Operation of high-flow centrifugal pumps
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Dear experts: When looking at a 6400 m3/h centrifugal pump, is it still necessary to close all the outlet valves before starting it?
Close the valve of the centrifugal pump, and open the valve of the axial flow pump
It is recommended to install a multi-functional water pump control valve at the outlet. It has slow opening, slow closing, and fast closing functions, which can reduce the motor load when the water pump starts, and prevent the occurrence of water hammer or minimize the damage caused by water hammer to the water transmission pipes.
The centrifugal pump’s outlet valve is closed; a circuit is provided in the design
It’s not the high-speed centrifugal pump that requires the outlet valve to be closed; otherwise, starting the pump can easily lead to overcurrent
It’s fine to leave it slightly ajar; it doesn’t have to be that strict. If it is in the closed state, after starting the pump, the pump pressure will make it difficult to open the outlet valve; I think leaving it slightly ajar is a better approach.
Could you tell me about the head, speed, and pump structure?
The large pump can be set to a slightly higher level of operation; it’s difficult to open the valve once the pump has started running due to the pressure. If the pump is set to a too high level, it can easily cause the motor current to exceed its limits, leading to damage to the motor. So it’s okay to leave it slightly open.
In principle, it should be shut down. Of course, for ease of operation, you can also leave it slightly open; there’s no big problem with that.
Closing the valve before starting a high-flow pump is a standard operating procedure. The purpose is to prevent the pump from operating at low head and high flow rate during startup, which could cause the motor to overload and disrupt the power grid. The power of a 6400-cubic-high-pressure motor is estimated to be over 740 kilowatts. A tripping of a high-voltage motor can be classified as a major fault. The theoretical shaft power is minimum when the valve is closed; this is the principle behind the operation of centrifugal pumps.