The Difference Between Submersible Sewage Pumps And General Sewage Pumps

Apr 19, 2025

Submersible sewage pump is a type of pump product that is connected to a motor and operates underwater simultaneously. It is compared to conventional horizontal or vertical sewage pumps. Submersible sewage pumps have the following advantages:

1. It does not have problems such as cavitation damage or water injection. Especially the latter point has brought great convenience to the operators.

2. Low vibration noise, low temperature rise of the motor, and no pollution to the environment.

3. Compact structure and small footprint. Submersible sewage pumps work underwater. Therefore, it can be directly installed in the sewage tank without the need to build a dedicated pump room for installing pumps and machines, which can save a lot of land and infrastructure costs.

4. Easy installation and maintenance. Small submersible sewage pumps can be freely installed, while large submersible sewage pumps are generally equipped with automatic coupling devices for automatic installation, making installation and maintenance quite convenient.

5. Long continuous operation time. Submersible sewage pumps, due to their coaxial pump and motor, short shaft, and lightweight rotating components, bear relatively small radial loads on their bearings and have a much longer lifespan than regular pumps.

It is precisely because of the above advantages that submersible sewage pumps have received increasing attention from people. The scope of use is also becoming wider and wider, from simply transporting clean water to now being able to transport various types of domestic sewage, industrial wastewater, construction site drainage, liquid feed, and so on. It plays a very important role in various industries such as municipal engineering, industry, hospitals, construction, restaurants, and water conservancy construction.
But everything is divided into two parts, and the most critical issue for submersible sewage pumps is reliability.
Because the use of submersible sewage pumps is underwater; The medium being transported is a mixture of liquids containing solid materials; The pump is very close to the motor.
The pump is arranged vertically, and the weight of the rotating components is in the same direction as the water pressure borne by the impeller. These issues make the requirements for sealing, motor bearing capacity, bearing arrangement, and selection of submersible sewage pumps higher than those of general sewage pumps.