RDSO Approved Bridges

Kothari Chemicals (Engineering Division) is an RDSO approved girder fabricator based in Bhilai, Chhattisgarh. The RDSO registration, ID CBS/G/Reg/Kothari Chemicals, covers the fabrication of composite girders and other steel plate girders. It is held by the legal entity Kothari Chemicals. This page sets out the exact scope, how a buyer can verify it before award, and the documents we can supply with an enquiry.

Request a quote with your drawings and tender clauses.

What the RDSO registration covers

The scope is limited to what the registration lists: composite girders and other steel plate girders, including open-web, road-over-bridge and foot-over-bridge girders. Any other product must be checked against the tender and the registration record before it is offered as registered work.

The registered entity is Kothari Chemicals, the legal entity. Kothari Chemicals (Engineering Division) is the operating name used on this website. Offer documents should use the name shown on the vendor record.

How to verify the registration for a tender

1. Check the vendor entry on the Indian Railways IREPS portal under Approval of Vendors (UVAM).
2. Match the registered entity and the scope against the tender clause and the drawings.
3. Confirm the fabrication unit and the inspection stages named in the offer.
4. Record the tender number and the latest corrigendum, so the check can be repeated at award.

Our guide to verifying RDSO vendor registration for a girder tender sets out the comparison in more detail. The RDSO compliance dossier lists registration records, facilities and inspection capabilities.

Railway and bridge projects

These executed works come from our project record:

• MCVL-Handidua: 210 MT for four 36 m railway composite-girder spans, for Shree Balaji Engicons Ltd.
• NTPC Tamnar: 96 MT for two 24 m composite-girder spans to RDSO drawing, for Shree Balaji Engicons Pvt. Ltd.
• NTPC Lara: 250 MT for ten 30.5 m open-web girder spans, including rivets, for Shree Balaji Engicons Pvt. Ltd. Read the NTPC Lara case study.

The full list is on the projects page. A past project does not imply a current endorsement by the client, so ask for current references as part of any tender.

Capacity and handling

• Single-piece handling of up to 100 metric tonnes.
• Annual fabrication capacity of 18,000-20,000 metric tonnes per year.

These are maximum stated capabilities, not immediate slot availability. Production load, crane configuration, logistics and schedule are confirmed for each package. See our note on single-piece handling capacity.

Quality system and inspection

• ISO 9001:2015: certificate 305026010110Q from Quality Research Organization (QRO), dated 1 January 2026, with expiry on 31 December 2028. The certified scope covers manufacture of heavy building structures, technological structures, bridges and girders.
• In-house inspection: dimensional and visual checks, dye-penetrant testing (DPT) and magnetic-particle inspection (MPI).
• External NDT: radiography, UT and PAUT are arranged through qualified external support when specified. This includes NABL-accredited laboratories and AERB-approved radiography agencies.
• Surface protection: automatic shot blasting, a blast room, a paint booth and metalizing equipment. Preparation grade, coating system and dry-film thickness follow the project specification.
• Welding personnel: welders and welding inspectors hold BHEL Welding Research Institute certificates. Qualification validity is confirmed for each contract.

For the girder types and process steps, see girder bridge fabrication.

Related registrations

• Factory licence: 2106/2106/B-17/DRG/2m(I), issued by the Government of Chhattisgarh, valid to 31 December 2030 and renewed on 11 November 2025.
• MSME registration: Udyam number UDYAM-CG-05-0000352, classified as a small industry.
• SAIL ancillary status: the company lists ancillary unit status for Bhilai Steel Plant on its About page.

These are separate from the RDSO registration. Each one has its own scope and validity, so check each against the tender.

Documents you can request

Depending on the contract, we can supply:

• Material test certificates and plate traceability. See steel plate traceability and mill test certificates.
• WPS, PQR and welder qualification records. See WPS, PQR and welder qualification.
• Dimensional reports, NDT reports, calibration records and coating reports.
• Non-conformance closure, inspection release notes, packing lists and a manufacturing record book.

The document set is agreed in the contract before work starts.

Sending an enquiry

A useful enquiry includes the latest drawings and revision register, bill of quantities, steel grade, governing codes, welding and NDT scope, inspection agency, delivery location and target schedule. The RFQ checklist lists the full set.

Design responsibility is set package by package. Our standard workflow includes design and drawing review for manufacturability, but that does not make Kothari Chemicals the engineer of record. A committed programme follows review of the complete RFQ, because lead time depends on engineering release, steel availability, member complexity, welding and NDT, coating, inspection hold points and transport permissions.

Send your enquiry through the contact page, or call +91 788 2974 016 or email kcenggdiv@gmail.com.

Request a quote for RDSO approved girder work.

Frequently asked questions

Is Kothari Chemicals (Engineering Division) RDSO approved?

Yes. Registration ID CBS/G/Reg/Kothari Chemicals covers composite girders and other steel plate girders. The listed validity runs through 31 January 2031. Confirm the current status on the IREPS portal before award.

Which name should appear on a railway tender?

The registered entity is Kothari Chemicals. Check that the name in the offer matches the vendor record. Kothari Chemicals (Engineering Division) is the operating name.

Does every bridge need RDSO registration?

No. Indian Railway work commonly requires the applicable current RDSO registration and inspection process. Road and industrial bridges may be governed by other requirements. The owner, tender and governing specification decide. See RDSO registration requirements for steel bridge girder fabrication.

What is the largest single piece you can handle?

Up to 100 metric tonnes, as a stated maximum, using multiple 50 T cranes. Each lift is reviewed for geometry, centre of gravity, rigging, travel path and resource availability before it is committed.

How do I verify a registration before I award a tender?

Check the vendor entry on IREPS, then compare the registered entity, the scope and the proposed fabrication unit with the tender clause. The vendor registration guide covers each step.