The service life of stainless steel welded ventilation pipes will be affected by a variety of factors, in general, if properly maintained, its service life can reach more than 10 years, or even 20-30 years.

The following factors will have an important impact on its service life:

1. Material quality:

- The use of high-quality stainless steel material, with better corrosion resistance and strength, relatively long service life. For example, 304 or 316 stainless steels are generally more durable than lower-grade stainless steels.

2. Welding quality:

- Good welding process and technology can ensure that the weld is strong and defect-free, reducing the damage caused by weld cracking. Uneven welding or defects such as pores and cracks will shorten the service life.

3. Environmental conditions:

In more corrosive environments, such as near the sea or chemical plants, pipes are susceptible to corrosion and their service life will be shortened accordingly.

- Changes in temperature and humidity can also have an impact on the pipe. High temperature, high humidity environment may accelerate the corrosion and aging of the pipeline.

4. Maintenance:

- Regular cleaning to remove dust, oil and debris in the pipeline to prevent blockage and corrosion.

- Inspect the pipes to find and repair surface damage, corrosion and other problems in time.

5. Operating load:

- The operating frequency and air volume of the ventilation system will affect the wear degree of the pipe. High load operation may accelerate the loss of the pipeline.

For example, a factory located in an inland area with high-quality 316 stainless steel and good welding process can have a ventilation duct with a service life of more than 20 years under regular maintenance and normal operating load.

In another factory located in the coastal area, due to the strong corrosive environment, if poorly maintained, the ventilation pipe of the same material and process may have more serious corrosion and damage in about 10 years.

In short, by selecting high-quality materials, ensuring welding quality, providing a good operating environment and regular maintenance, the service life of stainless steel welded ventilation pipes can be effectively extended.