Incident details
Operator, cause, commodity and consequences with raw source fields.
HL incident on 2020-09-01 — OK
Operator
Oneok Ngl Pipeline, Llc
Cause
Equipment Failure
Commodity
Hvl Or Other Flammable Or Toxic Fluid Which Is A Gas At Ambient Conditions
Program
HL
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$80
Incident datetime
2020-09-01 21:23
Report number
Location
OK
Narrative
On 9-1-2020 at 20:43 oneok pipeline control received a gas detect alarm at the oneok west texas lpg weatherford station and dispatched field personnel. Upon arriving at the station, the oneok field operator identified vapors leaking from a 1" nipple associated with thermal relief piping at the adjacent oneok arbuckle 2 - weatherford custody meter skid. The meter skid was immediately isolated and the product evacuated. The 1" nipple was removed, replaced and the system was returned to normal service. Upon visual inspection of the 1" nipple, a hairline crack was found in the threads. Follow up corrective action has been made which eliminated the need for the thermal relief. Oneok is continuing the investigation of the 1" nipple, meter skid and associated piping at the arbuckle 2 - weatherford custody meter skid to determine the cause of the release. A supplemental report will be submitted once oneok has completed it's investigation. Update 10/28/2020 the failed 1" nipple was found to show elevated residual stress at the thread crest and thread roots from severe grain deformation imparted during the initial cutting of the threads at manufacture. Because the defect in the threads occurred during manufacture, oneok has replaced the 1" nipples in similar service on the weatherford custody meter skid.
Detailed record list
Report Received Date
2020-09-30 00:00:00
Iyear
2020
Report Number
20200266
Supplemental Number
34453
Report Type
Supplemental Final
Operator Id
32109
Name
Oneok Ngl Pipeline, Llc
Operator Street Address
100 West Fifth Street
Operator City Name
Tulsa
Operator State Abbreviation
OK
Operator Postal Code
74103
Local Datetime
2020-09-01 21:23:00
Location Latitude
32.67485
Location Longitude
-97.92963
Commodity Released Type
Hvl Or Other Flammable Or Toxic Fluid Which Is A Gas At Ambient Conditions
Commodity Subtype
Lpg (Liquefied Petroleum Gas) / Ngl (Natural Gas Liquid)
Unintentional Release Bbls
4.47
Intentional Release Bbls
28
Recovered Bbls
0
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Accident Identifier
Local Operating Personnel, Including Contractors
Operator Type
Operator Employee
Incident Identified Datetime
2020-09-01 21:23:00
System Part Involved
Onshore Pump/meter Station Equipment And Piping
On Off Shore
Onshore
Shutdown Due Accident Ind
No
Shutdown Explain
The Location Of The Release Did Not Affect The Operation Of The Pipeline.
On Site Datetime
2020-09-01 21:23:00
Nrc Rpt Datetime
2020-09-01 22:21:00
Nrc Rpt Num
1286298
Ignite Ind
No
Explode Ind
No
Num Pub Evacuated
0
Pipe Fac Name
Arbuckle 2 Weatherford Station
Segment Name
10624-3 Ringgold Pump Station To Weatherford Traps
Onshore State Abbreviation
Tx
Onshore Postal Code
76087
Onshore City Name
Not Within A Municipality
Onshore County Name
Parker
Designated Location
Milepost/valve Station
Designated Name
Meter Skid
Federal
No
Location Type
Totally Contained On Operator-Controlled Property
Incident Area Type
Aboveground
Incident Area Subtype
Typical Aboveground Facility Piping Or Appurtenance
Crossing
No
Pipe Facility Type
Interstate
Item Involved
Relief Line And Relief Equipment
Installation Year
2020
Material Involved
Carbon Steel
Release Type
Leak
Leak Type
Crack
Wildlife Impact Ind
No
Soil Contamination
No
Long Term Assessment
No
Remediation Ind
No
Water Contam Ind
No
Could Be Hca
Yes
Commodity Reached Hca
Yes
Other Pop Ind
Yes
Other Pop Yes No
Yes
Usa Drinking Ind
Yes
Usa Drinking Yes No
Yes
Usa Ecological Ind
Yes
Usa Ecological Yes No
Yes
Est Cost Oper Paid
0
Est Cost Gas Released
312
Est Cost Prop Damage
80
Est Cost Emergency
2800
Est Cost Environmental
0
Est Cost Other
3800
Est Cost Other Details
Investigation
Prpty
6992
Accident Psig
969
Mop Psig
1480
Accident Pressure
Pressure Did Not Exceed Mop
Pressure Restriction Ind
No
Pipeline Function
> 20% Smys Regulated Transmission
Scada In Place Ind
Yes
Scada Operating Ind
Yes
Scada Functional Ind
Yes
Scada Detection Ind
No
Scada Conf Ind
No
Cpm In Place Ind
Yes
Cpm Operating Ind
Yes
Cpm Functional Ind
Yes
Cpm Detection Ind
No
Cpm Conf Ind
No
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 caused by a cracked nipple operated under normal pressures.
Employee Drug Test Ind
No
Contractor Drug Test Ind
No
Cause
Equipment Failure
Cause Details
Threaded Connection/coupling Failure
Eq Failure Type
Threaded Connection/coupling Failure
Other Stripped Ind
Pipe Nipple
Additional Defect Ind
Yes
Preparer Name
M***** C********
Preparer Title
Regulatory Compliance Specialist
Preparer Email
M***************@o****.com
Preparer Telephone
2542928911
Prepared Date
2020-10-29 00:00:00
Authorizer Name
M***** C********
Authorizer Telephone
2542928911
Authorizer Title
Regulatory Compliance Specialist
Authorizer Email
M***************@o****.com
Narrative
On 9-1-2020 at 20:43 oneok pipeline control received a gas detect alarm at the oneok west texas lpg weatherford station and dispatched field personnel. Upon arriving at the station, the oneok field operator identified vapors leaking from a 1" nipple associated with thermal relief piping at the adjacent oneok arbuckle 2 - weatherford custody meter skid. The meter skid was immediately isolated and the product evacuated. The 1" nipple was removed, replaced and the system was returned to normal service. Upon visual inspection of the 1" nipple, a hairline crack was found in the threads. Follow up corrective action has been made which eliminated the need for the thermal relief. Oneok is continuing the investigation of the 1" nipple, meter skid and associated piping at the arbuckle 2 - weatherford custody meter skid to determine the cause of the release. A supplemental report will be submitted once oneok has completed it's investigation. Update 10/28/2020 the failed 1" nipple was found to show elevated residual stress at the thread crest and thread roots from severe grain deformation imparted during the initial cutting of the threads at manufacture. Because the defect in the threads occurred during manufacture, oneok has replaced the 1" nipples in similar service on the weatherford custody meter skid.
| Report Received Date | 2020-09-30 00:00:00 |
|---|---|
| Iyear | 2020 |
| Report Number | 20200266 |
| Supplemental Number | 34453 |
| Report Type | Supplemental Final |
| Operator Id | 32109 PHMSA Enforcement |
| Name | Oneok Ngl Pipeline, Llc |
| Operator Street Address | 100 West Fifth Street |
| Operator City Name | Tulsa |
| Operator State Abbreviation | OK |
| Operator Postal Code | 74103 |
| Local Datetime | 2020-09-01 21:23:00 |
| Location Latitude | 32.67485 Google Maps OpenStreetMap |
| Location Longitude | -97.92963 Google Maps OpenStreetMap |
| Commodity Released Type | Hvl Or Other Flammable Or Toxic Fluid Which Is A Gas At Ambient Conditions |
| Commodity Subtype | Lpg (Liquefied Petroleum Gas) / Ngl (Natural Gas Liquid) |
| Unintentional Release Bbls | 4.47 |
| Intentional Release Bbls | 28 |
| Recovered Bbls | 0 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Accident Identifier | Local Operating Personnel, Including Contractors |
| Operator Type | Operator Employee |
| Incident Identified Datetime | 2020-09-01 21:23:00 |
| System Part Involved | Onshore Pump/meter Station Equipment And Piping |
| On Off Shore | Onshore |
| Shutdown Due Accident Ind | No |
| Shutdown Explain | The Location Of The Release Did Not Affect The Operation Of The Pipeline. |
| On Site Datetime | 2020-09-01 21:23:00 |
| Nrc Rpt Datetime | 2020-09-01 22:21:00 |
| Nrc Rpt Num | 1286298 NRC Report How to search |
| Ignite Ind | No |
| Explode Ind | No |
| Num Pub Evacuated | 0 |
| Pipe Fac Name | Arbuckle 2 Weatherford Station |
| Segment Name | 10624-3 Ringgold Pump Station To Weatherford Traps |
| Onshore State Abbreviation | Tx |
| Onshore Postal Code | 76087 |
| Onshore City Name | Not Within A Municipality |
| Onshore County Name | Parker |
| Designated Location | Milepost/valve Station |
| Designated Name | Meter Skid |
| Federal | No |
| Location Type | Totally Contained On Operator-Controlled Property |
| Incident Area Type | Aboveground |
| Incident Area Subtype | Typical Aboveground Facility Piping Or Appurtenance |
| Crossing | No |
| Pipe Facility Type | Interstate |
| Item Involved | Relief Line And Relief Equipment |
| Installation Year | 2020 |
| Material Involved | Carbon Steel |
| Release Type | Leak |
| Leak Type | Crack |
| Wildlife Impact Ind | No |
| Soil Contamination | No |
| Long Term Assessment | No |
| Remediation Ind | No |
| Water Contam Ind | No |
| Could Be Hca | Yes |
| Commodity Reached Hca | Yes |
| Other Pop Ind | Yes |
| Other Pop Yes No | Yes |
| Usa Drinking Ind | Yes |
| Usa Drinking Yes No | Yes |
| Usa Ecological Ind | Yes |
| Usa Ecological Yes No | Yes |
| Est Cost Oper Paid | 0 |
| Est Cost Gas Released | 312 |
| Est Cost Prop Damage | 80 |
| Est Cost Emergency | 2800 |
| Est Cost Environmental | 0 |
| Est Cost Other | 3800 |
| Est Cost Other Details | Investigation |
| Prpty | 6992 |
| Accident Psig | 969 |
| Mop Psig | 1480 |
| Accident Pressure | Pressure Did Not Exceed Mop |
| Pressure Restriction Ind | No |
| Pipeline Function | > 20% Smys Regulated Transmission |
| Scada In Place Ind | Yes |
| Scada Operating Ind | Yes |
| Scada Functional Ind | Yes |
| Scada Detection Ind | No |
| Scada Conf Ind | No |
| Cpm In Place Ind | Yes |
| Cpm Operating Ind | Yes |
| Cpm Functional Ind | Yes |
| Cpm Detection Ind | No |
| Cpm Conf Ind | No |
| 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 caused by a cracked nipple operated under normal pressures. |
| Employee Drug Test Ind | No |
| Contractor Drug Test Ind | No |
| Cause | Equipment Failure |
| Cause Details | Threaded Connection/coupling Failure |
| Eq Failure Type | Threaded Connection/coupling Failure |
| Other Stripped Ind | Pipe Nipple |
| Additional Defect Ind | Yes |
| Preparer Name | M***** C******** |
| Preparer Title | Regulatory Compliance Specialist |
| Preparer Email | M***************@o****.com |
| Preparer Telephone | 2542928911 |
| Prepared Date | 2020-10-29 00:00:00 |
| Authorizer Name | M***** C******** |
| Authorizer Telephone | 2542928911 |
| Authorizer Title | Regulatory Compliance Specialist |
| Authorizer Email | M***************@o****.com |
| Narrative | On 9-1-2020 at 20:43 oneok pipeline control received a gas detect alarm at the oneok west texas lpg weatherford station and dispatched field personnel. Upon arriving at the station, the oneok field operator identified vapors leaking from a 1" nipple associated with thermal relief piping at the adjacent oneok arbuckle 2 - weatherford custody meter skid. The meter skid was immediately isolated and the product evacuated. The 1" nipple was removed, replaced and the system was returned to normal service. Upon visual inspection of the 1" nipple, a hairline crack was found in the threads. Follow up corrective action has been made which eliminated the need for the thermal relief. Oneok is continuing the investigation of the 1" nipple, meter skid and associated piping at the arbuckle 2 - weatherford custody meter skid to determine the cause of the release. A supplemental report will be submitted once oneok has completed it's investigation. Update 10/28/2020 the failed 1" nipple was found to show elevated residual stress at the thread crest and thread roots from severe grain deformation imparted during the initial cutting of the threads at manufacture. Because the defect in the threads occurred during manufacture, oneok has replaced the 1" nipples in similar service on the weatherford custody meter skid. |
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