The key installation technology of centrifugal pump

When it comes to installing a pipeline centrifugal pump, one of the crucial factors is determining the installation height, also known as the suction stroke. This refers to the vertical distance from the water surface of the water source to the center line of the impeller of the centrifugal pump. It's important to note that this height should not be confused with the allowable vacuum suction height.

The allowable suction height, as indicated on the pump product manual or nameplate, pertains to the vacuum value on the water inlet section of the pump. This value is determined through tests conducted under specific conditions, such as 1 standard atmosphere and a water temperature of 20°C. However, it does not take into account the water flow conditions after the suction pipe is matched.

To correctly determine the installation height of the pump, it is necessary to deduct the loss of the suction pipe from the allowed vacuum height. Additionally, one must consider the actual terrain water absorption height, which the installation height of the water pump must overcome. It is crucial not to exceed the calculated installation height, as it may render the centrifugal pump unable to effectively pump water.

One important factor that affects the calculated value is the resistance loss head of the suction pipe. Therefore, it is advisable to opt for the shortest pipeline layout and minimize the use of fittings like elbows. Additionally, utilizing a larger diameter water pipe can help reduce the flow velocity, ensuring optimal performance.

In summary, determining the installation height of a pipeline centrifugal pump is crucial for efficient operation. By considering factors such as the allowable vacuum suction height, loss of the suction pipe, and actual terrain water absorption height, one can successfully install the pump and avoid potential issues.

It is important to note that when installing a pipeline centrifugal pump, the elevation and water temperature of the site can have a significant impact on its performance. If the site is located at an altitude of over 300 meters or the water temperature exceeds 20℃, the calculated value needs to be adjusted. This entails taking into account the atmospheric pressure variations at different altitudes and the saturated vapor pressure when the water temperature is higher than 20℃. However, if the water temperature is below 20℃, the saturated vapor pressure is not considered a significant factor.

In terms of installing pipelines, it is crucial to ensure the suction pipeline is well-sealed to prevent any air or water leakage. If the vacuum degree at the water inlet of the centrifugal pump is compromised by leaks, it could result in reduced water output or even a total inability to pump water. To avoid such incidents, it is important to prioritize the pipeline interface and ensure the quality of the construction of its connection.