The following are the precautions for using a stainless steel submersible pump:
1. Preparations before use
(1) Check for any cracks or breaks in the cable. Before use, observe the appearance of the cable and use a multimeter or ohmmeter to check if the cable is conducting electricity. There should be no oil leakage at the cable outlet.
(2) Before using a new stainless steel submersible pump or a standby pump that has been stored for a long time, measure the insulation between the stator and the casing with an ohmmeter. If it is below 1 MQ, the motor winding needs to be dried to improve the insulation level. The insulation resistance value of the stainless steel submersible pump at cold state measurement is generally over 50 Mr2 when it is出厂.
(3) Check for oil leakage in the stainless steel submersible pump. Possible oil leakage points of the stainless steel submersible pump include the cable connection point, the sealing screw of the sealing chamber, and the O-ring seal. Determine if there is actual oil leakage. The reason for oil leakage at the screw connection point is that the screw is not tightened or the oil-resistant rubber gasket under the screw is damaged. If it is determined that the O-ring seal point is leaking oil, it is usually because the O-ring seal fails. At this time, the pump needs to be disassembled and the seal ring replaced.
(4) Before reusing a stainless steel submersible pump that has been out of service for a long time, the uppermost pump casing should be disassembled, the impeller should be rotated, and then the pump should be started to prevent the components from rusting and failing to start without water, which could damage the motor winding. This is particularly important for water-filled submersible pumps.
2. Precautions for the operation of stainless steel submersible pumps
(1) When conducting a trial run of a stainless steel submersible pump without water, the running time must not exceed the rated time. The volume of the water intake tank should be sufficient to ensure that the water level is high when the submersible pump is turned on and during operation, to ensure the cooling effect of the motor and avoid frequent starting and stopping due to large fluctuations in water level. Frequent starting of large and medium-sized submersible pumps has a significant impact on the performance of the pump.
(2) When the humidity sensor or temperature sensor gives an alarm, or when abnormal vibration or noise occurs during the pump operation, or when the output water volume or pressure decreases, and the power consumption significantly increases, the submersible pump should be immediately shut down for maintenance.
(3) Some submersible pumps with poor sealing will gradually have a decreasing insulation value even if they are not in use, and eventually become unusable, or even have an insulation failure phenomenon within a shorter time than the continuous operation of the submersible pump in water. Therefore, having a submersible pump on standby in the water intake tank sometimes does not serve as a backup function. If conditions permit, it can be kept in a dry standby outside the tank. When a certain submersible pump in operation fails, immediately stop the machine, lift it up, and then put the standby pump back down.
(4) Submersible pumps should not be started and stopped too frequently, otherwise it will affect the service life of the pump. When the pump stops, water in the pipeline will flow back. At this time, immediately starting the pump will cause the load to be too heavy during the pump startup and bear unnecessary impact loads; in addition, frequent starting and stopping of the submersible pump will damage components with poor shock resistance and cause damage to the entire pump.
(5) Before the motor completely stops running, it is not allowed to restart.
(6) When inspecting the submersible pump, the power supply must be cut off.
(7) When the submersible pump is operating, do not wash items nearby, swim, or release livestock into the water to avoid electric leakage of the submersible pump and electric shock accidents.
