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Corrosion resistant pump installation technology

12 Jan 2021Email

1. The key to the installation technology of corrosion-resistant pumps is to determine the installation height of the corrosion-resistant pumps (ie suction lift). This height refers to the vertical distance from the water surface of the water source to the center line of the impeller of the corrosion-resistant pump. It should not be confused with the allowable vacuum height. The allowable vacuum height indicated on the corrosion-resistant pump product manual or nameplate refers to the section of the water inlet of the corrosion-resistant pump. The vacuum value above is measured by testing under 1 standard atmospheric pressure and water temperature of 20 degrees Celsius. It does not consider the water flow after the suction pipe is installed. The installation height of the corrosion-resistant pump should be the value of the remaining part of the value after the vacuum height is allowed to suck up and the loss of the suction pipe is deducted. It must overcome the actual topographic water absorption height. The installation height of the corrosion-resistant pump should not exceed the calculated value, otherwise, the corrosion-resistant pump will not be able to pump water.

 

  2. The magnitude that affects the calculated value is the resistance loss head of the suction pipe. Therefore, it is advisable to adopt a shorter pipeline layout and install as few fittings as elbows. It is also possible to consider appropriately matching a larger diameter water pipe to reduce the flow velocity in the pipe.

  3. It should be pointed out that when the elevation and water temperature of the corrosion-resistant pump installation site are different from the test conditions, if the local altitude is above 300 meters or the temperature of the pumped water exceeds 20 degrees Celsius, the calculated value shall 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 is negligible.

4. From the perspective of pipeline installation technology, the suction pipeline requires strict tightness, and cannot leak air or water, otherwise the vacuum at the inlet of the corrosion-resistant pump will be damaged, and the water output of the corrosion-resistant pump will be reduced. Come on the water. Therefore, it is necessary to do a good job in the joint work of the pipeline carefully and maintain the construction quality of the pipeline connection.

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