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ENBRIDGE ENERGY, LIMITED PARTNERSHIP

hazardous_liquid Incident —

Incident Information

Report Date—
OperatorENBRIDGE ENERGY, LIMITED PARTNERSHIP
Commodity—
Pipeline Typehazardous_liquid

Location

State
Coordinates47.69015, -95.40853

Cause

CauseEQUIPMENT FAILURE
Subcause—

Casualties

Fatalities0
Injuries0

Costs

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

Location Map

Incident Narrative

ON MARCH 1, 2022 AT APPROXIMATELY 10:54 PM CST, THE EDMONTON CONTROL CENTER RECEIVED A SEAL FAILURE AND A GAS ALARM FROM THE LINE 4 PUMP BUILDING AT THE CLEARBROOK TERMINAL. LINE 4 WAS IMMEDIATELY SHUT DOWN AND THE FACILITY WAS ISOLATED. AT 11:00 PM CST TECHNICIANS CONFIRMED THERE WAS A RELEASE ON LINE 4 UNIT 1 PUMP. UNIT 1 WAS NOT OPERATING AT THE TIME OF THE RELEASE. APPROXIMATELY 52 BARRELS OF CRUDE OIL WAS RELEASED WITH ALL PRODUCT BEING CONTAINED TO THE PUMP BUILDING. THE BULK OF THE VOLUME DRAINED INTO THE TRENCH SURROUNDING THE PUMP BASE. GRATING WAS REMOVED AND THE MAJORITY OF THE CRUDE OIL WAS VACUUMED OUT FOR REINJECTIONS. THE SOURCE OF THE RELEASE WAS IDENTIFIED AS FAILED PUMP SEALS ON UNIT 1. CRUDE OIL WAS CLEANED UP AND CLEAN UP MATERIAL WAS PROPERLY DISPOSED. THE PUMP WAS REMOVED FROM SERVICE FOR ADDITIONAL REPAIRS UNRELATED TO THE RELEASE. AS A RESULT OF THE FINDINGS FROM THE FAILURE ANALYSIS AND INFORMATION GATHERED THROUGHOUT THE COURSE OF THE INVESTIGATION, IT HAS BEEN DETERMINED THAT THE ROOT CAUSE OF THE RELEASE WAS DUE TO A SUBSTANTIAL CHECK VALVE SLAMMING EVENT WHICH CAUSED A WATER HAMMER EFFECT UPSTREAM OF THE UNIT 2 CHECK VALVE, ULTIMATELY LEADING TO THE FAILURE OF THE UNIT 1 MECHANICAL SEALS. THE PRIMARY RING AND MATING RING FACES CAME INTO CONTACT WITH ONE ANOTHER AS A RESULT OF THE WATER HAMMER, LEADING TO THE FRACTURE OF THE PRIMARY RING IN EACH OF THE MECHANICAL SEALS. TO PREVENT RECURRENCE, THE CURRENT MECHANICAL SEAL TYPE UTILIZED ON UNIT 1 WILL BE UPGRADED TO A DIFFERENT SEAL TYPE WITH A SECONDARY CONTAINMENT BUSHING, AS THE SECONDARY CONTAINMENT BUSHING WILL PROVIDE AN ADDED LAYER OF PROTECTION IN THE EVENT OF A SEAL FAILURE. UNIT 1 PUMP CASE WILL ALSO BE MODIFIED TO INCLUDE SEAL LEAK DRAINS AND SEAL LEAK VENTS THAT WOULD ALLOW FOR API PLAN 66A PIPING AND INSTRUMENTATION. THE APPROPRIATE PORTING SHALL ACCOMMODATE THE UPGRADED MECHANICAL SEALS WITH A SECONDARY CONTAINMENT BUSHING. THE PORTING IS TO BE INSTALLED WHILE UNIT 1 UNDERGOES A REBUILD UNRELATED TO THE RELEASE.

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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