Complete Guide to Borewell Piping Systems: Casing, Screen & Column Pipes Explained

Underground water sources have been used for water supply for generations. Finding access to a reliable underground source of water is a game-changer for agriculture, farming, industrial setups, and even residential complexes. However, drilling a borehole is only half the process, and the efficient functioning of your water source depends heavily on the borewell piping system that supports it.

Choosing the right pipes prevents the borehole from collapsing and keeps the sediments out of your water supply. It ensures that your water supply is delivered to the surface efficiently.

This comprehensive guide breaks down the critical components of a borewell piping system: casing pipes, screen pipes and column pipes.

Casing Pipes

 A borewell is drilled through various levels of soil, gravel and rock. Without structural support, the surrounding earth will cave in, which will bury the expensive submersible pump and ruin the well. This is where casing pipes play an important role.

  What Do Casing Pipes Do? 

• Structural Integrity: They line the borehole wall, preventing loose soil, sand, and stones from collapsing into the well.
• Sealing Surface Pollution: They seal off upper, contaminated water zones, ensuring that only clean, deep groundwater enters your system.

 Why PVC borewell pipes are industry standard?

 Mild steel or galvanised iron pipes were used for casing in the older times. However, in modern times, the focus has shifted decisively toward uPVC borewell pipes for multiple reasons:

• Corrosion resistance: Unlike iron, PVC does not rust, scale or even corrode when exposed to soil, chemicals and water even after decades.
• Lightweight & easy to install: uPVC pipes are significantly lighter than the traditionally used metal pipes. Their light weight makes it easier to transport and install, reducing the costs. They feature specialised male-to-female threading that ensures leak-proof joints without the need for welding.
• High collapse resistance: uPVC casing pipes are engineered to withstand hydrostatic pressure from the deep underground layers.

Screen Pipes 

Water does not just sit in a massive underground cave; it is trapped inside water-bearing sand and gravel formations called aquifers. A borewell filter pipe allows the water to enter your well while keeping the dirt out. The pipe is commonly known as a screen pipe.

How Do Screen Pipes Work?

Screen pipes are essentially casing pipes featuring scientifically designed slots or perforations. They are strategically placed at the depth of the water-bearing aquifer.

• Water Inflow: The slots allow groundwater to seep smoothly into the borewell casing.
• Sediment Filtration: The slot width is precisely engineered to hold back sand and gravel particles. Often, a layer of graded gravel (gravel packing) is placed around the screen pipe to act as a primary natural filter.

A high-quality PVC screen pipe prevents sand pumping. Sand pumping not only ruins the water quality, but it also acts like sandpaper inside the submersible pump, destroying the internal impellers.

Column Pipes

Once the water is safely filtered inside the casing pipe, it is lifted to the surface. The column pipe is used for this procedure. Column pipes are connected directly to the submersible pump and suspended vertically inside the casing pipe all the way down to the water level.

Column pipes are made extremely durable to support the heavy weight of the submersible pump, the entire column of water and the dead weight of pipes themselves. The pipes handle:

• Tensile Load: Holding up a pump hundreds of feet deep requires immense tensile strength so the pipe doesn’t snap.
• Internal Pressure: They must handle high hydraulic pressure generated by the pump pushing water upward.
• Water Hammer: Sudden pump shutdowns create pressure surges (water hammer). Column pipes must absorb these shocks without cracking.

Modern uPVC column pipes feature unique thickened ends with square threads and rubber O-rings to ensure they can easily bear these heavy loads while remaining completely leak-proof.

Conclusion:

A borewell is a long-term investment that can last more than 2 to 3 decades. A cheap, substandard piping system can save money upfront, but it can lead to huge financial burdens in the long run, potentially even damaging the borewell itself.

For a trouble-free system, always choose high-grade, certified uPVC borewell & column pipes tailored to the specific depth of your well. Our pipes incorporate a unique circlip lock system along with square threads; this guarantees that the joints do not slip under intense pressure or weight. By pairing the right casing, screen, and column pipes, you guarantee a clean, uninterrupted, and long-lasting supply of water.