1. From the installation technology of the pipeline centrifugal pump, the suction pipe requires strict sealing, and no air or water leakage, otherwise it will destroy the vacuum at the water inlet of the water pump, reduce the water output of the water pump, and even fail to pump water in severe cases. Come. Therefore, it is necessary to do a good job in the joint work of the pipeline carefully to ensure the construction quality of the pipeline connection.
2. Determine the height of the pump device (ie suction lift). This height refers to the vertical distance between the water surface of the water source and the center line of the pump impeller. It should not be confused with the allowable vacuum height. The allowable vacuum height indicated on the pump product description book or nameplate refers to the vacuum value on the section of the water inlet of the pump. And it is measured by stopping the experiment under normal atmospheric pressure and water temperature of 20 degrees Celsius. It did not think about the water flow after the suction pipe was installed. And the height of the water pump device should be the partial value that is left after the vacuum height is allowed to suck up and the loss head of the suction pipe is deducted. It should restrain the actual topographic water absorption height. The height of the pump device cannot exceed the calculated value, otherwise, the pump will not be able to pump water.
3. It should be pointed out that when the head and water temperature of the pipeline centrifugal pump installation site are different from the experimental conditions, if the local altitude is above 300 meters or the water temperature of the pumped water exceeds 20 degrees Celsius, 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 degrees Celsius. However, when the water temperature is below 20 degrees Celsius, the saturated steam pressure can be neglected.
4. The size that affects the calculated value is the resistance loss head of the suction pipe. Therefore, it is advisable to use the shortest pipeline layout, and install as few elbow fittings as possible. It is also possible to properly configure a larger diameter water pipe to reduce the flow rate in the pipe.
Post time: 2022-01-06
