先是能够运用两台双吸泵的 前提是两地的垂直高差相差不大 需求一台扬程30米的水泵加一台二级增压泵 缘由是在输水地形平缓（垂直高差不大）的条件下 每一米扬程相当于10~15米的程度射程 且配上二级增压泵即可到达保送700米的效果 优点是：廉价 而且二级增加泵小型容易搬运 缺陷是：二级增加泵需求另外再拉一条电线 且易损坏需常养护 故有第二套计划：直接用一台扬程70米的水泵 优点是便当且大型机器易颐养 缺陷是：费用相比如案一偏高
First of all, the premise that two pumps can be used is that the vertical elevation difference between the two places is not big. The reason why one pump with a lift of 30 meters and one secondary booster pump are needed is that under the condition of gentle water delivery terrain (no vertical elevation difference), the lift of each meter is equivalent to a range of 10-15 meters, and the effect of 700 meters can be achieved with a secondary booster pump. The advantages are: low cost Moreover, the small and easy handling defects of the two-stage increased pump are: the second stage increased pump needs another wire, which is easy to damage and needs regular maintenance, so there is a second set of plan: the advantages of using a pump with a head of 70 meters directly are convenient and the defects of large machines are: the cost is higher than that of the first case
This pumping too slowly should be the reason of unsuitable selection. Determine the appropriate flow according to the pipeline, and then determine the head according to the height difference between the water intake point and the final outlet end point plus the pipeline head loss. Of course, the voltage determines whether the selected pump can be used normally.
I suggest you don't do this. The water pressure will not reach, and the pumping will be relatively slow