Incident details
Operator, cause, commodity and consequences with raw source fields.
GD incident on 2020-06-24 — NV
Operator
Southwest Gas Corp
Cause
Other Outside Force Damage
Commodity
Natural Gas
Program
GD
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$6,000
Incident datetime
2020-06-24 09:04
Report number
Location
NV, CLARK
Narrative
While conducting an annual pvc leak survey pursuant to southwest gas' dimp plan on june 24, 2020, southwest gas' leak survey contractor contacted southwest gas at 09:04 pdt and reported gas reads of 1 lel near the laundry room riser and zero reads inside the laundry room located at 4337 silver dollar avenue in las vegas, nv. Southwest gas crews arrived at 09:35 pdt and obtained gas reads of 4 lel by the riser to the laundry facility, turned off the meter, confirmed zero gas reads inside the unoccupied building, and conducted further leak investigation. At 10:13 pdt, ignition of fugitive natural gas occurred within the detached, unoccupied laundry facility structure resulting in a fire and property damage. Post ignition leak survey results discovered increasing gas readings and leak spread resulting in an evacuation of 14 people from some units of the adjacent, separate apartment building. A leak on a pvc service line coupling connection fitting was revealed during a leak test of the pvc service during a post incident investigation. Additionally, a leak test performed on the customer's houseline failed during the post incident investigation. Part a4: based on communications that the public utilities commission of nevada's regulatory operations staff had with the pipeline and hazardous materials safety administration's accident investigation division, "local time and date of the incident" reflects the time southwest gas was notified of a leak on the pipeline. At that time, no incident reporting criteria was met. Part a6: southwest gas notified the national response center (nrc) telephonically of the incident on june 24, 2020 at 14:33 pdt. The nrc issued report number 1280311 for the incident. Southwest gas provided a 48-hour update telephonically to the nrc on june 25, 2020 at 15:28 pdt. The nrc issued report number 1280402 for the updated report. Supplemental response: changed part g to update the apparent cause from part g5 to g8. The cause of the leak remains under investigation. Current evidence suggests the cause may be g3, g4, or g5. The sample has been sent to a third-party materials testing laboratory for analysis and the results of the analysis will be provided in a supplemental response. The leak was originally believed to be due to a solvent cement joint, but a crack was found when assessed in southwest gas's materials testing laboratory. The crack appears to be a circumferential crack in the pipe near the location of the pipe to coupling joint. Supplemental response 2: following the incident, the service line was disconnected at the main. On march 30, 2021, the service to the customer was replaced. Part c, 3 and 4 - changed the pipe size and wall thickness to 0.5-inch and 0.109-inch respectively based on 3rd party laboratory analysis. Changed part g from g8 - other incident cause to g4 - other outside force damage, with a sub-cause as other outside force damage. An independent laboratory's material investigation concluded that the root cause of the failure was sustained external bending loads leading to slow crack growth and creep rupture. The field investigation determined that the probable cause of the bending loads was a customer houseline water leak which eroded the support from under the service line's transition fitting.
Detailed record list
Occurred At
2020-06-24 09:04:00
Year
2020
Report Received Date
2020-07-24 00:00:00
Iyear
2020.0
Report Number
20200066.0
Supplemental Number
35216.0
Report Type
Supplemental Final
Operator Id
18536
Name
Southwest Gas Corp
Operator Street Address
8360 S. Durango Drive
Operator City Name
Las Vegas
Operator State Abbreviation
NV
Operator Postal Code
89113
Local Datetime
2020-06-24 09:04:00
Time Zone
Mountain
Daylight Savings Ind
Yes
Location Street Address
4337 Silver Dollar Avenue
Location City Name
Las Vegas
Location County Name
Clark
Location State Abbreviation
NV
Location Postal Code
89102
Location Latitude
36.13821
Location Longitude
-115.19848
Flow Cont Other Ind
Yes
Flow Cont Other Detail
Closed Fitting At Main-To-Service Connection
Nrc Rpt Datetime
2020-06-24 14:33:00
Nrc Rpt Num
1280311
Additional Nrc Report Numbers
1280402
Commodity Released Type
Natural Gas
Unintentional Release
1.0
Intentional Release
0.0
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Ignite Ind
Yes
Ignite Datetime
2020-06-24 10:13:00
How Extinguished
Local/state/federal Emergency Responder
Gas Consumed By Fire In Mcf
1
Explode Ind
Yes
Num Pub Evacuated
14.0
Incident Identified Datetime
2020-06-24 09:04:00
Communication State Fed Ind
Yes
Party Initiated Communication
Operator
Initial Responder Com Datetime
2020-06-24 10:13:00
On Site Datetime
2020-06-24 09:04:00
Federal
No
Location Type
Private Property
Incident Area Type
Underground
Incident Area Subtype
Under Soil
Depth Of Cover
28.0
Other Underground Facilities
No
Crossing
No
Pipe Facility Type
Investor Owned
System Part Involved
Service
Installation Year
1973.0
Customer Type
Non-Residential With Meter Capacity Less Than 1,000 Scfh
Was Efv Installed Before Ind
No
Curb Valve Inst Before Inc Ind
No
Pipe Diameter
0.5
Pipe Specification
Astm D1785
Pipe Manufacturer
Unknown
Material Involved
Plastic
Plastic Type
Polyvinyl Cloride (Pvc)
Wt Plastic
0.109
Release Type
Leak
Leak Type
Crack
Class Location Type
Class 3 Location
Est Cost Oper Paid
43000.0
Est Cost Prop Damage
6000.0
Est Cost Emergency
5500.0
Est Cost Other
0.0
Gas Cost In Mcf
1.0
Est Cost Unintentional Release
1.0
Est Cost Intentional Release
0.0
Prpty
54501.0
Commercial Affected
1.0
Industrial Affected
0.0
Residences Affected
0.0
Num Persons Hosp Not Ovnght
0.0
Num Injured Treated By Emt
0.0
Num Resident Building Affctd
1.0
Num Business Building Affctd
1.0
Accident Psig
39.0
Normal Psig
43.0
Mop Psig
43.0
Mop Cfr Section
192.619(A)(2)
Maop Established Date
1973-08-11 00:00:00
Accident Pressure
Pressure Did Not Exceed Maop
Gas Odorized System Type
Injection Pump
Gas Odorized Level
0.3
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
Yes
Num Employees Tested
3
Num Employees Failed
0
Contractor Drug Test Ind
Yes
Num Contractors Tested
3
Num Contractors Failed
1
Cause
Other Outside Force Damage
Cause Details
Other Outside Force Damage
Outside Force Type
Other Outside Force Damage
Osf Other Details
Erosion Of Support Due To Houseline Water Leak.
Preparer Name
M****** R***
Preparer Title
Supervisor Engineering
Preparer Email
M***********@s****.com
Preparer Telephone
(702) 365-2361
Authorizer Name
A****** H****
Authorizer Title
Director Gas Operations
Authorizer Telephone
(702) 365-2049
Authorizer Email
A************@s****.com
Narrative
While conducting an annual pvc leak survey pursuant to southwest gas' dimp plan on june 24, 2020, southwest gas' leak survey contractor contacted southwest gas at 09:04 pdt and reported gas reads of 1 lel near the laundry room riser and zero reads inside the laundry room located at 4337 silver dollar avenue in las vegas, nv. Southwest gas crews arrived at 09:35 pdt and obtained gas reads of 4 lel by the riser to the laundry facility, turned off the meter, confirmed zero gas reads inside the unoccupied building, and conducted further leak investigation. At 10:13 pdt, ignition of fugitive natural gas occurred within the detached, unoccupied laundry facility structure resulting in a fire and property damage. Post ignition leak survey results discovered increasing gas readings and leak spread resulting in an evacuation of 14 people from some units of the adjacent, separate apartment building. A leak on a pvc service line coupling connection fitting was revealed during a leak test of the pvc service during a post incident investigation. Additionally, a leak test performed on the customer's houseline failed during the post incident investigation. Part a4: based on communications that the public utilities commission of nevada's regulatory operations staff had with the pipeline and hazardous materials safety administration's accident investigation division, "local time and date of the incident" reflects the time southwest gas was notified of a leak on the pipeline. At that time, no incident reporting criteria was met. Part a6: southwest gas notified the national response center (nrc) telephonically of the incident on june 24, 2020 at 14:33 pdt. The nrc issued report number 1280311 for the incident. Southwest gas provided a 48-hour update telephonically to the nrc on june 25, 2020 at 15:28 pdt. The nrc issued report number 1280402 for the updated report. Supplemental response: changed part g to update the apparent cause from part g5 to g8. The cause of the leak remains under investigation. Current evidence suggests the cause may be g3, g4, or g5. The sample has been sent to a third-party materials testing laboratory for analysis and the results of the analysis will be provided in a supplemental response. The leak was originally believed to be due to a solvent cement joint, but a crack was found when assessed in southwest gas's materials testing laboratory. The crack appears to be a circumferential crack in the pipe near the location of the pipe to coupling joint. Supplemental response 2: following the incident, the service line was disconnected at the main. On march 30, 2021, the service to the customer was replaced. Part c, 3 and 4 - changed the pipe size and wall thickness to 0.5-inch and 0.109-inch respectively based on 3rd party laboratory analysis. Changed part g from g8 - other incident cause to g4 - other outside force damage, with a sub-cause as other outside force damage. An independent laboratory's material investigation concluded that the root cause of the failure was sustained external bending loads leading to slow crack growth and creep rupture. The field investigation determined that the probable cause of the bending loads was a customer houseline water leak which eroded the support from under the service line's transition fitting.
| Occurred At | 2020-06-24 09:04:00 |
|---|---|
| Year | 2020 |
| Report Received Date | 2020-07-24 00:00:00 |
| Iyear | 2020.0 |
| Report Number | 20200066.0 |
| Supplemental Number | 35216.0 |
| Report Type | Supplemental Final |
| Operator Id | 18536 PHMSA Enforcement |
| Name | Southwest Gas Corp |
| Operator Street Address | 8360 S. Durango Drive |
| Operator City Name | Las Vegas |
| Operator State Abbreviation | NV |
| Operator Postal Code | 89113 |
| Local Datetime | 2020-06-24 09:04:00 |
| Time Zone | Mountain |
| Daylight Savings Ind | Yes |
| Location Street Address | 4337 Silver Dollar Avenue |
| Location City Name | Las Vegas |
| Location County Name | Clark |
| Location State Abbreviation | NV |
| Location Postal Code | 89102 |
| Location Latitude | 36.13821 Google Maps OpenStreetMap |
| Location Longitude | -115.19848 Google Maps OpenStreetMap |
| Flow Cont Other Ind | Yes |
| Flow Cont Other Detail | Closed Fitting At Main-To-Service Connection |
| Nrc Rpt Datetime | 2020-06-24 14:33:00 |
| Nrc Rpt Num | 1280311 NRC Report How to search |
| Additional Nrc Report Numbers | 1280402 |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 1.0 |
| Intentional Release | 0.0 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Ignite Ind | Yes |
| Ignite Datetime | 2020-06-24 10:13:00 |
| How Extinguished | Local/state/federal Emergency Responder |
| Gas Consumed By Fire In Mcf | 1 |
| Explode Ind | Yes |
| Num Pub Evacuated | 14.0 |
| Incident Identified Datetime | 2020-06-24 09:04:00 |
| Communication State Fed Ind | Yes |
| Party Initiated Communication | Operator |
| Initial Responder Com Datetime | 2020-06-24 10:13:00 |
| On Site Datetime | 2020-06-24 09:04:00 |
| Federal | No |
| Location Type | Private Property |
| Incident Area Type | Underground |
| Incident Area Subtype | Under Soil |
| Depth Of Cover | 28.0 |
| Other Underground Facilities | No |
| Crossing | No |
| Pipe Facility Type | Investor Owned |
| System Part Involved | Service |
| Installation Year | 1973.0 |
| Customer Type | Non-Residential With Meter Capacity Less Than 1,000 Scfh |
| Was Efv Installed Before Ind | No |
| Curb Valve Inst Before Inc Ind | No |
| Pipe Diameter | 0.5 |
| Pipe Specification | Astm D1785 |
| Pipe Manufacturer | Unknown |
| Material Involved | Plastic |
| Plastic Type | Polyvinyl Cloride (Pvc) |
| Wt Plastic | 0.109 |
| Release Type | Leak |
| Leak Type | Crack |
| Class Location Type | Class 3 Location |
| Est Cost Oper Paid | 43000.0 |
| Est Cost Prop Damage | 6000.0 |
| Est Cost Emergency | 5500.0 |
| Est Cost Other | 0.0 |
| Gas Cost In Mcf | 1.0 |
| Est Cost Unintentional Release | 1.0 |
| Est Cost Intentional Release | 0.0 |
| Prpty | 54501.0 |
| Commercial Affected | 1.0 |
| Industrial Affected | 0.0 |
| Residences Affected | 0.0 |
| Num Persons Hosp Not Ovnght | 0.0 |
| Num Injured Treated By Emt | 0.0 |
| Num Resident Building Affctd | 1.0 |
| Num Business Building Affctd | 1.0 |
| Accident Psig | 39.0 |
| Normal Psig | 43.0 |
| Mop Psig | 43.0 |
| Mop Cfr Section | 192.619(A)(2) View CFR 49 §192 |
| Maop Established Date | 1973-08-11 00:00:00 |
| Accident Pressure | Pressure Did Not Exceed Maop |
| Gas Odorized System Type | Injection Pump |
| Gas Odorized Level | 0.3 |
| 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 | Yes |
| Num Employees Tested | 3 |
| Num Employees Failed | 0 |
| Contractor Drug Test Ind | Yes |
| Num Contractors Tested | 3 |
| Num Contractors Failed | 1 |
| Cause | Other Outside Force Damage |
| Cause Details | Other Outside Force Damage |
| Outside Force Type | Other Outside Force Damage |
| Osf Other Details | Erosion Of Support Due To Houseline Water Leak. |
| Preparer Name | M****** R*** |
| Preparer Title | Supervisor Engineering |
| Preparer Email | M***********@s****.com |
| Preparer Telephone | (702) 365-2361 |
| Authorizer Name | A****** H**** |
| Authorizer Title | Director Gas Operations |
| Authorizer Telephone | (702) 365-2049 |
| Authorizer Email | A************@s****.com |
| Narrative | While conducting an annual pvc leak survey pursuant to southwest gas' dimp plan on june 24, 2020, southwest gas' leak survey contractor contacted southwest gas at 09:04 pdt and reported gas reads of 1 lel near the laundry room riser and zero reads inside the laundry room located at 4337 silver dollar avenue in las vegas, nv. Southwest gas crews arrived at 09:35 pdt and obtained gas reads of 4 lel by the riser to the laundry facility, turned off the meter, confirmed zero gas reads inside the unoccupied building, and conducted further leak investigation. At 10:13 pdt, ignition of fugitive natural gas occurred within the detached, unoccupied laundry facility structure resulting in a fire and property damage. Post ignition leak survey results discovered increasing gas readings and leak spread resulting in an evacuation of 14 people from some units of the adjacent, separate apartment building. A leak on a pvc service line coupling connection fitting was revealed during a leak test of the pvc service during a post incident investigation. Additionally, a leak test performed on the customer's houseline failed during the post incident investigation. Part a4: based on communications that the public utilities commission of nevada's regulatory operations staff had with the pipeline and hazardous materials safety administration's accident investigation division, "local time and date of the incident" reflects the time southwest gas was notified of a leak on the pipeline. At that time, no incident reporting criteria was met. Part a6: southwest gas notified the national response center (nrc) telephonically of the incident on june 24, 2020 at 14:33 pdt. The nrc issued report number 1280311 for the incident. Southwest gas provided a 48-hour update telephonically to the nrc on june 25, 2020 at 15:28 pdt. The nrc issued report number 1280402 for the updated report. Supplemental response: changed part g to update the apparent cause from part g5 to g8. The cause of the leak remains under investigation. Current evidence suggests the cause may be g3, g4, or g5. The sample has been sent to a third-party materials testing laboratory for analysis and the results of the analysis will be provided in a supplemental response. The leak was originally believed to be due to a solvent cement joint, but a crack was found when assessed in southwest gas's materials testing laboratory. The crack appears to be a circumferential crack in the pipe near the location of the pipe to coupling joint. Supplemental response 2: following the incident, the service line was disconnected at the main. On march 30, 2021, the service to the customer was replaced. Part c, 3 and 4 - changed the pipe size and wall thickness to 0.5-inch and 0.109-inch respectively based on 3rd party laboratory analysis. Changed part g from g8 - other incident cause to g4 - other outside force damage, with a sub-cause as other outside force damage. An independent laboratory's material investigation concluded that the root cause of the failure was sustained external bending loads leading to slow crack growth and creep rupture. The field investigation determined that the probable cause of the bending loads was a customer houseline water leak which eroded the support from under the service line's transition fitting. |
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