FIELD: the invention refers to maintenance of pipe-line systems particularly to cleaning the inner surface of pipe-lines from asphalt resinous, paraffin sediments and scale.
SUBSTANCE: the piston is a cylinder out of elastic porous material with a headwall in the shape of a truncated cone. The piston has a setting in presenting a row of separate plates of polyurethane or of oil-and-petrol resistant rubber evenly located along the height of the piston with angular displacement along its axle of the following plate relatively to previous one. The ends of the plates go beyond the surface of the piston.
EFFECT: the piston provides increase of quality of cleaning, increases its reliability and durability.
2 dwg
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