How to understand split case pumps correctly?

Split case pump can also be called single stage double suction split case pump, and its main feature is the large flow rate of transmission medium. The impeller is installed inside the pump case, and fixed to pump spindle. Pump spindle is drived diretly by electrical machine. There is a liquid suction tube at the center of the pump case. Liquid enters into the pump through bottom valve and suction tube, and the liquid exhaust port is connected with the discharge pipe. When the pump's rotate speed is constant, the pressure head and flow rate are about the diameter of impeller.

Split case pump is a general mechanical equipment that can be widely used in oil, chemical industry, electric power, mine, shipbuilding, light industry, agriculture, civil use and national defense department etc, so it plays an important role in national economy. To select the split case pumps reasonably, we have to consider those economic indicators including the operation costs of pump set and pump station, and makes it conforms to economic, safe and pratice principles. To be specific, there are four aspects that you should take into consideration.
1. It must meet the requirements of flow rate and lift. We must keep the split case pump running efficiently, so that it can not only save power but also makes the machine parts more durable.
2. The split case pump should not only meet the requirements of small volume, light weight and cheap cost, but also have good characteristic and high efficiency.
3. It needs to have good resistant to capitation erosion, long span life and stable operation.
4. The pump project should feature lower cost and less investment.