uPVC Casing Pipes — Graded for the Soil Pressure They'll Actually Face
A borewell doesn't fail because of the pump. It fails because the casing collapsed under soil pressure at depth, or because sand and silt got past a poorly designed screen section and started wearing out the pump from the inside. Both are casing pipe problems, and both are preventable with the right grade specified for the actual ground conditions.
Trity Pipes manufactures uPVC casing pipes for borewell and tubewell applications, built to IS 12818 and graded specifically for shallow, medium, and deep well conditions, so you're not guessing which pipe holds up in your soil.
Why Casing Pipe Selection Isn't a Commodity Decision
It's tempting to treat casing pipe as a straightforward per-metre purchase, but the wrong grade in the wrong soil condition is one of the most common causes of a stuck or collapsed borewell.
Graded for depth, not a single generic spec. Soil pressure increases with depth, and a shallow-well pipe pushed into a deep installation will deform or collapse under load it wasn't built for. We manufacture across the standard CS, CM, and CD classifications specifically so the pipe matches the actual pressure environment.
Virgin uPVC compound, not recycled blend. Casing pipe under sustained soil pressure needs consistent wall strength across its entire length. A recycled or blended compound introduces inconsistency you can't detect until the pipe is already downhole and under load.
Precision slotting on screen sections. Poorly executed slotting, especially vertical slotting along the pipe length rather than horizontal, weakens the pipe body at exactly the point it needs strength most. Ours is engineered to maintain structural integrity while still allowing the water inflow a screen section is there for.
CNC-cut trapezoidal threading. Joint threads are cut on precision CNC machines to a trapezoidal profile, which seats more securely under load than a simpler thread form and reduces the risk of a joint slipping or decoupling during lowering, exactly the moment you don't want a connection to fail.
If you're also sourcing the column pipe for the same installation, see our uPVC column pipes range, casing and column pipe do different jobs in the same well and shouldn't be specified interchangeably.
Product Range and Classifications
Casing pipe is classified by the depth and soil pressure condition it's built to handle, not just by diameter.
CS, Casing Shallow is built for shallow borewells where soil pressure on the casing is minimal, typically installations up to roughly 80 metres.
CM, Casing Medium steps up wall thickness for medium-depth installations, generally in the 80 to 250 metre range, where soil pressure and structural demand both increase.
CD, Casing Deep is engineered for deep borewell installations exceeding 250 metres, where the casing has to withstand significant and sustained soil pressure without deforming.
SC, Screen Casing carries precision-cut perforations that let groundwater into the well while filtering out sand and silt, positioned at the productive aquifer interval identified during drilling.
We manufacture across the standard diameter range used in Indian borewell construction, from smaller domestic and agricultural installations through to larger diameters used in industrial and municipal water supply projects. Exact size, class, and current stock are confirmed at the time of enquiry.
| Class | Depth Range | Typical Application |
|---|---|---|
| CS (Casing Shallow) | Up to 80 metres | Domestic and small agricultural borewells |
| CM (Casing Medium) | 80 to 250 metres | Standard agricultural and residential installations |
| CD (Casing Deep) | Beyond 250 metres | Industrial, municipal, and deep agricultural installations |
| SC (Screen Casing) | Positioned at aquifer interval | Water inflow with sand and silt filtration, any depth class |
Depth ranges above are general classification bands used across the industry. Actual soil conditions, drilling method, and installation depth should always be confirmed with our technical team before finalizing your grade, since two borewells at the same depth can face very different pressure conditions depending on the geology involved.
Check available sizes and classes →
Where This Gets Specified
Agricultural and irrigation borewells. The largest use case for casing pipe in India, protecting the bore from collapse across shallow and deep agricultural water extraction installations alike.
Domestic and residential water supply. Household and housing society borewells, where casing failure means a full redrilling cost, not a simple repair.
Industrial and mining water extraction. Facilities requiring reliable groundwater access where borehole integrity directly affects operational continuity.
Government and municipal water schemes. PHED (Public Health Engineering Department) projects, municipal water supply tenders, and rainwater harvesting installations, where IS 12818 compliance and documented batch testing are typically mandatory tender requirements, not optional extras.
What Every Batch Is Tested For
Casing pipe failure at depth is not a repairable problem, which is exactly why batch testing before dispatch matters more here than on almost any other pipe category we manufacture.
Tensile strength and hoop stress testing. Samples are tested to confirm the pipe body withstands the collapse pressure it'll face at its rated depth, not just at surface conditions.
Impact resistance. Casing strings are handled roughly during transport and lowering, dropped, dragged, and stacked at the drill site. Impact testing confirms the pipe survives that handling without hairline damage that only becomes a failure once it's downhole.
Vicat softening temperature testing. Confirms the material holds its structural properties across the temperature range the pipe will actually experience underground and during transport in Indian conditions.
Dimensional accuracy on threaded joints. A casing string is only as strong as its weakest joint. Thread consistency across every pipe in a batch is what determines whether the string holds together as a continuous, uniform structure at depth.
Full IS 12818 test documentation and our ISO 9001:2015 certification are available on our certifications page, and tender-specific documentation is provided on request for government and PHED project bids.
Why uPVC Outperforms Metal Casing
Metal casing was the historical default, largely because plastic alternatives weren't proven at the depths and pressures involved. That's no longer the case.
No corrosion in permanent groundwater contact. Metal casing corrodes continuously in the exact environment it's installed in, which weakens the structure over time and can affect extracted water quality. uPVC doesn't react with groundwater at all.
Significantly lighter for handling and lowering. A uPVC casing string weighs a fraction of an equivalent metal string, which reduces the rigging and equipment needed for controlled lowering, particularly relevant on deep installations where string weight becomes a real handling constraint.
No rust particulate in extracted water. Water drawn through a corroding metal casing can carry rust and altered mineral content. That's a quality issue on agricultural water and a genuine safety issue on domestic supply.
Lower total installation cost. Between material cost, lighter handling equipment requirements, and the absence of any corrosion-related replacement cycle, uPVC casing typically works out cheaper across the life of the installation, even when metal looks competitive on a per-metre basis upfront.
Installation Notes That Prevent a Stuck or Collapsed Well
Most casing failures in the field trace back to installation practice or incorrect grade selection, not a defective pipe.
Match the class to actual measured depth, not an estimate. Under-speccing CS or CM into what turns out to be a CD-depth installation is the single most common cause of casing collapse. Confirm depth before finalizing your order, not after the string is already partially assembled.
Control lowering speed to avoid shock loading. Lowering too fast creates water hammer effects and dynamic shock on joints. On deep installations beyond roughly 150 metres, a properly rated tripod and block-and-tackle system is necessary to maintain controlled, steady descent.
Position the screen section against the actual productive aquifer, not by estimate. Verify total assembled length against the measured borehole depth to confirm the screen section sits in the correct interval. Misplacement here is a common cause of poor yield in an otherwise correctly constructed borewell.
Treat gravel packing as a performance step, not a finishing step. Uniformly graded gravel introduced into the annular space around the screen section directly governs the completed well's hydraulic performance. Rushing or skipping proper gravel packing undermines everything done correctly up to that point.
Our full uPVC casing pipes installation guide covers this process in more depth if you're managing installation directly rather than through a drilling contractor.
Sourcing in Bulk
We supply borewell drilling contractors, government and PHED project teams, agricultural equipment dealers, and procurement teams sourcing for single installations and multi-site projects alike. Standard sizes and classes are held in stock at our Delhi NCR facility with dispatch across 20+ states, and for larger or custom orders, our team confirms lead time upfront.
IS 12818 test reports and ISO 9001:2015 certification are provided on request for tender and institutional procurement documentation.
Get a bulk quote for your project →
Frequently Asked Questions
What's the difference between CS, CM, and CD casing pipe?
The classes differ in wall thickness, built to withstand the soil pressure at their intended depth range. CS suits shallow wells up to roughly 80 metres, CM covers medium depths from 80 to 250 metres, and CD is built for deep installations beyond 250 metres. Using the wrong class for your actual depth is the most common cause of casing failure.
What Indian Standard governs uPVC casing pipes?
IS 12818 covers unplasticized PVC screen and casing pipes for bore and tubewells, specifying material composition, dimensional tolerances, mechanical properties, and testing requirements. Compliance is typically mandatory for government and PHED project tenders.
Can casing pipe and column pipe be mixed from different manufacturers?
They can, but thread and coupler compatibility should be confirmed before ordering. We recommend sourcing casing and column pipe together where possible to guarantee joint compatibility across the full assembly, see our column pipes range for the riser side of your installation.
What sizes do you manufacture?
We manufacture across the standard diameter range used in Indian borewell construction. Contact us with your project's depth and diameter requirements to confirm current sizes and stock.
Is there a minimum order quantity for bulk supply?
We work with both single-installation and multi-project orders. Share your project scale and timeline with our team and we'll confirm pricing and lead time.
Do you supply screen (slotted) casing pipe as well as plain casing?
Yes, our range includes both plain casing pipe and screen casing pipe with precision-cut slots for aquifer sections requiring water inflow with sand and silt filtration.
Why are casing pipes blue instead of the standard grey or white?
Blue is the recognized industry convention for technical-grade casing pipe in India. It visually distinguishes casing pipe from standard plumbing pipe on a job site, signaling higher collapse resistance and specialized threading to anyone handling material at the drill site.
Ready to Order?
Whether you need pricing for a single borewell or bulk supply across a multi-site drilling project, our team responds directly with grade guidance based on your actual depth requirement.
Call +91-9821030072 or 01204142307, email info@tritypipes.com, or send an enquiry and we'll confirm availability.
Completing the rest of your borewell system? Check our uPVC column pipes for the riser side of the installation, or explore our CPVC and SWR pipes & fittings ranges for the rest of your plumbing and drainage needs.