Steps for emergency switching of a centrifugal pump

It depends on the circumstances in which the switch is made. If there is a leak and a fire breaks out, the power supply must be cut off promptly to prevent harm to people caused by electrical equipment leaks. Then start the backup pump to resume production.

Agree with what was said above. In the case of a material leak, if the backup pump is started first, the outlet pressure will rise rapidly, which in turn increases the leakage. In such a situation, the operating pump should be stopped first, and the leakage amount will decrease quickly.

If the leakage is not severe, start the backup pump first and then keep the operating pump running; this will prevent any fluctuations. If the leakage is heavy or a fire breaks out, stop the motor first. If there is an outlet valve that can be used, close it immediately; otherwise, shut off the upstream and downstream valves and then try to seal the leak or put out the fire in order to avoid causing further problems with the installation

Generally, standby pumps and reuse pumps are connected in parallel; if the standby pump is started directly, it will cause an increase in pipeline pressure.

The original poster’s question isn’t clear enough; it doesn’t specify which type of pump is meant, which is too general. In fact, each case needs to be analyzed on its own

I learned it! In every refinery, there are accident plans. Many things are lessons learned through bloodshed. I hope that everyone will memorize the emergency plans in their daily work, so as to minimize losses in the event of an accident.

Each issue should be analyzed on its own merits; in emergency situations, the approaches taken shouldn’t be rigid. Here, by reading what the experts have said, I’ve learned a lot

1. In the case of a regular switch-over, it is necessary to first start the backup pump, then shut down the existing pump before starting the backup one. (Additionally, when a stable flow rate is required for the process, a simultaneous switch-over is needed to prevent excessive fluctuations in flow rate.) 2. In the case of a failover due to an accident such as a fire or oil leakage, there is no need to follow strict procedures; instead, it is necessary to quickly cut off the power to the existing pump, close its inlet and outlet valves, and then start the backup pump； In the event that the situation escalates, parking arrangements need to be made. 3. If it is a minor fire and not an emergency situation, such as a small fire or a minor oil leak, conservative measures such as using steam to cover the fire should be taken before attempting to extinguish it, following the procedures outlined in point 1.

Leaking fire. The motor temperature is extremely high. In the case of other more serious failures, it is necessary to ensure the safety of the equipment first. Prevent more severe damage to the equipment.

Additionally, there is the safety of the personnel to consider.