Incident details
Operator, cause, commodity and consequences with raw source fields.
GTG incident on 2024-10-29 — OK
Operator
Transcontinental Gas Pipe Line Company
Cause
Equipment Failure
Commodity
Natural Gas
Program
GTG
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$391,833
Incident datetime
2024-10-29 00:00 UTC
Report number
Location
OK
Narrative
On 10/2 operations noticed a natural gas odor while doing valve maintenance at the prospector valve site on the marcus hk woodbury a (line mhwda-t-t-t). Operations detected a leak near the buried valve j353 and, due to the depth, required assistance to excavate. On 10/3 they were able to hand excavate the area enough to visually inspect the valve. A leak on a 12" valve was found based off bubbles were coming out of the bolted connection between the valve bonnet and body. On 10/5, segment was isolated and customer was utilized to draw down pressure to 300 psi prior to recompressing remaining product down to 25 psi, which was then vented to atmosphere through a charcoal filter. Valve was cut out of the line and replaced with straight pipe. Cause of the leak was determined to be a worn o-ring seal in the bonnet of the valve.
Detailed record list
Report Received Date
2024-10-29 00:00:00
Iyear
2024
Report Number
20240121
Supplemental Number
40372
Report Type
Supplemental Final
Operator Id
19570
Name
Transcontinental Gas Pipe Line Company
Operator Street Address
One Williams Center Md 43-4
Operator City Name
Tulsa
Operator State Abbreviation
OK
Operator Postal Code
74172
Time Zone
Eastern
Daylight Savings Ind
Yes
Location Latitude
39.78985143
Location Longitude
-75.38782257
Nrc Rpt Num
1412708
Additional Nrc Report Numbers
1412827
Commodity Released Type
Natural Gas
Unintentional Release
7.61
Intentional Release
86.5
Accompanying Liquid
0
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Status When Identified
Normal Operation, Includes Pauses During Maintenance
Shutdown Due Accident Ind
Yes
Still Shutdown Ind
Yes
Communication State Fed Ind
No
Ignite Ind
No
Upstream Action Taken
Valve Closure
Downstream Action Taken
Valve Closure
Num Pub Evacuated
0
On Off Shore
Onshore
Onshore State Abbreviation
Nj
Onshore Postal Code
08085
Onshore City Name
Prospect
Onshore County Name
Gloucester County
Designated Location
Survey Station No.
Designated Name
153+12
Pipe Fac Name
Marcus-Hook Woodbury "a" Line
Segment Name
Mhwda-T-T-T
Federal
No
Location Type
Operator-Controlled Property
Incident Area Type
Underground
Incident Area Subtype
Under Soil
Depth Of Cover
36
Other Underground Facilities
No
Crossing
No
Pipe Facility Type
Interstate
System Part Involved
Onshore Pipeline, Including Valve Sites
Item Involved
Valve
Valve Type
Mainline
Valve Mainline Type
Gate
Valve Manufacturer
Wkm
Installation Year
1973
Manufactured Year
Unknown
Material Involved
Carbon Steel
Release Type
Leak
Leak Type
Seal Or Packing
Class Location Type
Class 1 Location
Could Be Hca
No
Pir Radius
372
Heat Damage Ind
No
Non Heat Damage Ind
No
Did Occur In Mca Ind
No
Est Cost Oper Paid
0
Est Cost Unintentional Release
43
Est Cost Intentional Release
488
Est Cost Prop Damage
391833
Est Cost Emergency
11725
Est Cost Other
0
Gas Cost In Mcf
5.64
Prpty
404089
Num Persons Hosp Not Ovnght
0
Num Injured Treated By Emt
0
Num Resident Building Affctd
0
Num Business Building Affctd
0
Wildlife Impact Ind
No
Accident Psig
750
Gas Flow In Pipe In Mcf
1000
Mop Psig
800
Mop Cfr Section
192.619(A)(2)
Maop Established Date
1990-08-06 00:00:00
Maop Reversal Flow Ind
No
Accident Pressure
Pressure Did Not Exceed Maop
Pressure Restriction Ind
No
Gas Required Odorized Ind
No
Upstream Valve Type Ind
Manual
Downstream Valve Type Ind
Manual
Length Segment Isolated
15312
Internal Inspection Ind
Yes
Operation Complications Ind
No
Pipeline Function
Transmission System
Scada In Place Ind
No
Accident Identifier
Local Operating Personnel, Including Contractors
Operator Type
Operator Employee
Investigation Status
No, the operator did not find that an investigation of the controller(s) actions or control room issues was necessary due to: (provide an explanation for why the operator did not investigate)
Investigation Status Details
The leak was through the mating point of the body and bonnet.
Employee Drug Test Ind
No
Contractor Drug Test Ind
No
Cause
Equipment Failure
Cause Details
Non-Threaded Connection Failure
Eq Failure Type
Non-Threaded Connection Failure
Other Non Threaded Ind
Other
Other Non Threaded Details
Valve Bonnet O-Ring Was Worn.
Eq Additional Other Ind
Yes
Eq Additional Other Details
Valve Bonnet O-Ring
Preparer Name
K****** C***
Preparer Title
Regulatory Compliance Specialist Sr
Preparer Email
K***********@w*******.com
Preparer Telephone
267-454-8569
Authorizer Name
E*** W****
Authorizer Title
Manager Pipeline Safety
Authorizer Telephone
281-536-9504
Authorizer Email
E*********@w*******.com
Narrative
On 10/2 operations noticed a natural gas odor while doing valve maintenance at the prospector valve site on the marcus hk woodbury a (line mhwda-t-t-t). Operations detected a leak near the buried valve j353 and, due to the depth, required assistance to excavate. On 10/3 they were able to hand excavate the area enough to visually inspect the valve. A leak on a 12" valve was found based off bubbles were coming out of the bolted connection between the valve bonnet and body. On 10/5, segment was isolated and customer was utilized to draw down pressure to 300 psi prior to recompressing remaining product down to 25 psi, which was then vented to atmosphere through a charcoal filter. Valve was cut out of the line and replaced with straight pipe. Cause of the leak was determined to be a worn o-ring seal in the bonnet of the valve.
| Report Received Date | 2024-10-29 00:00:00 |
|---|---|
| Iyear | 2024 |
| Report Number | 20240121 |
| Supplemental Number | 40372 |
| Report Type | Supplemental Final |
| Operator Id | 19570 PHMSA Enforcement |
| Name | Transcontinental Gas Pipe Line Company |
| Operator Street Address | One Williams Center Md 43-4 |
| Operator City Name | Tulsa |
| Operator State Abbreviation | OK |
| Operator Postal Code | 74172 |
| Time Zone | Eastern |
| Daylight Savings Ind | Yes |
| Location Latitude | 39.78985143 Google Maps OpenStreetMap |
| Location Longitude | -75.38782257 Google Maps OpenStreetMap |
| Nrc Rpt Num | 1412708 NRC Report How to search |
| Additional Nrc Report Numbers | 1412827 |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 7.61 |
| Intentional Release | 86.5 |
| Accompanying Liquid | 0 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Status When Identified | Normal Operation, Includes Pauses During Maintenance |
| Shutdown Due Accident Ind | Yes |
| Still Shutdown Ind | Yes |
| Communication State Fed Ind | No |
| Ignite Ind | No |
| Upstream Action Taken | Valve Closure |
| Downstream Action Taken | Valve Closure |
| Num Pub Evacuated | 0 |
| On Off Shore | Onshore |
| Onshore State Abbreviation | Nj |
| Onshore Postal Code | 08085 |
| Onshore City Name | Prospect |
| Onshore County Name | Gloucester County |
| Designated Location | Survey Station No. |
| Designated Name | 153+12 |
| Pipe Fac Name | Marcus-Hook Woodbury "a" Line |
| Segment Name | Mhwda-T-T-T |
| Federal | No |
| Location Type | Operator-Controlled Property |
| Incident Area Type | Underground |
| Incident Area Subtype | Under Soil |
| Depth Of Cover | 36 |
| Other Underground Facilities | No |
| Crossing | No |
| Pipe Facility Type | Interstate |
| System Part Involved | Onshore Pipeline, Including Valve Sites |
| Item Involved | Valve |
| Valve Type | Mainline |
| Valve Mainline Type | Gate |
| Valve Manufacturer | Wkm |
| Installation Year | 1973 |
| Manufactured Year | Unknown |
| Material Involved | Carbon Steel |
| Release Type | Leak |
| Leak Type | Seal Or Packing |
| Class Location Type | Class 1 Location |
| Could Be Hca | No |
| Pir Radius | 372 |
| Heat Damage Ind | No |
| Non Heat Damage Ind | No |
| Did Occur In Mca Ind | No |
| Est Cost Oper Paid | 0 |
| Est Cost Unintentional Release | 43 |
| Est Cost Intentional Release | 488 |
| Est Cost Prop Damage | 391833 |
| Est Cost Emergency | 11725 |
| Est Cost Other | 0 |
| Gas Cost In Mcf | 5.64 |
| Prpty | 404089 |
| Num Persons Hosp Not Ovnght | 0 |
| Num Injured Treated By Emt | 0 |
| Num Resident Building Affctd | 0 |
| Num Business Building Affctd | 0 |
| Wildlife Impact Ind | No |
| Accident Psig | 750 |
| Gas Flow In Pipe In Mcf | 1000 |
| Mop Psig | 800 |
| Mop Cfr Section | 192.619(A)(2) View CFR 49 §192 |
| Maop Established Date | 1990-08-06 00:00:00 |
| Maop Reversal Flow Ind | No |
| Accident Pressure | Pressure Did Not Exceed Maop |
| Pressure Restriction Ind | No |
| Gas Required Odorized Ind | No |
| Upstream Valve Type Ind | Manual |
| Downstream Valve Type Ind | Manual |
| Length Segment Isolated | 15312 |
| Internal Inspection Ind | Yes |
| Operation Complications Ind | No |
| Pipeline Function | Transmission System |
| Scada In Place Ind | No |
| Accident Identifier | Local Operating Personnel, Including Contractors |
| Operator Type | Operator Employee |
| Investigation Status | No, the operator did not find that an investigation of the controller(s) actions or control room issues was necessary due to: (provide an explanation for why the operator did not investigate) |
| Investigation Status Details | The leak was through the mating point of the body and bonnet. |
| Employee Drug Test Ind | No |
| Contractor Drug Test Ind | No |
| Cause | Equipment Failure |
| Cause Details | Non-Threaded Connection Failure |
| Eq Failure Type | Non-Threaded Connection Failure |
| Other Non Threaded Ind | Other |
| Other Non Threaded Details | Valve Bonnet O-Ring Was Worn. |
| Eq Additional Other Ind | Yes |
| Eq Additional Other Details | Valve Bonnet O-Ring |
| Preparer Name | K****** C*** |
| Preparer Title | Regulatory Compliance Specialist Sr |
| Preparer Email | K***********@w*******.com |
| Preparer Telephone | 267-454-8569 |
| Authorizer Name | E*** W**** |
| Authorizer Title | Manager Pipeline Safety |
| Authorizer Telephone | 281-536-9504 |
| Authorizer Email | E*********@w*******.com |
| Narrative | On 10/2 operations noticed a natural gas odor while doing valve maintenance at the prospector valve site on the marcus hk woodbury a (line mhwda-t-t-t). Operations detected a leak near the buried valve j353 and, due to the depth, required assistance to excavate. On 10/3 they were able to hand excavate the area enough to visually inspect the valve. A leak on a 12" valve was found based off bubbles were coming out of the bolted connection between the valve bonnet and body. On 10/5, segment was isolated and customer was utilized to draw down pressure to 300 psi prior to recompressing remaining product down to 25 psi, which was then vented to atmosphere through a charcoal filter. Valve was cut out of the line and replaced with straight pipe. Cause of the leak was determined to be a worn o-ring seal in the bonnet of the valve. |
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