GuideIBR 1950 → IBR 2026

IBR Certificate Forms — Form III-A, III-C and More

Which IBR certificate goes with which product — Form III-A for steam pipes, Form III-C for flanges and fittings, Form III-F for castings, Form III-G for forgings and Form IV / IV-A for steel — and how the 2026 Regulations change the picture.

Request an IBR quote info@teshigroup.comIBR approved · ISO 9001:2015 · since 1971

IBR certificate forms at a glance

Certificate (IBR 1950 name)	What it certifies	Used for
Form III-A	Certificate of manufacture and test of steam pipes	IBR pipes
Form III-B	Certificate of manufacture and test of tubes, signed by the Inspecting Authority or a Well-known Tube Maker	Boiler tubes
Form III-C	Certificate of manufacture and test of boiler mountings and fittings — the certificate buyers ask for with IBR flanges, fittings and valves	IBR flanges and fittings
Form III-F	Certificate of manufacture and test of castings, by the Inspecting Authority or a Well-known Foundry	Cast valve bodies
Form III-G	Certificate of manufacture and test of forgings, by the Inspecting Authority or a Well-known Forge	Forgings
Form IV	Steel maker's certificate of manufacture and test (Well-known Steel Maker)	Raw material
Form IV-A	Certificate of material tested by the Inspecting Authority where the maker's certificate is not available	Raw material

The Indian Boiler Regulations, 2026 consolidate these certificates under a renumbered set of forms. Until your boiler inspectorate confirms the form required on a specific job, buyers and inspectors still refer to the 1950 names — Form III-A for pipes and Form III-C for flanges and fittings — and Teshi Group issues the certificate in the form prescribed at the time of supply.

IBR in 2026: the current rules

Act	The Boilers Act, 2025 (Act No. 12 of 2025) — in force from 1 May 2025; it repealed the Indian Boilers Act, 1923
Regulations	Indian Boiler Regulations, 2026 — published in the Gazette of India on 1 October 2026, replacing the Indian Boiler Regulations, 1950
Regulator	Central Boilers Board (Ministry of Commerce & Industry, DPIIT); Technical Adviser (Boilers) is its Member-Secretary
Scope	“Boiler components” include steam piping, feed piping and any mounting or fitting subject to pressure above 1 kg/cm² gauge
Inspection	Inspecting Authority — the state boiler directorate (in West Bengal, the Directorate of Boilers) or a body recognised by the Central Boilers Board
International codes	Materials and designs to ASME, BS, EN, DIN and JIS can be accepted under the regulations, certified through the Inspecting Authority

Who needs IBR material

Any pipe, flange, fitting or valve in a boiler, steam pipe or feed pipe within the scope of the Boilers Act, 2025 must be made from acceptable material and supplied with a certificate of manufacture and test endorsed by an Inspecting Authority. That covers power plants, captive and cogeneration plants, sugar, paper, textile, food, chemical and refinery steam systems across India.

Lines outside that scope — utility water, air or low-pressure services — usually do not need IBR certification. Your plant's boiler inspectorate decides the boundary.

What a Form III-C certificate records

Maker's name and works
Description, size and rating of each fitting or flange
Material specification and grade
Heat / cast number and identification marks
Chemical analysis and mechanical test results
Hydrostatic or other tests where required
Signature of the maker and countersignature of the Inspecting Authority

Who can sign IBR certificates

An Inspecting Authority — a state boiler directorate or a body recognised by the Central Boilers Board — verifies manufacture and tests and countersigns the certificate. Makers recognised by the Board as a Well-known Steel Maker, Tube Maker, Foundry or Forge can certify their own material on the relevant form; other makers' products are certified through the Inspecting Authority.

How Teshi Group makes and certifies IBR material

Step 1

Order review

Confirm IBR applicability, design pressure and temperature, material grade, size, rating and the Inspecting Authority named in the order.

Step 2

IBR-acceptable raw material

Forging bar, billets, plate or pipe bought with mill certificates acceptable under IBR (Well-known Steel Maker or Inspecting Authority-tested material), recorded by heat number.

Step 3

Manufacture

Forging, heat treatment and machining to ASME B16.5, B16.47, B16.9 or B16.11, with the heat number transferred to every piece.

Step 4

Inspection and testing

Chemical and mechanical tests, hardness, dimensional inspection and NDT as required, witnessed and verified by the Inspecting Authority.

Step 5

Stamping and certificate

Each piece is hard-stamped and the IBR certificate of manufacture and test is signed by Teshi Group and countersigned by the Inspecting Authority.

Step 6

Dispatch

Material ships with the IBR certificate, EN 10204 3.1 mill test certificates and the dimensional report, traceable piece by piece.

FAQ

IBR Certificate Forms: common questions

What is Form III-C in IBR?

Under the Indian Boiler Regulations, 1950, Form III-C is the certificate of manufacture and test of boiler mountings and fittings — the certificate supplied with IBR flanges, fittings and valves.

What is Form III-A?

The IBR certificate of manufacture and test for steam pipes.

Are Forms III-D and III-E still used?

No. Forms III-D and III-E were deleted from the 1950 Regulations; some websites still mention them.

Did the forms change with IBR 2026?

The Indian Boiler Regulations, 2026 renumber and consolidate the certificate forms. Buyers and inspectors still use the 1950 names; the certificate is issued in the form prescribed at the time of supply.

What is Form IV-A?

A certificate of material tested by the Inspecting Authority where the original steel maker's certificate is not available.

IBR products and resources

OEM manufacturer

Ready to build to spec?

Share your drawing, bill of materials or technical requirements with the Teshi team.

Request a quote Download catalogue (PDF)