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DCP MIDSTREAM

gas_transmission Incident —

Incident Information

Report Date—
OperatorDCP MIDSTREAM
Commodity—
Pipeline Typegas_transmission

Location

State
Coordinates40.29207, -104.94181

Cause

CauseOTHER OUTSIDE FORCE DAMAGE
Subcause—

Casualties

Fatalities0
Injuries0

Costs

Property Damage—
Lost Commodity—
Public/Private Damage—
Emergency Response—
Environmental Remediation—
Other Costs—

Location Map

Incident Narrative

DCP GAS CONTROL RECEIVED A CALL FROM A PROPERTY OWNER ON APRIL 2, 2019 AT APPROXIMATELY 10:00 AM MST REPORTING A SUSPECTED GAS RELEASE. DCP PERSONNEL ARRIVED ON SITE AT APPROXIMATELY 10:15 AM MST AND CONFIRMED A GAS RELEASE AND ISOLATED THE LINE. DCP PERSONNEL BLEW DOWN REMAINING PRESSURE IN THE LINE. INITIAL INVESTIGATION INDICATED A CRACK IN THE PIPE AT APPROXIMATELY THE 6-O'CLOCK POSITION IMMEDIATELY ADJACENT TO A GIRTH WELD TO BE THE SOURCE OF THE RELEASE. BASED ON INVESTIGATION AND METALLURGICAL ANALYSIS, DCP HAS DETERMINED THAT THE BZ-7-1-2-EXT CLASS 2 GAS GATHERING PIPELINE FAILED DUE TO CYCLIC FATIGUE CAUSED BY EXTERNAL LOADING. THE BZ-7-1-2-EXT PIPELINE RUNS PARALLEL TO A COUNTY ROAD AND UNDERNEATH AN INTERSECTION WITH A SECOND COUNTY ROAD. AS PART OF A COUNTY ROAD EXPANSION PROJECT IN AUGUST 2015, A HEAVY CONCRETE PRE-FABRICATED DRAINAGE CULVERT AND SUPPORT BRACE WERE INSTALLED DIRECTLY OVER AND WITHIN A FEW INCHES OF THE TOP OF THE PIPELINE AT THE INTERSECTION. DCP HAD LOCATED AND MARKED THE PIPELINE IN JULY 2015 IN RESPONSE TO AN 811 NOTIFICATION FOR THE ROAD PROJECT, BUT DCP WAS NOT PROVIDED WITH THE COUNTY'S CONSTRUCTION PLANS PRIOR TO THE WORK BEING DONE, AND WAS NOT AWARE NOR MADE AWARE OF THE CONFLICT BETWEEN THE CULVERT INSTALLATION AND THE PIPELINE. FREQUENT HEAVY VEHICLE TRAFFIC AT THE INTERSECTION SUBSEQUENTLY APPLIED REGULAR CYCLIC LOADING TO THE CONCRETE CULVERT AND CONCRETE SUPPORT BRACE UNDER THE ROADWAY, WHICH CYCLIC LOADING CAUSED A BENDING FRACTURE AND THEN FINAL DUCTILE OVERLOAD TEAR OF THE GATHERING PIPELINE IMMEDIATELY BELOW, RESULTING IN THE FAILURE OF THE BZ-7-1-2-EXT PIPELINE ON OR IMMEDIATELY BEFORE APRIL 2, 2019. THE AFFECTED PIPELINE SEGMENT HAS BEEN PURGED OF ALL HYDROCARBONS, PHYSICALLY DISCONNECTED FROM ALL SOURCES OF GAS, AND CAPPED. DCP HAS FURTHER RESPONDED TO THE FAILURE BY CONDUCTING AN EXTENSIVE SOIL AND GROUNDWATER INVESTIGATION ON THE SURROUNDING PROPERTIES, AND IS PURSUING REMEDIATION OPTIONS WITH THE PROPERTY OWNERS UNDER THE OVERSIGHT OF THE COLORADO OIL AND GAS CONSERVATION COMMISSION.

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.

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