The influence of medium physical properties on pumps
When choosing a pump type and material, it is necessary to select a suitable pump type and material according to the characteristics of the medium to ensure the normal operation of the pump and extend the service life of the pump.
1. The influence of viscosity
The viscosity of the medium refers to its resistance to flow and is one of the important indicators of the physical properties of the medium. When the viscosity of the medium increases, the suction resistance and discharge resistance of the pump will increase, resulting in the operation of the pump being restricted. In addition, viscosity will also affect the performance of the pump, including flow rate, head, etc.
Therefore, when choosing a pump, it is necessary to select a suitable pump type and material according to the viscosity of the medium. In general, a centrifugal pump should be selected for a liquid with low viscosity, and a submersible pump or a self-priming pump should be selected for a liquid with high viscosity.
2. The influence of specific gravity
The specific gravity of the medium refers to the ratio of the density of the medium to the density of water. Changes in the specific gravity of the medium will affect the head and flow of the pump. When the specific gravity of the medium increases, the head of the pump will increase, while the flow rate will decrease. Conversely, when the specific gravity of the medium decreases, the head of the pump will decrease and the flow rate will increase.
For media with different specific gravities, suitable pump types and materials can be selected. For example, for media with a specific gravity greater than 1, it is necessary to select acid-resistant materials, such as 316L stainless steel, to prevent corrosion. At the same time, it is also necessary to select a high-lift pump type to meet the medium transportation requirements.
3. The influence of temperature
The medium temperature refers to one of the thermodynamic properties of the medium. Temperature changes will cause changes in the physical properties of the medium, such as viscosity, density, and thermal expansion coefficient, thereby affecting the operation of the pump. When the medium temperature rises, the pump head and flow rate will decrease, and the efficiency will decrease; conversely, when the medium temperature drops, the pump head and flow rate will also increase, and the efficiency will increase.
The material of the pump must be selected according to the temperature range of the medium. For pumps that transport high-temperature liquids, high-temperature resistant materials such as steel and stainless steel are usually required. At the same time, during the use of the pump, it is also necessary to regularly check the pump's sealing and lubricant to ensure the normal operation of the pump.
