FIELD: pipe line engineering. SUBSTANCE: thermoplastic material is extruded at the temperature exceeding the crystallization temperature to form a lining of ring- shaped cross-section. The cylinder-like lining is deformed by changing its ring-shaped cross-section into V-shaped cross-section at the temperature of restoring of shape memory. The lining having deformed cross-section is cooled up to the ambient temperature. The lining is deformed by several pressings of one of the parts of the cross-section in the diametrical direction to its opposite part in plane of symmetry. This allows the side parts of the cross-section to be double-walled and positioned symmetrically with respect to the plane of symmetry and provides defining a corrugation by concave part of the cross-section. EFFECT: simplified method and device. 8 cl, 26 dwg
