Borewell Column Pipe vs Casing Pipe: What Is the Difference?
Borewell Column Pipe vs Casing Pipe: Understanding the Differences
If you are planning a borewell installation for your home, farm, or industrial unit, you have likely come across two terms: casing pipe and column pipe. Many buyers assume these are the same thing or use the terms interchangeably. They are not the same, and confusing the two can lead to wrong purchases, installation failures, and expensive corrections.
Understanding the difference between column pipe and casing pipe is essential before you invest in a borewell system. Both are among the most important types of borewell pipes, but each one serves an entirely different function at a different stage of the borewell.
This guide explains exactly what each pipe does, how they differ, and how to choose correctly for your project.
TLDR: Key Takeaways
- Casing pipe lines the borehole walls to prevent collapse and contamination.
- Column pipe connects the submersible pump to the surface and carries water upward.
- Casing pipe is installed during drilling; column pipe is installed when fitting the pump.
- Both are made from uPVC but differ in diameter, joint design, and pressure handling.
- A complete borewell system requires both pipes working together.
- Using the wrong pipe for either role will compromise the entire system.
Borewell Column Pipe vs Casing Pipe at a Glance
| Feature | Casing Pipe | Column Pipe |
|---|---|---|
| Primary role | Structural support for borehole walls | Water conveyance from pump to surface |
| Installed during | Drilling and borehole preparation | Pump installation |
| Position in borewell | Lines the outer walls of the borehole | Runs inside the casing, connected to pump |
| Load it handles | Soil pressure, borehole collapse | Pump weight, water pressure, torque |
| Available classifications | CS (Shallow), CM (Medium), CD (Deep) | ECO, MED, STD, Heavy pressure classes |
| Joint type | Threaded with rubber ring seal | Square thread with rubber ring locking |
| Standard | IS 12818 | Company standard with bi-axial orientation |
What Is a Borewell Casing Pipe and What Does It Do?
A borewell casing pipe is a structural pipe inserted into a drilled borehole to line its walls, prevent the surrounding soil or rock from collapsing inward, and protect the groundwater inside from surface contamination.
When a borehole is drilled into the ground, the walls of that hole are exposed to surrounding soil, sand, and rock. Without a casing, loose or unstable layers can cave in, blocking the well or damaging equipment. Contaminants like agricultural chemicals, sewage, and surface water can also seep in and pollute the groundwater.
AKG borewell casing pipes are manufactured from high quality uPVC resin conforming to IS 12818 standards. They are available in three classifications based on borewell depth:
- CS (Shallow): For borewells up to 80 metres
- CM (Medium): For borewells up to 250 metres
- CD (Deep): For borewells beyond 250 metres
Both plain and slotted (screen) pipe variants are available. Slotted pipes are placed near water-bearing aquifer zones to allow controlled water entry while keeping sand and soil out. AKG casing pipes are fully rust-proof, chemically resistant, and maintenance-free, which eliminates the corrosion and encrustation problems that affect conventional metal casing materials.
What Is a Borewell Column Pipe and What Does It Do?
A borewell column pipe is the pipe that connects the submersible pump at the bottom of the borewell to the surface outlet. It runs vertically inside the casing, carrying extracted groundwater upward under pressure from the pump to overhead tanks, pipelines, or direct outlets.
Unlike casing pipes, column pipes must handle a different combination of forces: internal water pressure from the pump, the physical weight of the pump and water column hanging below, and the torque and vibration generated by continuous pump operation.
AKG uPVC column pipes are specially designed for submersible pump applications. They are manufactured using a unique bi-axial orientation technique during pipe extrusion, which gives higher drop impact and notch impact strength to the pipes.
The joint system uses specially designed square threads with rubber rings that ensure proper gripping, no slipping, and a 100% leak-proof connection. These threads are high-friction threads that do not open even under the constant forward and reverse torque generated by starting and stopping the pump.
AKG column pipes are available across a wide range of sizes and pressure classes including ECO, MED, STD, and Heavy, in nominal diameters from 1 inch to 4 inches, to suit different pump sizes and borewell depths. The expected service life of AKG uPVC column pipes is 25 to 30 years under normal operating conditions.
Key Differences Between Borewell Column Pipe and Casing Pipe
Position and Function
Casing pipe is the outer structural layer installed during drilling to line and stabilize the borehole. It stays in place permanently. Column pipe is installed inside the casing later along with the submersible pump to carry water up to the surface.
Material & Construction
Casing pipes have a wider diameter to host the pump and column pipe internally. Column pipes are narrower and feature a unique thick-and-thin design at the threaded portion to provide maximum joint strength without adding excess body weight.
Pressure & Load Type
Casing pipes are engineered to resist heavy external crush pressure from surrounding soil and rock. Column pipes are built to handle high internal hydrostatic water pressure alongside enormous vertical tensile loads from the suspended pump weight.
How Both Pipes Work Together in a Complete Borewell System
A complete and properly functioning borewell system needs both types of borewell pipes working in their respective roles.
The casing pipe goes in first, lining the borehole from the surface down through unstable soil layers to create a clean, stable, and contamination-free channel. Once the casing is in place and the water-bearing zone is reached, slotted screen pipes allow water from the aquifer to enter the borewell safely.
The column pipe then goes inside the casing, running from the submersible pump at the bottom all the way to the surface. The pump pushes water up through the column pipe under pressure, delivering it to wherever it is needed.
Remove either component and the system fails. Without the casing, the borehole collapses or becomes contaminated. Without the column pipe, there is no way to bring water from the pump to the surface. Both are essential, and both must be chosen correctly for the depth, load, and geological conditions of the specific site.
Common Mistakes Buyers Make When Choosing Borewell Pipes
- Interchanging pipe types: Buying casing pipe when column pipe is needed, or vice versa. This stems directly from ignoring the functional differences.
- Selecting the wrong depth class: Using CS (shallow) pipes for a deep borewell requiring CM or CD specifications results in structural failure under load.
- Choosing insufficient pressure classes: Using ECO class column pipes with high-horsepower pumps leads to underground joint failure.
- Prioritising price over specification: Cheaper pipes that do not match the required depth and load ratings create expensive and highly disruptive underground problems later.
- Ignoring slotted pipe placement: Placing plain casing in aquifer zones instead of slotted screen pipes significantly reduces the well's water yield.
How to Choose the Right Pipe for Your Borewell
Choosing correctly comes down to three baseline questions:
When in doubt, consult a qualified borewell contractor or contact the manufacturer directly to get guidance based on your specific site conditions.
Conclusion
The borewell column pipe vs casing pipe question has a clear answer: they are two entirely different pipes serving two entirely different purposes in the same system. Casing pipe protects and stabilizes the borehole structure. Column pipe delivers water from the pump to the surface. One cannot substitute for the other.
AKG Group India manufactures a complete range of borewell casing pipe and borewell column pipes engineered specifically for Indian groundwater conditions, available in all depth classifications and pressure ratings to suit every residential, agricultural, and industrial borewell requirement.
Frequently Asked Questions
What is the main difference between a borewell column pipe and a casing pipe?
A casing pipe lines the borehole walls to prevent soil collapse and contamination. A column pipe runs inside the casing and connects the submersible pump to the surface, carrying water upward. Casing provides structural support, whereas column pipe provides the water conveyance pathway.
Can I use a casing pipe instead of a column pipe in a borewell?
No. Casing pipes and column pipes are engineered for fundamentally different load conditions. Casing pipes resist external soil pressure, while column pipes resist internal water pressure and the tensile load of the pump weight. Using the wrong pipe type results in premature failure.
What are the types of borewell pipes available in India?
The main types are casing pipes and column pipes. Casing pipes come in CS (Shallow), CM (Medium), and CD (Deep) classifications under IS 12818. Column pipes are available in ECO, MED, STD, and Heavy pressure classes across multiple diameters. Both are manufactured in uPVC.
How deep can AKG borewell casing pipes go?
AKG borewell casing pipes are available in three depth classifications. CS pipes are suitable for up to 80 metres, CM pipes up to 250 metres, and CD pipes are designed for deep borewells extending beyond 250 metres. Each is optimized for the hydrostatic and soil pressure of that depth.
What makes AKG column pipes suitable for deep borewells?
They use a unique bi-axial orientation technique for higher impact strength and feature square thread joints with rubber ring seals to resist pump torque. A special thick-and-thin construction strengthens the joints without adding body weight, providing an expected service life of 25 to 30 years.
