Incident details
Operator, cause, commodity and consequences with raw source fields.
GD incident on 2016-02-07 — ID
Operator
Intermountain Gas Co
Cause
Equipment Failure
Commodity
Natural Gas
Program
GD
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$250
Incident datetime
2016-02-07 08:15
Report number
Location
ID, BINGHAM
Narrative
Small debris in the regulator punctured the diaphragm which caused the regulator to fail wide open. Normal control pressure is 245 psig and upstream pressure was approximately 650 psig. This resulted in the relief to open and blow to atmosphere. The relief is set to start opening at 265 psig and it built to 272 psig during full relief. Due to piping configuration this resulted in approximately 280 psig out of the regulator and pressure losses in the pipe up to the relief. All piping downstream of the relief did not see more than 272 psig. Only 30' piping was subjected to the 110% maop pressure. Operator personnel arrived on site and promptly shut in the regulator that failed by using an upstream isolation valve. The station has a redundant regulator that maintained feed into the system. The relief was rebuilt and put back into service. Igc requested this incident be retracted, and was denied by brian pierzina, PHMSA accident investigator. Igc disagrees with this decision and is working with ingaa, who is seeking clarification from PHMSA leadership on the definition of an incident, since the rulemaking language in 2010 supports that regulator station relief's in excess of 3m cubic feet should not be reported as incidents. -lance elroy, igc director of operations. 2-8-18.
Detailed record list
Occurred At
2016-02-07 08:15:00
Year
2016
Report Received Date
2016-02-17 00:00:00
Iyear
2016.0
Report Number
20160014.0
Supplemental Number
16793.0
Report Type
Supplemental Final
Operator Id
8160
Name
Intermountain Gas Co
Operator Street Address
555 South Cole Road
Operator City Name
Boise
Operator State Abbreviation
ID
Operator Postal Code
83709
Local Datetime
2016-02-07 08:00:00
Location Street Address
51 S. Thompson Rd
Location City Name
Blackfoot
Location County Name
Bingham
Location State Abbreviation
ID
Location Postal Code
83221
Location Latitude
43.18643
Location Longitude
-112.296287
Nrc Rpt Datetime
2016-02-11 14:32:00
Nrc Rpt Num
1140286
Commodity Released Type
Natural Gas
Unintentional Release
3065.5
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Ignite Ind
No
Explode Ind
No
Num Pub Evacuated
0.0
Incident Identified Datetime
2016-02-07 08:15:00
On Site Datetime
2016-02-07 09:30:00
Federal
No
Location Type
Operator-Controlled Property
Incident Area Type
Aboveground
Incident Area Subtype
Typical Aboveground Facility Piping Or Appurtenance (E.g. Value Or Regulator Station, Outdoor Meter Set)
Crossing
No
Pipe Facility Type
Investor Owned
System Part Involved
District Regulator/metering Station
Installation Year
1972.0
Material Involved
Other
Material Details
Regulator - Debris Failure In Reg
Release Type
Other
Release Type Details
Regulator Had Debris Damage The Diaphragm Which Caused It To Fail Wide Open. This Caused The Relief To Open. The Size Of Regulator, Relief And Pressure Conditions Caused The Excessive Gas Loss.
Class Location Type
Class 3 Location
Est Cost Oper Paid
0.0
Est Cost Prop Damage
250.0
Est Cost Emergency
546.0
Est Cost Other
0.0
Est Cost Unintentional Release
17869.0
Prpty
18665.0
Commercial Affected
0.0
Industrial Affected
0.0
Residences Affected
0.0
Accident Psig
280.0
Normal Psig
245.0
Mop Psig
250.0
Accident Pressure
Pressure Exceeded The Applicable Allowance In 192.201
Scada In Place Ind
Yes
Scada Operating Ind
Yes
Scada Functional Ind
Yes
Scada Detection Ind
Yes
Scada Conf Ind
Yes
Accident Identifier
Scada-Based Information (Such As Alarm(S), Alert(S), Event(S), And/or Volume Or Pack Calculations)
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
Scada worked as intended, alarm due to high pressure
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
Pressure Regulator Ind
Yes
Preparer Name
T**** M******
Preparer Title
Engineer Iii
Preparer Email
T************@i*****.com
Preparer Telephone
208-377-6044
Authorizer Name
L**** E****
Authorizer Title
Director - Operations Services
Authorizer Telephone
208-377-6122
Authorizer Email
L**********@i*****.com
Narrative
Small debris in the regulator punctured the diaphragm which caused the regulator to fail wide open. Normal control pressure is 245 psig and upstream pressure was approximately 650 psig. This resulted in the relief to open and blow to atmosphere. The relief is set to start opening at 265 psig and it built to 272 psig during full relief. Due to piping configuration this resulted in approximately 280 psig out of the regulator and pressure losses in the pipe up to the relief. All piping downstream of the relief did not see more than 272 psig. Only 30' piping was subjected to the 110% maop pressure. Operator personnel arrived on site and promptly shut in the regulator that failed by using an upstream isolation valve. The station has a redundant regulator that maintained feed into the system. The relief was rebuilt and put back into service. Igc requested this incident be retracted, and was denied by brian pierzina, PHMSA accident investigator. Igc disagrees with this decision and is working with ingaa, who is seeking clarification from PHMSA leadership on the definition of an incident, since the rulemaking language in 2010 supports that regulator station relief's in excess of 3m cubic feet should not be reported as incidents. -lance elroy, igc director of operations. 2-8-18.
| Occurred At | 2016-02-07 08:15:00 |
|---|---|
| Year | 2016 |
| Report Received Date | 2016-02-17 00:00:00 |
| Iyear | 2016.0 |
| Report Number | 20160014.0 |
| Supplemental Number | 16793.0 |
| Report Type | Supplemental Final |
| Operator Id | 8160 PHMSA Enforcement |
| Name | Intermountain Gas Co |
| Operator Street Address | 555 South Cole Road |
| Operator City Name | Boise |
| Operator State Abbreviation | ID |
| Operator Postal Code | 83709 |
| Local Datetime | 2016-02-07 08:00:00 |
| Location Street Address | 51 S. Thompson Rd |
| Location City Name | Blackfoot |
| Location County Name | Bingham |
| Location State Abbreviation | ID |
| Location Postal Code | 83221 |
| Location Latitude | 43.18643 Google Maps OpenStreetMap |
| Location Longitude | -112.296287 Google Maps OpenStreetMap |
| Nrc Rpt Datetime | 2016-02-11 14:32:00 |
| Nrc Rpt Num | 1140286 NRC Report How to search |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 3065.5 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Ignite Ind | No |
| Explode Ind | No |
| Num Pub Evacuated | 0.0 |
| Incident Identified Datetime | 2016-02-07 08:15:00 |
| On Site Datetime | 2016-02-07 09:30:00 |
| Federal | No |
| Location Type | Operator-Controlled Property |
| Incident Area Type | Aboveground |
| Incident Area Subtype | Typical Aboveground Facility Piping Or Appurtenance (E.g. Value Or Regulator Station, Outdoor Meter Set) |
| Crossing | No |
| Pipe Facility Type | Investor Owned |
| System Part Involved | District Regulator/metering Station |
| Installation Year | 1972.0 |
| Material Involved | Other |
| Material Details | Regulator - Debris Failure In Reg |
| Release Type | Other |
| Release Type Details | Regulator Had Debris Damage The Diaphragm Which Caused It To Fail Wide Open. This Caused The Relief To Open. The Size Of Regulator, Relief And Pressure Conditions Caused The Excessive Gas Loss. |
| Class Location Type | Class 3 Location |
| Est Cost Oper Paid | 0.0 |
| Est Cost Prop Damage | 250.0 |
| Est Cost Emergency | 546.0 |
| Est Cost Other | 0.0 |
| Est Cost Unintentional Release | 17869.0 |
| Prpty | 18665.0 |
| Commercial Affected | 0.0 |
| Industrial Affected | 0.0 |
| Residences Affected | 0.0 |
| Accident Psig | 280.0 |
| Normal Psig | 245.0 |
| Mop Psig | 250.0 |
| Accident Pressure | Pressure Exceeded The Applicable Allowance In 192.201 |
| Scada In Place Ind | Yes |
| Scada Operating Ind | Yes |
| Scada Functional Ind | Yes |
| Scada Detection Ind | Yes |
| Scada Conf Ind | Yes |
| Accident Identifier | Scada-Based Information (Such As Alarm(S), Alert(S), Event(S), And/or Volume Or Pack Calculations) |
| 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 | Scada worked as intended, alarm due to high pressure |
| 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 |
| Pressure Regulator Ind | Yes |
| Preparer Name | T**** M****** |
| Preparer Title | Engineer Iii |
| Preparer Email | T************@i*****.com |
| Preparer Telephone | 208-377-6044 |
| Authorizer Name | L**** E**** |
| Authorizer Title | Director - Operations Services |
| Authorizer Telephone | 208-377-6122 |
| Authorizer Email | L**********@i*****.com |
| Narrative | Small debris in the regulator punctured the diaphragm which caused the regulator to fail wide open. Normal control pressure is 245 psig and upstream pressure was approximately 650 psig. This resulted in the relief to open and blow to atmosphere. The relief is set to start opening at 265 psig and it built to 272 psig during full relief. Due to piping configuration this resulted in approximately 280 psig out of the regulator and pressure losses in the pipe up to the relief. All piping downstream of the relief did not see more than 272 psig. Only 30' piping was subjected to the 110% maop pressure. Operator personnel arrived on site and promptly shut in the regulator that failed by using an upstream isolation valve. The station has a redundant regulator that maintained feed into the system. The relief was rebuilt and put back into service. Igc requested this incident be retracted, and was denied by brian pierzina, PHMSA accident investigator. Igc disagrees with this decision and is working with ingaa, who is seeking clarification from PHMSA leadership on the definition of an incident, since the rulemaking language in 2010 supports that regulator station relief's in excess of 3m cubic feet should not be reported as incidents. -lance elroy, igc director of operations. 2-8-18. |
External Resources
PHMSA pipeline safety insights.
Product
Features
Company
All rights reserved. Copyright © by ClearPHMSA