Spülluft

Spülluft is a term used in German-speaking technical and engineering contexts to describe a controlled flow of air used to rinse, purge, or dry equipment, lines, or components. The word combines Spülen (to rinse) and Luft (air), reflecting its function as air used to displace liquids and residues.

In practice, spülluft serves as a non-contact method to remove liquid from surfaces or channels after a cleaning step. It is typically generated by a compressor or dedicated pneumatic system and delivered through nozzles or hoses. To prevent contamination or corrosion, the air may be filtered or conditioned, and in some cases enriched with an inert gas. Spülluft is often employed to empty pipelines, valves, reactors, and laboratory equipment, and it can be part of a larger cleaning or drying cycle.

Key parameters include the air pressure, flow rate, duration of the purge, and the geometry of the delivery outlet. The effectiveness of spülluft depends on proper timing and sequencing with liquid rinsing or cleaning steps, as well as compatibility with materials and the process medium. Safety and environmental considerations involve controlling aerosol generation, ensuring proper containment, and avoiding unintended reactions with residual substances.

Variants and related terms include spülluftstrahl (air jet for rinsing) and general purge air or purge gas concepts. In English-language documentation, spülluft is commonly described as purge air or drying with purge air, depending on the application.