positioning pumps

[AG1412]

In the attached, in figure 1, after the flow is collected in header pipe from all individual pipes, it must be pumped to at least 4m elevation.I know the frictional head losses in individual and header pipes. Based on this total head (static head+frictional head (converting into discharge pressure) I have to select pumps.

I am thinking to choose a pump at every individual pipe with a discharge pressure greater than the discharge pressure at the connection with header pipe. Is that correct?, If so, in order to pump 4 m height from header to the treatment system, where should the pump be located. Do I need to have a pump/lift station to do that? How do I develop a system curve for the pump that lifts flow from header to the treatment unit. Can I just consider the total flow in the header pipe as a design flow for plotting system curve?

In figure 2, when flows from two treatment units join together and to be pumped back to the tanks through a main distribution line, do I need to have a pump station? I know the frictional losses in the entire pipe network. How does pump arrangement in this case work?

If there is any textbook, design examples one knows to understand about this, please let me know.

 

[bimr]

Make yourself a P & ID drawing and note the pressures on the drawing.

 

[BigInch]

Design curves for each pump are needed, so a system curve should be made for each hydraulic circuit (or each branch) that includes a pump.

You'll need to add a pump wherever you need to add more head.

(?)

http://www.pumpfundamentals.com/images/tutorial/tutorial.pdf

 

[LittleInch]

I think you need to work out how you plan to control this and what your limits or requirements of flow are.

Trying to work out pumps with such low heads and multiple inlets is doomed to failure if these flows are tight.

Try looking at pd pumps topump your required flow and forget about pressure and matching pump curves and system curves.

Of course some numbers would help here....

My motto: Learn something new every day

Also: There's usually a good reason why everyone does it that way