IS 1239 Part 1 covers welded and seamless steel tubes for water, non-hazardous gas, air, and steam in the stated scope. The BIS preview covers 6 mm to 150 mm NB. Site class language is light, medium, or heavy. Kanpur buyers should specify NB, class, finish, end condition, hydrotest, MTC, BIS traceability, and any project-specific material requirement, then compare rates on an ex-warehouse Kanpur basis with GST extra at the legally applicable GST rate stated on the current quotation.
What does IS 1239 cover for ERW steel pipe buyers?
IS 1239 Part 1 covers welded and seamless steel tubes for water, non-hazardous gas, air, and steam within its stated scope. It defines nominal bores, dimensional classes, tests, finish options, and marking expectations. It is not by itself an IBR approval route.
For Indian procurement, IS 1239 is familiar language for commodity steel tube in its stated service and size scope. A quotation should not stop at “ISI pipe”. State IS 1239 Part 1, nominal bore, light/medium/heavy class, black or galvanized finish, end condition, quantity, and any separately required material input or project grade. That prevents thin-wall commercial stock from being compared with certified medium class.
BIS licensing, mill origin, heat or batch traceability, and the ordered inspection documents matter to acceptance. Ask the quotation to identify the mill, licence source, certificate type, and test records available for the lot rather than assuming every stock bundle carries the same document set.
Use the standard citation visibly in the purchase order. We cite IS 1239 Part 1:2004 because it anchors the class and test language. If the pipe is outside its size range or needs higher pressure, move to IS 3589, ASTM A53, or seamless standards rather than stretching IS 1239 beyond its intent.
The BIS preview of IS 1239 : Part 1 : 2004 states clause 1.1 covers welded and seamless plain-end or screwed-and-socketed tubes for water, non-hazardous gas, air, and steam, from 6 mm NB to 150 mm NB. Clause 1.2 recommends medium and heavy tubes only for steam, with Annex A pressures given for guidance. That steam note is not an IBR pressure-part approval. If IBR applies, the approved drawing and current forms schedule control the material and certificate: Form III-A is for steam pipes, Form III-B for tubes, and Form III-C for boiler mountings and fittings.
Who should buy IS 1239 pipe in Kanpur, and who should not
Buy IS 1239 for water, non-hazardous gas, air, or permitted steam duty around Kanpur when the approved BOQ names that standard. Do not infer sewage, structural, IBR pressure-part, high-temperature, hydraulic-barrel, or printing-cylinder suitability from the BIS preview alone.
PWD, Jal Nigam, JJM, fire, pump-house, and utility buyers around Kanpur should copy the approved standard, size, class, material, coating, and inspection requirements into the RFQ. No project label makes Medium, Heavy, GI, black, or an IS 1239 size band the default.
Do not stretch the standard into boiler steam service. IBR pressure parts need the material and inspection route on the approved drawing. The current forms schedule distinguishes Form III-A for steam pipes, Form III-B for tubes, and Form III-C for boiler mountings and fittings. Hydraulic shops need honed or CDW bore condition that IS 1239 does not define. Printing-cylinder shops need dimensional precision outside this commodity tube. Borewell casing belongs on IS 4270, not on a water-tube class.
Use the MS ERW Kanpur, Kanpur steel pipes, and GI pipes Kanpur pages as enquiry context only. Require the current quotation to confirm stock, offered basis, GST, freight, destination, and material location; this page makes no standing commercial promise.
Which IS 1239 class and material details should procurement specify?
Choose Light, Medium, or Heavy class from the approved drawing or BOQ. Those classes control the dimensional wall system. IS 1239 does not create a finished-tube YST 210/240/310 menu; record any separate project material requirement exactly as specified.
Light, Medium, and Heavy are the finished-tube dimensional classes used for the order. The BIS product manual lists permitted steel input under IS 10748 or IS 513 Part 1; it does not turn IS 1161 YST 210, YST 240, or YST 310 into the normal grade menu for finished IS 1239 tube. Do not add a YST grade unless a separate project specification expressly requires a compatible material designation.
A clean RFQ can read “IS 1239 Part 1, Medium class, 50 NB, black, plain end, 6 m lengths,” followed by the required mill certificate and project-specific material line. If the project separately names a strength grade or input-steel specification, reproduce that wording without presenting it as an IS 1239 grade choice.
Light, Medium, and Heavy are product classes, not application defaults. Copy the class selected by the approved design after its pressure, temperature, corrosion, joint, support, handling, installation, and test checks; do not infer a class from “normal water,” criticality, or site handling.
If offers differ materially, compare standard, class, dimensions, theoretical and offered mass, certification, markings, source, quantity, and commercial basis. Do not infer lighter or uncertified material from price alone; investigate the actual offer before issuing the PO.
IS 1239 class wall and mass at 50 NB
At 50 NB the site class chart uses OD 60.3 mm. Light wall is 2.9 mm, medium 3.6 mm, heavy 4.5 mm. Theoretical mass is 4.10, 5.03, and 6.19 kg/m. Compare quotes on kilograms, not only on rupees per length.
Class is wall thickness, not a strength grade. The table below reuses the site class-thickness chart and the generated weight table. As-of date is 2026-05-06 for those source files. Indicative MS ERW price bands on the price list last edited 24 May 2026 are ₹47-70 per kg ex-warehouse Kanpur for 15-150 NB. That dated list shows GST 18% extra as a budgeting example, not a locked current tax rate.
A 100-length lot of 50 NB medium in 6 m pieces is 3.02 MT on the theoretical table (30.2 kg × 100). The 50 NB medium band on the MS ERW price list is ₹53-60 per kg. Material value on that band is about ₹1.60 lakh to ₹1.81 lakh before GST and freight. Check the arithmetic against the weighbridge slip before you accept a cheaper per-metre offer.
Read the full NB list on the IS 1239 class thickness chart and the pipe weight chart. Do not convert class to Schedule 40 by name. Compare wall in millimetres.
Important source conflict: the linked IS 1239 standard guide currently shows 2.90 mm for 50 NB Medium, while the class thickness chart and weight table used here show 3.6 mm and 5.03 kg/m. This page’s worked mass uses 3.6 mm. Do not release the PO from either website value alone; reconcile the purchased BIS edition, tender, mill table, and offered MTC.
| Class | OD (mm) | Wall (mm) | Mass (kg/m) | Mass (kg per 6 m) |
|---|---|---|---|---|
| Light (A) | 60.3 | 2.9 | 4.10 | 24.6 |
| Medium (B) | 60.3 | 3.6 | 5.03 | 30.2 |
| Heavy (C) | 60.3 | 4.5 | 6.19 | 37.1 |
Is IS 1239 suitable for galvanized, threaded, and coupled supply?
Specify black, galvanised, plain, threaded, coupled, bevelled, or another finish only where the approved design and product standard permit it. State coating, connection, dimensions, components, inspection, and documents explicitly.
The approved corrosion design should select coating from the actual material, environment, service, preparation, inspection, maintenance, and life requirements. Coating does not substitute for the base wall and pressure design.
The approved joining design should select the end form and define threads, couplings, bevels, preparation, components, protection, gauges, welding, and inspection. Do not map outdoor, indoor, plumbing, fencing, pump-house, welding, or fabrication labels to a finish.
For corrosion-sensitive projects, ask whether galvanizing is done after threading and whether threads are passivated or protected. Inspect random couplings before dispatch and keep the invoice description precise so future replacements match the installed lot.
How Kanpur contractors should specify IS 1239 in an RFQ
State IS 1239 Part 1, NB, class, finish, end condition, length, quantity, MTC requirement, inspection, packing, delivery basis, and any separate project material requirement. Hold GST at the legally applicable GST rate stated on the current quotation and freight as separate lines on an ex-warehouse Kanpur quote.
Open the RFQ with the project or tender reference, service, and the exact standard. Then write NB and class as Light, Medium, or Heavy. Add black or hot-dip galvanized finish, plain end, bevel end, or threaded and coupled, and the ordered length. Add a material grade only when a separate project specification names it, and copy that designation exactly.
Name the documents before you ask for a rate. Require the MTC, hydrotest record, BIS licence source, and traceability needed by the project, then confirm that the offered stock can supply them. Add TPI only when the tender or quality plan names the inspection scope and agency. Commodity IS 1239 utility tube is not automatically within an IBR certificate route.
Close with quantity in metres and MT, packing, marking, unloading constraint, and destination PIN. State ex-works Kanpur or delivered site. A clean comparison holds class, grade, finish, length, documents, GST, and freight constant. Send the line through the RFQ form.
- Standard: IS 1239 Part 1 with Light, Medium, or Heavy class written in full; add only a separately specified project material grade.
- Dimensions: NB, OD if fitment matters, wall in mm, length, end finish, quantity in m and MT.
- Finish: black or hot-dip galvanized, with IS 4736 called when zinc mass is in the BOQ.
- Documents: inspection-document type, heat marking, test evidence, BIS source, and TPI scope as named by the PO.
- Commercials: ex-warehouse Kanpur, GST extra at the legally applicable GST rate stated on the current quotation, freight, and destination PIN.
Worked quantity check for a 50 NB medium Kanpur order
Use kg/m = (OD − t) × t × 0.02466 with millimetres. For 50 NB medium, OD 60.3 mm and wall 3.6 mm give 5.03 kg/m, or 30.2 kg per 6 m length on the site weight table.
The formula is the site steel-pipe rule: weight in kg/m = (OD − wall) × wall × 0.02466. Plug in 60.3 and 3.6. (60.3 − 3.6) × 3.6 × 0.02466 = 5.03 kg/m. That matches the generated weight table. One 6 m length is 30.2 kg on that table.
A 100-length requirement is 3.02 MT before mill tolerance, zinc, couplings, or packing. If the supplier quotes 2.4 MT for the same 100 lengths, the wall is likely Light class (24.6 kg per 6 m, 2.46 MT) or mixed stock. Do not issue the PO until class, wall, and theoretical mass agree.
This check does not set working pressure. The designer owns class selection. Procurement uses the mass to test the quotation and the weighbridge slip. Keep OD and wall on the PO. Run the same steps in the steel pipe weight calculator.
What documents should an IS 1239 supplier provide with dispatch?
Ask for the GST invoice, packing list, mill test certificate, heat or batch traceability, dimensional declaration, hydrotest confirmation, and BIS source details required by the PO. For tenders, add the specified third-party inspection. Refuse vague “ISI quality” claims without a standard, class, and documented origin.
A proper IS 1239 receipt should be auditable after unloading. The ordered MTC should map to heat or batch markings and the required material, dimensional, and test evidence. The packing list should match piece count, length, and bundle weight. If the project requires independent pre-dispatch inspection, name the approval process or agency, scope, hold points, location, and release evidence in the RFQ; the written quotation must confirm whether it can be coordinated.
Documentation also protects the buyer from substitution. If the PO says IS 1239 Medium but the MTC or invoice says only commercial ERW pipe, hold the material before installation. If a separate project grade was ordered, that designation must also reconcile. Once pipe is cut, threaded onsite, or welded into a line, evidence becomes harder to prove.
IBR documentation follows the approved product form and manufacturing-inspection route. Do not accept a promise to create statutory evidence after supply, and do not infer seamless or another construction from this page; copy the governing design and authority requirements at quotation stage.
What Kanpur receiving teams miss on IS 1239 lots
Receiving should verify every acceptance field required by the PO, including identification, documents, dimensions, class, condition, and quantity. This page does not claim which defect category causes most rejections.
Do not predict a defect from price. Apply the PO inspection plan to wall, OD, length, end condition, ovality, markings, packing list, and inspection documents, and record any nonconformity for disposition. Do not use a colour band alone as acceptance evidence.
Weigh the bundle and compare it with theoretical mass plus a mill-tolerance allowance. A 100-length “medium” bundle that weighs like Light class needs an explanation before unloading acceptance. Once pipe is cut, threaded, or painted, the supplier can argue the lot was accepted.
Galvanized lots need a zinc check against the BOQ, including IS 4736 when the tender names it. Threaded lots need coupling count and thread protection. Keep the receiving note with the truck documents. The quality, MTC, and TPI guide sets the broader document sequence.
Which standards govern an IS 1239 purchase
The governing product standard is IS 1239 Part 1:2004, with Light, Medium, and Heavy dimensional classes. Do not import the IS 1161 YST 210/240/310 grade menu into an IS 1239 RFQ. Galvanizing, when ordered, follows the specified IS 4736 requirement. Any IBR certificate must follow the actual product form and current statutory documents.
Cite IS 1239 Part 1 on the PO, not a trade nickname. The BIS preview (fetched 2026-09-03) gives the 6-150 mm NB scope. Light, medium, and heavy class language on this site is the wall system used in the class chart and price list. Confirm any offered size and availability on the written quotation. For larger water-pipe requirements, use the approved design and product standard rather than extending this range.
Finish, ends, and tests stay on the same PO line. State black or galvanized, plain or threaded, test evidence, and the required inspection-document type. ASTM A53 Type E is a different designation family; any substitution needs formal technical approval, not only an OD-and-wall comparison.
Steam boiler pressure parts stay on the IBR route. The current forms schedule identifies Form III-A for steam pipes, Form III-B for tubes, and Form III-C for boiler mountings and fittings. When a drawing names SA192, SA210, SA213, or ASTM A106, use its exact product form, approved material line, inspecting-authority requirements, and applicable current certificate rather than attaching an IS 1239 MTC.
Dispatch from Kanpur for IS 1239 orders
An IS 1239 RFQ can request an ex-warehouse Kanpur basis, but the written quotation must confirm whether RP Sales can offer the material, stock status, GST, documents, destination, vehicle basis, and timing for that order.
Panki, Dada Nagar, Jajmau, Coolie Bazar, Unnao, and Kanpur Dehat can be planned from the Kanpur yard, but loading time is not guaranteed by distance. Confirm the exact size, class, quantity, stock status, document availability, vehicle, and unloading window before promising a dispatch slot.
For Lucknow, Prayagraj, Varanasi, Gorakhpur, Bareilly, Patna, or another destination, obtain a carrier transit commitment for the actual vehicle and route. Road distance is a planning input, not a next-day or second-working-day guarantee.
If a mixed-size or mixed-mill load is proposed, confirm the carrier, bundle segregation, packing list, and document pack before allocation. Require the MTC form agreed on the PO; do not assume an original certificate automatically accompanies every stock lot. TPI is arranged only when its scope, agency, timing, and availability are confirmed.
Key points for buying IS 1239 from Kanpur
Keep these five checks on the enquiry and the PO. They repeat facts already stated above; they do not add new figures.
- Order IS 1239 Part 1 by NB and Light, Medium, or Heavy class, not by “ISI pipe” or an imported YST menu.
- Compare theoretical kg/m before you compare rupees per length.
- Use this standard for water, gas, and utility duty, not for IBR steam parts.
- Hold GST extra at the legally applicable GST rate stated on the current quotation and freight separate on an ex-warehouse Kanpur basis.
- Match MTC heat, wall, marking, and bundle mass before cutting.