Centrifugal pumps are widely used in petrochemical, coal chemical industry, transport of different nature of the liquid, the pressure required to provide chemical reactions, flow. Various kinds of centrifugal pump, according to the medium properties can be divided into acid pump, pump, water pump, mud pump etc.. The working temperature and working pressure of the conveying medium are different, so the use period of the centrifugal pump can be prolonged, and the maintenance amount can be reduced, and the economic benefit of the plant can be greatly improved.
Because of the centrifugal pump start, pump outlet pipe has not water, so there is no pipeline resistance and lift resistance, after the pump start, the pump head is very low, the flow is very big, the pump motor (power output shaft) great (according to the pump performance curve), it is easy to overload, it may cause the motor and line pump damage, therefore starts to close the outlet valve of the pump to make normal operation.
