Centrifugal pump installation technology is the key to determining the pump installation height. This height refers to the vertical distance from the water surface of the water source to the center line of the pump impeller. It is not confused with the allowable vacuum height. The allowable vacuum height indicated on the pump nameplate or product manual means the vacuum value on the cross section of the water inlet of the pump, Is at 1 standard atmospheric pressure; water temperature of 20 degrees Celsius, the test was measured. It does not consider the condition of the water flow after the water supply pipe is matched. 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. In addition, the impact of 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 the appropriate with some larger diameter pipes to reduce the flow rate within the pipe. It should be noted that the pump installation site elevation and water temperature is different from the test conditions, such as the local elevation of 300 meters 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 pipe installation technology, the suction pipe requires strict sealing, can not leak, leakage, otherwise it will undermine the pump inlet of the vacuum, so that the water pump to reduce the amount of water is not pumping even 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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