Agricultural Irrigation Pipe Selection: IS 4270, IS 12818, GI vs MS

What agricultural irrigation pipe is and what it is not

On a farm job the word pipe covers three products: IS 4270 casing in the bore, a column or riser on the pump and IS 1239 GI or MS delivery across the field. It is not one stock length and not an IBR boiler tube.

Casing holds the bore open and screens the aquifer. Column pipe hangs inside that casing and lifts discharge. Surface delivery carries water to channels, tanks, sprinklers or drip. Each product has its own NB, wall or class and joint.

IS 4270:2001 governs steel water-well tubes. IS 12818:2010 governs uPVC screen and casing, with CS up to 80 m, CM to 250 m and CD to 450 m. IS 1239 governs the GI or MS field line. IS 4736 is a coating spec, not a pressure upgrade.

This page is not a drip-design manual and not a fire-hydrant spec. Hydraulic-cylinder and printing-cylinder shops should leave it. See IS 4270 casing and column pipes for the two products inside the well.

Who should buy farm irrigation pipe from Kanpur and who should not

Use this split for Kanpur Dehat, Unnao, Hardoi and Etawah-Auraiya farm wells and for JJM or PWD village sources that also feed a field line. Do not use it to buy boiler tube, hydrant main or precision cylinder stock.

Farm contractors collecting from the Kanpur steel market should state the casing and riser dimensions selected by the well and pump designs. Process-water wells likewise need separate RFQ lines for casing, column and any surface main, each with its own design basis.

Jal Jeevan Mission and PWD tender jobs still need a constructed source well. The mission page describes rural household tap connections and source sustainability. It does not pick casing OD or GI class for you.

Fire-system installers should stay on the fire-pipe pages. A hanging riser is not a buried hydrant main. Write casing, column and delivery as three RFQ lines so the yard cannot load one product for all three roles.

• For: farm irrigation bores and village source wells with a field line
• For: sugar-mill process-water wells that also feed a surface main
• Not for: IBR steam, fire hydrants or hydraulic-cylinder barrels
• Not for: a single "bore pipe" rate covering all three roles

Farm pipe roles and indicative Kanpur price bands

Casing and column are quoted by metre and class. Surface MS and GI are quoted from the site price lists in ₹/kg. MS ERW is ₹47-70 per kg. GI is ₹57-86 per kg. GST extra at the legally applicable GST rate stated on the current quotation. As-of date 2026-05-24 from src/lib/price-lists.js.

These bands are indicative, not a firm Kanpur proforma. Actual rate depends on quantity, mill and delivery PIN. IS 4270 casing does not have its own published ₹/kg band on this site, so that line stays on enquiry.

See the MS price list and the GI price list for the size rows. Do not treat GI as a thicker wall. Zinc is a coating. Pressure still follows the IS 1239 class.

How Kanpur farm buyers specify irrigation pipe

A Coolie Bazar or Kanpur Dehat crew should not write "pipe for 5 HP" and stop. Write casing NB and wall or CS/CM/CD, column NB and class and delivery NB and GI or MS. Attach field distance if the main is long.

Collect from the yard or ask for a truck to Lucknow (80 km, NH-27) or Unnao (18 km). City drops to Panki, Dada Nagar, Jajmau, Chakeri and Fazalganj are planned only when the written quotation confirms stock, vehicle and unloading window. See Kanpur borewell pipes and steel pipes in Kanpur.

State the steel MTC, uPVC class-marking and any Jal Nigam TPI requirements in the RFQ. The written quotation should confirm the offered documents and whether the requested inspection can be coordinated for that lot.

Which pipe belongs inside the bore and which pipe carries irrigation water?

Use casing to hold the bore open, column pipe to lift water from the submersible pump and delivery pipe to carry water across the field. Mixing these roles causes wrong sizing, weak joints, corrosion surprises and avoidable pump maintenance costs.

Farmers often use one phrase, "bore pipe", for three different products. IS 4270 steel casing lines the bore and protects the well structure. Column pipe hangs inside the casing and carries discharge from the submersible pump. Surface delivery pipe distributes water to channels, tanks, sprinklers or drip systems. Each product has different size, pressure and joint requirements.

The bore casing decision should follow drilled diameter, formation and depth. The column pipe decision should follow pump head, flow and suspended load. The delivery pipe decision should follow field layout, pressure loss, vehicle crossing and corrosion exposure. A cheap pipe in the wrong role creates repeated labour and crop-risk costs.

RP Sales RFQs for irrigation projects should therefore separate casing metres, column metres and surface delivery metres. That makes it possible to quote IS 4270, IS 12818, GI or MS correctly instead of averaging everything into one vague rate.

When is GI better than MS for agricultural irrigation pipes?

Do not choose GI or black MS from an agricultural label alone. The responsible designer should evaluate water and soil chemistry, environment, coating life, damage and repair, pressure, wall, joints, inspection, maintenance and whole-life cost.

Black steel and galvanised steel are distinct procurement options. Where zinc coating is selected, state the coating standard, repair procedure, inspection and compatibility with joints and service. Where black steel is selected, state the approved corrosion-protection and maintenance plan.

For borewell casing or surface irrigation, material selection must follow the approved service conditions and system design. A supplier should quote the specified option and any accepted alternative separately, without presenting location or exposure labels as a service-life guarantee.

Do not treat GI as a pressure upgrade. Pressure capacity still depends on base wall thickness, diameter, joints and standard. A thin GI pipe can corrode slower but still be mechanically weaker than a heavier MS pipe. Specify both coating and wall/class.

How should pump HP and field layout influence irrigation pipe size?

Pump nameplate power alone does not select pipe size. Use the approved hydraulic design based on the pump curve, required discharge and residual pressure, elevation, route length, fittings, valves, operating cases, transients and permitted velocity and head loss.

A farmer upgrading from flood irrigation to sprinklers or drip should recalculate pipe size. Sprinklers need pressure at the nozzle; drip systems need filtration and controlled pressure; flood channels may need high flow at lower pressure. The same borewell pump can behave differently after valves, bends and long field runs are added.

Column pipe sizing starts inside the well. If it is too small, friction reduces delivered head before water reaches the surface. Surface pipe adds more losses. Electricity cost accumulates every season, so a slightly larger delivery pipe can be economical on long runs. Conversely, oversizing short temporary pipes wastes capital.

Procurement should ask for pump HP, pump curve if available, bore depth, static water level, field distance, irrigation method and number of outlets running together. That information lets the supplier avoid a generic "same as last time" quote that may not match the new layout.

What documentation and checks matter for farm borewell pipe purchases?

Check standard, size, wall/class, thread or socket fit, coupling count, coating, length and certificates. For steel, request MTC and heat traceability; for uPVC, request class marking. Inspect ends before dispatch because rural rework delays irrigation work badly during season.

Apply the purchase order’s traceability and dimensional checks before dispatch. Verify the ordered coupling or socket quantity and record damaged threads, cracked sockets or nonconforming ends against the agreed inspection and disposition process.

For IS 4270 casing, ask for MTC and thread protection. For IS 12818/uPVC products, ask for class marking and batch declaration. For GI/MS surface pipe, confirm NB or OD, wall class, length and end finish. Keep the invoice description clear enough that future replacements can match the installed system.

Seasonal timing may affect availability, so put the required date and site sequence in the RFQ early enough to inspect, transport and resolve shortages. Ask the written quotation whether casing, column pipe and delivery pipe can be combined for the named site while keeping each specification and document set distinct.

How to write a farm irrigation RFQ from Kanpur

Split the bill into casing, column and delivery. State NB or OD, wall or class, length, ends, coating, pump head, field run, MTC or class mark and ex-warehouse Kanpur delivery. Attach the bore-log interval if screen is required.

Casing line: approved IS 4270 OD and duty or IS 12818 class, blank versus screen metres and connection. Column line: selected steel or uPVC dimensions, class or wall, connection and total metres. Delivery line: approved standard, NB or OD, wall or class, material, joint and run length.

Add Fe 410 or Fe 450 only if the steel specification names a grade and IS 4736 only when zinc is required. State the inspection-document type required by the purchase order rather than defaulting to 3.1. IBR forms do not apply. Name the PIN so freight can be quoted for the specific order.

Use the depth RFQ guide and column-pipe guide to collect inputs. Ask the written quotation to confirm whether the three distinct product lines can be delivered together; do not assume vehicle, stock or timing.

• Casing: NB/OD, wall or CS/CM/CD, blank versus slotted, ends
• Column: NB, class or wall, metres to pump setting, coupler type
• Delivery: IS 1239 NB and class, GI or MS, field run length
• Documents: MTC or class mark, TPI if named; no IBR Form III-A, III-B or III-C
• Commercial: ex-works Kanpur, GST at the legally applicable GST rate stated on the current quotation, delivery PIN

Worked example: 100 m of 80 NB medium MS delivery from Kanpur

The site formula gives 8.37 kg/m for 88.9 mm OD and 4.0 mm wall. One hundred metres weigh 0.837 MT of pipe body. That line is the field main, not the casing and not the riser.

This site states steel mass as weight = (OD − t) × t × 0.02466 kg/m. The pipe-weight table lists 80 NB medium as 88.9 mm OD and 4.0 mm wall, 8.37 kg/m. Check: (88.9 − 4.0) × 4.0 × 0.02466 = 84.9 × 4.0 × 0.02466 = 8.37 kg/m.

A 100 m Unnao field main is then 100 × 8.37 = 837 kg or 0.837 MT. At the MS band of ₹47-70 per kg that mass is an indicative envelope only. The proforma still needs the Kanpur rate on the day. GI on the same mass sits in the ₹57-86 per kg band.

Do not use 8.37 kg/m for 150 NB casing. That casing row on this site is 168.3 mm OD and 5.4 mm heavy-duty wall, a different product. Repeat the delivery-pipe check on the weight calculator before the PO.

Common farm-pipe mistakes around Kanpur

A farm RFQ is incomplete when it combines casing and delivery under one rate, applies a uPVC class outside its stated basis or treats galvanising as a wall class. Resolve product role, dimensions, standard, connection, protection and documents before ordering.

A 150 NB casing coupling will not join an 80 NB field main. Order the three roles with their own NB. A spoken "bore pipe" rate hides that mismatch until the truck is unloaded.

IS 12818 CS stops at 80 m. A 90 m Kanpur Dehat well that stays on uPVC casing is CM. Pump HP still does not pick the field-pipe class. Long sprinkler runs need friction checked, not a copy of last year’s 50 NB leftover.

Do not assume a universal GI price premium or infer wall class from coating. Specify IS 1239 Medium or Heavy and any IS 4736 coating requirement separately, then use the current written quotation for price. Reconcile coupling and socket counts with the PO and packing list before release.

Standards that belong on a farm irrigation purchase order

Cite IS 4270:2001 for steel casing. Cite IS 12818:2010 for uPVC casing or screen. Cite IS 1239 for GI or MS delivery. Cite IS 4736 only when zinc coating is required.

IS 4270:2001 covers casing, drive pipe and housing in Fe 410 and Fe 450. Hydrotest is calculated, capped at 7 MPa, held at least 3 seconds. Joints are screwed-and-socketed, screwed flush or plain bevelled.

IS 12818:2010 covers screen and casing from 35 mm to 400 mm. CS is up to 80 m, CM above 80 m to 250 m, CD above 250 m to 450 m. Steel metres need MTC. uPVC metres need class marks. IBR manufacture-and-test forms are not farm-well documents. Form III-A is for steam pipes, Form III-B for tubes and Form III-C for boiler mountings and fittings.

Jal Jeevan Mission source works still need a constructed well and a delivery line that matches the pump. Put the three roles on the Kanpur RFQ instead of a single irrigation-pipe heading.

Key points for an agricultural irrigation-pipe buyer

• Split the bill into casing, column and field delivery. They are three products.
• Use the casing dimensions selected by the approved well design; there is no universal Kanpur farm starting size.
• 80 NB medium MS delivery on this site is 8.37 kg/m; 100 m is 0.837 MT.
• MS bands are ₹47-70 per kg and GI bands are ₹57-86 per kg, GST extra at the legally applicable GST rate stated on the current quotation, as of 2026-05-24.
• Request an ex-warehouse Kanpur quotation and state the required MTC and heat-traceability scope. Confirm the offered document set before placing the order.