how about pump model selection??

First, list the basic data:
1. Characteristics of the medium: medium name, specific gravity, viscosity, corrosivity, toxicity, etc.
2. The particle diameter and content of the body contained in the medium.
3. Medium temperature: (°C)
4. The required flow rate The general industrial pump can ignore the leakage in the pipeline system in the process flow, but must consider the impact on the flow when the process changes. Agricultural pumps that use open channels should also consider leakage and evaporation.
5. Pressure: suction tank pressure, drain pressure, pressure drop in the piping system (head loss).
6. Pipeline system data (pipe diameter, length, type and number of pipe attachments, geometric elevation of sink to pressure tank, etc.). The device characteristic curve should also be made if necessary. When designing the layout of the pipeline, you should pay attention to the following items:
A. Reasonably choose the diameter of the pipe, the diameter of the pipe is large, the flow velocity is small, the resistance loss is small, but the price is high, and the pipe diameter is small, which will lead to a sharp increase in the resistance loss and increase the lift of the selected pump. With increased power, both cost and operating costs increase. Therefore, it should be considered from a technical and economic perspective.
B. The discharge pipe and its pipe joints should take into account the maximum pressure that can be withstood.
C. The pipe arrangement should be arranged as a straight pipe as much as possible. Minimize the accessories in the pipe and minimize the length of the pipe. When turning, the bending radius of the elbow should be 3 to 5 times the diameter of the pipe, and the angle should be as large as 90. °C.
D. The discharge side of the pump must be equipped with a valve (ball valve or shut-off valve, etc.) and a check valve. The valve is used to adjust the operating point of the pump. The check valve prevents the pump from reversing when the liquid is reversed, and prevents the pump from hitting the water hammer. (When the liquid flows backwards, it will generate a huge reverse pressure, which will damage the pump)

Post time: Oct-28-2019
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