The processing length of
boiler threaded flue steel pipes is not fixed. Its specifications vary depending on the boiler's design parameters (such as evaporation capacity, pressure, thermal efficiency, etc.), installation space, and specific application scenarios. The following are common situations and related explanations regarding the processing length of boiler threaded flue steel pipes:
First, the conventional processing length range for boiler threaded flue steel pipes.
The length of boiler threaded flue steel pipes is usually matched to the length of the boiler shell, with a common range of approximately 1.5 meters to 6 meters. Specifically, it can be divided into the following categories:
Short steel pipes: 1.5 meters to 3 meters, mostly used in small boilers (such as steam boilers with an evaporation capacity ≤ 4t/h, small hot water boilers), or in areas with compact internal boiler structures (such as flue gas diversion chambers).
Medium-long steel pipes: 3 meters to 5 meters, a commonly used specification for medium to large industrial boilers (evaporation capacity 4t/h to 20t/h), suitable for most horizontal water-pipe and fire-pipe boilers and vertical boiler threaded flue steel pipe assemblies.
Long steel pipes: 5-6 meters and above, mainly used in large power plant boilers, waste heat boilers, etc. They need to be designed in conjunction with the overall boiler shell, and in some cases, they will be welded together (meeting strength and sealing requirements).
Second, Factors Affecting the Length of Boiler Threaded Smoke Steel Pipes
(1) Boiler Type: The length of the threaded smoke steel pipes in horizontal internal combustion boilers (such as WNS type) is usually consistent with the length of the boiler shell, generally 3-5 meters; The threaded smoke steel pipes in vertical boilers are shorter, mostly 1.5-3 meters.
(2) Manufacturing Process: The length of seamless boiler threaded smoke steel pipes is limited by the blank length of the seamless steel pipe, with a single steel pipe approximately 6 meters long; Seamed boiler threaded smoke steel pipes can be extended by rolling and welding, but must meet the welding quality requirements of standards such as GB/T 3087 (Seamless Steel pipes for Low and Medium Pressure Boilers) and GB/T 5310 (Seamless Steel Pipes for High Pressure Boilers).
(3) Transportation and Installation: Excessively long boiler threaded flue steel pipes increase transportation difficulty. Therefore, boiler threaded flue steel pipes exceeding 6 meters may be manufactured in sections and assembled on-site using flanges or welding (ensuring smooth flue gas flow and preventing air leakage).
Third, Relevant Standards and Customization of Boiler Threaded Flue Steel Pipes.
The length of boiler threaded flue steel pipes must conform to boiler design standards (such as GB/T 16508 "Shell Boilers" and GB/T 19212 "Water Steel Pipe Boilers") and be customized by the boiler manufacturer according to the specific model. The "thread parameters" (such as pitch and thread height) of the boiler threaded flue steel pipe are key indicators (affecting heat transfer efficiency). The length must match the stroke of the thread processing equipment, and the thread processing must be uniform (avoiding excessively long unthreaded sections at both ends, which would affect the heat exchange area).
Fourth, Precautions for Boiler Threaded Flue Steel Pipes.
If the length of the boiler threaded flue steel pipe is too short, it will reduce the heat exchange area and lower the boiler's thermal efficiency; if it is too long, it may lead to increased flue gas resistance, or even problems such as boiler threaded flue steel pipe vibration and overheating. Optimization through thermal calculations is necessary. For high-pressure boilers, the length of the boiler's threaded smoke steel pipes needs to be determined in conjunction with parameters such as wall thickness and material (e.g., 20G, 12Cr1MoVG) to ensure structural stability under high temperature and pressure.
Threeway Steel is known as a professional supplier engaged in manufacturing and distributing a wide range of steel pipe, and our headquarter located the central part of China – Hunan and six associated factories throughout China.
Threeway Steel is known as a professional supplier engaged in designing, manufacturing and distribution of a wide range of steel products with the headquarter located the central part of China – Hunan and six associated factories throughout China.
Threeway Steel is known as a professional supplier engaged in designing, manufacturing and distribution of a wide range of steel products with the headquarter located the central part of China – Hunan and six associated factories throughout China.
Threeway Steel is known as a professional supplier engaged in designing, manufacturing and distribution of a wide range of steel products with the headquarter located the central part of China – Hunan and six associated factories throughout China.
Threeway Steel is known as a professional supplier engaged in designing, manufacturing and distribution of a wide range of steel products with the headquarter located the central part of China – Hunan and six associated factories throughout China.
