In which scenario would an installed in-line eductor be primarily used?

An installed in-line eductor is primarily used to proportion foam into a water stream. This device works by utilizing the venturi effect, where water flowing through the eductor creates a vacuum that draws foam concentrate from a reservoir into the water stream, efficiently mixing it. This is crucial for fire suppression activities, especially in scenarios involving aviation fuel, where fire-fighting foam is necessary to effectively combat the flames and suppress vapor release.

When proportioned correctly, the foam enhances the water's ability to cool and suffocate the fire, providing a protective barrier over the flammable liquids. This method of foam application ensures that the correct ratio of foam to water is maintained, allowing for optimal firefighting effectiveness. Other scenarios mentioned may involve water management and cooling techniques, but they do not specifically utilize the function of an in-line eductor designed for foam proportioning.