Views: 50 Author: Mepcato_Viko Lau Publish Time: 2025-10-10 Origin: www.mepcato.com
Selecting the right submersible pump is crucial for the project's success. You need to focus on the following core parameters:
1. Flow Rate (Q - Units: Cubic meters per hour m³/h or Liters per second L/s)
Definition: The volume of water the pump can deliver per unit of time.
How to Determine: Calculate based on your irrigation requirements.
Simplified Formula: Required Flow Rate (m³/h) = (Total Irrigated Area (mu) × Water Requirement per mu per session (m³/mu)) / Planned Irrigation Time (hours)
Agricultural Irrigation: Depends on crop type, planted area, climate, and irrigation method (flood, drip, sprinkler). A general rule of thumb is that each mu of land requires 20-50 cubic meters of water per irrigation session. You need to calculate the required flow rate based on the irrigation cycle and duration.
Landscape Irrigation: Depends on the green area, plant types, and the number and model of sprinklers. Add up the rated flow of all sprinklers and multiply by a safety factor (1.1-1.2) to get the approximate required flow rate.
2. Head (H - Unit: Meters m)
Definition: The total height the pump can lift water. This is not just the vertical height difference; it also includes pipeline friction loss.
How to Calculate: Total Dynamic Head Required = Vertical Lift + Friction Loss Head
Vertical Lift: The vertical height difference from the dynamic water level of the source (water level when the pump is operating) to the highest point of the discharge outlet.
Friction Loss Head: The energy lost due to friction as water passes through pipes, elbows, valves, and filters. This value is usually obtained from charts or calculations. A rough estimate is 10%-20% of the vertical lift (longer pipes, more elbows, and smaller diameters increase the loss).
Example: If the vertical height from the water surface to the field is 20 meters and the pipe length is 100 meters, the total head required might be 20m + (20m * 15%) = 23 meters or more.
3. Power and Voltage
Power: Once the flow and head are determined, the required power is essentially determined. Higher power generally indicates greater flow and head capacity. Select a pump with corresponding power based on your calculation.
Voltage:
Single-Phase (220V): Suitable for low-power submersible pumps (typically below 3kW), commonly used for small landscapes or home orchards.
Three-Phase (380V): Suitable for high-power pumps, offering more stable operation and higher efficiency. This is the preferred choice for agricultural irrigation.
4. Pump Type and Material
Type:
Clean Water Pump: Suitable for clean river water with low sediment content.
Sewage Pump/Vortex Pump: If the river is turbid and contains significant silt, leaves, or other solids, choose a sewage pump with strong passage capacity, designed to be less prone to clogging.
Material:
Cast Iron: Cost-effective but less corrosion-resistant, suitable for short-term or light use.
Stainless Steel: Highly corrosion-resistant, longer lifespan, especially suitable for slightly acidic/alkaline water or long-term submersion. This is the recommended choice.
Define Requirements: Determine the irrigation area, method, and water source conditions (water quality, water depth variation).
Calculate Flow Rate: Based on the irrigation schedule and area, calculate the required water volume per hour.
Calculate Head: Measure the vertical lift and estimate pipeline friction loss to determine the Total Dynamic Head required.
Select Type and Material: Choose between a clean water pump or sewage pump based on water quality (clear/muddy). Select cast iron or stainless steel based on budget and durability needs.
Determine Voltage and Power: Based on the site's power supply and the calculated flow and head, determine the voltage and power range.
Consult the Pump Performance Curve: Before finalizing a specific model, ask the supplier for its "performance curve." Ensure that the intersection point of your required Flow and Head falls within the pump's high-efficiency operating range, not at the edges of the curve.
Rule of Thumb - Size Up: If the budget allows, select a pump with a 10%-15% margin for both flow rate and head to accommodate future needs or losses from aging pipes.
Brand and After-Sales Service: Choose a reputable brand and ensure reliable after-sales service for timely technical support if problems arise.
Consult a Professional: If your irrigation system is complex, it is highly recommended to consult a pump distributor or irrigation engineer who can provide more precise selection advice and system design.
VN Series （ 400W to 750W)
RS & CRS Series (400W)
CS Series ( from 750W to 1500W)
CCS series ( from 400W to 750W )
Hope this detailed guide helps you successfully apply and select the right submersible pump! Wishing you efficient irrigation and a fruitful harvest (or a beautiful garden)!
