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目前日本在给排水工程中,已大量使用硬质聚氯乙烯管。其水力计算仍采用其他管材的通用公式。但考虑到塑料管表面光滑,水流阻力小,在流速系数与管材的粗糙系数上,经过实测,作了些变动。现分述如下。一、给水用硬质聚氯乙烯管当管径 d≤50毫米时,采用铅管、铜管、钢管(新管),塑料管(硬质聚氯乙烯管、聚乙烯管)通用的威斯顿(Weston)公式,由于管径小,未考虑材质的影响。
At present, in Japan, in the water supply and drainage project, rigid polyvinyl chloride pipes have been widely used. Its hydraulic calculation still uses the general formula of other pipes. However, taking into account the smooth surface of the plastic pipe, the resistance of the water flow is small, and some changes have been made in the flow coefficient and the roughness coefficient of the pipe. The breakdown is as follows. First, rigid polyvinyl chloride pipe for water supply When the pipe diameter d ≤ 50 mm, the use of lead pipe, brass, steel pipe (new pipe), plastic pipe (rigid polyvinyl chloride pipe, polyethylene pipe) universal Wei Si Weston formula does not consider the influence of material because of its small diameter.