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GOLDEN TRIANGLE STORAGE, LLC

gas_transmission Incident —

Incident Information

Report Date—
OperatorGOLDEN TRIANGLE STORAGE, LLC
Commodity—
Pipeline Typegas_transmission

Location

State
Coordinates30.02402, -94.07664

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 2/29/24, NATURAL GAS COMPRESSOR UNIT B (UNIT B) WAS STOPPED DURING ROUTINE SHUTDOWN; THIS ACTION ISSUES A ""CLOSE"" COMMAND TO UNIT B'S REMOTE ACTUATED SUCTION VALVE SD2401B. SDV2401B'S ACTUATOR USES A SOLENOID VALVE (VERSA VALVE) WHICH IS RESPONSIBLE FOR SDV2401B'S ACTUATOR OPERATION. THE SOLENOID VALVE MALFUNCTIONED PARTWAY THROUGH THE CLOSURE OF SDV2401B. SHORTLY AFTER, THE SCADA SYSTEM ALERTED THE CONTROLLER THAT SDV2401B FAILED TO CLOSE. THE ALERT WAS ACCOMPANIED BY ADDITIONAL ALARMS, 38 ALARMS IN A 40 SECOND PERIOD, WHICH INCLUDED NUISANCE ALARMS RELATED TO THE COMPRESSOR SHUTDOWN AS WELL AS ALARMS FROM UNRELATED FACILITY ACTIVITIES. ALL ALARMS WERE ACKNOWLEDGED BY THE CONTROLLER. SDV2401B REMAINED IN ALARM STATE AND SDV2401B WAS LEFT PARTIALLY OPEN. A SHORT TIME LATER, THE CONTROLLER ISSUED A SCADA COMMAND TO STOP THE COMPRESSOR BUILDING FAN SYSTEM, WHICH, BY DESIGN, AUTOMATICALLY TRIGGERS A BLOW-DOWN OF ALL GAS PIPING INSIDE THE COMPRESSOR BUILDING VIA THE FACILITY BLOW-DOWN SYSTEM BY ISSUING AN 'OPEN' COMMAND TO BYPASS VALVE XXV2404B AND BLOW-DOWN VALVE BDV2411B. THIS BLOW-DOWN PROCESS IS NECESSARY TO ENSURE THE BUILDING SAFE TO WORK IN. WITH SDV2401B STILL IN A PARTIALLY OPEN POSITION AND XXV2404B AND BDV2411B IN THE OPEN POSITION, A FLOW PATH WAS PRESENT FOR GAS TO CONTINUOUSLY FLOW FROM THE SUCTION SIDE OF THE COMPRESSOR UNIT B TO THE FACILITY BLOW-DOWN SYSTEM, RESULTING IN A CONTINUOUS RELEASE OF GAS @ 600 MSCF/H. ON 3/1/2024, THE MEASUREMENT TECH RECOGNIZED AN ISSUE WITH A GAS FLOW TOTALIZER IMBALANCE AND THEN DISCUSSED THE ISSUE WITH THE ON-SHIFT CONTROLLER. THE OPERATIONS TEAM INSPECTED THE FACILITY BLOW-DOWN SYSTEM AND IDENTIFIED GAS VENTING FROM THE TOP OF THE BLOW-DOWN SILENCER. IMMEDIATE ACTION WAS TAKEN TO CLOSE THE FACILITY'S BLOW-DOWN SYSTEM AND HALT THE GAS RELEASE. SDV2401B WAS STROKED TO TROUBLESHOOT AND TEST WHAT SHOULD HAVE BEEN NORMAL FUNCTION. THE ACTUATOR SOLENOID VALVE (VERSA VALVE) WAS SERVICED, AND PROPER OPENING/CLOSURE WAS VERIFIED WITH SDV2401B.

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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