An agricultural water pump is a type of power machinery specially used for agricultural irrigation, drainage, and water lifting operations. It is driven by electricity, a diesel engine, or other power sources, and pumps water from lower areas to higher areas to meet the water needs of farmland.
Agricultural water pumps are characterized by strong adaptability, easy operation, and a wide variety of types. They can meet the needs of different terrains, water sources, and irrigation requirements, making them key equipment in modern agricultural production. However, some problems may also occur during use, such as the agricultural water pump failing to draw water.
Reasons Why Agricultural water pumps Cannot Pump Water
It is a common fault that Agricultural water pumps fail to draw water. The fundamental reason is usually that negative pressure is not formed inside the pump or the water flow channel is obstructed. The specific causes can be summarized into the following categories:
I. Air in the Pump Body and Pipelines
This is one of the common causes. Before starting an agricultural water pump, if the pump body or suction pipe is not filled with water, any remaining air can prevent the impeller from creating negative pressure, resulting in failed water suction. Additionally, improper installation of the suction pipeline (such as a horizontal section not slightly inclined toward the pump), poor sealing at pipe connections, worn or overly loose packing, or holes in the suction pipe due to corrosion can all lead to air entering the pipeline system, disrupting the vacuum. For self-priming pumps, the pump chamber must be filled with priming water before starting.
II. Suction height exceeds the allowable range of Agricultural water pumps
Each Agricultural water pump has its maximum allowable suction lift. If the vertical distance from the water source surface to the pump inlet (actual suction lift) exceeds this limit, even if there is no air in the pump, atmospheric pressure cannot push the water into the pump. When installing the pump, this physical limitation must be considered. If necessary, the installation height of the Agricultural water pump should be lowered or a pump with a greater suction lift should be used.
III. Clogging in the inlet pipeline or Agricultural water pumps
The inlet screen or foot valve may be blocked by weeds, silt, or other foreign matter, or scaling and sediment accumulation may occur inside the impeller channels or pipes, all of which can lead to poor water flow, insufficient flow, or even complete flow stoppage. Corrosion in the pipeline of every 100 meters can significantly increase friction loss, and scaling with a thickness of 1 millimeter can reduce flow by up to 23%. Regular cleaning of the screen, pipeline, and impeller is a necessary maintenance measure.
IV. Mechanical Component Failures of Agricultural Water Pumps
The impeller of an agricultural water pump is the core working component. Long-term use can lead to wear, deformation, or damage, which directly results in decreased pumping efficiency or even failure. Mechanical failures such as a bent pump shaft, damaged bearings, or loose impeller fastening nuts can cause friction between the impeller and the pump casing, reducing rotation speed and efficiency. Aging or damaged sealing components (such as mechanical seals or packing) can cause water or air leakage inside the pump, affecting vacuum formation.
V. Power System Issues
Motor failure is an important reason why agricultural water pumps cannot start or run weakly. Power supply problems, such as unstable voltage, phase loss (the power of a three-phase motor can drop by 57% when running with a missing phase), and wiring errors causing the motor to run in reverse, can all affect the normal operation of agricultural water pumps. In addition, replacing the motor with an incompatible one at will can cause motor overload and insufficient speed, thereby affecting water pumping. For belt-driven agricultural water pumps, belt slippage and wear can also lead to reduced speed.
VI. Other Factors
Valve Malfunction: If the foot valve is rusted, does not close properly, or the filter screen is clogged, it can cause insufficient water intake or water leakage during pumping.
Excessive Pipeline Resistance: If the outlet pipeline of the agricultural water pump is too long, has too many bends (especially 90° right-angle bends), or the pipe diameter is too small, it will significantly increase hydraulic loss. Even if the head is sufficient, it may still fail to pump water or deliver a reduced flow.
Water Source Issues: If the water level of the source is too low, below the inlet of the agricultural water pump, it cannot generate enough suction.
Improper Selection: If the rated head of the agricultural water pump is much higher than the actual required head, the operating point may deviate from the efficient zone, which may also result in difficulty pumping water.
When troubleshooting, it is recommended to follow the sequence from simple to complex and from external to internal: first check the power supply, water charging, air venting, and the sealing of the inlet pipeline; next, check whether the agricultural water pump’s filter screen and foot valve are clogged; then check the motor rotation direction, speed, and belt tension; and finally consider disassembling the pump to inspect internal mechanical components such as the impeller and seals.
VII. Q&A on Knowledge Related to Agricultural Water Pumps
1. How to solve the 'air binding' problem in Agricultural Water Pumps?
Before starting, fill the pump body and inlet pipe with water to expel air, and check whether the seals are aged and the joints are tightened.
2. What should be paid attention to when stopping an agricultural water pump?
First, close the outlet valve, then cut off the power to prevent water hammer impact; if not used for a long time, drain the water in the pump to prevent freezing and rust.
3. What parameters should be considered when purchasing an Agricultural Water Pump?
Determine the required head, flow rate, and power supply type (single/three phase), match the power, and choose products with a certificate of conformity and warranty.
VIII. Application Areas of Agricultural Water Pumps
Farmland Irrigation: Drawing water from rivers, wells, or ponds and transporting it to fields through hoses or pipelines to meet the water needs of crops such as wheat, corn, and rice.
Drought Emergency: In drought seasons or areas with scarce water sources, agricultural water pumps quickly extract groundwater or transfer water over long distances to ensure the survival and harvest of crops.
Drainage and Flood Prevention: During the rainy season, agricultural water pumps are used to remove accumulated water from farmland, preventing root rot of crops, especially suitable for low-lying and flood-prone areas.
Aquaculture: Agricultural water pumps provide water replacement, oxygenation, and circulation system support for fish ponds, shrimp ponds, and other aquaculture setups, maintaining water quality.
Well Water Extraction: Using submersible pumps for wells (such as QJ type) to draw water from deep wells for human and animal drinking or irrigation purposes.
Mountain Water Supplement: Working with self-priming pumps or mixed-flow pumps to achieve multi-stage water lifting, solving the problem of insufficient irrigation water in mountainous areas.
Construction Site Dewatering: In construction, agricultural water pumps are used for dewatering foundation pits, keeping the work surface dry and safe.
Agricultural water pumps are widely used in farmland irrigation, drought relief and flood drainage, aquaculture, well water extraction, and construction site dewatering. They are key equipment in agricultural production and emergency operations. Users should select the appropriate model of agricultural water pump according to specific work requirements.
More information about Agricultural water pump: http://www.wf-fadianji.com/
Sales hotline: +86 15905360672
WeChat customer service: +86 15905360672
Email address: huaquan@huaquanpower.com
Official website: https://www.huaquanpower.com
Production Base: No. 11666 Guting Street, Economic Development Zone, Weifang City, Shandong Province
Company Name：SHANDONG HUAQUAN POWER CO.,LTD
