Pump sizing software

Hello, I am looking for a good software that will help me design systems such as pumping from a tank through an eductor and back to the same tank or another tank. I have tried PSIM but it seems limited in then number of items to install. some of my cases will involve pumping to a tank that has 16 or 20 eductors in the tank to flow thrugh at certain pressures. i want something that I will be able to be trained on if need be.