Casing selection affects borewell stability, pump clearance, and the way each joint is lowered. This guide compares steel pipe types by intended depth, geological fit, joint form, and buying basis for Indian projects. It then provides a side-by-side table, a decision path, and an RFQ checklist. Kanpur buyers serving Unnao, Hardoi, and Bundelkhand can use the same standard-and-class logic while quoting on an ex-warehouse Kanpur basis.
Comparison at a glance
| Standard | Wall (150 NB) | Depth guidance | Best geology | Commercial basis | Corrosion basis |
|---|---|---|---|---|---|
| IS 4270 Heavy | 5.40 mm | Check well design and joint capacity | Hard-rock projects when the approved design calls for it | Current written quotation | Assess water and soil chemistry |
| IS 1239 Heavy (Class C) | 5.40 mm | Candidate only after a project calculation | Projects whose approved casing design permits utility pipe | Current written quotation | Assess coating, allowance, and maintenance |
| ASTM A53 Gr B Sch 40 | 7.11 mm | Project calculation required | Industrial / process-water projects that name A53 | Current written quotation | Assess the actual environment |
| Flush-joint (FJ) Casing | Per approved product drawing | Check connection and bore clearance | Restricted-clearance holes when the design calls for FJ | Current written quotation | Assess the complete casing system |
Ranked recommendations
How to choose borewell pipe in Kanpur and UP
A seven-line decision path for turning the bore log and approved well design into a complete pipe RFQ:
- Start with the bore log, aquifer-screen design, water chemistry, pump envelope, and calculated casing loads. Do not select IS 1239 or assign a safe depth from geology and depth labels alone.
- Evaluate IS 4270 Heavy Class with the specified threaded-and-coupled connection when the approved design names it. Check pipe-body collapse, connection tension, corrosion allowance, bore clearance, and lowering loads for the actual well.
- Where coupling clearance is restricted, evaluate a flush-joint connection against its approved product drawing. The drawing must supply the connection capacity, make-up procedure, gauges, and compatible handling tools; a generic price premium cannot establish suitability.
- Use ASTM A53 Grade B Type E Schedule 40 only when the approved well design and purchase specification name that exact product. TPI, hydrotesting, or industrial service does not select A53 automatically. Define the required inspection document, witness points, tests, identity, and joint-numbered lowering record separately.
- Write the RFQ with standard and class, OD, wall thickness, plain versus slotted lengths with slot width, thread type (V or square), coupling count, length per piece, tonnage, MTC with heat traceability, and delivery basis. State whether each piece is plain, slotted, or blank casing instead of writing only the NB size.
- Estimate plain-pipe mass with the site weight formula W = (OD − t) x t x 0.02466, using OD and wall thickness in millimetres to obtain kilograms per metre. Apply the formula to the ordered dimensions, then add the documented mass of couplings, screens, and handling accessories. Use the resulting schedule for transport planning only; the rig supplier must confirm lifting capacity for the complete lowering assembly.
- Measure OD and wall using the receiving plan, match heat numbers to the MTC, and confirm slotted pieces match the marked aquifer lengths. State collection or delivery point, loading responsibility, freight basis, taxes, availability, and promised date only as written in the current quotation and order.
Bottom line
Use the standard, class, connection, screen schedule, and corrosion protection approved for the actual bore. IS 4270, IS 1239, ASTM A53, and flush-joint products are not interchangeable labels; the well designer must approve the complete casing string and its installation method. Before issuing the order, freeze a piece-by-piece casing and screen schedule tied to the bore log, pump envelope, connection drawing, calculated loads, deterioration allowance, and lowering sequence. Define how altered conditions discovered during drilling return to the designer for review. The receiving file should reconcile the PO, approved revisions, certificate, licence or marking evidence where required, heat or lot identity, dimensions, thread-gauge results, coupling count, slot schedule, packing list, and observed condition. Keep nonconforming lengths physically outside the lowering sequence until the responsible engineer records a disposition. Commercial acceptance is separate: state the offered quantity, measurement and invoice basis, packing, collection or named delivery point, loading, freight, taxes, date, and validity in the current written quotation and contract.
