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城市给水管纲的费用,占整个给水系统总费用的极大比重,一般约为60一80%。由此可见,研究采用管纲的技术经济计算方法,具有重要的国民经济意义。技术经济管纲的计算方法,是既使其满足水力计算上要求,又能满足最经济要求。在目前城市给水管纲设计中,有的采用着非常近似地决定给水管纲直径的方法,印所谓“平均经济流速法”。“平均经济流速”常根据设计经验而来,一般采用的数值常
The cost of urban plumbing, accounting for a large proportion of the total cost of the water supply system, is generally about 60-80%. Thus it can be seen that it is of important national economic significance to study the technical and economic calculation methods of pipelines. Technical economic management program is calculated, even if it meets the requirements of hydraulic calculations, but also to meet the most economical requirements. In the current design of urban water supply pipelines, some adopt the method of determining the diameter of the water supply pipelines in a very similar way, so-called “average economic flow method”. “Average economic flow rate ” often based on design experience, the commonly used values often