The production of gb/t 17396 hot-rolled seamless steel manufacturer is made by using strip steel coil material, which is bitten into a bone shape at one time through the duct forming machine, and then rolled into a circular tube along the spiral involute trajectory. At the same time, the bite seam is pressed tightly and cut to the required length. Since its introduction to the market, spiral ducts have been widely used in the construction industries such as shipbuilding, ventilation, air conditioning, purification, bridge dust removal, airports, and tunnels due to their inherent performance and low operating costs.

1. The common pipes for delivering cold and hot air are those of central air conditioning systems, which require insulation materials. Spiral air ducts can also be lined with insulation materials inside, giving the air ducts a beautiful spiral appearance and eliminating the need for suspended ceilings, thereby reducing the project cost.

2. Ventilation system: Supply fresh air and exhaust, expel harmful gases outdoors, and bring fresh air from outside into the room. Generally speaking, the flow rate of ventilation systems is usually large, so air delivery ducts with lower resistance are required to save on construction costs and operating expenses - spiral ducts are suitable. Under normal circumstances, galvanized iron pipes are used. In corrosive and particularly humid places, stainless steel pipes are used.

3. In the production process of factories, it is necessary to transport loose particles, especially those with low specific gravity such as foamed plastic particles. Spiral ducts are used, which are cost-effective and highly effective.

4. In the kitchens of restaurants, hotels, barbecue restaurants and guesthouses, a large amount of cooking fumes are produced and need to be discharged. Spiral ducts are suitable for this purpose.

5. For the hot air pipelines in centralized heating projects, the outer layer of the insulation layer uses spiral ducts, which ensures a long service life and high quality of the pipelines.

The advantages of spiral ducts over rectangular ducts: Compared with rectangular air ducts, circular air ducts have significant advantages in terms of tightness, strength, and area-to-perimeter ratio. However, their fabrication is more difficult than that of rectangular air ducts, and the main difficulty lies in the large space height they occupy. But with the application of spiral air ducts, the shortcomings of circular air ducts have been improved to a certain extent, leading to the promotion of circular spiral air ducts.

The spiral duct has good sealing performance and low leakage. Through tests on various series of pressures, the spiral duct section itself can ensure no leakage, which is something that rectangular ducts cannot achieve. Due to the size of the steel plates, rectangular air ducts need to be equipped with a pair of flanges every two meters, and the flange connection points are prone to leakage. The length of the spiral duct can be set according to the user's needs, reducing the number of duct connections and leakage points. Moreover, spiral ducts can be connected without flanges, which results in less leakage. The reduction in leakage leads to lower daily operating costs and energy consumption.

The joints of spiral ducts are circumferential, and the strength of the joints is much higher than that of radial straight joints. Therefore, spiral ducts can ensure that there is no cracking at the joints under 1.5 times the working pressure. Moreover, due to the high strength of spiral ducts, the specifications also stipulate that the thickness of the plates of spiral ducts can be appropriately reduced by 10% to 15% compared with general circular ducts. At the same time, the spacing between the supports and hangers of spiral ducts can also be longer than that of general ducts, reaching up to 5m (D≤400mm) and 3.75m (D 400mm). The manufacturing of spiral ducts is highly automated and the production speed is very fast. Generally, 20 to 40 meters of ducts can be produced per minute. Due to the lower price of the raw material galvanized steel strip compared to the whole galvanized steel plate, coupled with factory production and standardized specifications, the cost of spiral ducts is lower than that of rectangular ducts. In addition, due to the small amount of supports and hangers required and the low installation workload, the total cost of spiral ducts is relatively low. Due to the fact that the four corners of rectangular air ducts are prone to turbulence, the effective flow area is reduced. Spiral air ducts have good air fluidity and a large effective flow area, so the secondary noise of spiral air ducts is small. Because of the high strength of spiral air ducts, the low-frequency noise caused by air duct vibration is even smaller. The air flow performance is good, the system pressure drop is small, and the power consumption of the daily operation system is low.

At present, flat oval air ducts can also be used to reduce the height of the space occupied by the air ducts. Flat oval air ducts are made by using special equipment to stretch and shape the circular air ducts into flat oval shapes. Because both sides of the air duct are circular, the airflow is stable, the rigidity of the air duct is good, and the exposed installation is aesthetically pleasing. It is a relatively ideal series of air ducts.

gb/t 17396 hot-rolled seamless steel manufacturer https://www.torichsteel.com/GB-T-17396-Hot-rolled-Seamless-Steel-Tubes-For-Hydraulic-Pillar-Service.html