Submersible sewage pump selection problem

Today I encountered a customer asking a selection question: the water depth is 5 meters, and the water needs to be pumped 1,000 meters away, and 

the pipe is 3 inches. What power submersible sewage pump should be used?

What if it were you, how would you choose?

First of all, the pipe diameter selected by the customer is 3 inches, which means that the diameter of the pump is 80. Next, we need to know what the 

specific working conditions of the sewage that the customer mainly discharges. If it is ordinary sewage and there is no too much impurity, an ordinary 

QW/WQ submersible sewage pump is enough. If it contains sediment, it is best to use JYWQ automatic discharging pump. The sewage pump itself has 

a stirring device, so that the sediment at the bottom will be stirred and discharged together, so that the sewage will be discharged, and there will be no 

troublesome operation. Another situation is that if the sewage contains long fibers or weeds and other debris, it is necessary to use the WQK/QG submersible

 sewage pump with cutting device, and the bottom of the pump is equipped with a cutting blade, so that the pump will not be blocked, greatly improving

 the service life and efficiency of the pump. Therefore, when the working conditions are uncertain, it is best to consult our Dingfei Pump Industry technician 

to help you select the model. You can also go to our website to see a detailed introduction to various submersible sewage pump products.

Secondly, you need to know whether the sewage is corrosive. If it is corrosive, you need to choose a stainless steel submersible sewage pump. Stainless steel 

includes materials such as 201, 304, 316, 316L, etc. It should be selected according to the specific usage conditions. This is also very critical. If the selection is 

incorrect, it is also very troublesome. I won’t go into details here. I will talk about it slowly later. If you have any questions, please contact us.

Third, it depends on whether the sewage is high, because the general temperature of an ordinary submersible sewage pump is below 40°C. If the temperature

 is too high, you need to re-select the model. For example, when the temperature is 100°C, you need to choose a 304 material or higher. Of course, this also depends 

on the specific situation. If you have any questions, please contact our Dingfei Pump Industry technician.

Fourth, generally, you need to know the head of the submersible sewage pump required by the customer. For example, if the customer has a water depth of five meters, 

we calculate it according to its five meters head. If the head is chosen, it must be at least greater than 5 meters. In theory, if the pipe is horizontal or downhill, then 

the head is not a big problem. If there are more curves and then uphill slightly, the head requirements will be higher. Of course, if you require the flow rate to reach 

1,000 meters away, this needs to be recalculated. We just need to analyze the specific situation. The specific situation needs to be analyzed in detail.

I hope that what I said will be helpful to the majority of customers. Of course, it is just personal opinion. Please forgive me if you say something wrong. Therefore, 

the selection of submersible sewage pumps is quite knowledgeable. If you choose the right one, the service life of the pump will be greatly increased. Of course, 

the maintenance of the pump is also indispensable. Therefore, if the customer is not sure what type of submersible sewage pump to use, it is best to consult our 

professional technicians of Shanghai Dingfei Pump Industry Co., Ltd. In the future, I will continue to share with you some knowledge about submersible sewage 

pump selection, maintenance, fault diagnosis, etc., so please pay attention.