Working conditions of centrifugal pump

According to the actual characteristic curve of pump, centrifugal pump is flat.

1. According to the empirical formula of allowable minimum flow of centrifugal pump, the minimum flow of general centrifugal pump is 0.25 times of design flow. For this centrifugal pump, it is about 12.5m? /h, the black interval is above the minimum flow rate of centrifugal pump, and the bearing will not be worn.

2. The efficiency of the high-efficiency area is not less than 92% of the highest efficiency.

The efficiency η of the black area on the map is 56.25% ~ 62.25%;

The maximum value on the η-Q curve on the diagram is equivalent to 70% of the highest efficiency, that is, the pump runs at the flow rate and head corresponding to this point, and its efficiency is the highest; This point is also called the best working point of centrifugal pump.

Then:

(56.25%~62.25%)÷70%=80.35%~88.92%