The appearance is different: the vertical multistage pump is standing, while the horizontal multistage pump is lying horizontally.
The connection mode is different: the vertical multi-stage pump is superposed and connected from bottom to top, the horizontal pump is arranged vertically on the base, and the vertical multi-stage pump is called a pipeline pump such as a vertical pipeline centrifugal pump, and the motor and the pump body are connected by a sub-port; The pump is connected to the motor by a coupling and needs to be regularly corrected.
Different floor space: The vertical multi-stage pump has a small footprint and the horizontal multi-stage pump has a large footprint. The vertical multi-stage pump set occupies less than the horizontal pump and does not have to be laid; the horizontal multi-stage pump set has a base and the foundation is to be laid.
Different maintenance difficulty: Vertical pump maintenance is difficult. For example, the inspection of the impeller needs to remove all the upper parts before it can be carried out. The horizontal pump is relatively easy. For example, the IS type pump can remove the inlet tube and perform the impeller maintenance.
Different installation modes: The vertical pump is connected as a whole, and the installation is easy; the horizontal pump needs to be adjusted after installation.
In general, multistage pumps are usually horizontal, and in the following cases, vertical multistage pumps are required.
1) Where the water level changes greatly, the pump should be installed at a low water level. In this case, the vertical type can reduce the pumping station area and reduce the earthwork. Reduce infrastructure investment. Large single-suction centrifugal pumps and axial pumps are mostly vertical.
2) Pumping deeper groundwater. Liquids such as oil or brine require a vertical deep well pump.
3) Another reason for the large single suction pump to be vertical is that it can be lubricated with water with a simple structure. At this time, the load of the water-lubricated bearing is small, and the wear is light and the bearing life is increased.
4) Some high-pressure small-flow pumps, due to the large number of stages, the slender pump shaft, are prone to unstable operation. One of the measures to change this situation is to use a vertical pump and subject the pump bearing to a certain tensile force.
5) Use the bit energy to increase the NPSH at the impeller inlet. The pump places the first stage impeller inlet at the lowest position, such as a vertical condensate pump.
6) The footprint of the pump is limited, such as a marine pump.
