Incident details
Operator, cause, commodity and consequences with raw source fields.
GTG incident on 2022-11-18 — TX
Operator
Colorado Interstate Gas Co
Cause
Equipment Failure
Commodity
Natural Gas
Program
GTG
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$500
Incident datetime
2022-11-18 22:13
Report number
Location
TX
Narrative
On 11/18/2022, at 09:37, a 3 inch emergency shut down (esd) valve unintentionally opened at the colorado interstate gas (cig), muddy gap compressors station. At 22:14, cig gas control called the field operator on duty and communicated that pressure was trending down and a vent valve may be open at the muddy gap compressor station. At 23:30, cig field operator arrived on site and discovered an esd valve was open. The operator closed the valve. The incident was deemed reportable. The nrc notification was issued, and the internal investigation started. The internal investigation concluded that the esd valve solenoid failed due to an accumulation of water and debris from the station supply air system that froze causing the valve to operate abnormally sending a pneumatic open signal to the esd valve. In addition, the valve status was not in scada and the controllers did not get an alarm notifying them that the vent valve was open. In order to prevent reoccurrence cig operations cleaned and re-tested the valve solenoid. Operations is reviewing processes and preventive maintenance measures to verify that the muddy gap cs supplied air systems are dry throughout the entire system. In addition, operations added valve status plc logic alarms in scada for the muddy gap esd valves.
Detailed record list
Report Received Date
2022-12-18 00:00:00
Iyear
2022
Report Number
20220132
Supplemental Number
37592
Report Type
Supplemental Final
Operator Id
2564
Name
Colorado Interstate Gas Co
Operator Street Address
1001 Louisiana St, Suite 1000
Operator City Name
Houston
Operator State Abbreviation
TX
Operator Postal Code
77002
Local Datetime
2022-11-18 10:05:00
Time Zone
Mountain
Daylight Savings Ind
No
Location Latitude
42.37573677
Location Longitude
-107.4267553
Nrc Rpt Num
1352961
Nrc Rpt Datetime
2022-11-19 23:52:00
Additional Nrc Report Numbers
1353040
Commodity Released Type
Natural Gas
Unintentional Release
59321
Intentional Release
0
Accompanying Liquid
0
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Status When Identified
Idle
Communication State Fed Ind
No
Ignite Ind
No
Num Pub Evacuated
0
Incident Identified Datetime
2022-11-18 22:13:00
On Site Datetime
2022-11-18 23:20:00
On Off Shore
Onshore
Onshore State Abbreviation
Wy
Onshore Postal Code
82301
Onshore City Name
Muddy Gap
Onshore County Name
Carbon
Designated Location
Not Applicable
Pipe Fac Name
Muddy Gap Compressor Station
Segment Name
Muddy Gap Compressor Station
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
Interstate
System Part Involved
Onshore Compressor Station Equipment And Piping
Item Involved
Esd System, But Excluding Product Drain Lines And Tubing
Installation Year
2001
Manufactured Year
Unknown
Material Involved
Carbon Steel
Release Type
Leak
Leak Type
Other
Leak Type Other
Vent Valve Opened
Class Location Type
Class 1 Location
Could Be Hca
No
Pir Radius
406
Heat Damage Ind
No
Non Heat Damage Ind
No
Did Occur In Mca Ind
No
Est Cost Oper Paid
0
Est Cost Unintentional Release
335164
Est Cost Intentional Release
0
Est Cost Prop Damage
500
Est Cost Emergency
300
Est Cost Other
0
Gas Cost In Mcf
5.65
Prpty
335964
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
798
Gas Flow In Pipe In Mcf
0
Mop Psig
1100
Mop Cfr Section
192.619(A)(1)
Maop Established Date
1977-11-21 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
Transmission System
Scada In Place Ind
Yes
Scada Operating Ind
Yes
Scada Functional Ind
Yes
Scada Detection Ind
Yes
Scada Conf Ind
No
Accident Identifier
Controller
Operator Type
Operator Employee
Investigation Status
Yes, specify investigation result(s): (select all that apply)
Invest No Control Room Ind
Yes
Invest No Controller Ind
Yes
Employee Drug Test Ind
No
Contractor Drug Test Ind
No
Cause
Equipment Failure
Cause Details
Malfunction Of Control/relief Equipment
Eq Failure Type
Malfunction Of Control/relief Equipment
Esd System Failure Ind
Yes
Eq Additional Other Ind
Yes
Eq Additional Other Details
Esd Valve Solenoid Failed Due To Debris Accumulation
Preparer Name
J**** L****
Preparer Email
J**********@k***********.com
Preparer Telephone
7134204675
Authorizer Name
J**** H********
Authorizer Telephone
17133699443
Authorizer Email
J**************@k***********.com
Narrative
On 11/18/2022, at 09:37, a 3 inch emergency shut down (esd) valve unintentionally opened at the colorado interstate gas (cig), muddy gap compressors station. At 22:14, cig gas control called the field operator on duty and communicated that pressure was trending down and a vent valve may be open at the muddy gap compressor station. At 23:30, cig field operator arrived on site and discovered an esd valve was open. The operator closed the valve. The incident was deemed reportable. The nrc notification was issued, and the internal investigation started. The internal investigation concluded that the esd valve solenoid failed due to an accumulation of water and debris from the station supply air system that froze causing the valve to operate abnormally sending a pneumatic open signal to the esd valve. In addition, the valve status was not in scada and the controllers did not get an alarm notifying them that the vent valve was open. In order to prevent reoccurrence cig operations cleaned and re-tested the valve solenoid. Operations is reviewing processes and preventive maintenance measures to verify that the muddy gap cs supplied air systems are dry throughout the entire system. In addition, operations added valve status plc logic alarms in scada for the muddy gap esd valves.
| Report Received Date | 2022-12-18 00:00:00 |
|---|---|
| Iyear | 2022 |
| Report Number | 20220132 |
| Supplemental Number | 37592 |
| Report Type | Supplemental Final |
| Operator Id | 2564 PHMSA Enforcement |
| Name | Colorado Interstate Gas Co |
| Operator Street Address | 1001 Louisiana St, Suite 1000 |
| Operator City Name | Houston |
| Operator State Abbreviation | TX |
| Operator Postal Code | 77002 |
| Local Datetime | 2022-11-18 10:05:00 |
| Time Zone | Mountain |
| Daylight Savings Ind | No |
| Location Latitude | 42.37573677 Google Maps OpenStreetMap |
| Location Longitude | -107.4267553 Google Maps OpenStreetMap |
| Nrc Rpt Num | 1352961 NRC Report How to search |
| Nrc Rpt Datetime | 2022-11-19 23:52:00 |
| Additional Nrc Report Numbers | 1353040 |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 59321 |
| Intentional Release | 0 |
| Accompanying Liquid | 0 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Status When Identified | Idle |
| Communication State Fed Ind | No |
| Ignite Ind | No |
| Num Pub Evacuated | 0 |
| Incident Identified Datetime | 2022-11-18 22:13:00 |
| On Site Datetime | 2022-11-18 23:20:00 |
| On Off Shore | Onshore |
| Onshore State Abbreviation | Wy |
| Onshore Postal Code | 82301 |
| Onshore City Name | Muddy Gap |
| Onshore County Name | Carbon |
| Designated Location | Not Applicable |
| Pipe Fac Name | Muddy Gap Compressor Station |
| Segment Name | Muddy Gap Compressor Station |
| 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 | Interstate |
| System Part Involved | Onshore Compressor Station Equipment And Piping |
| Item Involved | Esd System, But Excluding Product Drain Lines And Tubing |
| Installation Year | 2001 |
| Manufactured Year | Unknown |
| Material Involved | Carbon Steel |
| Release Type | Leak |
| Leak Type | Other |
| Leak Type Other | Vent Valve Opened |
| Class Location Type | Class 1 Location |
| Could Be Hca | No |
| Pir Radius | 406 |
| Heat Damage Ind | No |
| Non Heat Damage Ind | No |
| Did Occur In Mca Ind | No |
| Est Cost Oper Paid | 0 |
| Est Cost Unintentional Release | 335164 |
| Est Cost Intentional Release | 0 |
| Est Cost Prop Damage | 500 |
| Est Cost Emergency | 300 |
| Est Cost Other | 0 |
| Gas Cost In Mcf | 5.65 |
| Prpty | 335964 |
| 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 | 798 |
| Gas Flow In Pipe In Mcf | 0 |
| Mop Psig | 1100 |
| Mop Cfr Section | 192.619(A)(1) View CFR 49 §192 |
| Maop Established Date | 1977-11-21 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 | Transmission System |
| Scada In Place Ind | Yes |
| Scada Operating Ind | Yes |
| Scada Functional Ind | Yes |
| Scada Detection Ind | Yes |
| Scada Conf Ind | No |
| Accident Identifier | Controller |
| Operator Type | Operator Employee |
| Investigation Status | Yes, specify investigation result(s): (select all that apply) |
| Invest No Control Room Ind | Yes |
| Invest No Controller Ind | Yes |
| Employee Drug Test Ind | No |
| Contractor Drug Test Ind | No |
| Cause | Equipment Failure |
| Cause Details | Malfunction Of Control/relief Equipment |
| Eq Failure Type | Malfunction Of Control/relief Equipment |
| Esd System Failure Ind | Yes |
| Eq Additional Other Ind | Yes |
| Eq Additional Other Details | Esd Valve Solenoid Failed Due To Debris Accumulation |
| Preparer Name | J**** L**** |
| Preparer Email | J**********@k***********.com |
| Preparer Telephone | 7134204675 |
| Authorizer Name | J**** H******** |
| Authorizer Telephone | 17133699443 |
| Authorizer Email | J**************@k***********.com |
| Narrative | On 11/18/2022, at 09:37, a 3 inch emergency shut down (esd) valve unintentionally opened at the colorado interstate gas (cig), muddy gap compressors station. At 22:14, cig gas control called the field operator on duty and communicated that pressure was trending down and a vent valve may be open at the muddy gap compressor station. At 23:30, cig field operator arrived on site and discovered an esd valve was open. The operator closed the valve. The incident was deemed reportable. The nrc notification was issued, and the internal investigation started. The internal investigation concluded that the esd valve solenoid failed due to an accumulation of water and debris from the station supply air system that froze causing the valve to operate abnormally sending a pneumatic open signal to the esd valve. In addition, the valve status was not in scada and the controllers did not get an alarm notifying them that the vent valve was open. In order to prevent reoccurrence cig operations cleaned and re-tested the valve solenoid. Operations is reviewing processes and preventive maintenance measures to verify that the muddy gap cs supplied air systems are dry throughout the entire system. In addition, operations added valve status plc logic alarms in scada for the muddy gap esd valves. |
External Resources
PHMSA pipeline safety insights.
Product
Features
Company
All rights reserved. Copyright © by ClearPHMSA