Technical analysis of spiral tube

Superior structural characteristics of spiral steel pipe determines its power, chemical, petroleum and nuclear industry and other fields increasingly widely used.

Spiral steel pipe technology in the heat, mix in many fields such as chemical is widely used to obtain good results. But the spiral technique in mass separation of the application up to now is still relatively small. In recent years, many people will spiral technology used in microfiltration, nanofiltration, osmotic membrane distillation and mass transfer of hollow fiber membrane separation process, have achieved good results. This is because the coil may be formed inside the pipe perpendicular to the axial direction of the tube of the secondary flow, which secondary flow and axial spiral mainstream combined into forward movement of such mass transfer layer of the fluid, which not only depend on the fluid The radial diffusion, as well as the role of the secondary flow radially, is equivalent to the boundary layer destruction, mass transfer surface profile. Enhances the movement of fluid in laminar flow mixing to enhance mass transfer. Spiral will also improve the outflow tube type, ie a flow-type shell. Increasing radial mixing liquid tube, shell reduce channeling and dead zone, and due to the proximity crossflow, the surface of the fiber mass constantly updated, the shell side mass transfer coefficient is further increased. Spiral universal superiority lies in this. But it is in many other aspects of the practical application of the special role.

The spiral structure of spiral heat exchanger has made rugged, adaptable, wide selection, easy to manufacture, low production costs, it is widely used in refrigeration and air conditioning, chemical, pharmaceutical and other industries. Done according to the nature of HDPE plastic spiral coil, with a light texture, high strength, good toughness, easy to lay, water resistance, low cost, corrosion resistance, etc., its performance and economic benefits far exceeding the reinforced concrete pipes and general specifications iron pipe, pipe replacement of engineering products. In metallurgy, petrochemical and other industries exchanger design, there are various forms of heat, but there is a conventional heat exchanger ineffective, difficult to clean, stain resistance and large more drawbacks, can not meet the production needs of customers. According to the spiral knot spiral hose heat exchanger to do its good heat transfer effect, easy to clean, stain resistance, compact structure and so on. So gradually being popularized. Plastic spiral (also called hollow wall winding plastic tube) is a kind of wall structure is very reasonable plastic pipe. The overall use of spiral structure. Used for urban drainage works, drainage facilities can improve the ability (or reduced diameter) and engineering service life, convenient construction, shorten the construction period, when the high water table, depth excavation and repair large or require advanced road, the project cost significantly reduced. Spiral steel pipe has many advantages over straight pipe heat transfer characteristics and structural characteristics. Heat transfer coefficient higher than the straight tubes in the same space, a larger heat transfer area is obtained, a longer pipe arrangement, reducing the weld, improved safety. So spiral heat exchangers and steam generators in the power, chemical, aerospace and nuclear and other engineering fields has been widely used.

Weled steel pipe specification, Standard and identification

Welded steel pipe (steel pipe manufactured with a weld) is a tubular product made out of flat plates, known as skelp, that are formed, bent and prepared for welding.