What are the characteristics of the submersible pump?

(1) The pumping station is not afraid of flooding

For the low-lying areas, the drainage pumping stations are often flooded in the case of dike breaches or excessive heavy rains exceeding design standards. Once the electromechanical equipment of the pumping station is soaked in water, the repairing work such as cleaning and baking is very large, which will delay the drainage time and increase the disaster loss. Therefore, the flood control and moisture proof problem of the conventional pumping station itself is also one of the most important issues. However, the submersible pump uses a submersible motor, which can be operated underwater. Therefore, even if the pumping station is flooded, as long as the motor is not overloaded, the pump can work in the stable zone and the submersible pump can be put into operation at any time.

(2) Unit disassembly and assembly is fast

In the past, submersible pumps and outlet pipes were bolted, and deep well submersible pumps were mainly used for deep well water lifting and small construction drainage. However, the automatic coupling between the submersible electric pump and the water outlet pipe has been realized. When the outlet pipe is fixed, the pump unit can be quickly installed and disassembled without bolts, thereby greatly speeding up the installation and maintenance speed of the unit. For example, the Ye Sandiao pumping station in Zhangzhou, Hebei Province, each conventional 1.4 m vertical axial pump unit is installed for 15 to 20 days, while the submersible pump with the same caliber is only one day. For small submersible pump units, installation and disassembly are more convenient, and some can be installed or disassembled in just one hour. This is very advantageous for pump stations that require emergency disassembly and assembly, such as flood control and drainage.

The main installation types of current large-caliber submersible pumps are wellbore type and rail type. The main installation method for axial flow and vane mixed flow submersible pumps is the wellbore type. The wellbore type has a suspension type, a curved tube type, a floor type, an open type, and the like. For different types of inlet passages, a common type submersible electric pump can also be used.

(3) Pumping station project investment province

Pump station engineering investment includes civil construction investment and equipment investment. With the use of submersible pumps, both civil investment and equipment investment can be reduced.

Civil construction investment. Due to the following reasons, the civil construction investment of the submersible pumping station is 30%~50% lower than that of the conventional pumping station.

1 Submersible pump unit can be operated underwater, not afraid of wind and rain, and can save the upper structure of the pump house.

2 The pump of the submersible pump is coaxial, the axial dimension is small, and the lifting height of the pump is small. Even if the superstructure needs to be built, the height is lower than that of the conventional pumping station.

3 For the pump station that needs the standby unit, only the standby submersible pump unit is needed, and the position of the standby unit is not required, so that the length of the pump room can be reduced.

4 Submersible pumping stations do not require investment in water supply pumps, drainage pumps, direct-connected vacuum pumps, and fan equipment. Due to the high requirements for sealing, insulation and cooling of submersible pumps, there are many monitoring equipments in the unit. The cost of submersible pumps is usually higher than that of conventional units. However, because the submersible pump can save a lot of auxiliary equipment, the equipment investment of the submersible pump station is still lower than that of the conventional pump station.

(4) High reliability and long service life

Compared with conventional pumping station equipment, the submersible pump has fewer auxiliary equipment, which not only simplifies the operation procedure, but also facilitates automation, and can greatly reduce the probability of failure, so that the reliability of the equipment is significantly improved. At the same time, because the modern sealing, insulation, cooling and other technologies have developed rapidly, the submersible pump is not prone to failure. Even if there are seal leakage, excessive temperature rise, and insulation degradation, various sensors will transmit the signal in time and control and protect it. Therefore, the submersible pump has high reliability. In addition, since the submersible pump is easy to install and disassemble, it can be lifted during the non-operating season, which greatly improves the management conditions of the unit, thereby prolonging the service life of the electric pump unit.