Selection Summary of Farmland Irrigation Pumps

The selection of water pump should be analyzed according to specific circumstances, mainly considering the water pump flow and water pump head.

First of all, we should start with the following four principles:

1. The selection of water pump should meet the requirements of flow rate and head;

2. During long-term operation of the water pump unit, the efficiency of the water pump working point is the highest;

3. The selection of water pumps should be based on the selected water pump model and number. The water pump station should be designed with the minimum investment in equipment and civil engineering;

4. The water pump should be selected for easy operation and maintenance, with low management costs.

(1) The selection of Sunmoypump water pump should determine the flow rate:

Flow rate = (total water demand of farmland + water loss in channel) / working time of water pump. It is difficult to generalize the total water demand of farmland. It needs to be determined according to the actual situation and farmers' experience. The total water demand of farmland is equal to the product of farmland area and irrigation depth. Water flows through the channel, and the water loss of the channel is also related to many factors. The selection of water pump generally loses 5%-25% of the water demand of farmland. The working time of water pump can be determined according to actual needs.

(2) The selection of water pump should determine the head:

The actual head can be measured on site, that is, the vertical height from the water surface of the water source to the water surface of the channel or farmland. If it is a river or lake, the water surface of the water source should be based on the low water level during drought resistance. When selecting a water pump, the installation height of the water pump should also be considered when determining the head. The maximum installation height of the water pump = the allowable suction height of the water pump - the suction loss head of the water pump. Generally, for a small-caliber water pump (less than 8 inches) and a not too long suction pipe, according to experience, the suction loss head is about 2 meters when there is a bottom valve, and the suction loss head is close to 1 meter when there is no bottom valve.

(3) Selection of water pump:

After determining the flow rate and head, you can compare the performance of the pump from the aspects of supporting power, efficiency, transmission mode and economic conditions to determine the appropriate type and model of the pump.

(4) Sunmoypump water pump selection type:

Centrifugal pumps have a small flow rate and a high head, and are suitable for actual heads above 10 meters; axial flow pumps have a large flow rate and a low head, and are suitable for actual heads below 4 meters; mixed flow pumps are between centrifugal pumps and axial flow pumps, and are suitable for heads of 5 to 10 meters.

(5) Water pump model selection:

The selected flow rate and head of the water pump should be basically consistent with the aforementioned determined flow rate and determined head, and should have the highest efficiency and the lowest shaft power.