Incident details
Operator, cause, commodity and consequences with raw source fields.
GD incident on 2021-08-26 — AZ
Operator
Southwest Gas Corp
Cause
Pipe, Weld, Or Joint Failure
Commodity
Natural Gas
Program
GD
Damage and Injuries
0 fatalities
4 injuries
Property damage (nominal)
$43,129
Incident datetime
2021-08-26 09:55
Report number
Location
AZ, MARICOPA
Narrative
Pl 2021-0128 southwest gas corporation (swg) responded to a reported fire at 4940 west ray road in chandler called in by the fire department at 09:30. Swg construction technician responded to find a strip-mall that appeared to be damaged by an explosion. Fire department reported that four people were transported to the hospital with injuries. Swg crews responded and controlled the flow of gas by squeezing the 2-inch plastic pipeline that supplies gas to the commercial property resulting in an outage of seven active accounts (six commercial and one residential). Notification was made to PHMSA via the national response center (nrc) on august 26, 2021 at 11:09 and was given nrc report #1314811. An update was provided to the nrc on august 27, 2021 at 11:31 and was given nrc report #1314910. Notification was made to chemical safety and hazard investigation board (csb) on august 26,2021 at 12:05. The apparent leak cause is listed as g5 - pipe, weld, or joint failure. The incident investigation is still ongoing, and a supplemental report will be submitted upon completion of the investigation by swg. Note: for part a, #10, the estimated volume of gas released that is identified represents an estimate that presumes a crack that is leaking at 56 psi, beginning at the time of the initial report of the incident and ending at the time the pipeline was shut down. However, the actual amount of gas loss is unknown because the time the gas pipeline began leaking is unknown. Supplemental report: laboratory data analysis shows the leak was caused by thermal-oxidative degradation extending from the inner wall to the mid-wall of the tubing that resulted in a through-wall axial crack. Section g5 was updated from "slit crack" to "thermal-oxidative degradation".
Detailed record list
Occurred At
2021-08-26 09:55:00
Year
2021
Report Received Date
2021-09-20 00:00:00
Iyear
2021.0
Report Number
20210080.0
Supplemental Number
37226.0
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
2021-08-26 09:30:00
Time Zone
Mountain
Daylight Savings Ind
No
Location Street Address
4940 West Ray Road
Location City Name
Chandler
Location County Name
Maricopa
Location State Abbreviation
AZ
Location Postal Code
85226
Location Latitude
33.32135
Location Longitude
-111.92575
Flow Cont Squeeze Off Ind
Yes
Nrc Rpt Datetime
2021-08-26 00:00:00
Nrc Rpt Num
1314811
Additional Nrc Report Numbers
1314910
Commodity Released Type
Natural Gas
Unintentional Release
7.0
Intentional Release
0.0
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
4
Injure
4
Ignite Ind
Yes
Ignite Datetime
2021-08-26 09:30:00
How Extinguished
Allowed To Burn Out
Gas Consumed By Fire In Mcf
7
Explode Ind
Yes
Num Pub Evacuated
20.0
Incident Identified Datetime
2021-08-26 09:55:00
On Site Datetime
2021-08-26 09:55:00
Federal
No
Location Type
Private Property
Incident Area Type
Underground
Incident Area Subtype
Under Pavement
Depth Of Cover
44.0
Other Underground Facilities
No
Crossing
No
Pipe Facility Type
Investor Owned
System Part Involved
Service
Installation Year
1999.0
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
1.0
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
Crack
Class Location Type
Class 3 Location
Est Cost Oper Paid
5000000.0
Est Cost Prop Damage
43129.0
Est Cost Emergency
4000.0
Est Cost Other
0.0
Gas Cost In Mcf
38.57
Est Cost Unintentional Release
270.0
Est Cost Intentional Release
0.0
Prpty
5047399.0
Commercial Affected
6.0
Industrial Affected
0.0
Residences Affected
1.0
Num Persons Hosp Not Ovnght
0.0
Num Injured Treated By Emt
0.0
Num Resident Building Affctd
1.0
Num Business Building Affctd
6.0
Accident Psig
56.0
Normal Psig
56.0
Mop Psig
60.0
Mop Cfr Section
192.619(A)(2)
Maop Established Date
1999-07-12 00:00:00
Accident Pressure
Pressure Did Not Exceed Maop
Gas Odorized System Type
None
Gas Odorized Level
0.3
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
Body Of Pipe
Pwjf Failure Type
Body Of Pipe
Pipe Body Subtype
Crack
Additional Crack Ind
Yes
Result Material Ind
Yes
Result Material Subtype
Other
Result Material Details
Thermal-Oxidative Degradation
Hydrotest Conducted Ind
No
Preparer Name
S**** B****
Preparer Title
Administrator Division Compliance
Preparer Email
S**********@s****.com
Preparer Telephone
602-484-5489
Preparer Fax
602-484-5322
Local Contact Name
S**** B****
Local Contact Email
S**********@s****.com
Local Contact Telephone
602-484-5489
Authorizer Name
R***** M****
Authorizer Title
Director Central Support
Authorizer Telephone
602-484-5367
Authorizer Email
R***********@s****.com
Narrative
Pl 2021-0128 southwest gas corporation (swg) responded to a reported fire at 4940 west ray road in chandler called in by the fire department at 09:30. Swg construction technician responded to find a strip-mall that appeared to be damaged by an explosion. Fire department reported that four people were transported to the hospital with injuries. Swg crews responded and controlled the flow of gas by squeezing the 2-inch plastic pipeline that supplies gas to the commercial property resulting in an outage of seven active accounts (six commercial and one residential). Notification was made to PHMSA via the national response center (nrc) on august 26, 2021 at 11:09 and was given nrc report #1314811. An update was provided to the nrc on august 27, 2021 at 11:31 and was given nrc report #1314910. Notification was made to chemical safety and hazard investigation board (csb) on august 26,2021 at 12:05. The apparent leak cause is listed as g5 - pipe, weld, or joint failure. The incident investigation is still ongoing, and a supplemental report will be submitted upon completion of the investigation by swg. Note: for part a, #10, the estimated volume of gas released that is identified represents an estimate that presumes a crack that is leaking at 56 psi, beginning at the time of the initial report of the incident and ending at the time the pipeline was shut down. However, the actual amount of gas loss is unknown because the time the gas pipeline began leaking is unknown. Supplemental report: laboratory data analysis shows the leak was caused by thermal-oxidative degradation extending from the inner wall to the mid-wall of the tubing that resulted in a through-wall axial crack. Section g5 was updated from "slit crack" to "thermal-oxidative degradation".
| Occurred At | 2021-08-26 09:55:00 |
|---|---|
| Year | 2021 |
| Report Received Date | 2021-09-20 00:00:00 |
| Iyear | 2021.0 |
| Report Number | 20210080.0 |
| Supplemental Number | 37226.0 |
| 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 | 2021-08-26 09:30:00 |
| Time Zone | Mountain |
| Daylight Savings Ind | No |
| Location Street Address | 4940 West Ray Road |
| Location City Name | Chandler |
| Location County Name | Maricopa |
| Location State Abbreviation | AZ |
| Location Postal Code | 85226 |
| Location Latitude | 33.32135 Google Maps OpenStreetMap |
| Location Longitude | -111.92575 Google Maps OpenStreetMap |
| Flow Cont Squeeze Off Ind | Yes |
| Nrc Rpt Datetime | 2021-08-26 00:00:00 |
| Nrc Rpt Num | 1314811 NRC Report How to search |
| Additional Nrc Report Numbers | 1314910 |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 7.0 |
| Intentional Release | 0.0 |
| 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 | 4 |
| Injure | 4 |
| Ignite Ind | Yes |
| Ignite Datetime | 2021-08-26 09:30:00 |
| How Extinguished | Allowed To Burn Out |
| Gas Consumed By Fire In Mcf | 7 |
| Explode Ind | Yes |
| Num Pub Evacuated | 20.0 |
| Incident Identified Datetime | 2021-08-26 09:55:00 |
| On Site Datetime | 2021-08-26 09:55:00 |
| Federal | No |
| Location Type | Private Property |
| Incident Area Type | Underground |
| Incident Area Subtype | Under Pavement |
| Depth Of Cover | 44.0 |
| Other Underground Facilities | No |
| Crossing | No |
| Pipe Facility Type | Investor Owned |
| System Part Involved | Service |
| Installation Year | 1999.0 |
| 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 | 1.0 |
| 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 | Crack |
| Class Location Type | Class 3 Location |
| Est Cost Oper Paid | 5000000.0 |
| Est Cost Prop Damage | 43129.0 |
| Est Cost Emergency | 4000.0 |
| Est Cost Other | 0.0 |
| Gas Cost In Mcf | 38.57 |
| Est Cost Unintentional Release | 270.0 |
| Est Cost Intentional Release | 0.0 |
| Prpty | 5047399.0 |
| Commercial Affected | 6.0 |
| Industrial Affected | 0.0 |
| Residences Affected | 1.0 |
| Num Persons Hosp Not Ovnght | 0.0 |
| Num Injured Treated By Emt | 0.0 |
| Num Resident Building Affctd | 1.0 |
| Num Business Building Affctd | 6.0 |
| Accident Psig | 56.0 |
| Normal Psig | 56.0 |
| Mop Psig | 60.0 |
| Mop Cfr Section | 192.619(A)(2) View CFR 49 §192 |
| Maop Established Date | 1999-07-12 00:00:00 |
| Accident Pressure | Pressure Did Not Exceed Maop |
| Gas Odorized System Type | None |
| Gas Odorized Level | 0.3 |
| 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 | Body Of Pipe |
| Pwjf Failure Type | Body Of Pipe |
| Pipe Body Subtype | Crack |
| Additional Crack Ind | Yes |
| Result Material Ind | Yes |
| Result Material Subtype | Other |
| Result Material Details | Thermal-Oxidative Degradation |
| Hydrotest Conducted Ind | No |
| Preparer Name | S**** B**** |
| Preparer Title | Administrator Division Compliance |
| Preparer Email | S**********@s****.com |
| Preparer Telephone | 602-484-5489 |
| Preparer Fax | 602-484-5322 |
| Local Contact Name | S**** B**** |
| Local Contact Email | S**********@s****.com |
| Local Contact Telephone | 602-484-5489 |
| Authorizer Name | R***** M**** |
| Authorizer Title | Director Central Support |
| Authorizer Telephone | 602-484-5367 |
| Authorizer Email | R***********@s****.com |
| Narrative | Pl 2021-0128 southwest gas corporation (swg) responded to a reported fire at 4940 west ray road in chandler called in by the fire department at 09:30. Swg construction technician responded to find a strip-mall that appeared to be damaged by an explosion. Fire department reported that four people were transported to the hospital with injuries. Swg crews responded and controlled the flow of gas by squeezing the 2-inch plastic pipeline that supplies gas to the commercial property resulting in an outage of seven active accounts (six commercial and one residential). Notification was made to PHMSA via the national response center (nrc) on august 26, 2021 at 11:09 and was given nrc report #1314811. An update was provided to the nrc on august 27, 2021 at 11:31 and was given nrc report #1314910. Notification was made to chemical safety and hazard investigation board (csb) on august 26,2021 at 12:05. The apparent leak cause is listed as g5 - pipe, weld, or joint failure. The incident investigation is still ongoing, and a supplemental report will be submitted upon completion of the investigation by swg. Note: for part a, #10, the estimated volume of gas released that is identified represents an estimate that presumes a crack that is leaking at 56 psi, beginning at the time of the initial report of the incident and ending at the time the pipeline was shut down. However, the actual amount of gas loss is unknown because the time the gas pipeline began leaking is unknown. Supplemental report: laboratory data analysis shows the leak was caused by thermal-oxidative degradation extending from the inner wall to the mid-wall of the tubing that resulted in a through-wall axial crack. Section g5 was updated from "slit crack" to "thermal-oxidative degradation". |
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