1. According to the layout of the device, terrain conditions, water level conditions, operating conditions, economic plan comparison and other factors

2. Consider selecting horizontal, vertical and other types (pipe type, right angle type, variable angle type, corner type, parallel type, vertical type, submersible type, removable type, submerged type, non clogging type, self-priming type, gear type, oil filled type, water filled type).

3. According to the nature of liquid medium, clean water pump, hot water pump, oil return pump, chemical pump, corrosion resistant pump or impurity pump shall be determined, or non clogging pump shall be adopted.

4. The water pump installed in the explosive area shall be explosion-proof motor according to the explosive area grade.

5. Vibration quantity is divided into pneumatic and electric (electric voltage is divided into 220v and 380v).

6. According to the flow, choose single suction pump or double suction pump: according to the lift, choose single suction pump or multi suction pump, high speed pump or low speed pump (air conditioning pump), and the efficiency of multi-stage pump is lower than that of single-stage pump. When both single-stage pump and multi-stage pump can be used, single-stage pump should be selected.

7. Determine the specific model of the water pump. After selecting the series of water pumps to be used, the specific model can be determined on the series characteristic curve according to the two main performance parameters, namely, the maximum flow and the head after enlarging the margin of 5% - 10%, or the most appropriate pump can be selected with the selection software (the following figure is the dimension selection software).

Use the pump characteristic curve to find the required flow value on the abscissa and the required lift value on the ordinate. From the two values, draw the vertical line or horizontal line upward and right respectively. The intersection point of the two lines just falls on the characteristic curve, then the pump is the pump to be selected. However, this ideal situation is not rare, and usually meets the following situations:

A. The first type: the intersection point is above the characteristic curve, which means that the flow meets the requirements, but the head is not enough. At this time, if the head difference is not much, or about 5%, it can still be selected. If the head difference is much, select the pump with larger head, or try to reduce the pipeline resistance loss (the following figure intercepts the semantic dimension selection software).

B. The second type: the intersection point is below the characteristic curve, within the fan trapezoid range of the pump characteristic curve, the model is preliminarily determined, and then whether to cut the impeller diameter is determined according to the difference of the head. If the difference of the head is small, the impeller diameter is not cut, if the difference of the head is large, the impeller diameter is cut according to the required Q, H, according to its ns and cutting formula, if the intersection point does not fall within the fan trapezoid range, The water pump with small lift shall be selected (the following figure intercepts the model selection software of Yiwei).

What are the characteristics of vertical stainless steel pipe sewage pump

The vertical stainless steel pipe sewage pump is developed by absorbing and transforming foreign advanced technology, and its performance indicators have reached the national standard level of similar products. Due to the unique single (double) channel impeller, it has strong sewage discharge capacity and can effectively pass through 5 times the fiber of the pump diameter and solid particles with a diameter of 50% of the pump diameter. The dynamic seal adopts two groups of cemented carbide mechanical seals made of special materials, which are made of cast iron and stainless steel.

What are the characteristics of vertical stainless steel pipe sewage pump?

LW vertical sewage pump is applicable to the discharge of seriously polluted industrial and commercial wastewater, sewage discharge station in the main residential area, water distribution system of urban sewage treatment plant, drainage station of civil air defense system, water supply equipment of waterworks, sewage discharge of hospitals and hotels, municipal engineering construction sites, mine supporting accessories, rural biogas digesters, farmland irrigation and other industries. It can also be used to transport granular sewage and sewage, as well as clean water and weakly corrosive media.