Incident details
Operator, cause, commodity and consequences with raw source fields.
HL incident on 2023-05-12 — CO
Operator
Tallgrass Powder River Gateway, Llc
Cause
Incorrect Operation
Commodity
Crude Oil
Program
HL
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$8,198
Incident datetime
2023-05-12 00:00 UTC
Report number
Location
CO
Narrative
5/12/2023 original narrative on april 13, 2023, operator personnel were opening vaults containing valves ahead of bi-annual valve maintenance. When the vault for mov-613 at the guernsey north terminal was opened, crude oil was observed. The facility was in a pause between batches and mov-613 was isolated to contain the leak. After the vault was cleaned and cleared for entry, the ansi 150 flange was found to have failed at the at the 8:00 o'clock position on downstream side of the valve in relation to flow. No damage was found on the isolation gasket that would indicate a failure. An investigation is still underway to determine apparent cause and a supplemental report will be submitted once the investigation is complete. Until tallgrass concludes its investigation, it has implemented certain interim measures including opening the vaults at the terminal and visually inspecting them with increased frequency. The crude oil release was confined completely to the vault containing mov-613. There is no impact to the terminal outside of the concrete vault. Another valve in the terminal, installed in a similar fashion as mov-613, was inspected as a preventative measure. Tallgrass will also implement the interim measures discussed above at the other valve vault on the terminal. 5/16/2024 update part g apparent cause updated to g7 incorrect operation the investigation determined that the flange was not properly torqued which resulted in an improper gasket seal causing product to be released into the fully contained concrete vault. The uneven torque placed upon the flange caused an uneven loading of the flange face. Once the flange bolts were tightened to 600 ft/lbs utilising a proper torque sequence the release terminated. The gasket was replaced at the time of the event. Tallgrass has developed site-specific procedure to include periodic inspections of the valves in vaults on a weekly basis.
Detailed record list
Report Received Date
2023-05-12 00:00:00
Iyear
2023
Report Number
20230097
Supplemental Number
39558
Report Type
Supplemental Final
Operator Id
39963
Name
Tallgrass Powder River Gateway, Llc
Operator Street Address
370 Van Gordon Street
Operator City Name
Lakewood
Operator State Abbreviation
CO
Operator Postal Code
80228
Time Zone
Mountain
Daylight Savings Ind
Yes
Location Latitude
42.254454
Location Longitude
-104.669554
Commodity Released Type
Crude Oil
Unintentional Release Bbls
21
Recovered Bbls
21
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Accident Identifier
Local Operating Personnel, Including Contractors
Operator Type
Operator Employee
System Part Involved
Onshore Terminal/tank Farm Equipment And Piping
On Off Shore
Onshore
Status When Identified
Normal Operation, Includes Pauses Between Batches And During Maintenance
Shutdown Due Accident Ind
No
Shutdown Explain
Tank And Associated Piping Was Isolated From Pipeline
Communication State Fed Ind
No
Nrc Rpt Num
Nrc Notification Not Required
Ignite Ind
No
Notify Qualified Indiv Ind
Yes
Oil Spill Removal Org Ind
No
Num Pub Evacuated
0
Pipe Fac Name
Guernsey North
Segment Name
Mov 613
Onshore State Abbreviation
Wy
Onshore Postal Code
82214
Onshore City Name
Not Within A Municipality
Onshore County Name
Platte
Designated Location
Milepost
Designated Name
Facility
Federal
No
Location Type
Totally Contained On Operator-Controlled Property
Incident Area Type
Underground
Incident Area Subtype
In Underground Enclosed Space (E.g. Vault)
Depth Of Cover
72
Crossing
No
Pipe Facility Type
Interstate
Item Involved
Valve
Valve Type
Auxiliary Or Other Valve
Installation Year
2015
Manufactured Year
Unknown
Material Involved
Material Other Than Carbon Steel
Material Details
Cast Steel
Release Type
Leak
Leak Type
Connection Failure
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
No
Est Cost Oper Paid
0
Est Cost Gas Released
1726
Est Cost Prop Damage
8198
Est Cost Emergency
4434
Est Cost Environmental
0
Est Cost Other
0
Prpty
14358
Num Persons Hosp Not Ovnght
0
Num Injured Treated By Emt
0
Num Resident Building Affctd
0
Num Business Building Affctd
0
Accident Psig
2.4
Mop Psig
285
Mop Cfr Section
Component Design Pressure �195.406(A)(2)
Maop Established Date
2015-12-13 00:00:00
Maop Reversal Flow Ind
No
Accident Pressure
Pressure Did Not Exceed Mop
Pressure Restriction Ind
No
Pipeline Function
> 20% Smys Regulated Transmission
Scada In Place Ind
No
Cpm In Place Ind
No
Investigation Status
No, the facility was not monitored by a controller(s) at the time of the accident
Employee Drug Test Ind
No
Contractor Drug Test Ind
No
Cause
Incorrect Operation
Cause Details
Equipment Not Installed Properly
Operation Type
Equipment Not Installed Properly
Related Other Ind
Yes
Operation Related Details
Installation Done By Prior Operator
Category Type
Construction
Operator Qualification Ind
No
Preparer Name
K****** M********
Preparer Title
Sr. Compliance Coordinator
Preparer Email
K****************@t********.com
Preparer Telephone
303-763-3408
Prepared Date
2024-05-16 00:00:00
Authorizer Name
D******* S*******
Authorizer Telephone
7137250147
Authorizer Title
Director Phmsa Compliance
Authorizer Email
D****************@t********.com
Narrative
5/12/2023 original narrative on april 13, 2023, operator personnel were opening vaults containing valves ahead of bi-annual valve maintenance. When the vault for mov-613 at the guernsey north terminal was opened, crude oil was observed. The facility was in a pause between batches and mov-613 was isolated to contain the leak. After the vault was cleaned and cleared for entry, the ansi 150 flange was found to have failed at the at the 8:00 o'clock position on downstream side of the valve in relation to flow. No damage was found on the isolation gasket that would indicate a failure. An investigation is still underway to determine apparent cause and a supplemental report will be submitted once the investigation is complete. Until tallgrass concludes its investigation, it has implemented certain interim measures including opening the vaults at the terminal and visually inspecting them with increased frequency. The crude oil release was confined completely to the vault containing mov-613. There is no impact to the terminal outside of the concrete vault. Another valve in the terminal, installed in a similar fashion as mov-613, was inspected as a preventative measure. Tallgrass will also implement the interim measures discussed above at the other valve vault on the terminal. 5/16/2024 update part g apparent cause updated to g7 incorrect operation the investigation determined that the flange was not properly torqued which resulted in an improper gasket seal causing product to be released into the fully contained concrete vault. The uneven torque placed upon the flange caused an uneven loading of the flange face. Once the flange bolts were tightened to 600 ft/lbs utilising a proper torque sequence the release terminated. The gasket was replaced at the time of the event. Tallgrass has developed site-specific procedure to include periodic inspections of the valves in vaults on a weekly basis.
| Report Received Date | 2023-05-12 00:00:00 |
|---|---|
| Iyear | 2023 |
| Report Number | 20230097 |
| Supplemental Number | 39558 |
| Report Type | Supplemental Final |
| Operator Id | 39963 PHMSA Enforcement |
| Name | Tallgrass Powder River Gateway, Llc |
| Operator Street Address | 370 Van Gordon Street |
| Operator City Name | Lakewood |
| Operator State Abbreviation | CO |
| Operator Postal Code | 80228 |
| Time Zone | Mountain |
| Daylight Savings Ind | Yes |
| Location Latitude | 42.254454 Google Maps OpenStreetMap |
| Location Longitude | -104.669554 Google Maps OpenStreetMap |
| Commodity Released Type | Crude Oil |
| Unintentional Release Bbls | 21 |
| Recovered Bbls | 21 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Accident Identifier | Local Operating Personnel, Including Contractors |
| Operator Type | Operator Employee |
| System Part Involved | Onshore Terminal/tank Farm Equipment And Piping |
| On Off Shore | Onshore |
| Status When Identified | Normal Operation, Includes Pauses Between Batches And During Maintenance |
| Shutdown Due Accident Ind | No |
| Shutdown Explain | Tank And Associated Piping Was Isolated From Pipeline |
| Communication State Fed Ind | No |
| Nrc Rpt Num | Nrc Notification Not Required NRC Report How to search |
| Ignite Ind | No |
| Notify Qualified Indiv Ind | Yes |
| Oil Spill Removal Org Ind | No |
| Num Pub Evacuated | 0 |
| Pipe Fac Name | Guernsey North |
| Segment Name | Mov 613 |
| Onshore State Abbreviation | Wy |
| Onshore Postal Code | 82214 |
| Onshore City Name | Not Within A Municipality |
| Onshore County Name | Platte |
| Designated Location | Milepost |
| Designated Name | Facility |
| Federal | No |
| Location Type | Totally Contained On Operator-Controlled Property |
| Incident Area Type | Underground |
| Incident Area Subtype | In Underground Enclosed Space (E.g. Vault) |
| Depth Of Cover | 72 |
| Crossing | No |
| Pipe Facility Type | Interstate |
| Item Involved | Valve |
| Valve Type | Auxiliary Or Other Valve |
| Installation Year | 2015 |
| Manufactured Year | Unknown |
| Material Involved | Material Other Than Carbon Steel |
| Material Details | Cast Steel |
| Release Type | Leak |
| Leak Type | Connection Failure |
| 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 | No |
| Est Cost Oper Paid | 0 |
| Est Cost Gas Released | 1726 |
| Est Cost Prop Damage | 8198 |
| Est Cost Emergency | 4434 |
| Est Cost Environmental | 0 |
| Est Cost Other | 0 |
| Prpty | 14358 |
| Num Persons Hosp Not Ovnght | 0 |
| Num Injured Treated By Emt | 0 |
| Num Resident Building Affctd | 0 |
| Num Business Building Affctd | 0 |
| Accident Psig | 2.4 |
| Mop Psig | 285 |
| Mop Cfr Section | Component Design Pressure �195.406(A)(2) View CFR 49 §192 |
| Maop Established Date | 2015-12-13 00:00:00 |
| Maop Reversal Flow Ind | No |
| Accident Pressure | Pressure Did Not Exceed Mop |
| Pressure Restriction Ind | No |
| Pipeline Function | > 20% Smys Regulated Transmission |
| Scada In Place Ind | No |
| Cpm In Place Ind | No |
| Investigation Status | No, the facility was not monitored by a controller(s) at the time of the accident |
| Employee Drug Test Ind | No |
| Contractor Drug Test Ind | No |
| Cause | Incorrect Operation |
| Cause Details | Equipment Not Installed Properly |
| Operation Type | Equipment Not Installed Properly |
| Related Other Ind | Yes |
| Operation Related Details | Installation Done By Prior Operator |
| Category Type | Construction |
| Operator Qualification Ind | No |
| Preparer Name | K****** M******** |
| Preparer Title | Sr. Compliance Coordinator |
| Preparer Email | K****************@t********.com |
| Preparer Telephone | 303-763-3408 |
| Prepared Date | 2024-05-16 00:00:00 |
| Authorizer Name | D******* S******* |
| Authorizer Telephone | 7137250147 |
| Authorizer Title | Director Phmsa Compliance |
| Authorizer Email | D****************@t********.com |
| Narrative | 5/12/2023 original narrative on april 13, 2023, operator personnel were opening vaults containing valves ahead of bi-annual valve maintenance. When the vault for mov-613 at the guernsey north terminal was opened, crude oil was observed. The facility was in a pause between batches and mov-613 was isolated to contain the leak. After the vault was cleaned and cleared for entry, the ansi 150 flange was found to have failed at the at the 8:00 o'clock position on downstream side of the valve in relation to flow. No damage was found on the isolation gasket that would indicate a failure. An investigation is still underway to determine apparent cause and a supplemental report will be submitted once the investigation is complete. Until tallgrass concludes its investigation, it has implemented certain interim measures including opening the vaults at the terminal and visually inspecting them with increased frequency. The crude oil release was confined completely to the vault containing mov-613. There is no impact to the terminal outside of the concrete vault. Another valve in the terminal, installed in a similar fashion as mov-613, was inspected as a preventative measure. Tallgrass will also implement the interim measures discussed above at the other valve vault on the terminal. 5/16/2024 update part g apparent cause updated to g7 incorrect operation the investigation determined that the flange was not properly torqued which resulted in an improper gasket seal causing product to be released into the fully contained concrete vault. The uneven torque placed upon the flange caused an uneven loading of the flange face. Once the flange bolts were tightened to 600 ft/lbs utilising a proper torque sequence the release terminated. The gasket was replaced at the time of the event. Tallgrass has developed site-specific procedure to include periodic inspections of the valves in vaults on a weekly basis. |
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