Regarding the start-up and shutdown of centrifugal pumps with a sealed impeller
Thread Content
If the pump outlet pipe is 4 to 5 meters long and considered to be filled with liquid, is it still necessary to start the pump using the priming method? For some processes that operate intermittently, the pump may need to be started and stopped several times a day; in such cases, it is necessary to install automatic valves to enable start-up and shutdown of the pump without manual intervention. Is it also necessary to use such valves for stopping the pump?
If the pump outlet pipe, which is 4 to 5 meters long, is filled with liquid, then the pump does not need to be started under vacuum. Install automatic valves to enable the start of the dead-end pump; it is still necessary to stop the dead-end pump.
It's necessary! Installing automatic valves is quite convenient to operate!
Start the pump after installing the automatic control valve, close the control valve, and open it again once the outlet pressure reaches the closing pressure. Before stopping the pump, close the control valve first, then stop the pump, which reduces the number of times the outlet manual valve needs to be opened and closed, making the operation simpler. It is only applicable to ordinary centrifugal pumps; for high-speed pumps or those with higher power, it is necessary to proceed slowly in accordance with the operating procedures.
This is necessary; it is a strict set of operating procedures
This is definitely necessary; installing an automatic control valve is certainly more convenient than using a manual one
I don’t understand what is meant by starting a pump under vacuum Has the positive displacement pump stopped?
According to the operating procedures, this is necessary