公开(公告)号：US20210071783A1

公开(公告)日：2021-03-11

申请号：US16771713

申请日：2018-12-18

Applicant: TECHNIP FRANCE

Inventor： Javad SAFARI ,  Matthew Paul GREADY

IPC: F16L1/16 ,  B23K11/087 ,  B23K11/34 ,  B23K13/02 ,  B23K31/02 ,  B23K31/12 ,  B23K9/025 ,  B23K9/028 ,  B23K9/18 ,  B23K9/235

Abstract: A method of preparing a pipe-section for welding to another pipe-section to form a pipeline comprising a plurality of said pipe-sections, the method comprising at least the steps of: (i) providing a pipe-section having first and second pipe-ends; (ii) defining a first portion L1 of the longitudinal length of the pipe-section from the first pipe-end being in the range 3% to 40% of the overall length of the pipe-section; (iii) defining a second portion L2 of the longitudinal length of the pipe-section from the end of the first portion L1 towards the second pipe-end; (iv) heating at least the first portion L1 to at least a first temperature T1 of at least 500° C. for at least 2 minutes; (v) maintaining a second temperature T2 of the second portion L2 during step (iv) below the first temperature T1. The invention is able to reduce the strain capacity during reel-laying of a pipeline formed from a plurality of pipe sections formed by the invention.