Advantages of spiral steel pipe:
(1) Steel pipes of different diameters can be produced by using strip steel of the same width, especially steel pipes of large diameter can be produced by narrow strip steel.
(2) Under the same pressure conditions, the stress of the spiral steel seam is smaller than that of the straight seam, which is 75% to 90% of the straight seam welded pipe, so it can withstand greater pressure. Compared with straight seam welded pipes with the same outer diameter, the wall thickness can be reduced by 10% to 25% under the same pressure.
(3) The size is accurate, the general diameter tolerance is not more than 0.12%, the deflection is less than 1/2000, and the ellipticity is less than 1%. Generally, the sizing and straightening process can be omitted.
(4) It can be produced continuously. In theory, it can produce infinitely long steel pipes. The loss of cutting head and tail is small, and the metal utilization rate can be increased by 6% to 8%.
(5) Compared with the longitudinal welded pipe, it is flexible in operation and convenient for changing varieties and adjustments.
(6) The equipment is light in weight and low in initial investment. It can be made into a trailer-type mobile unit to produce welded pipes directly on the construction site where the pipelines are laid.
(7) It is easy to realize mechanization and automation.
The disadvantage of the spiral steel pipe is: because the coiled strip steel is used as the raw material, there is a certain crescent bend, and the welding point is in the edge area of the strip steel with elasticity, so it is not easy to align the welding torch, which affects the welding quality. To do this, complex seam tracking and quality inspection equipment are set up.
Post time: Jan-12-2023