Analysis of pump selection in China

1. Flow rate is one of the important performance data of pump selection. It is directly related to the production capacity and conveying capacity of the entire device. For example, in the process design of the design institute, the normal, minimum and maximum flow rates of the pump can be calculated. When the pump is selected, the maximum flow rate is taken as the basis, and the normal flow rate is taken into account. When there is no maximum flow rate, it is usually possible to take 1.1 times of the normal flow rate as the maximum flow rate.

2. The required lift of the device system is another important performance data of the pump selection. Generally, it is necessary to select the head after amplification with 5%-10% margin.

3, liquid properties, including the liquid medium name, physical properties, chemical properties and other properties, physical properties of the temperature c density d, viscosity u, the diameter of the solid particles in the medium and the gas content, which involves the system's lift, effective gas Corrosion margin calculation and the type of suitable pump: chemical properties, mainly referring to the chemical corrosivity and toxicity of the liquid medium, is an important basis for choosing the pump material and the type of shaft seal.

4. The pipeline layout conditions of the installation system refer to the liquid-feeding distance of the liquid-feeding distance, the suction of the minimum liquid level, the maximum liquid level of the discharge side, and some data and pipe specifications, and their lengths, materials, and pipe fittings specifications. Etc. for the check of the combing head calculations and the NPSH margin.

5, the operating conditions of many content, such as liquid operation T saturated steam force P, suction side pressure PS (absolute), discharge side container pressure PZ, altitude, ambient temperature operation is a gap or continuous, the pump position is fixed It's still removable.

Far East Centrifugal Pump Tip: Based on the above pump selection basis, we can easily select the right pump according to our own needs. After strictly following the selection criteria of the pump, we must pay attention to the fact that the selected pump should be as small as possible, inexpensive, with good characteristics, long service life, stable operation, and low operating costs.