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低压火管锅炉烟管和管板胀接质量直接影响锅炉质量与安全运行,所以燕汽锅炉监察规程规定胀管率应控制在1.0—1.9％,而锅炉质量分等规定超胀管数>10％为不合格品。可见,胀管率是评价锅炉质量的重要指标之一,其计算公式为: H=(d_1-d_2-δ)/d_3×100％式中:H——胀管率(％);d_1——胀接后管子内径(mm);d_2——未胀时管子内径(mm);d_3——未胀时管孔直径(mm);δ——未胀时管孔直径与管子外径之差(mm).下面试作具体分析.
The quality of low-pressure fire tube boiler tube and pipe expansion directly affect the quality and safe operation of the boiler, so Yan steam boiler monitoring regulations regulation of expansion rate should be controlled at 1.0-1.9%, while the boiler quality control regulations over the number of expander> 10 % Is nonconforming product. It can be seen that the expansion rate is one of the important indexes to evaluate the quality of the boiler. The calculation formula is as follows: H = (d_1-d_2-δ) / d_3 × 100% Where: H --- inflation rate (%); d_1-- D_2 - tube diameter without expansion (mm); d_3 - tube hole diameter without expansion (mm); δ - tube hole diameter and tube outside diameter difference mm). The following trial for a specific analysis.