I am in the process to install a water booster system in our factory. Our water supply to our factory is (300Kpa) I need to install a booster system in order to obtain 600Kpa at a consistent rate. We have a 50mm galvanized water supply and we use average 12000 liters per hour. What size pumps should I install and what size electric motors should I install? I would like to install a make-up tank before the booster system.

All you need is a pump with flow of 12 cubic meter flow and 6 bar pressure. If you buy a branded pump ,it will come with a standard motor. You can instal a horizontal centrifugal pump also or a vertical booster pump.