Incident details
Operator, cause, commodity and consequences with raw source fields.
GD incident on 2015-03-13 — MN
Operator
Great Plains Natural Gas Co
Cause
Equipment Failure
Commodity
Natural Gas
Program
GD
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$1,500
Incident datetime
2015-03-13 03:23
Report number
Location
MN, OTTER TAIL
Narrative
This service line had been installed since 1971. No indications of a leak were found in the prior two leak surveys, conducted in 2008 & 2012 respectively. Day time high temperatures the week of the 13th of march, 2015 were abnormally warm (almost 20 degrees above normal). Thus, it is highly likely that the ground was beginning to thaw. The leak investigation indicated that there was a leak at the riser. After excavating the, 3/4" continental ,riser and completing further testing a leak was found at the nut follower/compression connection between the riser and the pvc service line. An inside leak on non-jurisdictional piping was also identified during the leak investigation. In the absence of any other identifiable source, the riser leak may be the source of fuel for the explosion that occurred, however a migration path for the gas to enter the premise was not identified.
Detailed record list
Occurred At
2015-03-13 03:23:00
Year
2015
Report Received Date
2015-04-08 00:00:00
Iyear
2015.0
Report Number
20150037.0
Supplemental Number
16178.0
Report Type
Supplemental Final
Operator Id
6690
Name
Great Plains Natural Gas Co
Operator Street Address
400 North Fourth Street
Operator City Name
Bismarck
Operator State Abbreviation
ND
Operator Postal Code
58501
Local Datetime
2015-03-13 03:17:00
Location Street Address
1903 Pebble Lake Road
Location City Name
Fergus Falls
Location County Name
Otter Tail
Location State Abbreviation
MN
Location Postal Code
56537
Location Latitude
46.26445
Location Longitude
-96.05534
Nrc Rpt Datetime
2015-03-13 07:25:00
Nrc Rpt Num
1110499
Commodity Released Type
Natural Gas
Unintentional Release
0.0
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Ignite Ind
Yes
Explode Ind
Yes
Num Pub Evacuated
4.0
Incident Identified Datetime
2015-03-13 03:23:00
On Site Datetime
2015-03-13 03:36:00
Federal
No
Location Type
Private Property
Incident Area Type
Underground
Incident Area Subtype
Under Soil
Depth Of Cover
20.0
Crossing
No
Pipe Facility Type
Investor Owned
System Part Involved
Service Riser
Installation Year
1971.0
Material Involved
Steel
Release Type
Leak
Leak Type
Connection Failure
Class Location Type
Class 3 Location
Est Cost Oper Paid
75000.0
Est Cost Prop Damage
1500.0
Est Cost Emergency
2500.0
Est Cost Other
0.0
Est Cost Unintentional Release
0.0
Prpty
79000.0
Commercial Affected
0.0
Industrial Affected
0.0
Residences Affected
1.0
Accident Psig
15.0
Normal Psig
15.0
Mop Psig
33.0
Accident Pressure
Pressure Did Not Exceed Maop
Scada In Place Ind
No
Accident Identifier
Notification From Emergency Responder
Investigation Status
No, the facility was not monitored by a controller(s) at the time of the incident
Employee Drug Test Ind
No
Contractor Drug Test Ind
No
Cause
Equipment Failure
Cause Details
Threaded Connection Failure
Eq Failure Type
Threaded Connection Failure
Other Stripped Ind
Other
Other Stripped Details
A Nut Follower/compression Fitting At The Bottom Of The Riser Connecting To The Pvc Service Line Was Found To Be Leaking During The Leak Investigation Of The Incident. What Caused The Leak To Occur Is Unknown.
Preparer Name
M*** K***********
Preparer Title
Staff Engineer
Preparer Email
M****************@m**.com
Preparer Telephone
701.222.7973
Authorizer Name
D**** A*******
Authorizer Title
Director Of Distribution
Authorizer Telephone
701.222.7994
Authorizer Email
D*************@m**.com
Narrative
This service line had been installed since 1971. No indications of a leak were found in the prior two leak surveys, conducted in 2008 & 2012 respectively. Day time high temperatures the week of the 13th of march, 2015 were abnormally warm (almost 20 degrees above normal). Thus, it is highly likely that the ground was beginning to thaw. The leak investigation indicated that there was a leak at the riser. After excavating the, 3/4" continental ,riser and completing further testing a leak was found at the nut follower/compression connection between the riser and the pvc service line. An inside leak on non-jurisdictional piping was also identified during the leak investigation. In the absence of any other identifiable source, the riser leak may be the source of fuel for the explosion that occurred, however a migration path for the gas to enter the premise was not identified.
| Occurred At | 2015-03-13 03:23:00 |
|---|---|
| Year | 2015 |
| Report Received Date | 2015-04-08 00:00:00 |
| Iyear | 2015.0 |
| Report Number | 20150037.0 |
| Supplemental Number | 16178.0 |
| Report Type | Supplemental Final |
| Operator Id | 6690 PHMSA Enforcement |
| Name | Great Plains Natural Gas Co |
| Operator Street Address | 400 North Fourth Street |
| Operator City Name | Bismarck |
| Operator State Abbreviation | ND |
| Operator Postal Code | 58501 |
| Local Datetime | 2015-03-13 03:17:00 |
| Location Street Address | 1903 Pebble Lake Road |
| Location City Name | Fergus Falls |
| Location County Name | Otter Tail |
| Location State Abbreviation | MN |
| Location Postal Code | 56537 |
| Location Latitude | 46.26445 Google Maps OpenStreetMap |
| Location Longitude | -96.05534 Google Maps OpenStreetMap |
| Nrc Rpt Datetime | 2015-03-13 07:25:00 |
| Nrc Rpt Num | 1110499 NRC Report How to search |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 0.0 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Ignite Ind | Yes |
| Explode Ind | Yes |
| Num Pub Evacuated | 4.0 |
| Incident Identified Datetime | 2015-03-13 03:23:00 |
| On Site Datetime | 2015-03-13 03:36:00 |
| Federal | No |
| Location Type | Private Property |
| Incident Area Type | Underground |
| Incident Area Subtype | Under Soil |
| Depth Of Cover | 20.0 |
| Crossing | No |
| Pipe Facility Type | Investor Owned |
| System Part Involved | Service Riser |
| Installation Year | 1971.0 |
| Material Involved | Steel |
| Release Type | Leak |
| Leak Type | Connection Failure |
| Class Location Type | Class 3 Location |
| Est Cost Oper Paid | 75000.0 |
| Est Cost Prop Damage | 1500.0 |
| Est Cost Emergency | 2500.0 |
| Est Cost Other | 0.0 |
| Est Cost Unintentional Release | 0.0 |
| Prpty | 79000.0 |
| Commercial Affected | 0.0 |
| Industrial Affected | 0.0 |
| Residences Affected | 1.0 |
| Accident Psig | 15.0 |
| Normal Psig | 15.0 |
| Mop Psig | 33.0 |
| Accident Pressure | Pressure Did Not Exceed Maop |
| Scada In Place Ind | No |
| Accident Identifier | Notification From Emergency Responder |
| Investigation Status | No, the facility was not monitored by a controller(s) at the time of the incident |
| Employee Drug Test Ind | No |
| Contractor Drug Test Ind | No |
| Cause | Equipment Failure |
| Cause Details | Threaded Connection Failure |
| Eq Failure Type | Threaded Connection Failure |
| Other Stripped Ind | Other |
| Other Stripped Details | A Nut Follower/compression Fitting At The Bottom Of The Riser Connecting To The Pvc Service Line Was Found To Be Leaking During The Leak Investigation Of The Incident. What Caused The Leak To Occur Is Unknown. |
| Preparer Name | M*** K*********** |
| Preparer Title | Staff Engineer |
| Preparer Email | M****************@m**.com |
| Preparer Telephone | 701.222.7973 |
| Authorizer Name | D**** A******* |
| Authorizer Title | Director Of Distribution |
| Authorizer Telephone | 701.222.7994 |
| Authorizer Email | D*************@m**.com |
| Narrative | This service line had been installed since 1971. No indications of a leak were found in the prior two leak surveys, conducted in 2008 & 2012 respectively. Day time high temperatures the week of the 13th of march, 2015 were abnormally warm (almost 20 degrees above normal). Thus, it is highly likely that the ground was beginning to thaw. The leak investigation indicated that there was a leak at the riser. After excavating the, 3/4" continental ,riser and completing further testing a leak was found at the nut follower/compression connection between the riser and the pvc service line. An inside leak on non-jurisdictional piping was also identified during the leak investigation. In the absence of any other identifiable source, the riser leak may be the source of fuel for the explosion that occurred, however a migration path for the gas to enter the premise was not identified. |
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