How To Solve Problems With Stainless Steel Submersible Pumps

Jan 05, 2026

Stainless steel submersible pump is a type of submersible pump, because many submersible pumps are made of cast iron or plastic materials. If only these materials are used to make submersible pumps, it is difficult to meet customer needs. If there are many corrosive media, such as sulfuric acid, hydrochloric acid, nitric acid, etc., they cannot be discharged; This is one of its characteristics. Another characteristic is that in addition to not rusting, it is also resistant to high temperatures. So many manufacturers have also produced high-temperature resistant stainless steel submersible pumps. Although it is stainless steel, there are many auxiliary materials that cannot withstand high temperatures. Generally, it is not a problem within 120 ° C. For example, some chemical plants need to use centrifugal pumps that can withstand high temperatures of over 200 ° C.

 

Several common issues with stainless steel submersible pumps

1, Reasons and solutions for insufficient flow or failure to produce water during the operation of stainless steel submersible pumps:

1. The installation height of the stainless steel submersible pump is too high, resulting in insufficient immersion depth of the impeller and a decrease in the water output of the pump; The allowable deviation of the installation elevation of the water pump should not be arbitrarily expanded.

2. The water pump rotates in the opposite direction. Before the water pump is put into trial operation, idle the motor and check the direction to make it consistent with the water pump; If the above situation occurs during use, check whether the phase sequence of the power supply has changed.

3. The outlet valve cannot be opened. Check the valve and regularly maintain it.

4. The water outlet pipeline is not unobstructed or the impeller is blocked. Clean up blockages in pipelines and impellers, and frequently remove debris from the reservoir.

5. The wear-resistant ring at the lower end of the water pump is severely worn or blocked by debris. Clean up debris or replace wear-resistant rings.

 

 

6. The density or viscosity of the liquid being pumped is too high. Identify the causes of changes in water quality and take measures to address them.

7. The impeller is detached or damaged. Reinforce or replace the impeller.

8. When multiple water pumps share the same pipeline output, there is no one-way valve installed or the one-way valve seal is not tight. Install or replace one-way valves after checking the cause.

 

2, The stainless steel submersible pump has abnormal vibration and instability during operation, mainly due to:

1. The anchor bolts of the water pump base are not tightened or loose; Tighten all foundation bolts evenly

2. The outlet pipeline is not independently supported, and pipeline vibration affects the water pump; Provide independent and stable support for the outlet pipe of the water pump to prevent the flange of the outlet pipe from bearing weight.

3. Unbalanced or even damaged impeller quality or loose installation; Repair or replace the impeller

4. The upper and lower bearings of the water pump are damaged; Replace the upper and lower bearings of the water pump.

 

3, The main reasons for excessive current or motor overload or overheating caused by stainless steel submersible pumps are:

1. Low or high working voltage; Check the power supply voltage and adjust the input voltage.

2. There is friction between moving and stationary parts inside the water pump or between the impeller and the sealing ring; Determine the position of friction components and eliminate faults.

3. Low head and high flow rate result in a mismatch between the power of the electric motor and the characteristics of the water pump; Adjust the valve to reduce the flow rate and match the motor power with the water pump.

4. The pumping density is high or the viscosity is high; Check the reasons for water quality changes and change the working conditions of the water pump

5. Bearing damage; Replace the bearings at both ends of the motor

 

4, The main reasons and treatment methods for the low insulation resistance of stainless steel submersible pumps are:

1. During the installation of the power cord, if the end is submerged in water or if the power or signal lines are damaged, water may enter; Replace the cable or signal line, and dry the motor.

 

 

2. Mechanical seal is worn or not installed properly; Replace the upper and lower mechanical seals, and dry the motor.

3. O-ring aging and loss of function; Replace all sealing rings and dry the motor.

 

5, In the stainless steel submersible pump pipeline, there are often obvious water leakage phenomena at the pipeline or flange connection.

 

Reasons and treatment methods:
1. The pipeline itself has defects and has not undergone pressure testing;

2. The gasket joint at the flange connection is not properly handled;

3. The flange bolts were not tightened in a reasonable manner; Defective pipes should be repaired or even replaced. If the center deviation of the docking pipe is too large, it should be dismantled and rearranged. After alignment, the connecting bolts should be inserted and tightened in a basic free state. After all the pipelines are installed, the system's pressure resistance and leakage tests should be carried out. It must be replaced with a new one.

 

6, Internal leakage of stainless steel submersible pump:

When the submersible pump leaks, it causes insulation damage, bearing immersion, and alarm system alarm, forcing the unit to stop running.

The main reason is that the dynamic seal (mechanical seal) or static seal (cable inlet special seal, O-ring seal) of the submersible pump is damaged, causing water seepage, and the power cable or signal cable is damaged, causing water seepage. Various alarm signals such as immersion, leakage, humidity, etc. alarm shutdown; Before installation, the quality of each sealing component should be checked; During installation, it is necessary to ensure good contact between the end faces of each sealing component; Before operation, check the phase to phase and grounding insulation resistance of the motor, as well as whether the sensing components of each alarm system are intact. When the above-mentioned faults occur during operation, replace all damaged seals and cables and dry the motor. The dismantled seals and cables shall not be reused.

 

7, Reverse when stainless steel submersible pump stops:

1. After the power failure of the water pump motor, the water pump will reverse, mainly due to the malfunction of the check valve or flap in the outlet pipeline.

 

 

2. Before installing the exclusion measures, a check should be carried out to ensure that the installation direction of the check valve is correct, the center of the valve is aligned, and the opening and closing should be flexible and free. Regularly check the check valve or flap during operation, repair or replace damaged parts with quality assured check valves or flaps.