Incident details
Operator, cause, commodity and consequences with raw source fields.
GTG incident on 2011-08-03 — KS
Operator
Kansas Gas Service
Cause
Equipment Failure
Commodity
Natural Gas
Program
GTG
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$0
Incident datetime
2011-08-03 06:55
Report number
Location
KS
Narrative
On 8/2/11, the vent valve on the calista compressor station unit number 2 inadvertently opened when the unit was shut down by gas control at 22:10 hours. The vent valve (designated g1-025) is a 2-inch ansi 300 plug valve with a shafer air-over-hydraulics actuator. The valve is used to blow down compressor unit piping for maintenance purposes. The gas control room received alarms after shutdown from their supervisory control and data acquisition (scada) system about the open vent valve but the gas controller did not make any notification to field personnel or management. Gas vented through the vent valve at approximately 420 psig line pressure until company crews arrived at the station the next morning and heard the gas venting and closed the vent valve. Technicians unsuccessfully tried to replicate the valve failure by starting and stopping the compressor unit number 2, but the valve never opened. The exact cause of the equipment failure is unknown. All valves utilizing the air-over-hydraulic actuators were removed to prevent reoccurrence of this situation. Although equipment failure was determined to be the root cause of the incident, if the gas controller had notified field personnel in a timely manner, the amount of gas released would have been less than the 3,000 mcf reporting threshold.
Detailed record list
Report Received Date
2011-08-30 00:00:00
Iyear
2011
Report Number
20110316
Supplemental Number
15880
Report Type
Supplemental
Operator Id
31159
Name
Kansas Gas Service
Operator Street Address
7421 W 129th
Operator City Name
Overland Park
Operator State Abbreviation
KS
Operator Postal Code
66213
Local Datetime
2011-08-03 06:55:00
Location Latitude
37.631664
Location Longitude
-98.242722
Nrc Rpt Num
984756
Nrc Rpt Datetime
2011-08-03 08:43:00
Commodity Released Type
Natural Gas
Unintentional Release
10000
Intentional Release
0
Accompanying Liquid
0
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Shutdown Due Accident Ind
No
Shutdown Explain
Automated Valve Was Inadvertently Failed Open
Ignite Ind
No
Explode Ind
No
Num Pub Evacuated
0
Incident Identified Datetime
2011-08-03 06:55:00
On Site Datetime
2011-08-03 06:55:00
On Off Shore
Onshore
Onshore State Abbreviation
Ks
Onshore Postal Code
67068
Onshore City Name
Kingman
Onshore County Name
Kingman
Designated Location
Milepost
Designated Name
1604-34
Pipe Fac Name
Calista Compressor Station
Segment Name
Vent Valve G1-025
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
Valve
Valve Type
Auxiliary Or Other Valve
Installation Year
1987
Material Involved
Carbon Steel
Release Type
Other
Release Type Details
Failure Of Valve Actuator
Class Location Type
Class 3 Location
Could Be Hca
No
Pir Radius
38
Heat Damage Ind
No
Non Heat Damage Ind
No
Hca Fatalities Ind
No
Est Cost Oper Paid
0
Est Cost Unintentional Release
57100
Est Cost Intentional Release
0
Est Cost Prop Damage
0
Est Cost Emergency
0
Est Cost Other
0
Prpty
57100
Accident Psig
426
Mop Psig
740
Mop Cfr Section
Not On Omb-Approved Form When Submitted
Accident Pressure
Pressure Did Not Exceed Maop
Pressure Restriction Ind
No
Pipeline Function
Transmission System
Scada In Place Ind
Yes
Scada Operating Ind
Yes
Scada Functional Ind
Yes
Scada Detection Ind
No
Scada Conf Ind
No
Accident Identifier
Local Operating Personnel, Including Contractors
Operator Type
Operator Employee
Investigation Status
Yes, specify investigation result(s): (select all that apply)
Invest Schedule Ind
Yes
Invest Incorrect Action Ind
Yes
Employee Drug Test Ind
Yes
Contractor Drug Test Ind
No
Num Employees Tested
1
Num Employees Failed
0
Cause
Equipment Failure
Cause Details
Malfunction Of Control/relief Equipment
Eq Failure Type
Malfunction Of Control/relief Equipment
Other Control Relief Ind
Yes
Other Control Relief Details
An Actuated Valve Functioning As A Vent Valve Failed
Eq Additional Other Ind
Yes
Eq Additional Other Details
An Actuated Valve Functioning As A Vent Valve Failed
Preparer Name
R***** H******
Preparer Title
Manager Measurement And Controls
Preparer Email
R*************@o****.com
Preparer Telephone
620-728-4309
Preparer Fax
620-728-4397
Authorizer Name
L*** C*****
Authorizer Title
Director Transmission Operations
Authorizer Telephone
620-728-4302
Authorizer Email
L******@k***.com
Narrative
On 8/2/11, the vent valve on the calista compressor station unit number 2 inadvertently opened when the unit was shut down by gas control at 22:10 hours. The vent valve (designated g1-025) is a 2-inch ansi 300 plug valve with a shafer air-over-hydraulics actuator. The valve is used to blow down compressor unit piping for maintenance purposes. The gas control room received alarms after shutdown from their supervisory control and data acquisition (scada) system about the open vent valve but the gas controller did not make any notification to field personnel or management. Gas vented through the vent valve at approximately 420 psig line pressure until company crews arrived at the station the next morning and heard the gas venting and closed the vent valve. Technicians unsuccessfully tried to replicate the valve failure by starting and stopping the compressor unit number 2, but the valve never opened. The exact cause of the equipment failure is unknown. All valves utilizing the air-over-hydraulic actuators were removed to prevent reoccurrence of this situation. Although equipment failure was determined to be the root cause of the incident, if the gas controller had notified field personnel in a timely manner, the amount of gas released would have been less than the 3,000 mcf reporting threshold.
| Report Received Date | 2011-08-30 00:00:00 |
|---|---|
| Iyear | 2011 |
| Report Number | 20110316 |
| Supplemental Number | 15880 |
| Report Type | Supplemental |
| Operator Id | 31159 PHMSA Enforcement |
| Name | Kansas Gas Service |
| Operator Street Address | 7421 W 129th |
| Operator City Name | Overland Park |
| Operator State Abbreviation | KS |
| Operator Postal Code | 66213 |
| Local Datetime | 2011-08-03 06:55:00 |
| Location Latitude | 37.631664 Google Maps OpenStreetMap |
| Location Longitude | -98.242722 Google Maps OpenStreetMap |
| Nrc Rpt Num | 984756 NRC Report How to search |
| Nrc Rpt Datetime | 2011-08-03 08:43:00 |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 10000 |
| Intentional Release | 0 |
| Accompanying Liquid | 0 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Shutdown Due Accident Ind | No |
| Shutdown Explain | Automated Valve Was Inadvertently Failed Open |
| Ignite Ind | No |
| Explode Ind | No |
| Num Pub Evacuated | 0 |
| Incident Identified Datetime | 2011-08-03 06:55:00 |
| On Site Datetime | 2011-08-03 06:55:00 |
| On Off Shore | Onshore |
| Onshore State Abbreviation | Ks |
| Onshore Postal Code | 67068 |
| Onshore City Name | Kingman |
| Onshore County Name | Kingman |
| Designated Location | Milepost |
| Designated Name | 1604-34 |
| Pipe Fac Name | Calista Compressor Station |
| Segment Name | Vent Valve G1-025 |
| 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 | Valve |
| Valve Type | Auxiliary Or Other Valve |
| Installation Year | 1987 |
| Material Involved | Carbon Steel |
| Release Type | Other |
| Release Type Details | Failure Of Valve Actuator |
| Class Location Type | Class 3 Location |
| Could Be Hca | No |
| Pir Radius | 38 |
| Heat Damage Ind | No |
| Non Heat Damage Ind | No |
| Hca Fatalities Ind | No |
| Est Cost Oper Paid | 0 |
| Est Cost Unintentional Release | 57100 |
| Est Cost Intentional Release | 0 |
| Est Cost Prop Damage | 0 |
| Est Cost Emergency | 0 |
| Est Cost Other | 0 |
| Prpty | 57100 |
| Accident Psig | 426 |
| Mop Psig | 740 |
| Mop Cfr Section | Not On Omb-Approved Form When Submitted View CFR 49 §192 |
| Accident Pressure | Pressure Did Not Exceed Maop |
| Pressure Restriction Ind | No |
| Pipeline Function | Transmission System |
| Scada In Place Ind | Yes |
| Scada Operating Ind | Yes |
| Scada Functional Ind | Yes |
| Scada Detection Ind | No |
| Scada Conf Ind | No |
| Accident Identifier | Local Operating Personnel, Including Contractors |
| Operator Type | Operator Employee |
| Investigation Status | Yes, specify investigation result(s): (select all that apply) |
| Invest Schedule Ind | Yes |
| Invest Incorrect Action Ind | Yes |
| Employee Drug Test Ind | Yes |
| Contractor Drug Test Ind | No |
| Num Employees Tested | 1 |
| Num Employees Failed | 0 |
| Cause | Equipment Failure |
| Cause Details | Malfunction Of Control/relief Equipment |
| Eq Failure Type | Malfunction Of Control/relief Equipment |
| Other Control Relief Ind | Yes |
| Other Control Relief Details | An Actuated Valve Functioning As A Vent Valve Failed |
| Eq Additional Other Ind | Yes |
| Eq Additional Other Details | An Actuated Valve Functioning As A Vent Valve Failed |
| Preparer Name | R***** H****** |
| Preparer Title | Manager Measurement And Controls |
| Preparer Email | R*************@o****.com |
| Preparer Telephone | 620-728-4309 |
| Preparer Fax | 620-728-4397 |
| Authorizer Name | L*** C***** |
| Authorizer Title | Director Transmission Operations |
| Authorizer Telephone | 620-728-4302 |
| Authorizer Email | L******@k***.com |
| Narrative | On 8/2/11, the vent valve on the calista compressor station unit number 2 inadvertently opened when the unit was shut down by gas control at 22:10 hours. The vent valve (designated g1-025) is a 2-inch ansi 300 plug valve with a shafer air-over-hydraulics actuator. The valve is used to blow down compressor unit piping for maintenance purposes. The gas control room received alarms after shutdown from their supervisory control and data acquisition (scada) system about the open vent valve but the gas controller did not make any notification to field personnel or management. Gas vented through the vent valve at approximately 420 psig line pressure until company crews arrived at the station the next morning and heard the gas venting and closed the vent valve. Technicians unsuccessfully tried to replicate the valve failure by starting and stopping the compressor unit number 2, but the valve never opened. The exact cause of the equipment failure is unknown. All valves utilizing the air-over-hydraulic actuators were removed to prevent reoccurrence of this situation. Although equipment failure was determined to be the root cause of the incident, if the gas controller had notified field personnel in a timely manner, the amount of gas released would have been less than the 3,000 mcf reporting threshold. |
External Resources
PHMSA pipeline safety insights.
Product
Features
Company
All rights reserved. Copyright © by ClearPHMSA