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Reg. 341

Headers Irregular in Form

a) In cases where the headers are of such irregular form as to render impracticable the application of a formula for the determination of thickness, the manufacturer shall show the suitability of the headers for the working conditions by indicating practically the maximum internal hydraulic pressure which a header, made to the same design and of similar material, will withstand without permanent deformation. The maximum working pressure for similar headers may then be determined by the following formulae:-

W. P. = P1 x Permissible stress at working metal temperature Eqn.(90)

F x C

 

where,

W. P. = The working pressure in lbs. Per sq. In.
P1 = The maximum internal hydraulic pressure withstood without, permanent deformation.
F = 1.75 for wrought steel and 2 for cast steel.
C = 15500 for wrought steel of 24 tons per sq. in minimum ultimate tensile stress.
= 16500 for wrought steel of 26 tons per sq. in minimum ultimate tensile stress.
= 18000 for wrought steel of 28 tons per sq. in minimum ultimate tensile stress.
= 21000 for wrought steel of 32 tons per sq. in minimum ultimate tensile stress.
= 22000 for wrought steel of 34 tons per sq. in minimum ultimate tensile stress.
= 15500 for wrought steel of 28 tons per sq. in minimum ultimate tensile stress.

 
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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
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