The key to the installation technology of centrifugal pumps is to determine the installation height of the pump. This height refers to the vertical distance from the water surface of the water source to the centerline of the impeller of the pump. It cannot be confused with the allowable suction vacuum height. The allowable suction vacuum height marked on the pump nameplate or product manual refers to the vacuum value on the water inlet section of the pump, and It is measured under the condition of 1 standard atmospheric pressure and water temperature of 20 degrees Celsius. It does not consider the water flow conditions after the suction pipe is matched. The installation height of the water pump should be the remaining value after deducting the loss lift of the suction pipe from the suction vacuum height, which should overcome the actual topographical suction height. The installation height of the water pump cannot exceed the calculated value, otherwise, the water pump will not be able to pump water. In addition, the influence on the calculated value is the resistance loss head of the suction pipe. Therefore, it is advisable to adopt a short pipe layout and install as few elbows and other accessories as possible. It may also be considered to properly equip a water pipe with a larger diameter to reduce the flow rate in the pipe.