In the event of an accident with a centrifugal pump
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In the event of an accident with the centrifugal pump or an issue with the pump’s outlet pipeline, can the motor be stopped directly without closing the outlet valve?
It should be possible. Generally, export connections are equipped with check valves to ensure that the material does not flow in the reverse direction; this is mainly to prevent the pump from rotating in the opposite direction
If the pump outlet is at low pressure, it should work; if the outlet is at high pressure, it definitely won’t work.
Yes, centrifugal pumps generally have check valves at their outlet, and the working principle of centrifugal pumps means that the pressure at their outlet is not very high.
It depends on the situation; if the pressure in the tower vessel at the outlet of the centrifugal pump is very high, it can easily lead to backflow of the process medium.
Sure, there’s no problem. Check valves are installed at the pump outlets, so the liquid won’t flow back. Additionally, modern pump impeller shafts are generally equipped with self-locking nuts, so the impellers cannot be easily removed!
Regarding this emergency situation mentioned by the poster, I believe the power supply should be cut off immediately before shutting off the outlet valve. In an accident situation, there is not enough time to first close the outlet valve before shutting down the pump, which can easily lead to the accident expanding and worsening.
Sure, it’s the only way to do it. Pumps generally have control valves at their outlet, which can be closed remotely; at the very least, there is a check valve at the pump outlet.
The problem should not be serious, as most outlet valves are one-way valves; if the pressure of the medium is high, it’s best to close the outlet valve first
Under normal circumstances, a check valve is installed at the pump outlet; in an emergency, it is possible to stop the pump and then close the valve. But some pumps may not be suitable for this purpose; the outlet of some pumps might be connected to equipment, and such equipment must not experience negative pressure. When the pump stops operating, if the check valve is damaged or missing, liquid will flow back, causing damage to the equipment. It is best to determine the operational requirements in emergency situations based on one’s actual circumstances, and train the relevant personnel accordingly.
The problem shouldn’t be that serious. . .