FIELD: mechanical engineering. SUBSTANCE: apparatus has base and water spraying nozzle positioned above base and connected with lock valve through pipeline. Nozzle is mounted for changing spray angle and displacement relative to base in vertical direction. Nozzle has casing and annular diffuser mounted on casing so that it embraces the casing to move it along axis. Insert is positioned within casing for axial motion. Base is formed as conical container narrowing to bottom part. EFFECT: increased efficiency, wider operational capabilities and enhanced reliability in operation. 2 cl, 3 dwg
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