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离心泵抽不上水的原因及对应的解决方法。
The reason why centrifugal pump can not pump water and the corresponding solutions.
1.因为没有灌满水或者进口管道的空气没有抽完，所以导致它抽不上水。针对这种问题我们采取的方法：向离心泵继续灌水或者把进口管道中的空气抽完。
1. Because there is no full water or the air in the inlet pipeline is not exhausted, it cannot be pumped. To solve this problem, we adopt the method of continuous irrigation to the centrifugal pump or exhausting the air in the inlet pipeline.
2.因为它实际需要的扬程太高，所以导致扬程达不到要求，从而抽不上水。针对这种问题我们采取的方法：对离心泵进行更换，换扬程更好的离心泵。
2. Because the actual lift required is too high, the lift can not meet the requirement, so the water can not be pumped. To solve this problem, we adopt the method of replacing the centrifugal pump and changing the centrifugal pump with better lift.
3.因为吸水管路或密封装置出现严重的漏气情况，所以它抽不上水。针对这种问题我们采取的方法：对漏气部位进行修补或堵塞、更换密封装置。
3. It can't pump water because of serious air leakage in the suction pipeline or sealing device. To solve this problem, we adopt the method of repairing or blocking the leaking part and replacing the sealing device.
4.因为离心泵的转速比较低，所以它抽不上水。针对这种问题我们采取的方法：对它的转速进行提高。
4. Because the speed of centrifugal pump is relatively low, it can not pump water. To solve this problem, we adopt the method of improving its speed.