Incident details
Operator, cause, commodity and consequences with raw source fields.
GTG incident on 2019-03-20 — NE
Operator
Northern Natural Gas Co
Cause
Natural Force Damage
Commodity
Natural Gas
Program
GTG
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$100,000
Incident datetime
2019-03-20 12:00
Report number
Location
NE
Narrative
On march 20, 2019, the ogden (iowa) field operations team was notified by the county sheriff of gas blowing under the flood waters of the des moines river near the town of lehigh, iowa. The lehigh take-off valve setting is located in this area and was completely submerged by the flood waters of the des moines, river. The leak was small enough that no loss of service occurred. The field operations team inspected the site daily to monitor the leak and check on flood water levels. The site was still under water as of april 12, 2019 but the leak was visible from shore. The butt weld below the blow off valve between the weld neck flange and tee is cracked probably due to being struck by floating ice. The weld quality is not suspected so it won't be sent to a laboratory for any further analysis. The take-off setting was totally bypassed to eliminate the leak. The section of a-line was isolated, blown down and capped. The town of lehigh, ia is being fed from the b-line.
Detailed record list
Report Received Date
2019-04-12 00:00:00
Iyear
2019
Report Number
20190042
Supplemental Number
32017
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
2019-03-20 12:00:00
Location Latitude
42.348676
Location Longitude
-94.040829
Nrc Rpt Num
1240413
Nrc Rpt Datetime
2019-03-20 16:30:00
Commodity Released Type
Natural Gas
Unintentional Release
62000
Intentional Release
0
Accompanying Liquid
0
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Shutdown Due Accident Ind
No
Shutdown Explain
Service To The Town Of Lehigh, Ia Could Be Maintained With The Leak.
Ignite Ind
No
Explode Ind
No
Num Pub Evacuated
0
Incident Identified Datetime
2019-03-20 12:00:00
On Site Datetime
2019-03-20 13:00:00
On Off Shore
Onshore
Onshore State Abbreviation
Ia
Onshore Postal Code
50557
Onshore City Name
Not Within A Municipality
Onshore County Name
Webster
Designated Location
Milepost
Designated Name
20.88
Pipe Fac Name
Ogden To Ventura
Segment Name
M520a
Federal
No
Location Type
Pipeline Right-Of-Way
Incident Area Type
Aboveground
Incident Area Subtype
Typical Aboveground Facility Piping Or Appurtenance
Crossing
No
Pipe Facility Type
Interstate
System Part Involved
Onshore Pipeline, Including Valve Sites
Item Involved
Weld/fusion, Including Heat-Affected Zone
Weld Subtype
Other Butt Weld
Installation Year
1956
Material Involved
Carbon Steel
Release Type
Leak
Leak Type
Connection Failure
Class Location Type
Class 1 Location
Could Be Hca
No
Pir Radius
70
Heat Damage Ind
No
Non Heat Damage Ind
No
Hca Fatalities Ind
No
Est Cost Oper Paid
0
Est Cost Unintentional Release
142600
Est Cost Intentional Release
0
Est Cost Prop Damage
100000
Est Cost Emergency
10000
Est Cost Other
0
Prpty
252600
Accident Psig
360
Mop Psig
380
Mop Cfr Section
192.619(C)
Accident Pressure
Pressure Did Not Exceed Maop
Pressure Restriction Ind
No
Upstream Valve Type Ind
Manual
Downstream Valve Type Ind
Manual
Length Segment Isolated
10600
Internal Inspection Ind
No
Other Inspection Ind
Yes
Internal Inspection Details
2-Inch Pipeline
Operation Complications Ind
Yes
Other Complications Ind
Yes
Inspect Comp Details
2-Inch Pipeline
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
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
The leak is so small that scada did not register a pressure drop and there was no loss of service.
Employee Drug Test Ind
No
Contractor Drug Test Ind
No
Cause
Natural Force Damage
Cause Details
Heavy Rains/floods
Natural Force Type
Heavy Rains/floods
Heavy Rains Subtype
Other
Nf Other Details
Floating Debris (Wood Or Ice) Struck Above Ground Appurtenance That Was Submerged In Flood Waters And Caused Leakage.
Nf Extreme Weather Ind
No
Preparer Name
J*** A G******
Preparer Title
Sr Corrosion Specialist - Pipeline Safety
Preparer Email
J***********@n****.com
Preparer Telephone
402-398-7494
Authorizer Name
T** C******
Authorizer Title
Vp Pipeline Safety And Risk
Authorizer Telephone
402-398-7715
Authorizer Email
T*************@n****.com
Narrative
On march 20, 2019, the ogden (iowa) field operations team was notified by the county sheriff of gas blowing under the flood waters of the des moines river near the town of lehigh, iowa. The lehigh take-off valve setting is located in this area and was completely submerged by the flood waters of the des moines, river. The leak was small enough that no loss of service occurred. The field operations team inspected the site daily to monitor the leak and check on flood water levels. The site was still under water as of april 12, 2019 but the leak was visible from shore. The butt weld below the blow off valve between the weld neck flange and tee is cracked probably due to being struck by floating ice. The weld quality is not suspected so it won't be sent to a laboratory for any further analysis. The take-off setting was totally bypassed to eliminate the leak. The section of a-line was isolated, blown down and capped. The town of lehigh, ia is being fed from the b-line.
| Report Received Date | 2019-04-12 00:00:00 |
|---|---|
| Iyear | 2019 |
| Report Number | 20190042 |
| Supplemental Number | 32017 |
| 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 | 2019-03-20 12:00:00 |
| Location Latitude | 42.348676 Google Maps OpenStreetMap |
| Location Longitude | -94.040829 Google Maps OpenStreetMap |
| Nrc Rpt Num | 1240413 NRC Report How to search |
| Nrc Rpt Datetime | 2019-03-20 16:30:00 |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 62000 |
| Intentional Release | 0 |
| Accompanying Liquid | 0 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Shutdown Due Accident Ind | No |
| Shutdown Explain | Service To The Town Of Lehigh, Ia Could Be Maintained With The Leak. |
| Ignite Ind | No |
| Explode Ind | No |
| Num Pub Evacuated | 0 |
| Incident Identified Datetime | 2019-03-20 12:00:00 |
| On Site Datetime | 2019-03-20 13:00:00 |
| On Off Shore | Onshore |
| Onshore State Abbreviation | Ia |
| Onshore Postal Code | 50557 |
| Onshore City Name | Not Within A Municipality |
| Onshore County Name | Webster |
| Designated Location | Milepost |
| Designated Name | 20.88 |
| Pipe Fac Name | Ogden To Ventura |
| Segment Name | M520a |
| Federal | No |
| Location Type | Pipeline Right-Of-Way |
| Incident Area Type | Aboveground |
| Incident Area Subtype | Typical Aboveground Facility Piping Or Appurtenance |
| Crossing | No |
| Pipe Facility Type | Interstate |
| System Part Involved | Onshore Pipeline, Including Valve Sites |
| Item Involved | Weld/fusion, Including Heat-Affected Zone |
| Weld Subtype | Other Butt Weld |
| Installation Year | 1956 |
| Material Involved | Carbon Steel |
| Release Type | Leak |
| Leak Type | Connection Failure |
| Class Location Type | Class 1 Location |
| Could Be Hca | No |
| Pir Radius | 70 |
| Heat Damage Ind | No |
| Non Heat Damage Ind | No |
| Hca Fatalities Ind | No |
| Est Cost Oper Paid | 0 |
| Est Cost Unintentional Release | 142600 |
| Est Cost Intentional Release | 0 |
| Est Cost Prop Damage | 100000 |
| Est Cost Emergency | 10000 |
| Est Cost Other | 0 |
| Prpty | 252600 |
| Accident Psig | 360 |
| Mop Psig | 380 |
| Mop Cfr Section | 192.619(C) View CFR 49 §192 |
| Accident Pressure | Pressure Did Not Exceed Maop |
| Pressure Restriction Ind | No |
| Upstream Valve Type Ind | Manual |
| Downstream Valve Type Ind | Manual |
| Length Segment Isolated | 10600 |
| Internal Inspection Ind | No |
| Other Inspection Ind | Yes |
| Internal Inspection Details | 2-Inch Pipeline |
| Operation Complications Ind | Yes |
| Other Complications Ind | Yes |
| Inspect Comp Details | 2-Inch Pipeline |
| 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 | 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 | The leak is so small that scada did not register a pressure drop and there was no loss of service. |
| Employee Drug Test Ind | No |
| Contractor Drug Test Ind | No |
| Cause | Natural Force Damage |
| Cause Details | Heavy Rains/floods |
| Natural Force Type | Heavy Rains/floods |
| Heavy Rains Subtype | Other |
| Nf Other Details | Floating Debris (Wood Or Ice) Struck Above Ground Appurtenance That Was Submerged In Flood Waters And Caused Leakage. |
| Nf Extreme Weather Ind | No |
| Preparer Name | J*** A G****** |
| Preparer Title | Sr Corrosion Specialist - Pipeline Safety |
| Preparer Email | J***********@n****.com |
| Preparer Telephone | 402-398-7494 |
| Authorizer Name | T** C****** |
| Authorizer Title | Vp Pipeline Safety And Risk |
| Authorizer Telephone | 402-398-7715 |
| Authorizer Email | T*************@n****.com |
| Narrative | On march 20, 2019, the ogden (iowa) field operations team was notified by the county sheriff of gas blowing under the flood waters of the des moines river near the town of lehigh, iowa. The lehigh take-off valve setting is located in this area and was completely submerged by the flood waters of the des moines, river. The leak was small enough that no loss of service occurred. The field operations team inspected the site daily to monitor the leak and check on flood water levels. The site was still under water as of april 12, 2019 but the leak was visible from shore. The butt weld below the blow off valve between the weld neck flange and tee is cracked probably due to being struck by floating ice. The weld quality is not suspected so it won't be sent to a laboratory for any further analysis. The take-off setting was totally bypassed to eliminate the leak. The section of a-line was isolated, blown down and capped. The town of lehigh, ia is being fed from the b-line. |
External Resources
PHMSA pipeline safety insights.
Product
Features
Company
All rights reserved. Copyright © by ClearPHMSA