Why submersible sewage pump failure and how to solve
Causes and treatment methods of insufficient or no water flow in operation of submersible sewage pump
l The installation height of the submersible sewage pump is too high, so that the immersion depth of the impeller is not enough, resulting in the decrease of the water output of the water pump; the allowable deviation of the installation elevation of the water pump shall be controlled, which shall not be expanded at will.
l On the contrary, before the test run of the submersible sewage pump, the motor shall be idled, and the direction shall be checked to make it consistent with the submersible sewage pump; in case of the above-mentioned situation during the use, check whether the phase sequence of the power supply has changed.
l The outlet valve cannot be opened. Check the valve and maintain it frequently.
l The outlet pipe is not smooth or the impeller is blocked. Clean up the blockage of the pipeline and impeller, and often salvage the sundries in the reservoir.
l The wear ring at the lower end of the submersible sewage pump is seriously worn or blocked by sundries. Clean sundries or replace wear ring.
l Pumping liquid density is too high or viscosity is too high. Find out the reason of water quality change and control it.
l When several water pumps share the pipeline output, there is no one-way valve installed or the one-way valve is not tightly sealed. Install or replace one-way valve after checking the cause.
Main causes of motor overload or over temperature caused by over current of submersible pump
l The working voltage is too low or too high; check the power supply voltage and adjust the transmission voltage.
l There is friction between moving and static parts in the submersible sewage pump or between impeller and sealing ring; judge the position of friction parts and eliminate the fault.
l The motor power is inconsistent with the submersible sewage pump characteristics due to the low head and large flow; adjust the valve to reduce the flow to match the motor power with the pump.
l The pumping density is high or the viscosity is high; check the reason of water quality change and change the working conditions of the submersible sewage pump
l The bearing is damaged; replace the bearing at both ends of the motor
The main reason and treatment of the low insulation resistance of submersible sewgae pump
l When the power line is installed, the end is immersed in water or the power line and signal line are damaged, causing water inflow; replace the cable or signal line, and dry the motor.
l The mechanical seal is worn or not installed in place; replace the upper and lower mechanical seals and dry the motor.
l The O-ring is aged and ineffective; replace all sealing rings and dry the motor.
Reverse when submersible sewage pump stops
l When the submersible sewage pump motor is cut off, the pump will reverse. The main reason is that the check valve or flap valve in the outlet pipe is out of order.
l Before installation of the elimination measures, check shall be carried out, the installation direction of the check valve shall be correct, the center of the flap door shall be aligned, and the opening and closing shall be flexible. Check the check valve or flap valve frequently during operation, repair or replace the damaged part with a check valve or flap valve of guaranteed quality.
In the pipeline of submersible pump, there are often obvious water leakage at the joint of pipeline or flange and the causes and treatment methods
l The pipeline itself is defective and has not passed the pressure test;
l The gasket joint at the flange connection is not treated properly;
l Flange bolts are not tightened in a reasonable way; defective pipes shall be repaired or even replaced; if the center deviation of butt pipes is too large, they shall be removed and rearranged. After alignment, the connecting bolts shall be inserted and tightened in a basically free state. After all pipes are installed, the pressure strength and leakage test of the system shall be carried out. It must be replaced with a new one.
