Saling -Filter of Deep Tube Well
A deep tube well filter, often called a strainer is prevents sand, debris, and sediment from entering the pipe while allowing clean water to flow into the well. It’s typically a perforated or slotted stainless-steel/UPVC pipe at the well’s lower end, sometimes with a fine mesh screen, designed to work with specific geological conditions to ensure clean water extraction, protect the pump, and prolong the life of the well.
How it works
- The filter is placed at the bottom of a deep tube well, positioned within an aquifer.
- It allows water to flow in while blocking sand and other sediment into the well pipe.
- This protects the pump from damage and keeps the water supply cleaner.
Key features
- Material: Often made of stainless steel and also available in UPVC, C-D-E Class.
- Design: perforated or slotted pipe, or mesh screen.
- Placement: The length and location of the filter are determined by the location of the aquifer.
How to select the right slot size
- Analyze the aquifer’s sediment: A sieve analysis to determine the average particle size and match slot size to sediment,
- Fine sand: Use a smaller slot size, such as 0.1 mm to 0.75 mm.
- Coarse sand and gravel: up to 3 mm.
- Consider filtration efficiency: A smaller slot size is more precise but may reduce water flow. A larger slot size increases the open area, which can improve efficiency and reduce entrance velocity, minimizing sand pumping.
- Choose a robust filter type: For deep or high-pressure wells, slotted or wedge wire screens are recommended for their strength and durability.
Different Size:
Common standard slot sizes include (in mm):
- Fine: 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm
- Medium: 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm
- Coarse: 1.0 mm, 1.2 mm, 1.5 mm, 2.0 mm, 3.0 mm