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Principles for selecting water pumps: 1. The type and performance of the water pump must meet the requirements of process parameters such as flow rate, head, pressure, temperature, net positive suction head, and suction lift. 2. It must meet the specific requirements of the medium being transported. 3. For pumps used to transport flammable, explosive, toxic, or valuable media, it is required that the shaft seal be reliable, or that leak-free pumps be used. 4. For pumps used to transport corrosive media, the flow-through components are required to be made of corrosion-resistant materials. 5. For pumps used to transport media containing solid particles, the flow-through components must be made of wear-resistant materials; where necessary, the shaft seals should be flushed with a clean liquid. 6. In terms of mechanics, it features high reliability, low noise, and minimal vibration. 7. The material of the pump must be suitable for the conditions at the installation site; it’s not true that the more expensive the material, the better. 8. In terms of cost, it is necessary to take into account the expenses for equipment procurement, operation, maintenance, and management, with the goal of minimizing the overall cost. Basic criteria for selecting water pumps: 1. The basic criteria for selecting water pumps should be determined based on the process flow and water supply/distribution requirements, taking into account five aspects: liquid flow rate, head required by the system, properties of the liquid, piping layout, and operating conditions. 2. The liquid flow rate, or throughput, is usually determined based on the maximum flow rate, while also considering the normal flow rates. In the absence of a maximum flow rate, 1.1 times the normal flow rate is usually taken as the maximum flow rate. 3. The head of the unit, that is, the lift capacity, should generally be determined by selecting a value that is 5%-10% higher than the actual required head. 4. Liquid properties, including the name of the liquid medium, physical properties (temperature, viscosity, particulates, etc.), chemical properties (corrosivity, pH, thermal stability, etc.), and other properties. 5. Pipeline layout refers to the liquid delivery height, distance, direction, length, and material of the pipelines, etc., in order to calculate pipeline losses and verify the net positive suction head. 6. Operating conditions, such as altitude, ambient temperature, whether the water pump operates intermittently or continuously, and whether the pump’s position is fixed or movable.