How to select a submersible pump: The medium can be used to preliminarily determine the type! For example, a slurry pump or a water pump! Whether the medium is corrosive or not, choose the appropriate material. The depth and operating conditions of the pool determine the length and structure of the submersible pump! For example, the pump head at the bottom of the pool should be properly supplemented with a suction tube! The flow rate determines the diameter of the delivery pipe, and the distance and height difference determine the head! The motor power is the last! The selection of a submersible pump should be based on the process flow, water supply and drainage requirements, and should be considered from five aspects: liquid delivery volume, device head, liquid properties, pipeline layout, and operating conditions.
Flow rate is one of the important performance data for selecting a submersible pump, which is directly related to the production capacity and delivery capacity of the entire device. When selecting a pump, the large flow rate is used as the basis, taking into account the normal flow rate. When there is no large flow rate, 1.1 times the normal flow rate can usually be taken as the large flow rate. The head required by the device system is another important performance data for selecting a submersible pump. Generally, the head after enlarging the margin by 5%-10% is used for selection. The piping layout conditions of the submersible pump system refer to the liquid delivery height, liquid delivery distance, and liquid delivery direction, so as to calculate the system head and check the cavitation margin.
The selection of submersible pumps should also pay attention to the properties of the liquid, including the name of the liquid medium, physical properties, chemical properties and other properties. The physical properties include temperature c, density d, viscosity u, solid particle diameter and gas content in the medium, etc. This involves the system head, effective cavitation margin calculation and the type of suitable pump: chemical properties, mainly referring to the chemical corrosiveness and toxicity of the liquid medium, are important bases for selecting submersible pump materials and which type of shaft seal to choose. There are many operating conditions for submersible pumps, such as the liquid's operating T, saturated steam force P, suction side pressure PS, discharge side container pressure PZ, altitude, ambient temperature, whether the operation is intermittent or continuous, and whether the pump position is fixed or movable.