Incident details
Operator, cause, commodity and consequences with raw source fields.
GTG incident on 2013-03-20 — MI
Operator
Viking Gas Transmission Co
Cause
Equipment Failure
Commodity
Natural Gas
Program
GTG
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$100
Incident datetime
2013-03-20 06:29
Report number
Location
MI
Narrative
An original equipment manufacturer (oem) fitting on a 4x6 anderson-greenwood relief valve located on a reciprocating natural gas compressor discharge piping, failed on march 20, 2013 at the ada, mn compressor station, causing the unintended release of natural gas. Employees from the ada compressor station were notified of the blowing gas at approximately 6:29 a.M. By a neighbor to the compressor station. The responding employees were able to identify the problem and shut down the unit and the venting gas by 7:02 a.M. A review of the station controller log at the ada compressor station indicated that the oem fitting failed at 00:17 a.M., which allowed gas to vent for 6 hours and 45 minutes. The event was reported to the nrc in anticipation of gas loss exceeding the 3,000 mcf threshold level. A new fitting was installed to replace the failed fitting and the compressor was restored to normal service the same day. The failed fitting was sent to sherry labs for a failure analysis. The failures analysis concluded the relief valve fitting fractured through the 1/2" diameter threads of one end by uniaxial bending fatigue. The primary cause of failure appreared to be use of a material with insufficient fatigue resistant for the application. The failed fitting was a oem standard supplied fitting, which is part of the pilot sensing system. The oem has designed a new high strength, stainless steel component which will replace those existing pilots with similar relief pilot installations. This work will be completed in 2013. Over-pressure was not a contributing factor to the fitting failure.
Detailed record list
Report Received Date
2013-04-17 00:00:00
Iyear
2013
Report Number
20130035
Supplemental Number
16768
Report Type
Supplemental Final
Operator Id
21252
Name
Viking Gas Transmission Co
Operator Street Address
500 Woodward Ave Suite 2900
Operator City Name
Detroit
Operator State Abbreviation
MI
Operator Postal Code
48226
Local Datetime
2013-03-20 00:17:00
Location Latitude
47.23929
Location Longitude
-96.52427
Nrc Rpt Num
1041585
Nrc Rpt Datetime
2013-03-20 08:00:00
Commodity Released Type
Natural Gas
Unintentional Release
44059
Intentional Release
30
Accompanying Liquid
0
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Shutdown Due Accident Ind
No
Shutdown Explain
Unit #1a Was Shutdown But Other Compression Remained Online.
Ignite Ind
No
Explode Ind
No
Num Pub Evacuated
0
Incident Identified Datetime
2013-03-20 06:29:00
On Site Datetime
2013-03-20 06:43:00
On Off Shore
Onshore
Onshore State Abbreviation
Mn
Onshore Postal Code
56510
Onshore City Name
Ada
Onshore County Name
Norman
Designated Location
Milepost
Designated Name
Mp2207-1+0.0
Pipe Fac Name
Ada Compressor Station
Segment Name
Mp2207-1+0.0
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
Other
Item Involved Details
Relief Valve Pilot Sensing Line Fitting
Installation Year
1967
Material Involved
Carbon Steel
Release Type
Leak
Leak Type
Crack
Class Location Type
Class 1 Location
Could Be Hca
No
Pir Radius
315
Heat Damage Ind
No
Non Heat Damage Ind
No
Hca Fatalities Ind
No
Est Cost Oper Paid
0
Est Cost Unintentional Release
189674
Est Cost Intentional Release
0
Est Cost Prop Damage
100
Est Cost Emergency
100
Est Cost Other
0
Prpty
189874
Accident Psig
816
Mop Psig
877
Mop Cfr Section
192.619(A)(1)
Accident Pressure
Pressure Did Not Exceed Maop
Pressure Restriction Ind
No
Pipeline Function
Transmission In Storage Field
Scada In Place Ind
Yes
Scada Operating Ind
Yes
Scada Functional Ind
Yes
Scada Detection Ind
No
Scada Conf Ind
No
Accident Identifier
Notification From Public
Investigation Status
Yes, specify investigation result(s): (select all that apply)
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
Threaded Connection/coupling Failure
Eq Failure Type
Threaded Connection/coupling Failure
Other Stripped Ind
Other
Other Stripped Details
1/2" Threaded Connection On Oem Steel Cross Fitting For Relief Valve Pilot Sensing Line
Additional Defect Ind
Yes
Eq Additional Other Ind
Yes
Eq Additional Other Details
See Attached Failure Analysis Report From Sherry Labs
Preparer Name
P** V******
Preparer Title
Manager Regulatory Compliance - Dot
Preparer Email
P**********@o****.com
Preparer Telephone
918-588-7734
Preparer Fax
918-591-5032
Authorizer Name
W** D*****
Authorizer Title
Vp Natural Gas Pipeline Operations
Authorizer Telephone
918-588-7414
Authorizer Email
W*********@o****.com
Narrative
An original equipment manufacturer (oem) fitting on a 4x6 anderson-greenwood relief valve located on a reciprocating natural gas compressor discharge piping, failed on march 20, 2013 at the ada, mn compressor station, causing the unintended release of natural gas. Employees from the ada compressor station were notified of the blowing gas at approximately 6:29 a.M. By a neighbor to the compressor station. The responding employees were able to identify the problem and shut down the unit and the venting gas by 7:02 a.M. A review of the station controller log at the ada compressor station indicated that the oem fitting failed at 00:17 a.M., which allowed gas to vent for 6 hours and 45 minutes. The event was reported to the nrc in anticipation of gas loss exceeding the 3,000 mcf threshold level. A new fitting was installed to replace the failed fitting and the compressor was restored to normal service the same day. The failed fitting was sent to sherry labs for a failure analysis. The failures analysis concluded the relief valve fitting fractured through the 1/2" diameter threads of one end by uniaxial bending fatigue. The primary cause of failure appreared to be use of a material with insufficient fatigue resistant for the application. The failed fitting was a oem standard supplied fitting, which is part of the pilot sensing system. The oem has designed a new high strength, stainless steel component which will replace those existing pilots with similar relief pilot installations. This work will be completed in 2013. Over-pressure was not a contributing factor to the fitting failure.
| Report Received Date | 2013-04-17 00:00:00 |
|---|---|
| Iyear | 2013 |
| Report Number | 20130035 |
| Supplemental Number | 16768 |
| Report Type | Supplemental Final |
| Operator Id | 21252 PHMSA Enforcement |
| Name | Viking Gas Transmission Co |
| Operator Street Address | 500 Woodward Ave Suite 2900 |
| Operator City Name | Detroit |
| Operator State Abbreviation | MI |
| Operator Postal Code | 48226 |
| Local Datetime | 2013-03-20 00:17:00 |
| Location Latitude | 47.23929 Google Maps OpenStreetMap |
| Location Longitude | -96.52427 Google Maps OpenStreetMap |
| Nrc Rpt Num | 1041585 NRC Report How to search |
| Nrc Rpt Datetime | 2013-03-20 08:00:00 |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 44059 |
| Intentional Release | 30 |
| Accompanying Liquid | 0 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Shutdown Due Accident Ind | No |
| Shutdown Explain | Unit #1a Was Shutdown But Other Compression Remained Online. |
| Ignite Ind | No |
| Explode Ind | No |
| Num Pub Evacuated | 0 |
| Incident Identified Datetime | 2013-03-20 06:29:00 |
| On Site Datetime | 2013-03-20 06:43:00 |
| On Off Shore | Onshore |
| Onshore State Abbreviation | Mn |
| Onshore Postal Code | 56510 |
| Onshore City Name | Ada |
| Onshore County Name | Norman |
| Designated Location | Milepost |
| Designated Name | Mp2207-1+0.0 |
| Pipe Fac Name | Ada Compressor Station |
| Segment Name | Mp2207-1+0.0 |
| 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 | Other |
| Item Involved Details | Relief Valve Pilot Sensing Line Fitting |
| Installation Year | 1967 |
| Material Involved | Carbon Steel |
| Release Type | Leak |
| Leak Type | Crack |
| Class Location Type | Class 1 Location |
| Could Be Hca | No |
| Pir Radius | 315 |
| Heat Damage Ind | No |
| Non Heat Damage Ind | No |
| Hca Fatalities Ind | No |
| Est Cost Oper Paid | 0 |
| Est Cost Unintentional Release | 189674 |
| Est Cost Intentional Release | 0 |
| Est Cost Prop Damage | 100 |
| Est Cost Emergency | 100 |
| Est Cost Other | 0 |
| Prpty | 189874 |
| Accident Psig | 816 |
| Mop Psig | 877 |
| Mop Cfr Section | 192.619(A)(1) View CFR 49 §192 |
| Accident Pressure | Pressure Did Not Exceed Maop |
| Pressure Restriction Ind | No |
| Pipeline Function | Transmission In Storage Field |
| Scada In Place Ind | Yes |
| Scada Operating Ind | Yes |
| Scada Functional Ind | Yes |
| Scada Detection Ind | No |
| Scada Conf Ind | No |
| Accident Identifier | Notification From Public |
| Investigation Status | Yes, specify investigation result(s): (select all that apply) |
| 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 | Threaded Connection/coupling Failure |
| Eq Failure Type | Threaded Connection/coupling Failure |
| Other Stripped Ind | Other |
| Other Stripped Details | 1/2" Threaded Connection On Oem Steel Cross Fitting For Relief Valve Pilot Sensing Line |
| Additional Defect Ind | Yes |
| Eq Additional Other Ind | Yes |
| Eq Additional Other Details | See Attached Failure Analysis Report From Sherry Labs |
| Preparer Name | P** V****** |
| Preparer Title | Manager Regulatory Compliance - Dot |
| Preparer Email | P**********@o****.com |
| Preparer Telephone | 918-588-7734 |
| Preparer Fax | 918-591-5032 |
| Authorizer Name | W** D***** |
| Authorizer Title | Vp Natural Gas Pipeline Operations |
| Authorizer Telephone | 918-588-7414 |
| Authorizer Email | W*********@o****.com |
| Narrative | An original equipment manufacturer (oem) fitting on a 4x6 anderson-greenwood relief valve located on a reciprocating natural gas compressor discharge piping, failed on march 20, 2013 at the ada, mn compressor station, causing the unintended release of natural gas. Employees from the ada compressor station were notified of the blowing gas at approximately 6:29 a.M. By a neighbor to the compressor station. The responding employees were able to identify the problem and shut down the unit and the venting gas by 7:02 a.M. A review of the station controller log at the ada compressor station indicated that the oem fitting failed at 00:17 a.M., which allowed gas to vent for 6 hours and 45 minutes. The event was reported to the nrc in anticipation of gas loss exceeding the 3,000 mcf threshold level. A new fitting was installed to replace the failed fitting and the compressor was restored to normal service the same day. The failed fitting was sent to sherry labs for a failure analysis. The failures analysis concluded the relief valve fitting fractured through the 1/2" diameter threads of one end by uniaxial bending fatigue. The primary cause of failure appreared to be use of a material with insufficient fatigue resistant for the application. The failed fitting was a oem standard supplied fitting, which is part of the pilot sensing system. The oem has designed a new high strength, stainless steel component which will replace those existing pilots with similar relief pilot installations. This work will be completed in 2013. Over-pressure was not a contributing factor to the fitting failure. |
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