How should vapors be discharged during tank ventilation using an eductor-type air mover?

During tank ventilation using an eductor-type air mover, discharging vapors at least 12 feet above the ground surface is crucial for several safety and operational reasons. This height ensures that any potentially harmful vapors are dispersed effectively into the atmosphere, reducing the risk of accumulation at ground level where they could pose a hazard to workers or nearby structures. Dispersion at a higher elevation helps in minimizing exposure to flammable or toxic vapors, adhering to safety regulations and best practices designed to protect both personnel and the environment.

Furthermore, releasing vapors at this elevation aids in achieving better air circulation and dilution, allowing harmful substances to dissipate before they can affect people or ignite. Establishing a standard height for vapor discharge is often part of regulatory requirements to enhance safety in operations involving flammable materials.

Other methods, such as discharging vapors at ground level or into a containment vessel, might not be as effective in ensuring safe ventilation and could potentially lead to serious safety hazards.