You can also just select a couple pump companies, send them the specifications you need (flow, head, fluid, envelope, etc) and let them design it for you. Chances are, someone already has exactly what you're looking for, designed with a lot of experience. Keep the wheels on the ground
Bob
showshine@aol.com
A good software if you need to design pumps and simulate them in their environement is AMESim (at least, this is the one I use and it works pretty nice)