Patent ID: 7716803
Filing Date: 2010-05-18
Classification: F16L,Y10T

Abstract:
1. A method of fabricating an elongate flexible pipe, resistant to longitudinal stress, for conveyance of fluid, the method comprising the steps of: forming a coiled metal sheet; rolling the coiled metal sheet; slitting the rolled coiled metal sheet to form a metal strip; winding at least one metal element in a short pitch helix, with a winding angle measured along a longitudinal axis of the pipe of close to 90°, around an inner sealing sheath for withstanding radial forces in the inner sealing sheath; winding the metal strip in a long pitch helix, with a lay angle measured along the longitudinal axis of the pipe of less than 60°, around the at least one metal element in such a manner that the width to height ratio of the wound metal strip is between 4 and 20; and applying an external protective sealing sheath around the wound metal strip to form the flexible pipe for conveyance of the fluid.