Incident details
Operator, cause, commodity and consequences with raw source fields.
GD incident on 2017-05-10 — WA
Operator
Cascade Natural Gas Corp
Cause
Equipment Failure
Commodity
Natural Gas
Program
GD
Damage and Injuries
0 fatalities
0 injuries
Property damage (nominal)
$5,201
Incident datetime
2017-05-10 23:41
Report number
Location
WA, SKAGIT
Narrative
On 05/10/17 at 1141, cascade natural gas corporation's customer service center received a call that the relief valve was chattering at the r18 regulator station. Cascade natural gas responded to the scene and found the system pressure elevated and the relief valve relieving gas to the atmosphere. It was determined on the scene that the r18 operating regulator failed to lock up due to excessive metal shavings in the diaphragm. While investigating the incident, a review of the pressure information for the system indicated that the system pressure has been elevated beginning mid-day 05/08/17 and continued intermittently until r18 was remediated on 05/11/17. It was also identified that a tap had been performed on an existing pipeline just upstream of the r18 regulator station on 05/08/17. Cascade natural gas believes that the performance of the tap resulted in metal shavings in the pipeline that ultimately migrated in to the diaphragm of the r18 operating regulator. The required confirmation call was made to the nrc at 18:58 on 12-may-17. The incident report number was 1178165.
Detailed record list
Occurred At
2017-05-10 23:41:00
Year
2017
Report Received Date
2017-05-30 00:00:00
Iyear
2017.0
Report Number
20170043.0
Supplemental Number
16562.0
Report Type
Supplemental Final
Operator Id
2128
Name
Cascade Natural Gas Corp
Operator Street Address
8113 W. Grandridge Blvd
Operator City Name
Kennewick
Operator State Abbreviation
WA
Operator Postal Code
99336
Local Datetime
2017-05-10 18:45:00
Location Street Address
Near Gear Raod East Of Route 99
Location City Name
Burlington
Location County Name
Skagit
Location State Abbreviation
WA
Location Postal Code
98233
Location Latitude
48.492939
Location Longitude
-122.333826
Nrc Rpt Datetime
2017-05-11 16:17:00
Nrc Rpt Num
1178094
Commodity Released Type
Natural Gas
Unintentional Release
6500.0
Fatality Ind
No
Fatal
0
Injury Ind
No
Injure
0
Ignite Ind
No
Explode Ind
No
Num Pub Evacuated
0.0
Incident Identified Datetime
2017-05-10 23:41:00
On Site Datetime
2017-05-11 00:01:00
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
Privately Owned
System Part Involved
District Regulator/metering Station
Installation Year
1975.0
Material Involved
Other
Material Details
Regulator Station Diaphragm
Release Type
Other
Release Type Details
Release Of Gas From Relief Valve
Class Location Type
Class 3 Location
Est Cost Oper Paid
0.0
Est Cost Prop Damage
5201.0
Est Cost Emergency
2323.0
Est Cost Other
0.0
Est Cost Unintentional Release
32400.0
Prpty
39924.0
Commercial Affected
0.0
Industrial Affected
0.0
Residences Affected
0.0
Accident Psig
271.0
Normal Psig
240.0
Mop Psig
249.0
Accident Pressure
Pressure Exceeded Maop, But Did Not Exceed The Applicable Allowance In 192.201
Scada In Place Ind
No
Accident Identifier
Notification From Emergency Responder
Investigation Status
No, the facility was not monitored by a controller(s) at the time of the incident
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
V**** G****
Preparer Title
Pipeline Safety Specialist
Preparer Email
V**********@c***.com
Preparer Telephone
3607882381
Preparer Fax
3607331416
Authorizer Name
C**** G******
Authorizer Title
Mgr Standards And Compliance
Authorizer Telephone
5095316427
Authorizer Email
C******************@c***.com
Narrative
On 05/10/17 at 1141, cascade natural gas corporation's customer service center received a call that the relief valve was chattering at the r18 regulator station. Cascade natural gas responded to the scene and found the system pressure elevated and the relief valve relieving gas to the atmosphere. It was determined on the scene that the r18 operating regulator failed to lock up due to excessive metal shavings in the diaphragm. While investigating the incident, a review of the pressure information for the system indicated that the system pressure has been elevated beginning mid-day 05/08/17 and continued intermittently until r18 was remediated on 05/11/17. It was also identified that a tap had been performed on an existing pipeline just upstream of the r18 regulator station on 05/08/17. Cascade natural gas believes that the performance of the tap resulted in metal shavings in the pipeline that ultimately migrated in to the diaphragm of the r18 operating regulator. The required confirmation call was made to the nrc at 18:58 on 12-may-17. The incident report number was 1178165.
| Occurred At | 2017-05-10 23:41:00 |
|---|---|
| Year | 2017 |
| Report Received Date | 2017-05-30 00:00:00 |
| Iyear | 2017.0 |
| Report Number | 20170043.0 |
| Supplemental Number | 16562.0 |
| Report Type | Supplemental Final |
| Operator Id | 2128 PHMSA Enforcement |
| Name | Cascade Natural Gas Corp |
| Operator Street Address | 8113 W. Grandridge Blvd |
| Operator City Name | Kennewick |
| Operator State Abbreviation | WA |
| Operator Postal Code | 99336 |
| Local Datetime | 2017-05-10 18:45:00 |
| Location Street Address | Near Gear Raod East Of Route 99 |
| Location City Name | Burlington |
| Location County Name | Skagit |
| Location State Abbreviation | WA |
| Location Postal Code | 98233 |
| Location Latitude | 48.492939 Google Maps OpenStreetMap |
| Location Longitude | -122.333826 Google Maps OpenStreetMap |
| Nrc Rpt Datetime | 2017-05-11 16:17:00 |
| Nrc Rpt Num | 1178094 NRC Report How to search |
| Commodity Released Type | Natural Gas |
| Unintentional Release | 6500.0 |
| Fatality Ind | No |
| Fatal | 0 |
| Injury Ind | No |
| Injure | 0 |
| Ignite Ind | No |
| Explode Ind | No |
| Num Pub Evacuated | 0.0 |
| Incident Identified Datetime | 2017-05-10 23:41:00 |
| On Site Datetime | 2017-05-11 00:01:00 |
| 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 | Privately Owned |
| System Part Involved | District Regulator/metering Station |
| Installation Year | 1975.0 |
| Material Involved | Other |
| Material Details | Regulator Station Diaphragm |
| Release Type | Other |
| Release Type Details | Release Of Gas From Relief Valve |
| Class Location Type | Class 3 Location |
| Est Cost Oper Paid | 0.0 |
| Est Cost Prop Damage | 5201.0 |
| Est Cost Emergency | 2323.0 |
| Est Cost Other | 0.0 |
| Est Cost Unintentional Release | 32400.0 |
| Prpty | 39924.0 |
| Commercial Affected | 0.0 |
| Industrial Affected | 0.0 |
| Residences Affected | 0.0 |
| Accident Psig | 271.0 |
| Normal Psig | 240.0 |
| Mop Psig | 249.0 |
| Accident Pressure | Pressure Exceeded Maop, But Did Not Exceed The Applicable Allowance In 192.201 |
| Scada In Place Ind | No |
| Accident Identifier | Notification From Emergency Responder |
| Investigation Status | No, the facility was not monitored by a controller(s) at the time of the incident |
| 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 | V**** G**** |
| Preparer Title | Pipeline Safety Specialist |
| Preparer Email | V**********@c***.com |
| Preparer Telephone | 3607882381 |
| Preparer Fax | 3607331416 |
| Authorizer Name | C**** G****** |
| Authorizer Title | Mgr Standards And Compliance |
| Authorizer Telephone | 5095316427 |
| Authorizer Email | C******************@c***.com |
| Narrative | On 05/10/17 at 1141, cascade natural gas corporation's customer service center received a call that the relief valve was chattering at the r18 regulator station. Cascade natural gas responded to the scene and found the system pressure elevated and the relief valve relieving gas to the atmosphere. It was determined on the scene that the r18 operating regulator failed to lock up due to excessive metal shavings in the diaphragm. While investigating the incident, a review of the pressure information for the system indicated that the system pressure has been elevated beginning mid-day 05/08/17 and continued intermittently until r18 was remediated on 05/11/17. It was also identified that a tap had been performed on an existing pipeline just upstream of the r18 regulator station on 05/08/17. Cascade natural gas believes that the performance of the tap resulted in metal shavings in the pipeline that ultimately migrated in to the diaphragm of the r18 operating regulator. The required confirmation call was made to the nrc at 18:58 on 12-may-17. The incident report number was 1178165. |
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