CASCADE NATURAL GAS CORP
gas_transmission Incident — — March 22, 2024
Incident Information
| Incident Date | March 22, 2024 |
| Operator | CASCADE NATURAL GAS CORP |
| Commodity | NATURAL GAS |
| Pipeline Type | gas_transmission |
Location
| State | |
| Coordinates | 48.45248, -122.51111 |
Cause
| Cause | CORROSION FAILURE |
| Subcause | EXTERNAL CORROSION |
Casualties
| Fatalities | 0 |
| Injuries | 0 |
Costs
| Property Damage | $294,991 |
| Emergency Response | $0 |
| Other Costs | $0 |
Location Map
Incident Narrative
"ON MARCH 22, 2024, AT 9:30AM PST A CASCADE NATURAL GAS EMPLOYEE WAS PERFORMING A ROUTINE LEAK SURVEY AND DISCOVERED A LEAK ON AN 8"" TRANSMISSION LINE IN ANACORTES, WA. UPON INVESTIGATION, THE LEAK WAS IDENTIFIED AS A NON-HAZARDOUS GRADE 3 LEAK. AFTER DETERMINING THE SEGMENT OF PIPELINE WOULD BE REPLACED, ESTIMATED COSTS OF $175,000 WERE CALCULATED ON APRIL 22, 2024, AT 2:00PM PST. THE LEAK WAS ISOLATED WITH STOPPER FITTINGS AT 9:50AM PST ON MAY 7, 2024. THE SEGMENT OF PIPELINE WAS ISOLATED TO MAKE REPAIRS. THE NEW SEGMENT OF PIPELINE WAS PLACED IN SERVICE AT 7:15PM PST ON MAY 15, 2024. THE PIPELINE HAD CORROSION ON THE PIPE WELD SEAM, WHICH APPEARS TO BE SELECTIVE SEAM CORROSION. PIPE SEGMENT IS BEING SENT TO A LAB FOR FURTHER EVALUATION. THE FINAL REPORT WILL BE SUBMITTED UPON FINAL COST CALCULATION AND LAB ANALYSIS OF FAILED PIPE SEGMENT. ADDITIONALLY, GAS LOSS WILL BE UPDATED AFTER LAB ANALYSIS DETERMINES THE HOLE SIZE. AUGUST 29, 2024, UPDATED PART A 7. ESTIMATE VOLUME OF GAS RELEASED UNINTENTIONALLY: 4,967 MCF UPDATED PART D 7B. ESTIMATED COST OF OPERATOR'S PROPERTY DAMAGE AND REPAIRS: $294, 991. LAB ANALYSIS CONFIRMED THE CAUSE OF THE LEAK WAS DUE TO SELECTIVE SEAM CORROSION AND UPDATED GAS LOSS ESTIMATE."
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.