How should fire pumps be handled during surge phenomena?

What is meant by surge phenomenon? During a period of unstable operation, there is a cyclical phenomenon, in one cycle, in the next cycle, in the project there is a cyclical phenomenon, known as the surge phenomenon or flight phenomenon. Fire pumps in the surge phenomenon should be a combination of fluid flow in the pipeline and the driving force of the pump system.

When the surge occurs, the pump works around the point of work is still counterclockwise rotation. It can be seen that the rotating region or hump-shaped performance curve hump-shaped region of the working point curve, according to the relevant data show that the frequency range of 0.1 ~ 10, this frequency is equal to the system inherent frequency of the pump.

Rotational stall and shock vibration and air vibration is caused by the fluid flow vibration, can affect the safe operation of the pump.

Rotational stall is caused by the structure of the vane of the rotating flow, can cause blockage of the vane channel and the reduction of the pump head. Surge is the result of pump performance and coupled oscillating devices with the mechanical stability of the pump system.

Surge phenomenon is the pump system in the fluid flow process to produce anomalies, and industrial water hammer phenomenon, resulting in small economic losses, in the project often can not get extensive attention, but in the high-pressure pump operation, the vibration and noise generated by the noise is very strong, such as boiler feed pumps and so on. Therefore, it is necessary to protect against it, once it occurs, it must be changed to the normal operating state by changing immediately after the opening of the fire pump regulating valve.