Submersible column pipe sizing starts with the approved pump data, discharge, total dynamic head, water levels, suspended load, bore clearance and manufacturer limits, not HP alone. The responsible designer must select diameter, pressure class, material and joint system for the complete installation.
What a submersible column pipe is and what it is not
A column pipe or riser, hangs inside the casing and carries discharge from the submersible pump to the surface. It is not the casing that holds the bore open and it is not the field delivery line. Steel risers are bought by OD, wall and thread. uPVC risers are bought by class and coupler design.
The approved well design must specify casing and screen material and standard. The pump column and surface delivery line are separate components with their own approved specifications. Keep all three schedules separate so trade names do not obscure dimensions or duties.
IS 12818:2010 is a screen-and-casing standard with CS/CM/CD depth classes. A proprietary pump-column table governs a different component, so do not compare or combine the two as "stricter" alternatives. Specify the riser separately from its approved design and manufacturer data.
See IS 12818 for the uPVC family and IS 4270 for the steel casing around the riser. For farm layouts see agricultural irrigation pipe.
Who should use which column material
Use uPVC where the maker rates its coupler for the operating head and hanging load. Use GI or MS steel when the approved design requires steel. Do not treat an IS 12818 CS casing class as a pump-riser pressure rating.
Kanpur and Unnao farm wells can use uPVC when the selected maker table covers operating head and hanging load. JJM and PWD village-well BOQs should state the material and class. Sugar-mill process-water wells need the same engineering check before material selection.
Hydraulic-cylinder and printing-cylinder shops should not specify column pipe from this page. Fire-system installers need hydrant pipe, not a riser. A borewell column is a hanging pressurised string, not a buried main.
If corrosion is the complaint, compare uPVC against coated or GI steel under the water analysis and project specification. Rough handling can damage any thread. Write the planned handling method on the RFQ.
Steel column mass examples used on this site
The site weight table gives 50 NB medium as 5.03 kg/m and 65 NB medium as 6.44 kg/m as dated mass examples. These rows do not recommend either size for a pump horsepower, depth, flow or duty.
Diameter follows discharge and friction, not HP. The table below only restates figures already on this site so a Kanpur buyer can see mass before ordering steel.
A uPVC riser follows its maker's pressure and hanging-load table. CS, CM and CD apply to IS 12818 casing. GST extra at the legally applicable GST rate stated on the current quotation applies to both materials, ex-warehouse Kanpur. GI delivery pipe after the well head is a separate line on the GI price list.
| NB | OD (mm) | Medium WT (mm) | Mass (kg/m) | Note |
|---|---|---|---|---|
| 50 | 60.3 | 3.6 | 5.03 | Mass reference only; not a pump-sizing rule |
| 65 | 76.1 | 3.6 | 6.44 | Mass reference only; not a pump-sizing rule |
Buying submersible pump column pipes in Kanpur
State the offered length, thread protection, material location, vehicle basis, destination and unloading window on the RFQ. Require the written quotation to confirm each item; this page does not promise routine yard loading or city drops. Use the Lucknow and Unnao pages only as destination-specific procurement guides.
State the required steel MTC, uPVC class or batch records and any TPI scope in the RFQ. The written quotation should confirm which documents and inspection arrangements apply to the offered lot. Ask separately whether cut-to-length can be included when the pump house cannot stand 6 m.
List casing, riser and surface-main requirements separately in the RFQ. Ask the written quotation whether a combined load is feasible for the offered materials; do not assume products shown in the borewell and steel-pipe guides can travel on one truck.
Can pump HP alone decide the column pipe size?
No. HP indicates motor power, not required pipe diameter. Size the column by pump discharge, total dynamic head, friction loss and delivery connection. Two 5 HP pumps can need different pipe sizes if flow rate or lift differs significantly onsite.
Horsepower is the quickest field reference, so contractors often ask for "pipe for 5 HP pump." Procurement should treat that as a starting question, not a specification. The column pipe must carry the pump’s discharge without excessive velocity, friction loss or pressure. A high-head low-flow pump and a low-head high-flow pump can share the same HP but need different riser diameters.
A complete selection uses pump curve, static water level, seasonal drawdown, delivery elevation, bends, valves and required flow at the outlet. Undersized pipe wastes electricity because friction head rises. Oversized pipe costs more and may make handling harder, but it can reduce losses on long runs. The best quote includes both the pump data sheet and the bore depth.
IS 12818 is useful for uPVC tube-well pipe references, while steel column pipes are chosen by OD/NB, wall, thread and coating. If the pump supplier publishes a recommended riser size, use that unless the bore conditions force a different material.
How does borewell depth change column pipe pressure class?
Depth changes hydraulic and suspended-load inputs, but it does not by itself prescribe heavier steel or a higher uPVC class. Use the approved system calculation and the selected manufacturer's limits for pipe, joints, pump, cable and support.
Pressure at the lower column is governed by water head and pump operation. A deep bore with a low-yield aquifer may have significant drawdown, so the pump works harder during summer. Shut-off pressure can exceed normal operating pressure when a valve is closed. Add surge from quick starts, non-return valve action and generator voltage variation.
Depth also affects mechanical load. The design must account for the intended load path, water and pipe mass, pump mass, cable restraint, joints, start torque, installation and retrieval plan. Do not select threaded steel or PVC-U from depth alone.
Ask the installer whether a separate stainless safety rope or support cable is used. If the pipe is not intended to carry full pump weight, the support system must be specified and installed correctly. Procurement should not assume a low HP pump means low risk when the bore is deep.
Should column pipes be steel, GI or uPVC for agricultural wells?
Do not select uPVC, GI or MS from a universal depth, water-quality, handling, heat or retrieval rule. The approved design should compare material compatibility, loads, joints, installation, water analysis, temperature, manufacturer limits, maintenance and local requirements.
Record the pump and bore inputs before comparing materials: approved flow and head, shut-off pressure, column length, suspended load, bore and coupling clearance, water analysis, temperature, installation tools, retrieval plan and required service life.
Ask each manufacturer or engineer to identify the applicable pipe and joint limits, compatibility assumptions, safety factors and exclusions. Compare written design acceptance and whole-life maintenance rather than assuming one material always survives a named site condition better.
Coordinate the column decision with the approved casing, screen, pump-position, cable and support design. Procurement should copy the selected system into the RFQ and reject substitutions that have not been checked against the same inputs.
What information should an RFQ include for submersible pump column pipes?
Include pump HP, model, discharge size, flow, total dynamic head, bore depth, static and pumping water levels, material preference, pipe class, joint type, length per piece, quantity, certificates and delivery location details clearly. Attach pump curve when available onsite too.
A good RFQ lets the supplier quote the pipe, couplings and documentation without guessing. State whether the requirement is for new installation or replacement, because replacement orders must match existing pump connection and bore clearance. Include the delivery PIN and site deadline; drilling seasons compress lead times.
For steel, specify NB/OD, wall thickness, end finish, coating, length and whether MTC is mandatory. For uPVC, specify class, thread design, coupler type and brand constraints if the installer requires interchangeability. Avoid mixing couplers from different systems unless proven compatible.
Request separate quotation lines for the column pipe, any IS 4270 casing and any IS 12818 screen or casing. Require the dimensional schedule to show pump connection, bore clearance and maximum coupling OD so commercial bundling does not hide a system mismatch.
- Pump: model, HP, discharge NB, flow, total dynamic head, shut-off head
- Well: bore depth, static and pumping water levels, casing NB/OD
- Riser: NB or OD, wall or uPVC class, 3 m or 6 m length, total metres
- Ends: steel T&C or uPVC coupler type; one coupler per length
- Documents: MTC for steel, class/batch mark for uPVC; TPI if the tender names it
- Commercial: ex-works Kanpur, GST at the legally applicable GST rate stated on the current quotation, delivery PIN
Worked example: 90 m of 65 NB medium steel riser from Kanpur
The site formula gives 6.44 kg/m for 76.1 mm OD and 3.6 mm wall. Ninety metres of that riser are 580 kg of pipe body before water, couplings and the pump.
This site states steel mass as weight = (OD − t) × t × 0.02466 kg/m. The pipe-weight table lists 65 NB medium as 76.1 mm OD and 3.6 mm wall, 6.44 kg/m. Check: (76.1 − 3.6) × 3.6 × 0.02466 = 72.5 × 3.6 × 0.02466 = 6.44 kg/m.
A 90 m Kanpur Dehat irrigation set then carries 90 × 6.44 = 579.6 kg, rounded here as 580 kg of pipe body. Water inside the riser and the pump mass sit on top of that figure. Do not treat 580 kg as the hanging load the first coupler must hold.
The same 90 m well sits above the IS 12818 CS band of 80 m, so its uPVC casing would be CM, not CS. That class does not rate the riser. Repeat the steel mass check on the weight calculator before the PO.
Common column-pipe mistakes on Kanpur pump jobs
Prevent specification ambiguity by keeping pump data, casing depth class, riser design, surface delivery line, connections and documents separate. Do not predict a failure mechanism from a trade name or purchasing error alone.
Do not convert a 5 HP label into a 50 mm, 65 mm or any other column size. Write the pump model, curve, required flow, total dynamic head, connection, bore clearance and approved riser size on the RFQ.
Under the cited IS 12818:2010 clause 3.3.1 depth bands, a 90 m PVC-U casing enquiry falls in CM rather than CS. The connection system must still come from the approved design and manufacturer; do not infer compatibility or leakage from brand names.
Surface delivery after the well head is a separate product. Copy its approved standard, material, dimensions and joints independently from the riser and keep casing, column and field pipe on separate RFQ lines.
Standards that belong on a column-pipe purchase order
Cite IS 12818:2010 for uPVC screen and casing. Use the maker's declared table for a proprietary uPVC riser. Cite IS 4270:2001 for steel casing and IS 1239 for GI or MS surface delivery. IBR manufacture-and-test forms do not apply.
IS 12818:2010 covers ribbed screen, plain screen and plain casing from 35 mm to 400 mm. CS is up to 80 m, CM above 80 m to 250 m and CD above 250 m to 450 m. Those bands are casing depth classes. Pump column class still follows total dynamic head when the maker table is stricter.
State the required steel MTC and heat identity, uPVC class marks and batch records and any tender-required TPI in the RFQ. The written quotation should confirm the offered document set and whether the named inspection can be coordinated for that lot.
Jal Jeevan Mission work still needs a constructed source well and a riser that matches the pump. The mission page describes rural household tap connections and source sustainability, not a pipe class. Put head, depth and DN on the Kanpur RFQ.
Key points for a submersible column buyer
- Size the riser from discharge and total dynamic head, not from pump HP alone.
- 65 NB medium steel on this site is 76.1 mm OD, 3.6 mm wall and 6.44 kg/m.
- IS 12818 CS stops at 80 m; a 90 m Kanpur well that stays on uPVC is CM.
- Quotes are ex-warehouse Kanpur with GST extra at the legally applicable GST rate stated on the current quotation.
- For steel, state the required MTC and heat-traceability scope in the RFQ. For uPVC, state the required class and batch markings. Confirm the offered document set in the written quotation.