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鍋炉产品中有大量管子,其直徑一般在φ32～108毫米之間,按它在产品中的不同作用而具有各种不同的弯曲半徑。因此,在鍋炉制造厂中弯管工作的比重較大。管子外壁在弯曲过程中因受拉伸而变薄,內壁受压縮而增厚,并由于横压力的作用,使管子横断面变成椭圓,以致管子的强度减弱,并增加工质的流动阻力,不利于工质循环。因此根据鍋炉制造的技术要求,規定
There are a large number of tubes in the boiler product, the diameter of which is generally in the range of φ32 to 108 mm, with different bending radii depending on the different effects in the product. Therefore, the proportion of elbow pipe work in the boiler factory is large. Due to the thinning of the outer wall of the pipe during stretching and the thickening of the inner wall due to the compression, the cross-section of the pipe becomes elliptical due to the horizontal pressure, so that the strength of the pipe is weakened and the working fluid Flow resistance, is not conducive to the working fluid cycle. Therefore, according to the boiler manufacturing technical requirements, regulations