Boiler tube is a type of seamless steel pipe. During use, they are subject to complex working environments such as high temperature and high pressure, which are prone to oxidation, corrosion and other problems, which in turn lead to thinning of the tube wall thickness and reduction of the strength of the tube material. When the thickness and strength of the tube drop to a certain level, the boiler tube needs to be replaced. The scrapping standard of boiler tubes mainly depends on the degree of wall thickness wear and the strength residual rate. Generally speaking, if the strength residual rate is less than 5% or the wall thickness wear exceeds 15% of the tube thickness, it needs to be scrapped and replaced. What are the main factors affecting it?

Factors affecting the service life
1. Material: Boiler tubes of different materials have different corrosion resistance and are subject to different corrosion effects in different working environments.
2. Welding: The welding quality of boiler tubes directly affects the integrity and safety of the pipeline.
3. Manufacturing process: The manufacturing process of boiler tubes must comply with national standards, including pipe procurement, pipe inspection, pipe forming, processing, coiling and opening processes.
4. Use environment: Boiler tubes work in high temperature, high pressure, corrosion, oxidation and other environments, so the environment has an important impact on the life of the tube.
5. Operation status: The temperature, pressure and water quality parameters of the boiler tube must be strictly controlled during operation, otherwise it is easy to cause pipeline corrosion and damage.

Methods to extend the service life
1. Strengthen maintenance: Regular inspection and maintenance, timely detection and repair of pipeline damage.
2. Reasonable material selection: Select suitable materials and good manufacturing processes to improve the heat resistance and corrosion resistance of the pipeline.
3. Control operating parameters: Strictly control parameters such as temperature, pressure, water quality during operation to avoid pipeline damage.
4. Anti-corrosion coating: For pipelines susceptible to corrosion, anti-corrosion coating can be used to increase the life of the pipeline.
5. Install safety shield: Install a safety shield on the inner shell of the pipeline to protect the possibility of the pipeline being mistakenly entered by personnel.

Summary
In short, the life of boiler tubes depends on many factors, from materials to manufacturing processes to usage environment to operating conditions, which all need to be strictly controlled. Only through scientific maintenance and management can the service life of boiler tubes be prolonged.