Can an submersible centrifugal pump fail to trip in the event of a power loss?
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Power loss means the pump stops. By \"no tripping,\" it means that the pump can be restarted without the need for power supply from the electrical distribution room. Is it possible for this to happen?
One needs to check the control circuit of the pump; usually, a power loss causes an automatic shutdown, otherwise the pump will get damaged
It depends on your design philosophy. If your design requires that, after power is restored, it must be confirmed (or reset) either on the DCS or at the site before automatic startup is possible, then it cannot start automatically after a power loss. In ordinary factories, confirmation is at least carried out on the DCS. And if your design requires that no confirmation in the DCS is needed after power is restored, and the start/stop of the pump is linked to the liquid level – for example, the pump starts automatically when the liquid level is high.
Maybe I didn’t explain it clearly. Here’s what happened: while the pump was in operation, it stopped automatically (it is suspected that there was wear and tear, which led to an increase in power consumption and a tripping of the system). Later, without contacting the electrical department to restore power, the local power supply was used directly, and the pump was able to start working normally.
It didn’t trip even when the shaft broke – is it because the protection settings are too high or due to some other electrical issue? This needs to be investigated thoroughly! Prevent similar problems from occurring again in the future!
At our factory, the power grid sometimes experiences sudden voltage drops; as a result, some pumps stop operating while others continue to function.