CONNECTION OF ENAMELED PIPES AND METHOD FOR MAKING THEREOF Russian patent published in 2004 - IPC

FIELD: building and construction. SUBSTANCE: connection has two enameled pipes, and enameled bushing, coaxially placed inside pipes, said bushing having outer radial projection along outer perimeter of middle cross-section and also having longitudinal slit. Before enameling of bushing after slitting it longitudinally for adjusting elastoplastic deformations of bushing along outer diameter up to size of inner diameter of enameled pipes, diametrical slits in pairs are also made on radial projection. Enameled bushing is compressed, and a dross of silicate fusible enamel is applied to touching surfaces. After placing bushing inside end portions of connected pipes and decompression thereof, surfaces of connection elements contact are pressed to each other by energy, accumulated during compression of bushing. Anticorrosive covering is formed in form of enamel composition on a length of connection, which is equal to bushing length along whole surface of contact of pipe ends and bushing, by utilizing the energy of welding during forming of root weld. Recommendations for choosing geometric parameters of bushing and selecting anticorrosive covering are included. EFFECT: increased reliability of connection. 2 cl, 2 dwg