Flexible, but under the influence of an internal pressure in the pipe length stable

摘要

The invention relates to a flexible tubular pipe comprising an inner sealing sheath (6), an armouring (2, 3, 4, 5) consisting of at least two pairs of sheets of helically wound yarns, the two sheets of a same pair being composed of identical yarns placed at an identical armouring angle but in the opposite direction, and an outer protective sheath (1). …??All the yarns are placed at one of two armouring angles, one less than 55 DEG ( alpha a), the other greater than 55 DEG ( alpha b), the yarns of at least one pair of sheets having a same armouring angle alpha a such that:… 40 DEG /= alpha a /= 53 DEG … and the yarns of at least one pair of sheets having a same armouring angle alpha b such that:… 57 DEG /= alpha b /= 70 DEG