The key to the installation technology of vertical pipeline pump is to determine the installation height of pipeline sewage pump, namely the suction head. This height refers to the vertical distance from the water source surface to the centerline of the centrifugal pump impeller. It cannot be confused with the allowable vacuum suction height. The allowable vacuum suction height marked on the pump product manual or nameplate refers to the vacuum value on the water inlet section of the pump, and is measured by testing under 1 standard atmospheric pressure and 20 ℃ water temperature. It does not consider the water flow condition after the supporting of the suction pipe. The installation height of the water pump should be the value that is left after the allowable suction vacuum height deducts the loss head of the suction pipe. It should overcome the actual terrain suction height. The installation height of the pump shall not exceed the calculated value, otherwise, the centrifugal pump will not be able to pump water.

In addition, the calculation value is affected by the resistance loss head of the suction pipe. Therefore, the shortest pipeline layout should be adopted, and elbows and other accessories should be installed as little as possible. It can also be considered to properly equip larger caliber water pipes to reduce the flow rate in the pipe. It should be pointed out that when the elevation and water temperature of the installation site of Lishen pipeline sewage pump are different from the test conditions, if the local elevation is more than 300 meters or the water temperature being pumped is more than 20 ℃, the calculated value should be corrected. That is, the atmospheric pressure at different altitudes and the saturated steam pressure when the water temperature is higher than 20 ℃. However, when the water temperature is below 20 ℃, the saturated steam pressure can be ignored. In terms of the installation technology of Lishen pipeline sewage pump, the suction pipe is required to have strict sealing, without air and water leakage, otherwise the vacuum degree at the inlet of the centrifugal pump will be damaged, so that the water output of the centrifugal pump will be reduced, and even the water can not be pumped in serious cases. Therefore, it is necessary to do a good job in the pipeline interface work to ensure the construction quality of pipeline connection.