Selection of long shaft pumps
Release time:
2022-07-27
Source:
The long shaft pump is a type of centrifugal pump. From the perspective of centrifugal pumps, the performance of liquid pumps has been improved, making it far superior to liquid pumps and operating more stably. Based on market demand, the company has developed the VT series long shaft deep well pump, which is widely used in industrial enterprises such as water supply companies, sewage treatment plants, power plants, steel mills, and mines, as well as in municipal water supply and drainage, flood control, and urban waterlogging projects.
The long shaft pump is a type of centrifugal pump. From the perspective of centrifugal pumps, the performance of liquid pumps has been improved, making its performance far superior to that of liquid pumps, and its operation is more stable. Based on market demand, the company has developed the VT series long shaft deep well pumps, which are widely used in industrial enterprises such as water supply companies, sewage treatment plants, power plants, steel mills, and mines, as well as in municipal water supply and drainage, flood control, and internal flooding projects.
How to select a long shaft pump:
1. Determine the type of pump based on well diameter and water quality. Different types of pumps that affect corporate culture have specific requirements for the size of well bore diameter and national development. The overall design dimensions of the pump should be smaller than the well diameter by 25 to 50 mm. If the well bore is inclined, the maximum structural dimensions of the pump should also be smaller. In short, the pump body should not be too close to the inner wall of the well to prevent vibration from damaging the well.
2. Select the flow rate of the well pump based on the water output of the well. Each well has an optimal flow rate for economic purposes. When the water level in the well drops to half of its depth, the flow rate of the pump should be equal to or less than this flow rate. If the pumping volume exceeds this amount, it can cause collapse and sedimentation of the well wall, affecting its lifespan and efficiency. Therefore, a better approach is to conduct pumping tests on the well and select the pump flow rate based on the maximum water output that the well can provide.
3. Lift height of long shaft deep well pumps. Determine the actual lift required by the well pump based on the drop in water level and head loss in the water transport system pipeline. This lift is equal to the vertical distance from the water level to the surface of the discharge pool (net lift) plus any economic loss in lift. Head loss is generally about 6-9% of head loss, typically around 1-2m. The depth of water at the lower impeller should be between 1 to 1.5m. The total length of the underground part of the pump should not exceed the maximum length specified in the pump manual.
It is important to note that wells with a sand content exceeding one ten-thousandth are not suitable for installation using deep well pumps. Excessive sand content in well water, such as over 0.1%, will accelerate wear on rubber bearings, cause vibration in pump systems, and shorten pump lifespan.
Long shaft pumps with submersible impellers are selected for vertical installation. They are compact, stable, easy to operate, convenient to maintain, and have a significantly reduced installation area. They benefit from high generalization and standardization advantages. The design and production of vertical long shaft pumps have absorbed advanced experiences from developed countries around the world. These vertical long shaft pumps for industrial water supply and drainage are suitable for urban drinking water, fire protection for daily life, as well as for river, lake, and seawater intake applications; they are also applicable in industrial parks such as metallurgy, mining, chemical engineering, papermaking, and hydropower generation.
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