1.Media Properties: Media name,Proportion,Viscosity,Corrosion,Toxicity etc..

2.Contained in the media because of the particle diameter, content how many.

3.Medium temperature:(^oC)

4.The required flow

The general industrial pump can be ignored in the process of the pipeline leak in the system, but must take into account changes in technology have an impact on patronage. If the agricultural is a matter uses the open canal water distribution, must also consider the leakage and evaporation.

5.Pressure: Pool suction pressure, Drainage pond pressure, Pipeline system in the pressure drop（Head loss）.

6.Pipeline System Data (Caliber、Length、Annex pipeline type and number, Suction pool to pressure pool the geometry elevation etc.)

  If needs should also make the device characteristic curve.

  When design layout pipeline, we should pay attention to the following item:

A.        A reasonable choice pipeline diameter, the pipeline diameter is big, in the same flow, the liquid flow rate is small, the resistance loss is small, but price is high, the pipeline diameter is small, will lead to the resistance loss to increase rapidly, so that the selected pump’s lifting to increase, matches the belt power to increase, the cost and the operating cost all increase. Therefore should from technical and the economical angle consideration.

B.        From the pipe and fittings should be considered to bear the greatest pressure.

C.        Pipeline layout should arrange to become the straight tube as far as possible, reduces in pipeline’s appendix and reduces the pipeline length as far as possible, when must make turn, the bend radius of the bend diameter pipeline should be 3~5times,the angle as far as possible greater than 90^oC.

D.       The pump must be installed from the side of the valve (ball valve or cut-off valve etc.) and the check valve. Pump valves used to regulate the working conditions, the check valve when the valve to prevent backflow of liquid in the pump reverse, and pumps to avoid water hammer blow.(When liquid flows backwards, the reverse will have a tremendous pressure to pump damage)

 

Determine the flow

a.       If the production process has given the minimum, normal, the maximum rate of flow, should be considered the maximum flow.

b.       If the production process only gives the normal flow, should be considered a cushion left.

To ns>100 of the element of its large flow of low-life pumps, the margin takes 5%, to ns<50 of the small flow and pump lifted, the margin takes 10%, 50=<n=<100 of the pumps, the margin also takes 5%, the operating conditions of poor quality and bad pumps, the margin should take 10%.