pump solution

B Chalwe - Welcome to this forum.

You do not give enough information for anything more than a general answer.

As your request involves municipal services I assume that you are pumping (relatively clean) water. In which case I would limit pump suction velocities to about 0,6 m/s for 10 m^3/hr to around 2 m/s for around 1000 m^3/hr. You can interpolate for figures between. Does not have to be exact, these are good general numbers. Discharge velocities would then be from around 1,5 m/s to 4 m/s for the same flow range.

Economics may dictate that you allow higher velocities so as to use smaller bore piping, but long term reliability may be compromised.

If you are pumping something else, different velocities will apply. (For example when pumping sulphuric acid you would limit velocities to well below 1 m/s).

The second part of your question is too vague and broad, unless someone is wanting to write a book. Be more specific and we will see if we can help.