1. Characteristics of the medium: medium name, specific gravity, viscosity, corrosiveness, toxicity, etc.

2. What is the particle diameter and content of the solid contained in the medium.

3. Medium temperature: (℃)

4. The required flow rate for industrial pumps can generally ignore the leakage rate in the pipeline system during the process flow, but the impact of process changes on the flow rate must be considered. If agricultural pumps use open channels for water transportation, leakage and evaporation must also be considered.

5. Pressure: suction pool pressure, drainage pool pressure, pressure drop (head loss) in the pipeline system.

6. Pipeline system data (pipe diameter, length, type and number of pipeline accessories, geometric elevation from suction tank to pressure tank).

If necessary, a device characteristic curve should also be made. When designing and arranging pipelines, the following precautions should be taken:

1. Reasonable selection of pipeline diameter can result in small resistance loss under the same flow rate and small liquid flow velocity. However, the high price and small pipeline diameter can lead to a sharp increase in resistance loss, resulting in an increase in the head of the selected pump, an increase in belt power, and an increase in cost and operating expenses. Therefore, comprehensive consideration should be given from both technical and economic perspectives.

2. The discharge pipe and its joints should consider the maximum pressure they can withstand.

3. The pipeline layout should be arranged as straight as possible, minimizing the number of accessories in the pipeline and minimizing the length of the pipeline. When turning is necessary, the bending radius of the elbow should be 3-5 times the diameter of the pipeline, and the angle should be greater than 90 ° as much as possible.

4. The discharge side of the pump must be equipped with valves (ball valves or globe valves, etc.) and check valves. The valve is used to adjust the operating point of the pump, and the check valve can prevent the pump from reversing when the liquid flows backwards and prevent the pump from being hit by water hammer. (When the liquid flows backwards, a huge reverse pressure will be generated, causing damage to the pump)