Pipeline centrifugal pump installation technology key lies in determining the pump installation height (ie suction). This height refers to the vertical distance from the water surface of the water source to the center line of the pump impeller. It can not be confused with the allowable vacuum height. The allowable vacuum height indicated on the pump manual or nameplate means the vacuum value on the water inlet section of the water pump, Is measured at 1 standard atmospheric pressure, the water temperature of 20 degrees Celsius, the test and measured. It does not consider the condition of the flow of water after the water pipe is supplied. The pump installation height should be allowed to suck vacuum height deducted after the loss of suction pipe head, the remaining part of the value, it is necessary to overcome the actual terrain water absorption height. Pump installation height can not exceed the calculated value, otherwise, the pump will not pump water.
　　
Affect the calculated value is the size of the suction pipe lift loss lift, it is appropriate to use the shortest pipe layout, and try to install less elbow and other accessories, but also consider appropriate with larger diameter pipes to reduce the flow rate within the pipe.
　　
It should be noted that the pipelines centrifugal pump installation site elevations and water temperature is different from the test conditions, such as the local elevation of 300 meters above or pumping water temperature exceeds 20 degrees Celsius, the calculated value to be amended. Ie atmospheric pressure at different elevations and saturated vapor pressure above 20 degrees Celsius. However, when the water temperature is below 20 degrees Celsius, the saturated steam pressure is negligible.
　　
From the pipeline installation technology, the suction pipe requires strict sealing, can not leak, leakage, otherwise it will undermine the pump inlet vacuum, so that the water pump to reduce the amount of water is not even pumping in serious cases. Therefore, we should conscientiously do the work of the interface of the pipeline to ensure the construction quality of pipeline connection.
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