WBI ENERGY TRANSMISSION, INC.

Incident Narrative

WBI ENERGY RECEIVED A CALL FROM THE GOLVA, ND FIRE CHIEF, WHO LIVES CLOSE BY THE GOLVA COMPRESSOR STATION, AT 9:32AM TO NOTIFY US THAT THERE WAS GAS BLOWING AT THE COMPRESSOR STATION. TWO WBI OPERATORS ARRIVED ON SITE AT 9:58AM AND ESD'D THE STATION. WHEN THE OPERATORS ASSESSED THE SITUATION, THEY FOUND THE SUPPLY LINE TUBING FROM THE PILOT THAT HOLDS THE RELIEF VALVE CLOSED HAD FAILED WHICH CAUSED THE RELIEF VALVE TO OPEN AND VENT GAS TO THE ATMOSPHERE. THE OPERATORS REPLACED THE FAILED TUBING AND PUT THE STATION BACK IN SERVICE AT 11:50AM. THIS SAME INCIDENT HAPPENED ON 1/7/23 AT THE GOLVA COMPRESSOR STATION ALSO. WBI PERFORMED AN INVESTIGATION OF THE SUPPLY LINE TUBING FAILURE THAT OCCURRED ON 1/7/24 AND 1/23/24. WBI'S VIBRATION TECHNICIAN TOOK VIBRATION INTENSITY READINGS ON THE RELIEF VALVE AND ASSOCIATED TUBING AND FOUND AMPLITUDES EXCEEDING ALLOWABLE LIMITS. WBI REPLACED THE SUPPLY LINE TUBING WITH HEAVIER WALL TUBING AND HAS DEVELOPED A PLAN FOR INSTALLING DIAGONAL SUPPORTS TO THE RELIEF VALVE AND ASSOCIATED PIPING. THE INSTALLATION OF THE ADDITIONAL SUPPORTS IS CURRENTLY BEING PLANNED AND TENTATIVELY SCHEDULED FOR THE FIRST WEEK IN MARCH. AFTER THE INSTALLATION OF THE SUPPORTS, ADDITIONAL VIBRATION ANALYSIS WILL BE PERFORMED TO CONFIRM THE VIBRATION HAS BEEN DAMPENED TO AN ALLOWABLE MAGNITUDE. UPDATE - INSTALLATION OF ADDITIONAL SUPPORTS WERE ADDED TO UNIT #1 ON 2/28 AND TO UNIT #2 ON 2/29