Form IV Part C: Certificate of manufacture and test for tubes

What is Form IV Part C?

Form IV Part C of the Indian Boiler Regulations, 2026 is the certificate of manufacture and test for tubes, prescribed under regulation 11. Under the Indian Boiler Regulations, 1950 it was Form III-B (certificate of manufacture and test for tubes).

Who issues and signs Form IV Part C?

The tube maker and the Inspecting Authority. Well-known tube makers may issue it electronically with a digital signature.

What does Form IV Part C record?

• The part and quantity, drawing number, maker and customer
• The steel: process of manufacture, fully killed or rimmed, chemical composition, heat number, size, test certificate number and date, steel maker
• The tube: process of manufacture, main dimensions, tolerances, specification
• Tests: tensile strength, elongation, bend, flattening, crushing, flare and flange tests, heat treatment, hydraulic test in kg/cm² (g)

When is Form IV Part C filed, and with what?

Kept with the boiler's records by the Inspecting Authority, the owner and the manufacturer (regulation 308).

What changed for Form IV Part C from IBR 1950?

Under IBR 1950 this was Form III-B.

Related forms

• Form IV Part A: Constructor's certificate of manufacture and test (was Form III)
• Form IV Part B: Certificate of manufacture and test for pipes (was Form III-A)
• Form IV Part D: Certificate of manufacture and test of boiler mountings and fittings (was Form III-C)
• Form IV Part E: Certificate of manufacture and test of castings (was Form III-F)
• Form IV Part F: Certificate of manufacture and test of forgings (was Form III-G)
• Form IV Part G: Certificate of manufacture and test for headers, desuperheaters/attemperators, blowdown tanks, feed water tanks, accumulators and deaerators (was Form III-H)
• Form IV Part H: Certificate of manufacture and test for dished ends and end covers (was Form III-I)
• Form XXII: Certificate of manufacture and test for small industrial boilers (was Form XVII)
• Form XXIII: Certificate of manufacture and test for small solar boilers (was Form XVII)