Vertical pipeline pumps should consider: liquid transport volume, head, liquid properties, pipeline placement and operating conditions.

 

　　 1. The flow rate is directly related to the production capacity and transportation capacity of the entire device. For example, the design process can calculate the normal, minimum and maximum flow rates of the pump. When selecting the pump, take the maximum flow rate as the basis, taking into account the normal flow rate. When there is no maximum flow rate, usually 1.1 times the normal flow rate can be taken as the maximum flow rate. Flow rate is one of the important performance data for pump selection.

 

　　2. The head is generally selected by the head after magnifying 5%-10% of the margin. Another important performance data for pump selection is the head.

 

　　3. Liquid properties, including the name of the liquid medium, physical properties, chemical properties and other properties. a. The physical properties include temperature c, density d, viscosity u, solid particle diameter and gas content in the medium, etc. This relates to the head of the system, the effective cavitation allowance calculation and the type of suitable pump.

 

　　B. Chemical properties mainly refer to the chemical corrosiveness and toxicity of the liquid medium. It is an important basis for the selection of pump materials and the selection of which type of shaft seal.

 

4. The installation conditions of the pipeline refer to the liquid feeding height and the liquid feeding interval, the lowest liquid level on the suction side, the highest liquid level on the discharge side, etc. Some data and pipeline standards and their length, data, pipe fitting standards, quantity, etc. Carry out system comb head calculation and cavitation margin check.

 

5. There are many operating conditions, 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 position of the pump is fixed The ones are still removable.