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Boiler seamless pipes are a specialized type of steel pipe commonly used in boiler systems. They fall under the broader category of seamless steel pipes, and their manufacturing process is similar to that of standard seamless pipes. However, they require the use of specific steel grades that can withstand extreme conditions. These pipes are typically exposed to high temperatures and pressures, making them susceptible to oxidation and corrosion from flue gas and steam. Therefore, boiler seamless pipes must possess excellent endurance strength, high resistance to oxidation and corrosion, and good microstructural stability.
These pipes are primarily used in critical components of boilers, such as high-pressure steam lines, main steam pipes, and other high-temperature applications. There are different types of boiler seamless pipes designed for various pressure levels. For example, general-purpose boiler seamless pipes are used for water wall tubes, boiling tubes, superheated steam tubes, and smoke pipes in locomotive boilers. On the other hand, high-pressure boiler seamless pipes are employed in superheater tubes, reheater tubes, air preheater tubes, and main steam lines of high and ultra-high pressure boilers.
According to the Chinese standards GB3087-82 "Seamless Pipes for Low and Medium Pressure Boilers" and GB5310-95 "High Pressure Seamless Steel Pipes for Boilers," the appearance quality of these pipes must meet strict requirements. Any cracks, folds, wrinkles, scale, delamination, or hairline defects on the inner or outer surfaces are not allowed. If such defects exist, they must be completely removed. The depth of the removal should not exceed the negative tolerance of the nominal wall thickness, and the remaining wall thickness at the cleaned area must not be less than the minimum allowed by the specification.
To calculate the weight of a seamless boiler pipe, you can use the following formula: (Outer Diameter - Wall Thickness) × Wall Thickness × 0.02466. This gives the approximate weight in kilograms per meter.
For more detailed information about seamless tubes and related technical specifications, visit the official website of 51 Steel Net. It's a great resource for both professionals and those new to the field who want to deepen their understanding of boiler piping systems.