Incident details
Operator, cause, commodity and consequences with raw source fields.
GTG incident on 2017-12-07 — NE
Operator
Northern Natural Gas Co
Cause
Equipment Failure
Commodity
Natural Gas
Program
GTG
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$0
Incident datetime
2017-12-07 03:57
Report number
Location
NE
Narrative
On december 7, 2017, at approximately 0357 hours, the sauk county sheriff's office notified the operations communication center that a loud noise was observed at the spring green compressor station. Operations responded and found no issues with the unit or station that would have caused a high pressure situation. The relief valve is set at 880 psig but actuated at 798 psig. The valve was disassembled for inspection and a buildup of ice in the pilot was discovered. The relief valve was repaired and placed back in service.
Detailed record list
Report Received Date
2017-12-12 00:00:00
Iyear
2017
Report Number
20170120
Supplemental Number
17529
Report Type
Supplemental Final
Operator Id
13750
Name
Northern Natural Gas Co
Operator Street Address
1111 South 103rd Street
Operator City Name
Omaha
Operator State Abbreviation
NE
Operator Postal Code
68124
Local Datetime
2017-12-07 02:15:00
Location Latitude
43.200271
Location Longitude
-90.073344
Nrc Rpt Num
1199048
Nrc Rpt Datetime
2017-12-07 08:53:00
Commodity Released Type
Natural Gas
Unintentional Release
3396
Intentional Release
0
Accompanying Liquid
0
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Shutdown Due Accident Ind
No
Shutdown Explain
Relief Valve Stopped Venting On Its Own.
Ignite Ind
No
Explode Ind
No
Num Pub Evacuated
0
Incident Identified Datetime
2017-12-07 03:57:00
On Site Datetime
2017-12-07 06:00:00
On Off Shore
Onshore
Onshore State Abbreviation
Wi
Onshore Postal Code
53588
Onshore City Name
Not Within A Municipality
Onshore County Name
Sauk
Designated Location
Milepost
Designated Name
Mp 40.75
Pipe Fac Name
179wib14601
Segment Name
New Lisbon Bl
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
Valve
Valve Type
Relief Valve
Installation Year
2014
Material Involved
Carbon Steel
Release Type
Leak
Leak Type
Seal Or Packing
Class Location Type
Class 1 Location
Could Be Hca
No
Pir Radius
259
Heat Damage Ind
No
Non Heat Damage Ind
No
Hca Fatalities Ind
No
Est Cost Oper Paid
0
Est Cost Unintentional Release
9621
Est Cost Intentional Release
0
Est Cost Prop Damage
0
Est Cost Emergency
0
Est Cost Other
0
Prpty
9621
Accident Psig
798
Mop Psig
865
Mop Cfr Section
192.619(A)(1)
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
Yes
Accident Identifier
Notification From Emergency Responder
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
There was nothing in the cause that the control room would have been able to detect.
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
Relief Valve Ind
Yes
Eq Additional Other Ind
Yes
Eq Additional Other Details
Iced Up
Preparer Name
J****** C*******
Preparer Title
Sr. Pipeline Safety Engineer
Preparer Email
J*********@n****.com
Preparer Telephone
402-398-7439
Preparer Fax
402-548-5267
Authorizer Name
T***** C******
Authorizer Title
Vice President Of Integrity And Risk
Authorizer Telephone
402-398-7715
Authorizer Email
T*************@n****.com
Narrative
On december 7, 2017, at approximately 0357 hours, the sauk county sheriff's office notified the operations communication center that a loud noise was observed at the spring green compressor station. Operations responded and found no issues with the unit or station that would have caused a high pressure situation. The relief valve is set at 880 psig but actuated at 798 psig. The valve was disassembled for inspection and a buildup of ice in the pilot was discovered. The relief valve was repaired and placed back in service.
| Report Received Date | 2017-12-12 00:00:00 |
|---|---|
| Iyear | 2017 |
| Report Number | 20170120 |
| Supplemental Number | 17529 |
| Report Type | Supplemental Final |
| Operator Id | 13750 PHMSA Enforcement |
| Name | Northern Natural Gas Co |
| Operator Street Address | 1111 South 103rd Street |
| Operator City Name | Omaha |
| Operator State Abbreviation | NE |
| Operator Postal Code | 68124 |
| Local Datetime | 2017-12-07 02:15:00 |
| Location Latitude | 43.200271 Google Maps OpenStreetMap |
| Location Longitude | -90.073344 Google Maps OpenStreetMap |
| Nrc Rpt Num | 1199048 NRC Report How to search |
| Nrc Rpt Datetime | 2017-12-07 08:53:00 |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 3396 |
| Intentional Release | 0 |
| Accompanying Liquid | 0 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Shutdown Due Accident Ind | No |
| Shutdown Explain | Relief Valve Stopped Venting On Its Own. |
| Ignite Ind | No |
| Explode Ind | No |
| Num Pub Evacuated | 0 |
| Incident Identified Datetime | 2017-12-07 03:57:00 |
| On Site Datetime | 2017-12-07 06:00:00 |
| On Off Shore | Onshore |
| Onshore State Abbreviation | Wi |
| Onshore Postal Code | 53588 |
| Onshore City Name | Not Within A Municipality |
| Onshore County Name | Sauk |
| Designated Location | Milepost |
| Designated Name | Mp 40.75 |
| Pipe Fac Name | 179wib14601 |
| Segment Name | New Lisbon Bl |
| 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 | Valve |
| Valve Type | Relief Valve |
| Installation Year | 2014 |
| Material Involved | Carbon Steel |
| Release Type | Leak |
| Leak Type | Seal Or Packing |
| Class Location Type | Class 1 Location |
| Could Be Hca | No |
| Pir Radius | 259 |
| Heat Damage Ind | No |
| Non Heat Damage Ind | No |
| Hca Fatalities Ind | No |
| Est Cost Oper Paid | 0 |
| Est Cost Unintentional Release | 9621 |
| Est Cost Intentional Release | 0 |
| Est Cost Prop Damage | 0 |
| Est Cost Emergency | 0 |
| Est Cost Other | 0 |
| Prpty | 9621 |
| Accident Psig | 798 |
| Mop Psig | 865 |
| 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 System |
| Scada In Place Ind | Yes |
| Scada Operating Ind | Yes |
| Scada Functional Ind | Yes |
| Scada Detection Ind | No |
| Scada Conf Ind | Yes |
| Accident Identifier | Notification From Emergency Responder |
| 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 | There was nothing in the cause that the control room would have been able to detect. |
| 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 |
| Relief Valve Ind | Yes |
| Eq Additional Other Ind | Yes |
| Eq Additional Other Details | Iced Up |
| Preparer Name | J****** C******* |
| Preparer Title | Sr. Pipeline Safety Engineer |
| Preparer Email | J*********@n****.com |
| Preparer Telephone | 402-398-7439 |
| Preparer Fax | 402-548-5267 |
| Authorizer Name | T***** C****** |
| Authorizer Title | Vice President Of Integrity And Risk |
| Authorizer Telephone | 402-398-7715 |
| Authorizer Email | T*************@n****.com |
| Narrative | On december 7, 2017, at approximately 0357 hours, the sauk county sheriff's office notified the operations communication center that a loud noise was observed at the spring green compressor station. Operations responded and found no issues with the unit or station that would have caused a high pressure situation. The relief valve is set at 880 psig but actuated at 798 psig. The valve was disassembled for inspection and a buildup of ice in the pilot was discovered. The relief valve was repaired and placed back in service. |
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