Go into Spirax Hookup - the chapter on selecting & sizing centrifual pumps or any pump manufacturer's selection catalogs, work out all the total heads ( all pipes, valves, fittings, vertical lifts, running length) mark it up as per manufacturer's recommendations to arrive at grand total head. Go to sizing chart read Head Vs Flow Gpm & select the size of the pump. Contact the Manufacturer with the selection and he will gladly help you out with the right pump.