What are the reasons for the overload of stainless steel submersible pumps

1. The power supply voltage is too low

Submersible pumps operate in rural areas where the voltage is much lower than the rated voltage, and the current in the stator winding increases more, which causes the stator winding to increase in temperature and burn out due to overheating.

2. Improper selection of pump

The actual load conditions used do not match the form of the selected submersible pump; the head of the selected submersible pump is too high or too low.

3. Mechanical failure

The bearings of the stainless steel submersible pump are seriously damaged, the stator and the rotor are rubbed "sweeping" or the impeller of the pump is stuck by other sundries such as water weeds and other mechanical failures will cause the stator winding of the submersible sewage pump to burn out.

4. Quality factors in manufacturer or repair

The quality of the stainless steel submersible pump manufacturer and repair caused the submersible pump to overload.

1. The installation height of the stainless steel submersible pump is too high, which makes the impeller immersion depth insufficient, resulting in a decrease in the water output of the pump; control the allowable deviation of the installation elevation of the pump, and cannot be expanded at will.

2. The direction of the water pump is reversed. Before the test operation of the water pump, the motor should be idling, and the steering should be checked 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 maintain the valve frequently.

4. The outlet pipe is not unblocked or the impeller is blocked. Clean up the blockages of pipelines and impellers, and often salvage the debris in the reservoir.

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

6. The density or viscosity of the pumped liquid is too high. Find the reasons for changes in water quality and manage them.

7. The impeller falls off or is damaged. Reinforce or replace the impeller.

8. When multiple water pumps share pipeline output, no one-way valve is installed or the one-way valve is not tightly sealed. Install or replace the one-way valve after checking the cause.

The operation of stainless steel submersible pump has abnormal vibration and instability, the main reasons are:

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

2. There is no independent support for the outlet pipeline, and the vibration of the pipeline affects the water pump; an independent and stable support is provided for the outlet pipeline of the water pump to prevent the outlet pipe flange of the water pump from bearing the weight.

3. The impeller is unbalanced in quality or even damaged 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.

The main reasons for the excessive current caused by the stainless steel submersible pump motor overload or over temperature:

1. The working voltage is too low or too high; check the power supply voltage and adjust the output voltage.

2. There are friction between moving and static parts inside the pump or friction between the impeller and the sealing ring; judge the position of the friction part and eliminate the fault.

3. Low head and large flow cause the power of the motor to be inconsistent with the characteristics of the pump; adjust the valve to reduce the flow so that the power of the motor matches the pump.

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

5. The bearings are damaged; replace the bearings at both ends of the motor.

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

1. When the power cord is installed, the end is immersed in water or the power cord or signal line is damaged, causing water to enter; replace the cable or signal line, and dry the motor.

2. The mechanical seal is worn or not installed in place; replace the upper and lower mechanical seals and dry the motor.

3. The O-ring is aging and out of function; replace all sealing rings and dry the motor.

In the stainless steel submersible pump pipeline, there are often obvious reasons for water leakage at the pipe or flange connection and the treatment method:

1. The pipeline itself is defective and has not undergone pressure test;

2. The gasket joint at the flange connection has not been properly processed;

3. Flange bolts are not tightened in a reasonable way; defective pipes should be repaired or even replaced. If the center of the butt pipe deviates too much, it should be removed and rearranged. After alignment, the connecting bolts should be inserted and tightened in a basically free state. , After all the pipelines are installed, the pressure strength and leakage test of the system should be carried out. It must be replaced with a new one.

Internal leakage of stainless steel submersible pump:

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

The main reason: damage to the dynamic seal (mechanical seal) or static seal (special seal for cable inlet, O-ring seal) of the submersible pump causes water seepage, and damage to the power cable or signal cable causes water seepage. Various alarm signals such as water immersion, leakage, humidity, etc. alarm and stop; before installation, check the quality of each sealing part; ensure that the end faces of each sealing part are in good contact during installation; check the phase-to-phase and ground insulation resistance of the motor and each alarm before operation Whether the sensing components of the system are intact. When the above failure occurs during operation, replace all damaged seals and cables and dry the motor. The disassembled seals and cables must not be used again.

The stainless steel submersible pump reverses when it stops:

1. After the water pump motor is powered off, the water pump will reverse. The main reason is that the check valve in the outlet pipe or the flapping door fails.

2. Exclusion measures should be checked before installation, the installation direction of the check valve should be correct, the center of the shutter should be aligned, and the opening and closing should be flexible. Check the check valve or flap door frequently during operation, repair the damaged part or replace the check valve or flap door with guaranteed quality.

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