Centrifugal pump and multi-stage pump modeling commentary

Pump selection basis, should be based on the process flow, water supply and drainage requirements, from five aspects to be considered, both liquid delivery volume, device lift, liquid properties, piping layout and operating conditions.

1. Flow rate is one of the important performance data for 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 consideration. In the absence of the maximum flow rate, the normal flow rate can generally be taken as 1.1 times the maximum flow rate.

2. The required head of the device system is another important performance data of the pump selection. Generally, the head should be selected 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 other data and pipeline 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.

This series of pumps is suitable for industrial and urban water supply and drainage, pressurized water supply for high-rise building water towers, fire booster, pipeline booster, long-distance water supply, heating and refrigeration cycle and other occasions. This series of pumps has the advantages of stable operation, reliability, low noise, wide application range, etc. It is an ideal single-stage single-suction centrifugal pipeline circulation booster pump.

This series of pumps is based on the international ISO2858 standard, and adopts the latest hydraulic model, while referring to the relevant international standards developed and designed to become an alternative product of the SG-type pipeline pump. Its adopted technical standards, performance parameters, test methods, etc. are all effective in adopting ISO international standards related to IS type centrifugal pumps, and have basically the same performance parameters as those of GDL centrifugal pumps and DL multi-stage pumps, and their performance indexes all meet the design requirements.