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Reg. 39
MATERIALS OF CONSTRUCTION

COLD DRAWN SEAMLESS CAR BON STEEL BOILER, SUPERHEATER AND HEAT EXCHANGER TUBES FOR DESIGN METAL TEMPERATURES NOT EXCEEDING 454°C (850°F).

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 or 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 = 0.07 for Carbon steel with maximum specified carbon 0.19% or greater

e = 0.09 for Carbon steel with  maximum specified carbon 0.18% or less

 
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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