Some of the water is deep, some of the surrounding terrain is relatively flat, while ignoring the pump allows suction process, resulting in less water absorption or not the result of water suction. To know that the pump suction mouth can be established in the vacuum degree is limited, the absolute vacuum suction process is about 10 meters high water column, and the pump can not establish an absolute vacuum. And a large vacuum, easy to make the pump water vapor, the pump work. Therefore, all kinds of centrifugal pump has its maximum allowable suction process, generally between 3 to 8.5 meters, when the installation of pumps can not only facilitate the simple map.
