FIELD: apparatus specially designed for applying liquid or other fluent material to the inside of hollow work, particularly devices adapted to apply protective coating on inner pipeline surface.
SUBSTANCE: spraying head comprises body defining container for cement-sand mix to be expelled from container through slots made in spraying head wall under the action of centrifugal force. The cement-sand mix collides with radial blades and then falls on inner pipeline surface. Flat blades are adapted to create the first layers with uniformly-distributed sand particles. Blades having curvilinear profiles create high-speed cement-sand flow, which consolidates multilayered coating applied on inner pipeline surface.
EFFECT: increased reliability of inner pipeline surface protection against damage and corrosion.
2 cl, 4 dwg
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