What are the characteristics of choosing 304 stainless steel welded ventilation pipe to be used in ventilation and dust removal engineering of factory buildings?

304 stainless steel welded ventilation pipes are widely used in ventilation and dust removal engineering of factory buildings, and their characteristics are mainly reflected in material properties, structural stability, applicable environment and other aspects, as follows:

First, excellent corrosion resistance and adaptability to complex working conditions.

304 stainless steel contains about 18% chromium and 8% nickel, forming a passive film (Cr₂O₃), which can resist the corrosion of air, water vapor, weak acid and alkali and some industrial dust.

It is especially suitable for factories with dust containing a small amount of corrosive components (such as chemical industry, electronics, food processing, etc.) to avoid the problems of air leakage and shortened service life caused by corrosion of ordinary carbon steel pipelines.

For humid environment (such as cleaning area of textile mill and food factory), the corrosion risk caused by dew condensation on the inner wall of pipeline can be reduced.

Second, the welding structure has strong sealing performance and improves ventilation efficiency.

When welding connection (such as argon arc welding) is used, there is no obvious gap at the pipeline interface, and the air leakage rate is extremely low (usually < 1%) compared with flange connection or bite connection.

Ensure the stability of wind pressure and air volume of ventilation system, and avoid the decline of dust removal effect caused by air leakage (such as local dust accumulation in workshop).

Reduce energy consumption: under the same air demand, there is no need to increase fan power due to air leakage.

Third, high strength and rigidity, adapting to high wind speed and negative pressure

The tensile strength (≥520MPa) and yield strength (≥205MPa) of 304 stainless steel are much higher than those of ordinary galvanized steel plates, and the whole structure is rigid after welding.

Suitable for ventilation and dust removal systems with high wind speed (such as grinding dust collection in metal processing workshops, the wind speed often reaches 15-25m/s), and it is not easy to generate vibration or deformation due to airflow impact.

Can withstand the negative pressure of the system (such as negative pressure dust removal system, the negative pressure value is usually-500~-2000Pa), so as to avoid pipe shrinkage.

Fourth, the surface is smooth, reducing dust deposition and resistance

304 stainless steel has a high surface finish (Ra≤0.8μm), and dust (especially fine dust) is not easy to adhere to the inner wall of the pipeline.

Reduce the risk of pipeline blockage: for fibrous dust (such as textile mills) or sticky dust (such as wood processing), reduce the problems of cross-section reduction and resistance increase caused by deposition.

In the long-term operation, the system resistance changes little, and the energy consumption of the fan is stable.

5. Long service life and low maintenance cost

In general industrial environment, the service life of 304 stainless steel pipeline can reach 15-20 years, which is 3-5 times that of ordinary galvanized steel pipeline (3-5 years).

Reduce the downtime and labor cost of frequent pipeline replacement, especially suitable for continuous production plants (such as automobile factories and electronics factories).

Simple daily maintenance: the surface dust can be blown by compressed air or washed by clean water (strong water resistance) without complicated anti-corrosion treatment.

Six, excellent sanitary performance, suitable for scenes with high cleanliness requirements.

304 stainless steel is nontoxic and odorless, and its surface is easy to clean, which meets the hygiene standards of food, medicine, precision electronics and other industries.

For example, in the dust removal project of food processing plants, impurities produced by pipeline corrosion can be avoided from polluting food raw materials, and at the same time, regular disinfection (such as high-temperature water washing and chemical disinfection) can be tolerated.

Seven, moderate weight, good installation flexibility.

Although the density (7.93 g/cm) of 304 stainless steel is higher than that of galvanized steel, the thickness can be designed to be thinner (usually 1.0-2.0mm, depending on the pressure) and the overall weight is moderate.

Compared with FRP or concrete pipes, it is more convenient for on-site welding and installation, and adapts to the complex spatial layout of the factory building (such as high-altitude erection, turning, branching, etc.).

Eight, the cost is higher, but the comprehensive benefit is remarkable.

The initial procurement cost is higher than that of galvanized steel plate, PVC and other materials, but considering its long life, low maintenance and high reliability, the whole life cycle cost is lower.

It is especially suitable for industrial workshops (such as semiconductor workshops and precision machinery factories) with high requirements on equipment stability and large production loss.

summary

The core advantages of 304 stainless steel welded ventilation pipes are corrosion resistance, sealing, high strength, low resistance and long service life, which are especially suitable for ventilation and dust removal projects in corrosive environments, high wind speed/negative pressure systems, high cleanliness requirements or complex dust properties. Although the initial investment is high, it can significantly reduce the failure risk and maintenance cost in long-term operation.