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Reg. 391

Calculation of Wasted Shell

a) When any part is wasted and the Inspector is doubtful of its fitness for the pressure, he shall cause one or more small holes to be bored and from them ascertain the average thickness of the parts from which he can satisfy himself by calculation in accordance with the formula applicable to the part. Such gaugings and calculations he shall enter in the Memorandum of Inspection Book.
b) In making calculations for a wasted part of a boiler shell, e.g., along the line of seating blocks of a Lancashire boiler, the Inspector shall use the following formula:-

W. P. = 2 t X S Equation (96)
D X F

Where,

t = thickness of wasted plate, where thinnest.
S = minimum tensile strength of material of shell in lbs. per sq. in.
D = internal diameter of shell in inches.
F = factor of safety, which shall not be less than 4.
 
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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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