Spiral pipe duct

Spiral pipe duct is the low carbon steel or low-alloy structural steel strip at a certain helix angle (called molding angle) rolled into a tube, and the tube is made of welded joints, which can be used to narrow band production of large diameter steel pipe.

Spiral pipe duct is mainly used for oil and gas pipelines, its specifications diameter * wall thickness, said. There spiral welding and double-sided welding, pipe should ensure that hydrostatic test, weld tensile strength and performance of cold-formed to meet the requirements. Pressure transmission fluid with spiral submerged arc welded pipe is mainly used to transport oil, natural gas pipelines, high pressure steel, plastic, and easy welding and machining molding; generally low pressure liquid delivery spiral submerged arc welded pipe using automatic two-sided Submerged arc welding or welding into the legal system in general low pressure fluid for water, gas, air and steam delivery SAW pipe.

The main direction of development of Spiral pipe duct production pipeline due to increasingly higher bearing pressure, using increasingly harsh conditions, and to try to extend the life of the pipeline, so the main direction of development of spiral welded pipe are: (1) the production of large diameter thick-walled tube to increase resistance pressure capability; (2) the design and production of new steel structures, such as the double spiral welded pipe, that is half the thickness of the wall of double-welded steel pipe , not only the intensity is higher than the same thickness of the single tube, and will not appear brittle failure; (3) the development of new kinds of steel, smelting technology to improve the level of widespread adoption of controlled rolling and rolling after the heat treatment process, in order to continuously improve the toughness and weldability of the pipe body; (4) to develop coated pipe, If the tube wall coated with the coating, not only prolong life and improve the smoothness of the inner wall, reducing fluid friction, reducing the volume of wax and dirt, reducing the number of pigs to reduce maintenance costs.