The advantages, disadvantages and differences of self-priming pumps and submersible pumps

Nov 04, 2020

Most customers only know submersible pumps but don’t know what self-priming pumps are, and they don’t know what the difference is between self-priming pumps and submersible pumps. We all know that submersible pumps work in water, while self-priming pumps are It is installed on the ground and sucks the low water into the pump body and then is thrown out of the pump body by the impeller and transported to higher and farther places.

The following describes the differences between self-priming pumps and submersible pumps for reference:

First: the advantages of self-priming pumps and the defects of self-priming pumps

1. Advantages of self-priming pump: The main part is located above the water surface, which is easy to maintain. The load distribution is more uniform, and the mechanical load per unit area is small. The lifting height is small, and the pump room is low, so there is no need to move the power machine when disassembling. Water-lubricated bearings are few and can be used. The total cost of self-priming pumps, transmission equipment and power machines is relatively cheap.

2. Defects of the self-priming pump: the equipment area is large and the machine room area is large. The first time it is required to start with water filling, the operation is messy and inconvenient for automation. The sealing requirements of the water inlet pipe are relatively severe and air cannot be sucked into the pump body. The radial load requires high reliability of the bearing. When the water level of the inlet tank is high, the motor needs protection. If the water level of the inlet tank is too low and exceeds the useful suction range of the self-priming pump, the water cannot be sucked.

Second: The advantages of submersible pumps and the shortcomings of submersible pumps

1. The advantages of submersible pumps: the area of submersible pumps is small, the impeller is located underwater, and the function of absorbing people is better. Therefore, higher speed can be selected, no need to fill water to start, which is convenient for automation. The submersible pump with small size and light weight can also be easily moved and carried.

2. The main part of the defects of submersible pumps is below the water surface, which is inconvenient for maintenance. The crane has high lifting height, the pump room is high, the mechanical load is concentrated, the load per unit area is large, and the maintenance of water lubricated bearings is troublesome. The often moving submersible pump cables are simply damaged, and the cables need to be specially protected from being pulled during the moving process.

The above is that both self-priming pumps and submersible pumps have their own advantages and disadvantages. Customers can refer to the differences between self-priming pumps and submersible pumps according to their own practical conditions to choose a pump product that suits their own use. method.

Hope the above points could help you choose suitable dewatering pump for your own working condition. For more pumps introduction and purchase, such as Oil Pump, Chemical Pump, Screw Pump, Diesel Water Pump or Pneumatic Diaphragm Pump, could also find our Yonjou Pump.