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Reg. 187
SHELLS


Uncompensated holes in Water Tube Boilers

The maximum diameter of any unreinforced opening shall not exceed 'd' as shown in Figures 9B and 9C subject to a maximum of 203 millimetres.

The notations are as follows :


  K =    P x D  Eqn. 20
  1.82 fe


where,-

P = working pressure;

d = maximum allowable diameter of opening (in the case of an

opening of elliptical or round form, the mean value of the

two axes of the opening shall be taken for d);

D = outer diameter of the shell;

e = actual thickness of the shell;

f = allowable stress;

When K has a value of unity or greater, the maximum size of an unreinforced opening should be 51 millimetres (2 inches).

 
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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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