The basis for the selection of metering dosing pumps should be considered from five aspects according to the process flow and water supply and drainage requirements, such as liquid delivery volume, device head, liquid properties, piping layout, and operating conditions.

1. Flow rate of the metering dosing pump

Flow rate is one of the most important performance data of the metering dosing pump, and it is directly related to the production capacity and conveying capacity of the entire device. For example, the designer can calculate the normal, minimum and maximum flow rates of the pump in the process design. When selecting the pump, take the maximum flow as the basis and take into account the normal flow. When there is no maximum flow, usually 1.2 times the normal flow can be taken as the maximum flow.

2. The head (pressure) of the metering dosing pump

The head (pressure) required by the dosing device system is another important performance data for pump selection. The conditions of electromagnetic pumps and mechanical pumps are different. Generally, electromagnetic pumps do not need to be large, but 1-1.1 times is good. The flow rate of the mechanical pump is less affected by the head, and the selection is mainly based on the flow rate.

3. Liquid properties of the metering dosing pump

Liquid properties include 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 relates to the lift of the system, the effective calculation of gas surplus and suitable pump type: chemical nature, mainly refers to the chemical corrosivity and toxicity of the liquid medium, which is an important basis for the selection of pump materials and shaft seal.

4. The piping layout conditions of the metering dosing pump

The piping layout conditions of the dosing device system refer to some data such as the height of the liquid supply, the distance of the liquid, the direction of the liquid, the lowest liquid level of the suction end, the highest liquid level of the discharge outlet, etc. and some data and the pipe specifications and their length, materials. Therefore, the lift is calculated and the cavitation allowance is checked.

5. Operating conditions of the metering dosing pump

Operating conditions include many contents, such as liquid operation T saturated steam power P, suction side pressure PS (absolute), discharge side container pressure PZ, altitude, ambient temperature, whether the operation is intermittent or continuous, and the pump position is fixed or removable.

Based on the above metering dosing pump selection basis, we can easily select the appropriate metering dosing pump according to our needs. After strictly following the basis of metering dosing pump selection, we should pay attention to that the selected metering dosing pump should be as small and cheap as possible, with good characteristics, long service life, stable operation, and low operating costs.

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