Working point and precautions of the centrifugal pump

Compared with other types of pumps, the centrifugal pump has many advantages, such as concurrent flow, stable running, low vibration, high speed, low installation and maintenance costs, and a wide range of applications. Therefore, the centrifugal pump is a kind of chemical pump which is widely used in chemical production. Next, let's take a look at the working point and precautions of the centrifugal pump.

Here is the content list:

• The working point of the Centrifugal pump.

• What should I pay attention to when buying a centrifugal pump?

The working point of the Centrifugal pump.

The characteristic wind of the centrifugal pump is the essential specification of the pump which has nothing to do with external use still, once the pump is arranged to work in a certain channel system, the factual working condition isn't only related to the characteristics of the centrifugal pump itself but also depends on the working characteristics of the channel. Thus, to elect and use the centrifugal pump well, it's necessary to take into account the characteristics of the channel at the same time.

When transporting liquid in a specific channel, the required head He of the channel changes with the forecourt of the inflow rate Qe. Drawing the relation on the coordinate paper is the corresponding pipe characteristic curve. However, the crossroad point M of the two lines is called the working point of the pump, If the characteristic angles of the centrifugal pump and the channel characteristic angles of the centrifugal pump are drawn on the same match paper. When opting for the pump, the corresponding inflow and head of the operating point can't only meet the conditions of the pipeline system but also be handed by the centrifugal pump, videlicet, Q = Qe, H = He.

What should I pay attention to when buying a centrifugal pump?

1. Select the type and model of centrifugal pump: first, the type of centrifugal pump should be determined according to the nature and operating conditions of the liquid to be transported, and then the appropriate flow rate Q and head H should be selected from the sample or product catalog of centrifugal pump model. The flow rate and pressure head provided by the selected centrifugal pump may not exactly match the flow rate Q and pressure head H required by the pipeline, and there is some margin considering the change of operating conditions, the flow rate, and the pressure head of the selected centrifugal pump. The head can be slightly larger, but under this condition, the efficiency of the centrifugal pump should be relatively high, that is, the coordinate position of the point (Q, H) should be below the H-Q curve corresponding to the high-efficiency range of the centrifugal pump.

2. Determine the flow rate and pressure head of the conveying system: The conveying amount of the liquid is generally specified by the production task. If the flow rate fluctuates within the characteristic range, the large flow rate should be considered when selecting a centrifugal pump. According to the arrangement of the pipeline of the conveying system, calculate the pressure head required for the pipeline under large flow.

3. Determine the type according to the nature and operating conditions of the liquid to be transported, and determine the type of centrifugal pump according to the flow rate and the pressure head required in the calculation pipeline. If the viscosity and density of the liquid to be transported are quite different from those of water, the centrifugal pump should be calculated. The characteristic parameters of the pump: are flow, head, and shaft power.

4. There may be several types of centrifugal pumps that meet the requirement of operating within a good range at the same time. The working point of each centrifugal pump can be determined separately, the efficiency at the working point can be compared, and the best one can be selected. In addition, the production of centrifugal pumps should also be considered. The technical level and quality problems of the manufacturers should be combined with their actual needs. Pay attention to these points to find a satisfactory device.

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