Incident details
Operator, cause, commodity and consequences with raw source fields.
GD incident on 2018-01-08 — TN
Operator
Middle Tennessee Natural Gas Util Dist
Cause
Miscellaneous Root Causes
Commodity
Natural Gas
Program
GD
Damage and Injuries
0 fatalities
1 injury
Property damage (nominal)
$2,500
Incident datetime
2018-01-08 20:34
Report number
Location
TN, CUMBERLAND
Narrative
On january 8, 2018, fire consumed a personal residence located at 266 roma drive, crossville, tennessee. An explosion was reported in conjunction with the fire. There were three (3) occupants in the home at the time of the incident. One occupant received injuries requiring hospitalization. At approximately 8:34 p.M. (cst), middle tennessee natural gas utility district (mtngud) received a report of a fire and explosion at 266 roma drive, crossville, tennessee. At approximately 8:40 p.M. (cst) two mtngud service technicians arrived at the scene. The fire department and other emergency service providers were on the scene. The house was in flames. At approximately at 8:45 p.M. (cst), the service technicians cut and capped the three-quarter inch (3/4") p.E. Service line approximately thirty (30) feet from the house. A remote methane leak detection survey was performed to determine the presence of natural gas. The survey detected a slight reading which dissipated following the capping of the service line. Before the service technicians left the scene they removed the gas meter and regulator which were damaged beyond use in this incident. Mtngud technicians did not investigate any pipe downstream of the gas meter. On january 9, 2018, mtngud personnel conducted an odorant test near the incident site. The odorant was in an acceptable range. On january 11, 2018, an air test on the service line indicated a failure of the service line. Excavation under a concrete slab led to discovery of a service line repair by use of a compression coupling. This repair location was directly underneath a four-inch pvc drain pipe. One end of the service line was disconnected from the coupling. It is unknown if this disconnection occurred before or during the explosion. Further investigation revealed two (2) additional damaged areas on the service line. In 2006, an excavator hit and cut the line. This damage had been repaired by use of a stab fitting. This repair was intact. The sight of a crossing of the service line with a cable tv line revealed that the service line had been struck and pulled with force leaving marks and distortion on the line. The line remained serviceable at this damage location. An mtngud service technician was onsite at this meter on 12/5/17 for a regular annual pressure confirmation and there were no indications of irregularities or abnormal operating conditions at that time. Weather in crossville, tennessee, prior to this incident was unusually cold with freezing and thawing of the ground in the vicinity, which may have contributed to the coupling to service line failure. Previous excavation damage may also have compromised the integrity of this connection. The separation of the coupling from the service line was so complete, it raises issues of the time and cause of the separation.
Detailed record list
Occurred At
2018-01-08 20:34:00
Year
2018
Report Received Date
2018-02-05 00:00:00
Iyear
2018.0
Report Number
20180018.0
Supplemental Number
31005.0
Report Type
Supplemental
Operator Id
12438
Name
Middle Tennessee Natural Gas Util Dist
Operator Street Address
P.o. Box 670, 1030 West Broad St
Operator City Name
Smithville
Operator State Abbreviation
TN
Operator Postal Code
37166
Local Datetime
2018-01-08 20:25:00
Location Street Address
266 Roma Drive
Location City Name
Crossville
Location County Name
Cumberland
Location State Abbreviation
TN
Location Postal Code
38555
Location Latitude
35.9194
Location Longitude
-85.039
Nrc Rpt Datetime
2018-01-08 21:25:00
Nrc Rpt Num
1201373
Commodity Released Type
Natural Gas
Unintentional Release
2.86
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
3.0
Incident Identified Datetime
2018-01-08 20:34:00
On Site Datetime
2018-01-08 20:40:00
Federal
No
Location Type
Private Property
Incident Area Type
Underground
Incident Area Subtype
Under Pavement
Depth Of Cover
30.0
Crossing
No
Pipe Facility Type
Municipally Owned
System Part Involved
Service
Installation Year
1976.0
Pipe Diameter
0.75
Pipe Specification
Astm D2513
Pipe Manufacturer
Unknown
Material Involved
Plastic
Plastic Type
Polyethylene (Pe)
Plastic Sdr
11
Material Pe Pipe Code
Unknown
Release Type
Leak
Leak Type
Connection Failure
Class Location Type
Class 2 Location
Est Cost Oper Paid
200000.0
Est Cost Prop Damage
2500.0
Est Cost Emergency
6500.0
Est Cost Other
0.0
Est Cost Unintentional Release
17.0
Prpty
209017.0
Commercial Affected
0.0
Industrial Affected
0.0
Residences Affected
1.0
Accident Psig
50.0
Normal Psig
50.0
Mop Psig
60.0
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
Excavation Damage
Cause Details
Previous Damage Due To Excavation Activity
Ex Party Type
Previous Damage Due To Excavation Activity
Ex Hydrotest Leak Survey Date
2016-09-29 00:00:00
Ex Hydrotest Conducted Ind
No
Notify Cga Dirt
No
Private Row Ind
Yes
Private Subtype
Private Landowner
Excavator Type
Unknown/other
Excavator Equipment
Unknown/other
Work Performed
Drainage
One Call Notified Ind
No
Service Interruption
Data Not Collected
Root Cause Category
Miscellaneous Root Causes
Root Cause Type
Previous Damage
Preparer Name
M*** S*******
Preparer Title
Vice President - Engineering
Preparer Email
M********@m***.com
Preparer Telephone
615-597-0515
Preparer Fax
615-597-6331
Authorizer Name
J**** E* H*****
Authorizer Title
Executive Vice President And C.e.o.
Authorizer Telephone
615-597-4300
Authorizer Email
J******@m***.com
Narrative
On january 8, 2018, fire consumed a personal residence located at 266 roma drive, crossville, tennessee. An explosion was reported in conjunction with the fire. There were three (3) occupants in the home at the time of the incident. One occupant received injuries requiring hospitalization. At approximately 8:34 p.M. (cst), middle tennessee natural gas utility district (mtngud) received a report of a fire and explosion at 266 roma drive, crossville, tennessee. At approximately 8:40 p.M. (cst) two mtngud service technicians arrived at the scene. The fire department and other emergency service providers were on the scene. The house was in flames. At approximately at 8:45 p.M. (cst), the service technicians cut and capped the three-quarter inch (3/4") p.E. Service line approximately thirty (30) feet from the house. A remote methane leak detection survey was performed to determine the presence of natural gas. The survey detected a slight reading which dissipated following the capping of the service line. Before the service technicians left the scene they removed the gas meter and regulator which were damaged beyond use in this incident. Mtngud technicians did not investigate any pipe downstream of the gas meter. On january 9, 2018, mtngud personnel conducted an odorant test near the incident site. The odorant was in an acceptable range. On january 11, 2018, an air test on the service line indicated a failure of the service line. Excavation under a concrete slab led to discovery of a service line repair by use of a compression coupling. This repair location was directly underneath a four-inch pvc drain pipe. One end of the service line was disconnected from the coupling. It is unknown if this disconnection occurred before or during the explosion. Further investigation revealed two (2) additional damaged areas on the service line. In 2006, an excavator hit and cut the line. This damage had been repaired by use of a stab fitting. This repair was intact. The sight of a crossing of the service line with a cable tv line revealed that the service line had been struck and pulled with force leaving marks and distortion on the line. The line remained serviceable at this damage location. An mtngud service technician was onsite at this meter on 12/5/17 for a regular annual pressure confirmation and there were no indications of irregularities or abnormal operating conditions at that time. Weather in crossville, tennessee, prior to this incident was unusually cold with freezing and thawing of the ground in the vicinity, which may have contributed to the coupling to service line failure. Previous excavation damage may also have compromised the integrity of this connection. The separation of the coupling from the service line was so complete, it raises issues of the time and cause of the separation.
| Occurred At | 2018-01-08 20:34:00 |
|---|---|
| Year | 2018 |
| Report Received Date | 2018-02-05 00:00:00 |
| Iyear | 2018.0 |
| Report Number | 20180018.0 |
| Supplemental Number | 31005.0 |
| Report Type | Supplemental |
| Operator Id | 12438 PHMSA Enforcement |
| Name | Middle Tennessee Natural Gas Util Dist |
| Operator Street Address | P.o. Box 670, 1030 West Broad St |
| Operator City Name | Smithville |
| Operator State Abbreviation | TN |
| Operator Postal Code | 37166 |
| Local Datetime | 2018-01-08 20:25:00 |
| Location Street Address | 266 Roma Drive |
| Location City Name | Crossville |
| Location County Name | Cumberland |
| Location State Abbreviation | TN |
| Location Postal Code | 38555 |
| Location Latitude | 35.9194 Google Maps OpenStreetMap |
| Location Longitude | -85.039 Google Maps OpenStreetMap |
| Nrc Rpt Datetime | 2018-01-08 21:25:00 |
| Nrc Rpt Num | 1201373 NRC Report How to search |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 2.86 |
| 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 | 3.0 |
| Incident Identified Datetime | 2018-01-08 20:34:00 |
| On Site Datetime | 2018-01-08 20:40:00 |
| Federal | No |
| Location Type | Private Property |
| Incident Area Type | Underground |
| Incident Area Subtype | Under Pavement |
| Depth Of Cover | 30.0 |
| Crossing | No |
| Pipe Facility Type | Municipally Owned |
| System Part Involved | Service |
| Installation Year | 1976.0 |
| Pipe Diameter | 0.75 |
| Pipe Specification | Astm D2513 |
| Pipe Manufacturer | Unknown |
| Material Involved | Plastic |
| Plastic Type | Polyethylene (Pe) |
| Plastic Sdr | 11 |
| Material Pe Pipe Code | Unknown |
| Release Type | Leak |
| Leak Type | Connection Failure |
| Class Location Type | Class 2 Location |
| Est Cost Oper Paid | 200000.0 |
| Est Cost Prop Damage | 2500.0 |
| Est Cost Emergency | 6500.0 |
| Est Cost Other | 0.0 |
| Est Cost Unintentional Release | 17.0 |
| Prpty | 209017.0 |
| Commercial Affected | 0.0 |
| Industrial Affected | 0.0 |
| Residences Affected | 1.0 |
| Accident Psig | 50.0 |
| Normal Psig | 50.0 |
| Mop Psig | 60.0 |
| 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 | Excavation Damage |
| Cause Details | Previous Damage Due To Excavation Activity |
| Ex Party Type | Previous Damage Due To Excavation Activity |
| Ex Hydrotest Leak Survey Date | 2016-09-29 00:00:00 |
| Ex Hydrotest Conducted Ind | No |
| Notify Cga Dirt | No |
| Private Row Ind | Yes |
| Private Subtype | Private Landowner |
| Excavator Type | Unknown/other |
| Excavator Equipment | Unknown/other |
| Work Performed | Drainage |
| One Call Notified Ind | No |
| Service Interruption | Data Not Collected |
| Root Cause Category | Miscellaneous Root Causes |
| Root Cause Type | Previous Damage |
| Preparer Name | M*** S******* |
| Preparer Title | Vice President - Engineering |
| Preparer Email | M********@m***.com |
| Preparer Telephone | 615-597-0515 |
| Preparer Fax | 615-597-6331 |
| Authorizer Name | J**** E* H***** |
| Authorizer Title | Executive Vice President And C.e.o. |
| Authorizer Telephone | 615-597-4300 |
| Authorizer Email | J******@m***.com |
| Narrative | On january 8, 2018, fire consumed a personal residence located at 266 roma drive, crossville, tennessee. An explosion was reported in conjunction with the fire. There were three (3) occupants in the home at the time of the incident. One occupant received injuries requiring hospitalization. At approximately 8:34 p.M. (cst), middle tennessee natural gas utility district (mtngud) received a report of a fire and explosion at 266 roma drive, crossville, tennessee. At approximately 8:40 p.M. (cst) two mtngud service technicians arrived at the scene. The fire department and other emergency service providers were on the scene. The house was in flames. At approximately at 8:45 p.M. (cst), the service technicians cut and capped the three-quarter inch (3/4") p.E. Service line approximately thirty (30) feet from the house. A remote methane leak detection survey was performed to determine the presence of natural gas. The survey detected a slight reading which dissipated following the capping of the service line. Before the service technicians left the scene they removed the gas meter and regulator which were damaged beyond use in this incident. Mtngud technicians did not investigate any pipe downstream of the gas meter. On january 9, 2018, mtngud personnel conducted an odorant test near the incident site. The odorant was in an acceptable range. On january 11, 2018, an air test on the service line indicated a failure of the service line. Excavation under a concrete slab led to discovery of a service line repair by use of a compression coupling. This repair location was directly underneath a four-inch pvc drain pipe. One end of the service line was disconnected from the coupling. It is unknown if this disconnection occurred before or during the explosion. Further investigation revealed two (2) additional damaged areas on the service line. In 2006, an excavator hit and cut the line. This damage had been repaired by use of a stab fitting. This repair was intact. The sight of a crossing of the service line with a cable tv line revealed that the service line had been struck and pulled with force leaving marks and distortion on the line. The line remained serviceable at this damage location. An mtngud service technician was onsite at this meter on 12/5/17 for a regular annual pressure confirmation and there were no indications of irregularities or abnormal operating conditions at that time. Weather in crossville, tennessee, prior to this incident was unusually cold with freezing and thawing of the ground in the vicinity, which may have contributed to the coupling to service line failure. Previous excavation damage may also have compromised the integrity of this connection. The separation of the coupling from the service line was so complete, it raises issues of the time and cause of the separation. |
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