Fluorine-lined centrifugal pumps are generally centrifugal pumps lined with fluoroplastics. They can be easily inspected and replaced internally on a daily basis without disassembling the pump inlet and outlet pipes. However, the prerequisite is that the installation process of the fluorine-lined centrifugal pump must understand the key to the installation technology. Here are four must-know items about the installation technology of fluorine-lined centrifugal pumps, which may save you a lot of unnecessary trouble in the future.
1. The key to the installation technology of fluorine-lined centrifugal pumps is to determine the installation height (i.e. suction head) of fluorine-lined centrifugal pumps. This height refers to the vertical distance from the water surface to the center line of the impeller of the fluorine-lined centrifugal pump. It cannot be confused with the allowable suction vacuum height. The allowable suction vacuum height indicated on the product manual or nameplate of the fluorine-lined centrifugal pump refers to the vacuum value on the water inlet section of the fluorine-lined centrifugal pump, and it is measured by testing at 1 standard atmospheric pressure and a water temperature of 20 degrees Celsius. It does not take into account the water flow conditions after the water suction pipe is matched. The installation height of the fluorine-lined centrifugal pump should be the remaining value after the allowable suction vacuum height is deducted from the loss head of the water suction pipe. It must overcome the actual terrain water suction height. The installation height of the fluorine-lined centrifugal pump cannot exceed the calculated value, otherwise the fluorine-lined centrifugal pump will not be able to pump water.
2. The influence of the calculated value is the resistance loss head of the suction pipe. Therefore, it is advisable to adopt the shortest pipeline layout and install as few elbows and other accessories as possible. It is also possible to consider appropriately matching larger diameter water pipes to reduce the flow rate in the pipe.
3. It should be pointed out that in chemical pumps, when the elevation and water temperature of the installation site of the fluorine-lined centrifugal pump are different from the test conditions, such as the local altitude of more than 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 at a water temperature higher than 20 degrees Celsius. However, when the water temperature is below 20 degrees Celsius, the saturated steam pressure can be ignored.
4. From the perspective of pipeline installation technology, the suction pipe requires strict sealing, and no air or water leakage, otherwise it will destroy the vacuum at the water inlet of the fluorine-lined centrifugal pump, reduce the water output of the fluorine-lined centrifugal pump, and even fail to pump water in severe cases. Therefore, the interface work of the pipeline should be done carefully to ensure the construction quality of the pipeline connection.