The pump starts and stops frequently; the coupling keeps breaking, and there is significant vibration
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There is a water pump, and a level controller is used to start and stop it automatically: the pump stops when the liquid level is low, and it starts again when the level is high. Frequent starting causes the coupling to get damaged frequently. Is there any way to solve this problem?
What type of coupling structure is it, and are there any issues with alignment?
Frequent start-stop cycles indicate that the tank is too small and the pump is too large
Add a small pump; it starts when the liquid level is high, while the large pump starts only when the liquid level is extremely high.
The dehydration pack in the separation tank is relatively small in size; the liquid level is controlled between 25% and 75%, with a rated flow rate of 4 m3/h. There are two pumps, one of which operates continuously while the other starts and stops automatically
The information you provided is incomplete. First, it’s necessary to determine what type of pump and coupling is being used; only then can the reasons for the issues be analyzed. Based on the flow rate you mentioned, it seems that the pump in question is quite small. How frequent are these vibrations, exactly? What is the volume of the dewatering tank? With such a low flow rate, vibrations shouldn’t be that severe. It’s likely that the pump selected is too large, resulting in deviations from normal operating conditions and thus abnormal vibrations. Also, it’s probable that you’re not using a diaphragm coupling – with such a low flow rate and load, a diaphragm coupling wouldn’t break so easily. If an elastic spline coupling is being used, it’s important to check whether the load is appropriate and whether the right size of coupling has been chosen.