Does The Submersible Sewage Pump Not Produce Water? What Are The Reasons?

Dec 20, 2025

Submersible sewage pumps have received increasing attention and are being used in a wider range of applications, from simply transporting clean water to now being able to transport various types of domestic sewage, industrial wastewater, construction site drainage, liquid feed, and more.
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 key issue for sewage submersible pumps is reliability, because the use of sewage submersible 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 sewage submersible pumps higher than those of general sewage pumps.

In order to improve the service life of sewage submersible pumps, most manufacturers are now trying to find ways in the pump protection system, that is, automatic alarm and automatic shutdown for maintenance in case of pump leakage, overload, overheating and other faults. But we believe that it is necessary to install a protection system in sewage submersible pumps, which can effectively protect the safe operation of the electric pump.
But this is not the key issue, the protection system is just a remedial measure after a pump failure, which is a relatively passive approach. The key to the problem should be to start from the root and solve the problems of sealing and overload in the pump, which is a more proactive approach for sewage submersible pumps. To this end, we have applied the hydrodynamic sealing technology of the secondary impeller and the overload free design technology of the pump to the sewage submersible pump, greatly improving the reliability and load-bearing capacity of the pump seal and extending the service life of the pump.

1. The reason why the submersible pump cannot rotate may be that the liquid being transported is corrosive. Ordinary cast iron sewage pumps are easily corroded, and the impeller nuts become loose after corrosion, causing the impeller to come into contact with the submersible pump body and resulting in the submersible pump not rotating. It is recommended to use stainless steel submersible pump products made of stainless steel material.
2. The reason why the submersible pump cannot rotate may also be due to the use of an automatic mixing sewage pump with mixing function. It is very likely that fibers or other debris contained in the conveyed liquid are wrapped around the impeller or blocked inside the pump body, causing the submersible pump to not rotate.

 

 

3. The reason why the submersible pump cannot rotate may also be due to the damage of the submersible pump's bearings, causing the submersible pump to get stuck and the water pump control cabinet to trip as soon as it is started. In this case, a new bearing should be replaced.
4. After replacing the new bearings, there is still a phenomenon of the submersible pump not rotating. The reason for the submersible pump not rotating may also be a problem with the motor rotor of the submersible pump. Due to the slightly thicker diameter of the motor rotor, it is difficult for the submersible pump motor to rotate. This situation can only be solved by replacing the new motor rotor or removing the old motor rotor and turning it on a lathe for about 30 microns.