Incident details
Operator, cause, commodity and consequences with raw source fields.
GD incident on 2011-03-24 — MN
Operator
Northern States Power Co Of Minnesota
Cause
Incorrect Operation
Commodity
Natural Gas
Program
GD
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$0
Incident datetime
2011-03-24 10:36
Report number
Location
MN, RAMSEY
Narrative
Part a #16 - total number of people was not tracked since several commercial or public buildings were evacuated. 12 buildings were evacuated. A 12 inch end cap blew off the end of a 60 psig steel gas main while resetting the sealing element during a stopple procedure. A temporary compression end cap was installed on the end of the main. As the tapper worked to reset the stopper, gas immediately built up on the temporary compression cap and the pressure caused the cap to blow off the main. When the main was blowing the tapper momentarily was able to re-stop the flow of gas by resetting the stopper but then the sealing element on the stopper partially rolled causing a void of approximately 12 square inches around the sealing element, allowing gas to escape.
Detailed record list
Occurred At
2011-03-24 10:36:00
Year
2011
Report Received Date
2011-04-22 00:00:00
Iyear
2011.0
Report Number
20110065.0
Supplemental Number
15323.0
Report Type
Supplemental Final
Operator Id
31636
Name
Northern States Power Co Of Minnesota
Operator Street Address
414 Nicollet Mall
Operator City Name
Minneapolis
Operator State Abbreviation
MN
Operator Postal Code
55402
Local Datetime
2011-03-24 10:36:00
Location Street Address
University Ave And Fry
Location City Name
Saint Paul
Location County Name
Ramsey
Location State Abbreviation
MN
Location Postal Code
55104-3820
Location Latitude
44.95584
Location Longitude
-93.16957
Nrc Rpt Datetime
2011-03-24 15:24:00
Nrc Rpt Num
974055
Commodity Released Type
Natural Gas
Unintentional Release
1681.0
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Ignite Ind
No
Explode Ind
No
Incident Identified Datetime
2011-03-24 10:36:00
On Site Datetime
2011-03-24 10:36:00
Federal
No
Location Type
Public Property
Incident Area Type
Underground
Incident Area Subtype
Exposed Due To Excavation
Crossing
Yes
Road Crossing Ind
Yes
Road Type
Uncased
Pipe Facility Type
Privately Owned
System Part Involved
Main
Installation Year
1986.0
Pipe Diameter
12.0
Pipe Specification
Api 5l
Pipe Manufacturer
Unknown
Material Involved
Steel
Steel Seam Type
Other
Steel Seam Type Details
Unknown
Wt Steel
0.25
Release Type
Leak
Leak Type
Seal Or Packing
Class Location Type
Class 3 Location
Est Cost Oper Paid
0.0
Est Cost Prop Damage
0.0
Est Cost Emergency
7343.0
Est Cost Other
0.0
Est Cost Other Details
0
Est Cost Unintentional Release
13500.0
Prpty
20843.0
Commercial Affected
51.0
Industrial Affected
0.0
Residences Affected
709.0
Accident Psig
60.0
Normal Psig
60.0
Mop Psig
66.0
Accident Pressure
Pressure Did Not Exceed Maop
Scada In Place Ind
No
Accident Identifier
Local Operating Personnel, Including Contractors
Operator Type
Operator Employee
Investigation Status
No, the facility was not monitored by a controller(s) at the time of the incident
Employee Drug Test Ind
Yes
Num Employees Tested
8
Num Employees Failed
0
Contractor Drug Test Ind
No
Cause
Incorrect Operation
Cause Details
Equipment Not Installed Properly
Operation Type
Equipment Not Installed Properly
Related Failure Follow Ind
Yes
Category Type
Decommissioning
Operator Qualification Ind
Yes
Qualified Individuals
Yes, They Were Qualified For The Task(S)
Preparer Name
J*** B******
Preparer Title
Gas Engineer
Preparer Email
J*************@x*********.com
Preparer Telephone
651-229-5515
Preparer Fax
651-229-2376
Authorizer Name
W****** K******
Authorizer Title
Vp Control Center
Authorizer Telephone
651-229-2435
Authorizer Email
W****************@x*********.com
Narrative
Part a #16 - total number of people was not tracked since several commercial or public buildings were evacuated. 12 buildings were evacuated. A 12 inch end cap blew off the end of a 60 psig steel gas main while resetting the sealing element during a stopple procedure. A temporary compression end cap was installed on the end of the main. As the tapper worked to reset the stopper, gas immediately built up on the temporary compression cap and the pressure caused the cap to blow off the main. When the main was blowing the tapper momentarily was able to re-stop the flow of gas by resetting the stopper but then the sealing element on the stopper partially rolled causing a void of approximately 12 square inches around the sealing element, allowing gas to escape.
| Occurred At | 2011-03-24 10:36:00 |
|---|---|
| Year | 2011 |
| Report Received Date | 2011-04-22 00:00:00 |
| Iyear | 2011.0 |
| Report Number | 20110065.0 |
| Supplemental Number | 15323.0 |
| Report Type | Supplemental Final |
| Operator Id | 31636 PHMSA Enforcement |
| Name | Northern States Power Co Of Minnesota |
| Operator Street Address | 414 Nicollet Mall |
| Operator City Name | Minneapolis |
| Operator State Abbreviation | MN |
| Operator Postal Code | 55402 |
| Local Datetime | 2011-03-24 10:36:00 |
| Location Street Address | University Ave And Fry |
| Location City Name | Saint Paul |
| Location County Name | Ramsey |
| Location State Abbreviation | MN |
| Location Postal Code | 55104-3820 |
| Location Latitude | 44.95584 Google Maps OpenStreetMap |
| Location Longitude | -93.16957 Google Maps OpenStreetMap |
| Nrc Rpt Datetime | 2011-03-24 15:24:00 |
| Nrc Rpt Num | 974055 NRC Report How to search |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 1681.0 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Ignite Ind | No |
| Explode Ind | No |
| Incident Identified Datetime | 2011-03-24 10:36:00 |
| On Site Datetime | 2011-03-24 10:36:00 |
| Federal | No |
| Location Type | Public Property |
| Incident Area Type | Underground |
| Incident Area Subtype | Exposed Due To Excavation |
| Crossing | Yes |
| Road Crossing Ind | Yes |
| Road Type | Uncased |
| Pipe Facility Type | Privately Owned |
| System Part Involved | Main |
| Installation Year | 1986.0 |
| Pipe Diameter | 12.0 |
| Pipe Specification | Api 5l |
| Pipe Manufacturer | Unknown |
| Material Involved | Steel |
| Steel Seam Type | Other |
| Steel Seam Type Details | Unknown |
| Wt Steel | 0.25 |
| Release Type | Leak |
| Leak Type | Seal Or Packing |
| Class Location Type | Class 3 Location |
| Est Cost Oper Paid | 0.0 |
| Est Cost Prop Damage | 0.0 |
| Est Cost Emergency | 7343.0 |
| Est Cost Other | 0.0 |
| Est Cost Other Details | 0 |
| Est Cost Unintentional Release | 13500.0 |
| Prpty | 20843.0 |
| Commercial Affected | 51.0 |
| Industrial Affected | 0.0 |
| Residences Affected | 709.0 |
| Accident Psig | 60.0 |
| Normal Psig | 60.0 |
| Mop Psig | 66.0 |
| Accident Pressure | Pressure Did Not Exceed Maop |
| Scada In Place Ind | No |
| Accident Identifier | Local Operating Personnel, Including Contractors |
| Operator Type | Operator Employee |
| Investigation Status | No, the facility was not monitored by a controller(s) at the time of the incident |
| Employee Drug Test Ind | Yes |
| Num Employees Tested | 8 |
| Num Employees Failed | 0 |
| Contractor Drug Test Ind | No |
| Cause | Incorrect Operation |
| Cause Details | Equipment Not Installed Properly |
| Operation Type | Equipment Not Installed Properly |
| Related Failure Follow Ind | Yes |
| Category Type | Decommissioning |
| Operator Qualification Ind | Yes |
| Qualified Individuals | Yes, They Were Qualified For The Task(S) |
| Preparer Name | J*** B****** |
| Preparer Title | Gas Engineer |
| Preparer Email | J*************@x*********.com |
| Preparer Telephone | 651-229-5515 |
| Preparer Fax | 651-229-2376 |
| Authorizer Name | W****** K****** |
| Authorizer Title | Vp Control Center |
| Authorizer Telephone | 651-229-2435 |
| Authorizer Email | W****************@x*********.com |
| Narrative | Part a #16 - total number of people was not tracked since several commercial or public buildings were evacuated. 12 buildings were evacuated. A 12 inch end cap blew off the end of a 60 psig steel gas main while resetting the sealing element during a stopple procedure. A temporary compression end cap was installed on the end of the main. As the tapper worked to reset the stopper, gas immediately built up on the temporary compression cap and the pressure caused the cap to blow off the main. When the main was blowing the tapper momentarily was able to re-stop the flow of gas by resetting the stopper but then the sealing element on the stopper partially rolled causing a void of approximately 12 square inches around the sealing element, allowing gas to escape. |
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