NORTHWEST PIPELINE LLC
gas_transmission Incident —
Incident Information
| Report Date | — |
| Operator | NORTHWEST PIPELINE LLC |
| Commodity | — |
| Pipeline Type | gas_transmission |
Location
| State | |
| Coordinates | 45.77131, -120.79931 |
Cause
| Cause | EQUIPMENT FAILURE |
| Subcause | — |
Casualties
| Fatalities | 0 |
| Injuries | 0 |
Costs
| Property Damage | — |
| Lost Commodity | — |
| Public/Private Damage | — |
| Emergency Response | — |
| Environmental Remediation | — |
| Other Costs | — |
Location Map
Incident Narrative
ON AUGUST 18TH AT APPROXIMATELY 17:00 CST GAS CONTROL WAS REMOTE STARTING UNIT 1 AT THE GOLDENDALE COMPRESSOR STATION. AT 17:03 AN A/C POWER FAILURE ALARM WAS RECEIVED AND THE UNIT SHUTDOWN ON LOW PRESSURE. AT 17:21 AN ALARM FOR UNEXPECTED GAS VENTING WAS RECEIVED. LOCAL OPERATIONS WAS NOTIFIED. DUE TO RESPONSE TIME GAS CONTROL WORKED TO REMOTELY REDUCE PRESSURE. WHEN THAT WAS UNSUCCESSFUL STATION WAS REMOTELY ISOLATED AND THE RELEASE WAS STOPPED BY 18:15. INITIAL ESTIMATE OF VOLUME RELEASED WAS 10 MSCFD, WHICH WAS BELOW THE REPORTING THRESHOLD. WHEN RECHECKING THE CALCULATION FOR ENVIRONMENTAL REPORTING AND THE VOLUME RELEASE ESTIMATED AT 6,000 MSCFD. THIS RESULTED IN THE NEED TO REPORT. FAILURE TO REPORT WAS DUE TO INTERNAL MISCOMMUNICATION OF VOLUME. COMPANY INVESTIGATION IS ON GOING AND A SUPPLEMENTAL REPORT WILL BE SUBMITTED ONCE THE INVESTIGATION IS COMPLETE.
About This Pipeline Incident
Pipeline incident data is reported to the Pipeline and Hazardous Materials Safety Administration (PHMSA). All significant incidents involving fatalities, injuries, or property damage over $50,000 must be reported.