Borewell Cluster
Borewell Pipe Sizes by Depth — shallow, medium, deep aquifer guide
Depth-band guidance for casing OD, wall thickness, screen length, column pipe class, and pump clearance.
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Borewell pipe size by depth depends on drilled diameter, aquifer formation, pump size, and collapse risk. Shallow bores often use 150-180 mm casing, medium wells 180-250 mm, and deep or industrial wells 250-300 mm with heavier wall and better joints.
What casing size works for shallow borewells below about 80 metres?
Shallow stable bores commonly use 150-180 mm casing with moderate wall thickness, provided the selected pump has clearance. Use slotted lengths only across the aquifer. Keep enough annular space for gravel pack, sanitary seal, and future pump removal later safely.
Shallow agricultural bores are often price-sensitive, but they still need a proper diameter decision. If the casing is too small, the pump may fit on installation day but jam when scale, sand, or cable ties add obstruction. If it is too large, drilling and casing cost rise without improving yield enough materially. The bore log should define where blank casing ends and screen begins.
For alluvial shallow wells, 150 or 180 mm steel casing is common. Wall thickness can be moderate where formations are stable, but handling damage is still possible. Use IS 4270 steel casing when the site expects rough lowering or needs welded/threaded steel. Use IS 12818 uPVC where corrosion resistance and lower weight are preferred within class limits.
Do not put slotted pipe through the full depth. CGWB construction practice places screen or slots across water-bearing horizons, while blank casing seals unstable or contaminated strata. That separation protects water quality and reduces sand entry into the pump.
How should medium-depth borewells from 80 to 180 metres be sized?
Medium-depth wells usually need 180-250 mm casing, stronger threaded joints, and more careful screen placement. Wall thickness should account for caving formations and installation load. Column pipe class must be selected from drawdown and total dynamic head, not depth alone.
Medium-depth wells are where underspecification starts to become expensive. The casing string is heavier, more joints are involved, and the pump may be installed below large seasonal drawdown. A 180 mm casing can be adequate for many farm pumps, while 200 or 250 mm casing gives more clearance for larger submersibles, gravel pack, and retrieval.
Depth increases the importance of straightness and thread quality. A crooked joint near the top can magnify alignment problems down the string. For threaded-and-coupled casing, inspect sample make-up and coupling count before dispatch. For welded bevel-end strings, assign weld quality and coating repair responsibility explicitly.
Pump column pipe must be chosen after water levels are known. Medium-depth does not automatically mean high HP, but it often means higher total dynamic head after drawdown. Select uPVC class or steel wall with a margin for shut-off pressure and surge.
What changes for deep borewells above about 180 metres?
Deep borewells need conservative casing OD, heavier wall, reliable joints, and pump-retrieval clearance. 250-300 mm casing is common for industrial or high-yield wells. Column pipes should be rated for head, surge, suspended load, and repeated maintenance pulls later safely too.
Deep wells punish small mistakes. More joints mean more chances for leakage or misalignment. External formation pressure, crooked bores, and installation stress increase. Heavier IS 4270 steel casing and heavy-duty threaded couplings are commonly preferred, especially where the pump is expensive or downtime affects production.
Casing OD also relates to future maintenance. A deep pump may need periodic pulling for motor service, cable replacement, or sand issues. Coupling OD, cable guards, and pump diameter must all pass freely through the casing. Saving money with a tight bore can create a lifetime service problem.
For deep tube wells using uPVC systems, stay inside the manufacturer’s depth and pressure class. If the depth, suspended load, or handling method exceeds that guidance, move to steel column pipe or a hybrid design. The RFQ should state depth band clearly so suppliers do not quote shallow-well material by mistake.
How do aquifer type and screen design affect borewell pipe size?
Loose sand, gravel, clay, and hard rock require different slot areas, blank lengths, and casing strength. Pipe size should follow the bore log and expected yield. Poor screen design causes sand pumping even when casing diameter and wall are correct.
Aquifer type drives screen decision. Fine sand needs controlled slot width and gravel packing; coarse gravel can accept larger open area; hard rock may use casing only through overburden with open hole below. A single pipe size cannot fix a screen that does not match formation grain size.
The CGWB manual emphasizes well development after construction to remove fines and stabilize flow. If development is skipped, the pump can draw sand through slots and damage impellers. Procurement can help by ordering the right mix of blank and slotted lengths, but installation practice completes the job.
For tenders, ask the drilling contractor to mark depth intervals for blank casing, screen, and sump. Quote those lengths separately. This creates a transparent bill of materials and prevents disputes when the site suddenly asks for more slotted pipe after the rig is already running.
Specifications
| Entity | Borewell pipe size selection by depth band |
|---|---|
| Size range | 150-180 mm shallow; 180-250 mm medium; 250-300 mm deep/high-yield typical |
| Pressure / collapse attribute | Wall thickness rises with depth, caving risk, and installation load |
| Threading attribute | Threaded-and-coupled preferred for repeatable deep-well assembly |
| Screen attribute | Slot/open area selected by aquifer grain size and bore log interval |
| Documentation | Bore log, MTC or class certificate, depth schedule, coupling and slot inspection |
Standards cited for Borewell Pipe Sizes by Depth
Reference standards cited on this page
- IS 4270 — Steel tubes used for water wells — specification (Bureau of Indian Standards)
- IS 12818 — Unplasticized PVC screen and casing pipes for bore/tube wells (Bureau of Indian Standards)
- CGWB Drilling Manual — Manual on construction and maintenance of tube wells (Central Ground Water Board)
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