FIELD: civil engineering; may be used for application of protective coatings. SUBSTANCE: in method jet velocity of mixture from ends of blades is increased from the beginning to the end of spraying head in direction of its motion by changing blade height. Mixture jet velocity may be varied stepwise along head length. Number of steps of velocity variation equals, at least, two. Head is moved at constant speed along the entire length of pipe. EFFECT: higher efficiency. 4 cl
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