TUBULAR ARTICLES Russian patent published in 2003 - IPC

FIELD: pipeline facilities. SUBSTANCE: invention relates to tubular articles with elements protecting them from internal mechanical damage. Proposed tubular article contains coaxially arranged outer bearing envelope, inner tubular elements with ring gaskets and separating layers of material placed between outer bearing envelope and inner tubular elements with ring gaskets in between and in butt joints between tubular element and ring gaskets. Said separating layer are made of material with antiadhesive properties, thus releasing the surfaces with possibility of slipping of load-bearing envelope relative to inner tubular elements and self-alignment of tubular elements relative to each other. EFFECT: increased bending capacity of tubular articles without breaking at cyclic loads. 10 cl, 10 dwg