Incident details
Operator, cause, commodity and consequences with raw source fields.
GTG incident on 2024-11-26 — OK
Operator
Rocky Mountain Midstream Llc
Cause
Incorrect Operation
Commodity
Natural Gas
Program
GTG
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$0
Incident datetime
2024-11-26 00:00 UTC
Report number
Location
OK
Narrative
On october 31st, 2024, at approximately 2:00 am mst, williams had a caterpillar 3606 compressor unit (unit) go down at the lochbuie compressor station ("facility"). The 3rd party leased compressor supplier, kodiak gas services (kodiak), had an operation technician go to the site and restart the unit, which requires a purge to safely bring the unit back online. For the site-specific unit purge, natural gas is vented to atmosphere from a 2" blowdown valve through a silencer stack. After the unit is completely purged, kodiak's startup process is to close the blowdown valve before loading the unit; however, the kodiak technician did not perform this step and after loading the unit at approximately 4:00 am mst, the kodiak technician left the facility. Williams noticed that the facility's volume throughput was less than when the unit was running earlier, but there was no indication of a leak nor of an issue on going. Williams continued its investigation through the day of october 31st. At approximately 4:00 pm mst a williams operation technician identified the improper valve alignment of the 2" blowdown valve (valve in open position) and realized that it was the cause of the facility's volume throughput decrease. The operations technician immediately closed the valve.
Detailed record list
Report Received Date
2024-11-26 00:00:00
Iyear
2024
Report Number
20240130
Supplemental Number
40544
Report Type
Supplemental Final
Operator Id
39710
Name
Rocky Mountain Midstream Llc
Operator Street Address
One Williams Center
Operator City Name
Tulsa
Operator State Abbreviation
OK
Operator Postal Code
74172
Time Zone
Mountain
Daylight Savings Ind
No
Location Latitude
40.035858
Location Longitude
-104.672349
Nrc Rpt Num
1416921
Additional Nrc Report Numbers
1417062
Commodity Released Type
Natural Gas
Unintentional Release
6450
Intentional Release
0
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
No
Shutdown Explain
Inadvertent Valve That Was Left Open Was Closed, Not Requiring Shutdown.
Communication State Fed Ind
No
Ignite Ind
No
Num Pub Evacuated
0
On Off Shore
Onshore
Onshore State Abbreviation
Co
Onshore Postal Code
80642
Onshore City Name
Lochbuie
Onshore County Name
Weld
Designated Location
Not Applicable
Pipe Fac Name
Lochbuie Cs
Federal
No
Location Type
Operator-Controlled Property
Incident Area Type
Aboveground
Incident Area Subtype
Typical Aboveground Facility Piping Or Appurtenance
Crossing
No
Pipe Facility Type
Intrastate
System Part Involved
Onshore Compressor Station Equipment And Piping
Item Involved
Compressor
Installation Year
2019
Manufactured Year
2019
Material Involved
Carbon Steel
Release Type
Other
Release Type Details
Inadvertent Valve Left Open.
Class Location Type
Class 1 Location
Could Be Hca
No
Pir Radius
660
Heat Damage Ind
No
Non Heat Damage Ind
No
Did Occur In Mca Ind
No
Est Cost Oper Paid
0
Est Cost Unintentional Release
14190
Est Cost Intentional Release
0
Est Cost Prop Damage
0
Est Cost Emergency
0
Est Cost Other
0
Gas Cost In Mcf
2.2
Prpty
14190
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
918
Gas Flow In Pipe In Mcf
6625
Mop Psig
1440
Mop Cfr Section
192.619(A)(1)
Maop Established Date
2019-06-27 00:00:00
Maop Reversal Flow Ind
No
Accident Pressure
Pressure Did Not Exceed Maop
Pressure Restriction Ind
No
Gas Required Odorized Ind
No
Pipeline Function
Type C Gathering
Scada In Place Ind
Yes
Scada Operating Ind
Yes
Scada Functional Ind
Yes
Scada Detection Ind
No
Scada Conf Ind
Yes
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
No initial indication (alarm, etc..) of an issue had occur.
Employee Drug Test Ind
No
Contractor Drug Test Ind
No
Cause
Incorrect Operation
Cause Details
Valve Left Or Placed In Wrong Position, But Not Resulting In An Overpressure
Operation Type
Valve Left Or Placed In Wrong Position, But Not Resulting In An Overpressure
Related Inadequate Proc Ind
Yes
Category Type
Other Maintenance
Operator Qualification Ind
No
Io Valve Position Ind
Yes
Preparer Name
L***** H***
Preparer Title
Pipeline Safety Manager
Preparer Email
L**********@w*******.com
Preparer Telephone
9182404259
Local Contact Name
D**** T******
Local Contact Email
D************@w*******.com
Local Contact Telephone
9182841208
Authorizer Name
L***** H***
Authorizer Title
Pipeline Safety Manager
Authorizer Telephone
9182404259
Authorizer Email
L**********@w*******.com
Narrative
On october 31st, 2024, at approximately 2:00 am mst, williams had a caterpillar 3606 compressor unit (unit) go down at the lochbuie compressor station ("facility"). The 3rd party leased compressor supplier, kodiak gas services (kodiak), had an operation technician go to the site and restart the unit, which requires a purge to safely bring the unit back online. For the site-specific unit purge, natural gas is vented to atmosphere from a 2" blowdown valve through a silencer stack. After the unit is completely purged, kodiak's startup process is to close the blowdown valve before loading the unit; however, the kodiak technician did not perform this step and after loading the unit at approximately 4:00 am mst, the kodiak technician left the facility. Williams noticed that the facility's volume throughput was less than when the unit was running earlier, but there was no indication of a leak nor of an issue on going. Williams continued its investigation through the day of october 31st. At approximately 4:00 pm mst a williams operation technician identified the improper valve alignment of the 2" blowdown valve (valve in open position) and realized that it was the cause of the facility's volume throughput decrease. The operations technician immediately closed the valve.
| Report Received Date | 2024-11-26 00:00:00 |
|---|---|
| Iyear | 2024 |
| Report Number | 20240130 |
| Supplemental Number | 40544 |
| Report Type | Supplemental Final |
| Operator Id | 39710 PHMSA Enforcement |
| Name | Rocky Mountain Midstream Llc |
| Operator Street Address | One Williams Center |
| Operator City Name | Tulsa |
| Operator State Abbreviation | OK |
| Operator Postal Code | 74172 |
| Time Zone | Mountain |
| Daylight Savings Ind | No |
| Location Latitude | 40.035858 Google Maps OpenStreetMap |
| Location Longitude | -104.672349 Google Maps OpenStreetMap |
| Nrc Rpt Num | 1416921 NRC Report How to search |
| Additional Nrc Report Numbers | 1417062 |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 6450 |
| Intentional Release | 0 |
| 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 | No |
| Shutdown Explain | Inadvertent Valve That Was Left Open Was Closed, Not Requiring Shutdown. |
| Communication State Fed Ind | No |
| Ignite Ind | No |
| Num Pub Evacuated | 0 |
| On Off Shore | Onshore |
| Onshore State Abbreviation | Co |
| Onshore Postal Code | 80642 |
| Onshore City Name | Lochbuie |
| Onshore County Name | Weld |
| Designated Location | Not Applicable |
| Pipe Fac Name | Lochbuie Cs |
| Federal | No |
| Location Type | Operator-Controlled Property |
| Incident Area Type | Aboveground |
| Incident Area Subtype | Typical Aboveground Facility Piping Or Appurtenance |
| Crossing | No |
| Pipe Facility Type | Intrastate |
| System Part Involved | Onshore Compressor Station Equipment And Piping |
| Item Involved | Compressor |
| Installation Year | 2019 |
| Manufactured Year | 2019 |
| Material Involved | Carbon Steel |
| Release Type | Other |
| Release Type Details | Inadvertent Valve Left Open. |
| Class Location Type | Class 1 Location |
| Could Be Hca | No |
| Pir Radius | 660 |
| Heat Damage Ind | No |
| Non Heat Damage Ind | No |
| Did Occur In Mca Ind | No |
| Est Cost Oper Paid | 0 |
| Est Cost Unintentional Release | 14190 |
| Est Cost Intentional Release | 0 |
| Est Cost Prop Damage | 0 |
| Est Cost Emergency | 0 |
| Est Cost Other | 0 |
| Gas Cost In Mcf | 2.2 |
| Prpty | 14190 |
| 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 | 918 |
| Gas Flow In Pipe In Mcf | 6625 |
| Mop Psig | 1440 |
| Mop Cfr Section | 192.619(A)(1) View CFR 49 §192 |
| Maop Established Date | 2019-06-27 00:00:00 |
| Maop Reversal Flow Ind | No |
| Accident Pressure | Pressure Did Not Exceed Maop |
| Pressure Restriction Ind | No |
| Gas Required Odorized Ind | No |
| Pipeline Function | Type C Gathering |
| Scada In Place Ind | Yes |
| Scada Operating Ind | Yes |
| Scada Functional Ind | Yes |
| Scada Detection Ind | No |
| Scada Conf Ind | Yes |
| 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 | No initial indication (alarm, etc..) of an issue had occur. |
| Employee Drug Test Ind | No |
| Contractor Drug Test Ind | No |
| Cause | Incorrect Operation |
| Cause Details | Valve Left Or Placed In Wrong Position, But Not Resulting In An Overpressure |
| Operation Type | Valve Left Or Placed In Wrong Position, But Not Resulting In An Overpressure |
| Related Inadequate Proc Ind | Yes |
| Category Type | Other Maintenance |
| Operator Qualification Ind | No |
| Io Valve Position Ind | Yes |
| Preparer Name | L***** H*** |
| Preparer Title | Pipeline Safety Manager |
| Preparer Email | L**********@w*******.com |
| Preparer Telephone | 9182404259 |
| Local Contact Name | D**** T****** |
| Local Contact Email | D************@w*******.com |
| Local Contact Telephone | 9182841208 |
| Authorizer Name | L***** H*** |
| Authorizer Title | Pipeline Safety Manager |
| Authorizer Telephone | 9182404259 |
| Authorizer Email | L**********@w*******.com |
| Narrative | On october 31st, 2024, at approximately 2:00 am mst, williams had a caterpillar 3606 compressor unit (unit) go down at the lochbuie compressor station ("facility"). The 3rd party leased compressor supplier, kodiak gas services (kodiak), had an operation technician go to the site and restart the unit, which requires a purge to safely bring the unit back online. For the site-specific unit purge, natural gas is vented to atmosphere from a 2" blowdown valve through a silencer stack. After the unit is completely purged, kodiak's startup process is to close the blowdown valve before loading the unit; however, the kodiak technician did not perform this step and after loading the unit at approximately 4:00 am mst, the kodiak technician left the facility. Williams noticed that the facility's volume throughput was less than when the unit was running earlier, but there was no indication of a leak nor of an issue on going. Williams continued its investigation through the day of october 31st. At approximately 4:00 pm mst a williams operation technician identified the improper valve alignment of the 2" blowdown valve (valve in open position) and realized that it was the cause of the facility's volume throughput decrease. The operations technician immediately closed the valve. |
External Resources
PHMSA pipeline safety insights.
Product
Features
Company
All rights reserved. Copyright © by ClearPHMSA