Incident details
Operator, cause, commodity and consequences with raw source fields.
GD incident on 2019-03-20 — MT
Operator
Montana - Dakota Utilities Co
Cause
Pipe, Weld, Or Joint Failure
Commodity
Natural Gas
Program
GD
Damage and Injuries
0 fatalities
1 injury
Property damage (nominal)
$11,000
Incident datetime
2019-03-20 17:27
Report number
Location
MT, DAWSON
Narrative
At 16:45 on 3/20/2019 local management was informed by emergency responders that a possible explosion had occurred at 718 river rd, glendive, mt. Technicians were dispatched immediately after notification and upon arrival technicians began to make the scene safe. The technicians confirmed that an explosion had occurred at a private residence resulting in burn injuries to a resident. Gas meter to the home was shut off. A combustible gas indicator was used inside the home, detecting a presence of natural gas. The investigation continued outside with the presence of gas being found in soil. During this investigation a leak was detected on a mechanical nut follower coupling on the 2in steel main which was secured at 04:48 3/21/2019. Follow up investigation proved no indication of leaks on the jurisdictional service line. Additionally, testing of customer owned facilities provided no indication of material leaks. The main had been installed in 1962. No indications of a leak were found in the prior two leak surveys, conducted in 2014 and 2018, respectively. In the absence of another identifiable source, the leaking mechanical fitting on the main may have been a source of fuel for the explosion that occurred. However, an identified path of migration has not been determined for the source of fuel to enter the home. Extreme winter temperature and frost conditions at the mechanical fitting may have affected soil conditions surrounding the fitting along with potential for abnormal contraction/expansion of the fitting and pipe components. A required follow up report #1240787 was submitted as the 48 hour follow up report.
Detailed record list
Occurred At
2019-03-20 17:27:00
Year
2019
Report Received Date
2019-04-19 00:00:00
Iyear
2019.0
Report Number
20190038.0
Supplemental Number
32189.0
Report Type
Supplemental Final
Operator Id
12684
Name
Montana - Dakota Utilities Co
Operator Street Address
400 North Fourth Street
Operator City Name
Bismarck
Operator State Abbreviation
ND
Operator Postal Code
58501
Local Datetime
2019-03-20 16:45:00
Location Street Address
718 River Rd
Location City Name
Glendive
Location County Name
Dawson
Location State Abbreviation
MT
Location Postal Code
59330
Location Latitude
47.093572
Location Longitude
-104.758935
Nrc Rpt Datetime
2019-03-20 17:46:00
Nrc Rpt Num
1240601
Commodity Released Type
Natural Gas
Unintentional Release
0.01
Fatality Ind
No
Fatal
0
Injury Ind
Yes
Num Emp Injuries
0
Num Contr Injuries
0
Num Er Injuries
0
Num Worker Injuries
0
Num Gp Injuries
1
Injure
1
Ignite Ind
Yes
Explode Ind
Yes
Num Pub Evacuated
1.0
Incident Identified Datetime
2019-03-20 17:27:00
On Site Datetime
2019-03-20 17:00:00
Federal
No
Location Type
Private Property
Incident Area Type
Underground
Incident Area Subtype
Under Soil
Depth Of Cover
30.0
Crossing
No
Pipe Facility Type
Investor Owned
System Part Involved
Main
Installation Year
1962.0
Pipe Diameter
2.0
Pipe Specification
Unknown
Pipe Manufacturer
Unknown
Material Involved
Steel
Steel Seam Type
Other
Steel Seam Type Details
Unknown
Wt Steel
0.154
Release Type
Leak
Leak Type
Seal Or Packing
Class Location Type
Class 3 Location
Est Cost Oper Paid
210000.0
Est Cost Prop Damage
11000.0
Est Cost Emergency
18000.0
Est Cost Other
0.0
Est Cost Unintentional Release
1.0
Prpty
239001.0
Commercial Affected
0.0
Industrial Affected
0.0
Residences Affected
2.0
Accident Psig
42.0
Normal Psig
42.0
Mop Psig
50.0
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
Pipe, Weld, Or Joint Failure
Cause Details
Mechanical Joint Failure
Pwjf Failure Type
Mechanical Joint Failure
Mec Fitting Involved
Nut Follower
Mec Fitting Type
Coupling
Mec Manufacturer
Unknown
Mec Fitting Material
Other
Mec Fitting Material Detail
Materials Joined: 1st Steel, 2nd Steel
Additional Other Ind
Yes
Additional Factor Details
Fitting Failure
Result Material Ind
Yes
Result Material Subtype
Other
Result Material Details
Mechanical Nut Follower Fitting
Hydrotest Conducted Ind
No
Preparer Name
J*** S******
Preparer Title
Director Of Ops Policy And Procedure
Preparer Email
J***********@m**.com
Preparer Telephone
701-222-7773
Authorizer Name
J*** S******
Authorizer Title
Director Of Ops Policy And Procedure
Authorizer Telephone
701-222-7773
Authorizer Email
J***********@m**.com
Narrative
At 16:45 on 3/20/2019 local management was informed by emergency responders that a possible explosion had occurred at 718 river rd, glendive, mt. Technicians were dispatched immediately after notification and upon arrival technicians began to make the scene safe. The technicians confirmed that an explosion had occurred at a private residence resulting in burn injuries to a resident. Gas meter to the home was shut off. A combustible gas indicator was used inside the home, detecting a presence of natural gas. The investigation continued outside with the presence of gas being found in soil. During this investigation a leak was detected on a mechanical nut follower coupling on the 2in steel main which was secured at 04:48 3/21/2019. Follow up investigation proved no indication of leaks on the jurisdictional service line. Additionally, testing of customer owned facilities provided no indication of material leaks. The main had been installed in 1962. No indications of a leak were found in the prior two leak surveys, conducted in 2014 and 2018, respectively. In the absence of another identifiable source, the leaking mechanical fitting on the main may have been a source of fuel for the explosion that occurred. However, an identified path of migration has not been determined for the source of fuel to enter the home. Extreme winter temperature and frost conditions at the mechanical fitting may have affected soil conditions surrounding the fitting along with potential for abnormal contraction/expansion of the fitting and pipe components. A required follow up report #1240787 was submitted as the 48 hour follow up report.
| Occurred At | 2019-03-20 17:27:00 |
|---|---|
| Year | 2019 |
| Report Received Date | 2019-04-19 00:00:00 |
| Iyear | 2019.0 |
| Report Number | 20190038.0 |
| Supplemental Number | 32189.0 |
| Report Type | Supplemental Final |
| Operator Id | 12684 PHMSA Enforcement |
| Name | Montana - Dakota Utilities Co |
| Operator Street Address | 400 North Fourth Street |
| Operator City Name | Bismarck |
| Operator State Abbreviation | ND |
| Operator Postal Code | 58501 |
| Local Datetime | 2019-03-20 16:45:00 |
| Location Street Address | 718 River Rd |
| Location City Name | Glendive |
| Location County Name | Dawson |
| Location State Abbreviation | MT |
| Location Postal Code | 59330 |
| Location Latitude | 47.093572 Google Maps OpenStreetMap |
| Location Longitude | -104.758935 Google Maps OpenStreetMap |
| Nrc Rpt Datetime | 2019-03-20 17:46:00 |
| Nrc Rpt Num | 1240601 NRC Report How to search |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 0.01 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | Yes |
| Num Emp Injuries | 0 |
| Num Contr Injuries | 0 |
| Num Er Injuries | 0 |
| Num Worker Injuries | 0 |
| Num Gp Injuries | 1 |
| Injure | 1 |
| Ignite Ind | Yes |
| Explode Ind | Yes |
| Num Pub Evacuated | 1.0 |
| Incident Identified Datetime | 2019-03-20 17:27:00 |
| On Site Datetime | 2019-03-20 17:00:00 |
| Federal | No |
| Location Type | Private Property |
| Incident Area Type | Underground |
| Incident Area Subtype | Under Soil |
| Depth Of Cover | 30.0 |
| Crossing | No |
| Pipe Facility Type | Investor Owned |
| System Part Involved | Main |
| Installation Year | 1962.0 |
| Pipe Diameter | 2.0 |
| Pipe Specification | Unknown |
| Pipe Manufacturer | Unknown |
| Material Involved | Steel |
| Steel Seam Type | Other |
| Steel Seam Type Details | Unknown |
| Wt Steel | 0.154 |
| Release Type | Leak |
| Leak Type | Seal Or Packing |
| Class Location Type | Class 3 Location |
| Est Cost Oper Paid | 210000.0 |
| Est Cost Prop Damage | 11000.0 |
| Est Cost Emergency | 18000.0 |
| Est Cost Other | 0.0 |
| Est Cost Unintentional Release | 1.0 |
| Prpty | 239001.0 |
| Commercial Affected | 0.0 |
| Industrial Affected | 0.0 |
| Residences Affected | 2.0 |
| Accident Psig | 42.0 |
| Normal Psig | 42.0 |
| Mop Psig | 50.0 |
| 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 | Pipe, Weld, Or Joint Failure |
| Cause Details | Mechanical Joint Failure |
| Pwjf Failure Type | Mechanical Joint Failure |
| Mec Fitting Involved | Nut Follower |
| Mec Fitting Type | Coupling |
| Mec Manufacturer | Unknown |
| Mec Fitting Material | Other |
| Mec Fitting Material Detail | Materials Joined: 1st Steel, 2nd Steel |
| Additional Other Ind | Yes |
| Additional Factor Details | Fitting Failure |
| Result Material Ind | Yes |
| Result Material Subtype | Other |
| Result Material Details | Mechanical Nut Follower Fitting |
| Hydrotest Conducted Ind | No |
| Preparer Name | J*** S****** |
| Preparer Title | Director Of Ops Policy And Procedure |
| Preparer Email | J***********@m**.com |
| Preparer Telephone | 701-222-7773 |
| Authorizer Name | J*** S****** |
| Authorizer Title | Director Of Ops Policy And Procedure |
| Authorizer Telephone | 701-222-7773 |
| Authorizer Email | J***********@m**.com |
| Narrative | At 16:45 on 3/20/2019 local management was informed by emergency responders that a possible explosion had occurred at 718 river rd, glendive, mt. Technicians were dispatched immediately after notification and upon arrival technicians began to make the scene safe. The technicians confirmed that an explosion had occurred at a private residence resulting in burn injuries to a resident. Gas meter to the home was shut off. A combustible gas indicator was used inside the home, detecting a presence of natural gas. The investigation continued outside with the presence of gas being found in soil. During this investigation a leak was detected on a mechanical nut follower coupling on the 2in steel main which was secured at 04:48 3/21/2019. Follow up investigation proved no indication of leaks on the jurisdictional service line. Additionally, testing of customer owned facilities provided no indication of material leaks. The main had been installed in 1962. No indications of a leak were found in the prior two leak surveys, conducted in 2014 and 2018, respectively. In the absence of another identifiable source, the leaking mechanical fitting on the main may have been a source of fuel for the explosion that occurred. However, an identified path of migration has not been determined for the source of fuel to enter the home. Extreme winter temperature and frost conditions at the mechanical fitting may have affected soil conditions surrounding the fitting along with potential for abnormal contraction/expansion of the fitting and pipe components. A required follow up report #1240787 was submitted as the 48 hour follow up report. |
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