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Reg. 49 B
MATERIALS OF CONSTRUCTION

SEAMLESS FERRITIC AND AUSTENITIC ALLOY STEEL BOILER, SUPERHEATER AND HEAT EXCHANGER TUBES

Flattening Test

A section of the tube not less than 63 mm in length shall be flattened cold between two parallel flat surfaces to a distance between the plates (H) as calculated by the formula given below, without showing any sign of a crack of flaw.

            (1 + e)t

                H = -----------

             e + t/D

where    t = specified thickness of tube (mm)

            D = specified outside diameter of the tube (mm)

            e = a constant, as given below

            e = 0.08 for ferritic alloy steel

            e = 0.09 for austenitic steel

 
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Message from Chairman of Central Boilers Board About Central Boiler Board History of Indian Boiler Regulations Foreword Contents Chapter Wise Contents Regulation Wise List of Amendments
Indian Boilers Act 1923 Ibr Forms Home Search Help Contact Us