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在压力管道输水过程中 ,流量、距离和终点水压一定时 ,缩小管径则导致起点水泵扬程提高 ;缩小管径可以降低一次性投资 ,但水泵扬程的升高必然会使输水管道的运行费用升高。在其使用年限内找一个两种投资叠加后的最低点 ,就是所要求得的经济管径De和经济流速Ve。由于标准管道分档的跳跃性 ,故而对于每种标准管径不仅有相应的最经济流量 ,并且有一个界限流量 ,在这个范围内的流量 ,这一管径都是经济的。
In the process of water conveyance in pressure pipelines, when the flow rate, distance and end point water pressure are constant, reducing the diameter of the pipeline will lead to the increase of the starting point of the water pump; decreasing the diameter of the pipeline can reduce the one-time investment, but the increase of the pump lift will inevitably make the transmission pipeline Operating costs increase. The lowest point after the superposition of the two types of investment within its useful life is the required economic diameter De and economic flow rate Ve. Due to the skipping of standard pipelines, there is not only the most economical flow for each standard pipe diameter, but also a bounded flow. In this range of flow, this pipe diameter is economical.