Challenge

A Gulf Coast Refinery scheduled turnaround required taking the Mid Crude and West LEU process units out of service. To achieve this, the units needed to be depressurized and decontaminated of LEL and H2S.

Solution

Envent supplied two temporary degassing and vapor control systems to safely and efficiently combust VOCs from the two process units. To manage high pressures, Envent provided two high-pressure regulators to reduce pressure to a controlled level. Additionally, two recirculating caustic scrubbers were deployed to neutralize H2S before the vapors were combusted by two EMECS 70 thermal oxidizers.

Benefit

Envent provided a safe, efficient, and compliant solution for removing VOCs and H2S from the process units. By utilizing high pressure regulators, the system ensured a controlled pressure reduction which allowed for safe operation. The use of recirculating caustic scrubbers effectively neutralized H2S, minimizing environmental impact. Additionally, the thermal oxidizers efficiently combusted vapors, ensuring regulatory compliance while also reducing emissions. Overall, the vapor control system streamlined the turnaround process allowing maintenance and modifications to proceed as scheduled.