Centrifugal pumps are divided into vertical pumps and horizontal pumps according to their structural forms. The characteristics of vertical pumps are: less floor space, small construction investment, and convenient installation. The disadvantages are: high center of gravity, not suitable for operation without fixed footings. The characteristics of horizontal pumps are: wide range of applicable occasions, low center of gravity, and good stability. The disadvantages are: large floor space, large construction investment, large volume, and heavy weight. For example, vertical pumps include CFL vertical centrifugal pumps, DL vertical multistage pumps, and submersible electric pumps. Horizontal pumps include CFW pumps, D-type multistage pumps, SH-type double suction pumps, B-type, IH-type, BA-type, IR-type, etc. According to the requirements of head and flow rate and the number of stages composed of the impeller structure:
A. Single-stage single-suction pump: The pump has one impeller with one suction inlet. The general flow range is 5.5-300m2/h, H is 8-150 meters, with small flow and low head.