Incident details
Operator, cause, commodity and consequences with raw source fields.
GD incident on 2018-09-20 — NV
Operator
Southwest Gas Corp
Cause
Natural Force Damage
Commodity
Natural Gas
Program
GD
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$105
Incident datetime
2018-09-20 09:40
Report number
Location
NV, CLARK COUNTY
Narrative
While conducting a special leak patrol on m7000/8000 pipe, a company contractor from heath consultants discovered a hazardous grade 1 leak on a 2-inch m8000 pipe at the 2"x1" continental tapping saddle near the intersection of buckskin avenue and shady timber street in las vegas, nevada. The flow of gas to the section of pipe was taken out of service while repairs were completed which resulted in a service outage of 1,722 customers. G2 - natural force damage: the company completed it's investigation into the failure and determined the apparent cause of the leak to be "natural force damage", with a sub-cause of "temperature - thermal stress". The tapped hole in the pipe was axially displaced approximately one inch with respect to the tapping tee's original position. The movement of the pipe, likely due to thermal contraction, resulted in the displacement of the saddle-to-pipe o-ring, breaking the gas-tight seal resulting in a leak. Based on communications that the public utilites commission of nevada's regulatory operations staff had with the pipeline and hazardous materials safety administration's accident investigation division, part a, 4 "local time and date of the incident" reflects the time operator personnel identified and reported a grade 1 leak on the pipeline. At the time, no incident reporting criteria was met. The shutdown time reported in part a, 13a (11:23 pdt) is the earliest date and time a reporting criteria was met. Due to the shutdown of the pipeline, the incident was estimated to reach property damage of $50,000 or more. Telephonic notifications were made within one hour of the shutdown time. Part a, 6: southwest gas notified the national response center (nrc) telephonically of the incident on september 20, 2018 at 11:43 pdt. The nrc issued report number 1225212 for the incident. Southwest gas provided a 48-hour update telephonically to the nrc on september 21, 2018 at 15:48 pdt. The nrc issued report number 1225343 for the updated report.
Detailed record list
Occurred At
2018-09-20 09:40:00
Year
2018
Report Received Date
2018-10-18 00:00:00
Iyear
2018.0
Report Number
20180096.0
Supplemental Number
31091.0
Report Type
Original Final
Operator Id
18536
Name
Southwest Gas Corp
Operator Street Address
5241 Spring Mountain Road
Operator City Name
Las Vegas
Operator State Abbreviation
NV
Operator Postal Code
89103
Local Datetime
2018-09-20 09:40:00
Location Street Address
Buckskin Avenue And Shady Timber Street
Location City Name
Las Vegas
Location County Name
Clark County
Location State Abbreviation
NV
Location Postal Code
89129
Location Latitude
36.22191
Location Longitude
-115.32369
Nrc Rpt Datetime
2018-09-20 11:43:00
Nrc Rpt Num
1225212
Commodity Released Type
Natural Gas
Unintentional Release
9.0
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Ignite Ind
No
Explode Ind
No
Num Pub Evacuated
11.0
Incident Identified Datetime
2018-09-20 09:40:00
On Site Datetime
2018-09-20 09:40:00
Federal
No
Location Type
Public Property
Incident Area Type
Underground
Incident Area Subtype
Under Pavement
Depth Of Cover
96.0
Crossing
No
Pipe Facility Type
Investor Owned
System Part Involved
Main
Installation Year
1998.0
Pipe Diameter
2.0
Pipe Specification
Astm D2513
Pipe Manufacturer
Phillips
Material Involved
Plastic
Plastic Type
Polyethylene (Pe)
Plastic Sdr
11
Material Pe Pipe Code
3408
Release Type
Leak
Leak Type
Seal Or Packing
Class Location Type
Class 3 Location
Est Cost Oper Paid
400.0
Est Cost Prop Damage
105.0
Est Cost Emergency
120603.0
Est Cost Other
0.0
Est Cost Unintentional Release
20.0
Prpty
121128.0
Commercial Affected
48.0
Industrial Affected
0.0
Residences Affected
1674.0
Accident Psig
55.0
Normal Psig
55.0
Mop Psig
60.0
Accident Pressure
Pressure Did Not Exceed Maop
Scada In Place Ind
No
Accident Identifier
Local Operating Personnel, Including Contractors
Operator Type
Contractor Working For The Operator
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
Natural Force Damage
Cause Details
Temperature
Natural Force Type
Temperature
Temperature Subtype
Thermal Stress
Nf Extreme Weather Ind
No
Preparer Name
Y***** B******
Preparer Title
Specialist Division Complaince
Preparer Email
Y*************@s****.com
Preparer Telephone
702-365-2149
Preparer Fax
702-365-2205
Authorizer Name
A****** H****
Authorizer Title
Director Of Gas Operations
Authorizer Telephone
702-365-2049
Authorizer Email
A************@s*****.com
Narrative
While conducting a special leak patrol on m7000/8000 pipe, a company contractor from heath consultants discovered a hazardous grade 1 leak on a 2-inch m8000 pipe at the 2"x1" continental tapping saddle near the intersection of buckskin avenue and shady timber street in las vegas, nevada. The flow of gas to the section of pipe was taken out of service while repairs were completed which resulted in a service outage of 1,722 customers. G2 - natural force damage: the company completed it's investigation into the failure and determined the apparent cause of the leak to be "natural force damage", with a sub-cause of "temperature - thermal stress". The tapped hole in the pipe was axially displaced approximately one inch with respect to the tapping tee's original position. The movement of the pipe, likely due to thermal contraction, resulted in the displacement of the saddle-to-pipe o-ring, breaking the gas-tight seal resulting in a leak. Based on communications that the public utilites commission of nevada's regulatory operations staff had with the pipeline and hazardous materials safety administration's accident investigation division, part a, 4 "local time and date of the incident" reflects the time operator personnel identified and reported a grade 1 leak on the pipeline. At the time, no incident reporting criteria was met. The shutdown time reported in part a, 13a (11:23 pdt) is the earliest date and time a reporting criteria was met. Due to the shutdown of the pipeline, the incident was estimated to reach property damage of $50,000 or more. Telephonic notifications were made within one hour of the shutdown time. Part a, 6: southwest gas notified the national response center (nrc) telephonically of the incident on september 20, 2018 at 11:43 pdt. The nrc issued report number 1225212 for the incident. Southwest gas provided a 48-hour update telephonically to the nrc on september 21, 2018 at 15:48 pdt. The nrc issued report number 1225343 for the updated report.
| Occurred At | 2018-09-20 09:40:00 |
|---|---|
| Year | 2018 |
| Report Received Date | 2018-10-18 00:00:00 |
| Iyear | 2018.0 |
| Report Number | 20180096.0 |
| Supplemental Number | 31091.0 |
| Report Type | Original Final |
| Operator Id | 18536 PHMSA Enforcement |
| Name | Southwest Gas Corp |
| Operator Street Address | 5241 Spring Mountain Road |
| Operator City Name | Las Vegas |
| Operator State Abbreviation | NV |
| Operator Postal Code | 89103 |
| Local Datetime | 2018-09-20 09:40:00 |
| Location Street Address | Buckskin Avenue And Shady Timber Street |
| Location City Name | Las Vegas |
| Location County Name | Clark County |
| Location State Abbreviation | NV |
| Location Postal Code | 89129 |
| Location Latitude | 36.22191 Google Maps OpenStreetMap |
| Location Longitude | -115.32369 Google Maps OpenStreetMap |
| Nrc Rpt Datetime | 2018-09-20 11:43:00 |
| Nrc Rpt Num | 1225212 NRC Report How to search |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 9.0 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Ignite Ind | No |
| Explode Ind | No |
| Num Pub Evacuated | 11.0 |
| Incident Identified Datetime | 2018-09-20 09:40:00 |
| On Site Datetime | 2018-09-20 09:40:00 |
| Federal | No |
| Location Type | Public Property |
| Incident Area Type | Underground |
| Incident Area Subtype | Under Pavement |
| Depth Of Cover | 96.0 |
| Crossing | No |
| Pipe Facility Type | Investor Owned |
| System Part Involved | Main |
| Installation Year | 1998.0 |
| Pipe Diameter | 2.0 |
| Pipe Specification | Astm D2513 |
| Pipe Manufacturer | Phillips |
| Material Involved | Plastic |
| Plastic Type | Polyethylene (Pe) |
| Plastic Sdr | 11 |
| Material Pe Pipe Code | 3408 |
| Release Type | Leak |
| Leak Type | Seal Or Packing |
| Class Location Type | Class 3 Location |
| Est Cost Oper Paid | 400.0 |
| Est Cost Prop Damage | 105.0 |
| Est Cost Emergency | 120603.0 |
| Est Cost Other | 0.0 |
| Est Cost Unintentional Release | 20.0 |
| Prpty | 121128.0 |
| Commercial Affected | 48.0 |
| Industrial Affected | 0.0 |
| Residences Affected | 1674.0 |
| Accident Psig | 55.0 |
| Normal Psig | 55.0 |
| Mop Psig | 60.0 |
| Accident Pressure | Pressure Did Not Exceed Maop |
| Scada In Place Ind | No |
| Accident Identifier | Local Operating Personnel, Including Contractors |
| Operator Type | Contractor Working For The Operator |
| 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 | Natural Force Damage |
| Cause Details | Temperature |
| Natural Force Type | Temperature |
| Temperature Subtype | Thermal Stress |
| Nf Extreme Weather Ind | No |
| Preparer Name | Y***** B****** |
| Preparer Title | Specialist Division Complaince |
| Preparer Email | Y*************@s****.com |
| Preparer Telephone | 702-365-2149 |
| Preparer Fax | 702-365-2205 |
| Authorizer Name | A****** H**** |
| Authorizer Title | Director Of Gas Operations |
| Authorizer Telephone | 702-365-2049 |
| Authorizer Email | A************@s*****.com |
| Narrative | While conducting a special leak patrol on m7000/8000 pipe, a company contractor from heath consultants discovered a hazardous grade 1 leak on a 2-inch m8000 pipe at the 2"x1" continental tapping saddle near the intersection of buckskin avenue and shady timber street in las vegas, nevada. The flow of gas to the section of pipe was taken out of service while repairs were completed which resulted in a service outage of 1,722 customers. G2 - natural force damage: the company completed it's investigation into the failure and determined the apparent cause of the leak to be "natural force damage", with a sub-cause of "temperature - thermal stress". The tapped hole in the pipe was axially displaced approximately one inch with respect to the tapping tee's original position. The movement of the pipe, likely due to thermal contraction, resulted in the displacement of the saddle-to-pipe o-ring, breaking the gas-tight seal resulting in a leak. Based on communications that the public utilites commission of nevada's regulatory operations staff had with the pipeline and hazardous materials safety administration's accident investigation division, part a, 4 "local time and date of the incident" reflects the time operator personnel identified and reported a grade 1 leak on the pipeline. At the time, no incident reporting criteria was met. The shutdown time reported in part a, 13a (11:23 pdt) is the earliest date and time a reporting criteria was met. Due to the shutdown of the pipeline, the incident was estimated to reach property damage of $50,000 or more. Telephonic notifications were made within one hour of the shutdown time. Part a, 6: southwest gas notified the national response center (nrc) telephonically of the incident on september 20, 2018 at 11:43 pdt. The nrc issued report number 1225212 for the incident. Southwest gas provided a 48-hour update telephonically to the nrc on september 21, 2018 at 15:48 pdt. The nrc issued report number 1225343 for the updated report. |
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