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What you need to do measure up the piping system (line length, number of bends, static height (water level to water level)line size). See if where the product is going to, if the equipment requires any back pressure or disharge pressure), send all this to the pump vendors and let them take responsibility for the selection. The reason why the suction and discharge lines are bigger than the pump inlet and outlet is in order to keep the line velocity down, in order to reduce the occurance of cavitation. Typically you want to keep the suction velocity below 2 m/s (6.56 ft/s).
Regards,
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