About Pipe Fittings
Carbon steel, stainless steel, and alloy steel pipe fittings, buttweld (ASME B16.9) and forged (ASME B16.11), for process piping, industrial plants, and infrastructure projects. Elbows, tees, reducers, end caps, couplings, unions, and more.
Use this page as a product and specification reference. The quotation must state the exact material grade, dimensions, manufacturer, certification or document scope, inspection, quantity, price, current availability, freight, and proposed delivery timing for the specific RFQ.
Specification reference
| Type | Buttweld (ASME B16.9) and Forged (ASME B16.11) |
|---|---|
| Size Range | 1/2" to 48" (BW), 1/8" to 4" (forged) |
| Material Grades | ASTM A234 WPB (CS), ASTM A403 WP304/316 (SS), ASTM A234 WP11/WP22 (alloy) |
| Pressure Class | Sch 40, 80, 160, XXS (BW); 3000#, 6000#, 9000# (forged) |
| End Connection | Butt-weld beveled, socket-weld, or threaded (NPT/BSP) |
Confirm the exact grade, dimensions, tolerance, test certificate, and current availability for your requirement before ordering.
Common applications
These are enquiry contexts, not universal approvals. The project design and governing specification must approve the exact product, grade, dimensions, and service conditions.
- Oil & Gas: Pipeline connections, refinery process piping, gathering systems.
- Power Generation: Boiler feed piping, main steam lines, auxiliary systems.
- Chemical Processing: Reactor piping, acid lines, process distribution.
- Water & Infrastructure: Municipal water mains, sewage systems, fire protection.
Potential source references
The quotation must identify the proposed manufacturer, current availability, inspection documents, and delivery basis for the specific RFQ.
- Tube Trading Co.
- Kanak Metal
- Nandini Steel
- Dynamic Forge & Fittings
Applicable standards and specifications
Pipe fitting definition and governing standards
A fitting is a manufactured piping component selected to connect with a defined pipe specification. Elbows turn a run, tees create branches, reducers change size, and caps terminate an end. Couplings, unions, plugs, and bushings serve smaller socket-weld or threaded assemblies.
ASME B16.9 is the dimensional standard cited here for factory-made wrought buttwelding fittings. ASME B16.11 covers forged socket-weld and threaded fittings. Material specifications remain separate: ASTM A234 WPB is the listed carbon-steel route, ASTM A403 WP304 or WP316 covers listed stainless grades, and ASTM A234 WP11 or WP22 covers listed alloy options.
A fitting standard does not replace the piping class. The buyer still needs material grade, schedule or wall, pressure class where applicable, end connection, dimensions, and service requirements from the approved line list. A matching nominal size alone is not enough for acceptance.
Suitable buyers and cases that need engineering review
Process-piping contractors, water and infrastructure teams, fire-system installers, boiler auxiliaries, and plant-maintenance buyers use this product family. Kanpur fabricators also buy elbows, tees, reducers, caps, couplings, and unions for skids and utility headers assembled in Panki, Dada Nagar, Fazalganj, Jajmau, and Chakeri.
Buttweld fittings suit welded pipe runs where the piping specification calls for that joint. Forged socket-weld or threaded fittings suit smaller branch and instrument arrangements only when the class and connection method match the design. A threaded fitting should not be introduced into a welded line without engineering approval.
The catalogue is not a pressure-temperature design table. System design pressure, temperature, corrosion allowance, cyclic duty, fluid, welding procedure, and applicable code must come from the project engineer. IBR Form III-C should be requested only where the regulated boiler package and approved material route require it.
How Kanpur contractors write a fitting RFQ
Write one line for each fitting type. State elbow angle or radius description, tee type, reducer orientation, cap, coupling, union, plug, or bushing. Add nominal size, reducing size where relevant, schedule or exact wall, material grade, manufacturing standard, and end connection.
For buttweld items, match the fitting wall to the connecting pipe schedule and state the bevel requirement. For forged items, write socket-weld or threaded, pressure class, thread form, and material. Do not use a single ditto mark across different line classes because reducers and branch items can cross size or schedule boundaries.
Request the MTC, heat or batch traceability, dimensional inspection, markings, and any NDE required by the project specification. Add TPI hold points before packing when the tender names an inspection agency. If fittings form part of an IBR package, put the required Form III-C scope and approved source requirement on the enquiry.
Commercial fields should show quantity by piece, packaging, ex-warehouse Kanpur rate, applicable taxes, freight, unloading responsibility, and delivery PIN code. Ask suppliers to identify exclusions such as companion flanges, gaskets, fasteners, welding, or coating rather than assuming they accompany the fitting.
- Type and geometry: elbow, tee, reducer, cap, coupling, union, plug, or bushing.
- Connection: buttweld, socket-weld, or threaded, with the required bevel or thread form.
- Material: ASTM grade, size, schedule or wall, pressure class, and project line class.
- Documents: MTC 3.1, marking, dimensional report, TPI, NDE, and IBR Form III-C when applicable.
- Delivery: pieces, packing, ex-warehouse Kanpur basis, GST, freight, and site PIN code.
Buttweld and forged fitting comparison for Kanpur buyers
The comparison keeps connection method and commercial unit visible. Buyers should issue separate quotation lines for each size, grade, schedule, and fitting geometry so one blended piece rate cannot hide a mismatch.
| Fitting family | Size range | Wall or class basis | End connection | Core PO fields |
|---|---|---|---|---|
| Buttweld elbow, tee, reducer, cap | 1/2-48 in | Sch 40, 80, 160, or XXS | Butt-weld beveled | ASME B16.9, ASTM grade, size, schedule, geometry, and MTC |
| Forged socket-weld fitting | 1/8-4 in | 3000#, 6000#, or 9000# | Socket weld | ASME B16.11, ASTM grade, size, class, socket details, and MTC |
| Forged threaded fitting | 1/8-4 in | 3000#, 6000#, or 9000# | Threaded NPT or BSP | ASME B16.11, ASTM grade, size, class, thread form, and MTC |
| Reducing fitting | Within listed family range | Match each connecting pipe | As line class requires | Large end, small end, schedule at each end, eccentric or concentric form |
The project piping class, approved drawings, ordered standard edition, and inspection documents remain the acceptance basis.
Worked example for matching fitting and pipe wall
Consider a 2 inch Sch 40 parent pipe already tabulated on the site at 60.3 mm OD and 3.91 mm wall. Its theoretical weight is (60.3 - 3.91) x 3.91 x 0.02466 = 5.44 kg/m.
Using the displayed 5.44 kg/m value, a 6 m pipe length has a theoretical mass of 32.64 kg. This figure helps the buyer check the parent-pipe BOQ and freight estimate. It is not the fitting weight. The elbow, tee, reducer, or cap must be quoted by its own piece description and verified against the manufacturer data.
The procurement lesson is simple: write 2 inch, Sch 40, material grade, standard, and fitting geometry together. If the adjoining pipe changes to Sch 80, revise the fitting line rather than leaving the earlier wall description in place. Keep every transition visible on the isometric and material take-off.
Inspection points and common fitting failures
In practice, mixed schedules and incomplete markings create avoidable site holds. Compare each fitting with the PO, packing list, MTC, and relevant pipe line before releasing it to fabrication. Check fitting type, angle, branch size, end size, grade, schedule or class, and heat or batch reference.
Inspect buttweld ends for bevel condition, wall transition, dents, corrosion, and damage that affects fit-up. Check reducers for concentric or eccentric orientation. For socket-weld and threaded parts, inspect socket condition, thread form, protectors, and visible damage. Do not repair or re-machine a nonconforming fitting without an approved disposition.
Buttweld fitting dimensions and wall requirements must be coordinated with the connecting pipe and the ordered edition of ASME B16.9. Put the project tolerance and any matching or machining requirement on the PO. A supplier statement that a fitting is standard does not identify which pipe schedule or material line it matches.
Count pieces by marked line item before storing them. Separate carbon, stainless, and alloy grades to reduce accidental mixing. Preserve markings through blasting or coating by transferring identification under the project procedure. Quarantine any item whose marking cannot be reconciled with its certificate.
Kanpur dispatch basis for fittings and matching pipe
When a project needs fittings with matching pipe, flanges or valves, place every component on a separate RFQ line. A useful Kanpur comparison keeps material basis, applicable taxes, packing, freight, and unloading separate. Piece count and weight basis should both appear where freight or handling depends on them.
Buyers in Lucknow, Agra, Prayagraj, Varanasi, Gorakhpur, Jhansi, Bareilly, and Patna can use the matching city pages for enquiry context only. Require the quotation to confirm whether the destination can be served and the proposed timing; the site makes no standing regional dispatch commitment.
PWD and JJM contractors should send the BOQ, approved make conditions, inspection clauses, and delivery schedule. Sugar mills and fire-system installers should include line service and documentation requirements. A complete enquiry lets the quotation pair each fitting with the correct pipe and certificate packet.
Key points for fitting procurement
- Write fitting geometry, size, schedule or class, connection, material grade, and standard together.
- Match buttweld wall to the connecting pipe and forged class to the approved piping specification.
- Keep carbon, stainless, and alloy items identified and physically separated.
- Verify markings, dimensions, ends, MTC, inspection, and piece count before fabrication.
- Separate material, GST, packing, freight, unloading, and excluded companion items in the quote.
What to include in the RFQ
- Specify the relevant standard or grade where known.
- Provide OD or NB, wall thickness or schedule, required length, and quantity.
- State the delivery city or PIN code and any unloading constraints.
- List MTC, IBR, TPI, marking, inspection, or other documentation requirements.