The characteristics of spiral welded pipe production are:
(1) Tubes with a variety of outer diameters can be produced with strips of the same width;
(2) The pipe has good straightness and precise dimensions. The inner and outer spiral welds increase the rigidity of the pipe body, so there is no need for sizing and straightening after welding;
(3) It is easy to realize mechanization, automation, and continuous production;
(4) Compared with other equipment of similar scale, it has small dimensions, less land occupation and investment, and faster construction;
(5) Compared with the straight seam welded pipe of the same size, the weld per unit length of the pipe is longer, so the productivity is lower.
The main development direction of spiral welded pipe production is due to the increasing load-bearing pressure of pipelines, increasingly demanding conditions of use, and to extend the service life of the pipeline as much as possible, so the main development directions of spiral welded pipe are:
(1) Produce large-diameter thick-walled pipes to improve pressure resistance;
(2) Design and produce steel pipes with new structures, such as double-layer spiral welded pipes, that is, double-layer pipes are welded with strip steel half the thickness of the pipe wall, which not only has higher strength than single-layer pipes of the same thickness but also will not cause brittle failure;
(3) Develop new steel grades, improve the level of smelting technology, and widely adopt controlled rolling and post-rolling heat treatment processes to continuously improve the strength and toughness and welding performance of the pipe body;
(4) Vigorously develop coated pipes, such as coating the inner wall of the pipe with an anti-corrosion layer, not only can extend the service life, but also improve the smoothness of the inner wall, reduce fluid friction resistance, reduce wax and dirt, reduce the number of pigs, and reduce maintenance cost.
Post time: Nov-10-2023