METHOD OF PIPELINES AND CYLINDRICAL TANKS INNER SURFACE COMPLEX TREATMENT Russian patent published in 1996 - IPC

FIELD: methods of liquids or other flowing substances application on surfaces to repair, restore and to take preventive measures in pipelines of household water supply, oil and gas pipelines , tanks for liquid gas, liquids and other substances storing. SUBSTANCE: compositions of functional usage are introduced as suspensions with thixotropic additions. Before each next composition of functional usage is fed a polymeric compound is additionally fed, that has degree of swelling in liquid medium of 100 - 300 times, to separate functional usage compositions from each other. Motion along treated surface is exercised by two volumes from two sides towards each other to zone of bottoms removal with adjustable resistance, providing turbulent mode of volumes flow. Produced by spatial polymerization of acrylamide modified polyacrylamide with molar mas of 2•10⁶-5•10⁶ is used as polymeric compound. Water or air are is used as transporting agent. As thixotropic addition they use powder-shaped water soluble polyelectrolyte - hydrolyzed polyacrylonitrile modified with mixture of natural salts of polymethylenenaphthalane of sulfonic acids, sodium sulfate and sodium salt of lignosulfonic acid or modified with salts of aluminumcarboxymethylcellulose. EFFECT: improved process. 4 cl, 1 dwg