was added to the instrument gas lines as supplemental over-pressure protection and supply gas tubing lines were relocated to minimize vibration. Finally, additional periodic maintenance has been implemented to insure the remediation measures taken remain adequate. 6/1/2018 supplemental report submitted to indicate report as "final" |
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