According to the principle of pump selection, using a reasonable pump selection method can extend the service life of pump products, improve pump efficiency, and reduce energy consumption. Ultimately achieving the selection of economical, efficient, and energy-saving water pumps
Principles: Economy, efficiency, and energy conservation.
1、 Economic principle: Select the most appropriate pump material and pump type based on the specific gravity, viscosity, corrosiveness, and other characteristics of the medium, in order to ensure the service life of the pump.
2、 Efficiency principle: Choose high-efficiency water pumps as much as possible, and when the performance parameters are also suitable, choose large pumps as much as possible, because large pumps are more efficient than small pumps.
3、 Energy saving principle: Try to use the pump at or near its rated operating conditions as much as possible, which can improve the operating efficiency of the pump. In addition, full consideration should be given to the situation when pumps work together, and efforts should be made to maintain high efficiency of the water pump in various situations.
Methods for selecting water pumps
List the basic data:
1. Characteristics of the medium: medium name, specific gravity, viscosity, corrosiveness, toxicity, etc.
2. What is the particle diameter and content of the substance contained in the medium
3. Medium temperature
4. Required traffic
5. Pressure: suction tank pressure, drainage tank pressure, pressure drop (head loss) in pipeline system
The determination of flow rate is one of the important performance data for pump selection, which directly affects the production and transportation capacity of a device. When selecting a pump based on the maximum flow rate and considering the normal flow rate in the process design of the design institute, 1.1 times the normal flow rate is usually taken as the maximum flow rate when there is no maximum flow rate. The head required for the device system is another important performance data for selecting pumps, and generally the head should be selected by amplifying the margin by 5% to 10%.
The material of the pump must meet the requirements of the medium properties: liquid properties, including the name of the liquid medium, physical properties, chemical properties, and other properties. The physical properties include temperature C, density d, viscosity u, diameter of the dielectric grains, and gas content, which involve the system's head, effective cavitation residual calculation, and appropriate pump type; Chemical properties mainly refer to the chemical corrosiveness and toxicity of liquid media, which are important criteria for selecting pump materials and choosing which type of shaft seal.
Determine the type of pump based on the layout of the device, terrain conditions, water level conditions, and operating conditions, and choose horizontal, vertical, and other types of pipeline, submersible, submersible, unobstructed, self-priming, and gear pumps.
