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Reg. 274, Reg. 275

Intermediate Boiler Drum Supports

Where a boiler drum is supported at intermediate points in its length at a distance greater than one internal diameter from the end of the parallel portion of the drum shell, the shell shall be thickened locally to the support or so designed that when the local stress set up by the supports in the drum shell are added, algebraically to those caused by the internal steam pressure and supported loads, the maximum resultant stress does not exceed the permissible working stress at the working metal temperature.


Reg. 275
END PLATES

Shape of Dished End Plate


When the end plate is dished to semi ellipsodial, partial-spherical or hemispherical form, it shall comply with the following (see Figure 23A, 23B, 23C)

a)  hemispherical heads without limitation;
b) elliptical heads sufficiently dished so that H 0.2 D;
c) partial spherical heads satisfying all the following requirements:

r 0.1 D
r 3 T
R   D
0.18D

A value of R< 1.2 D is permitted for ends in which the ratio H/D falls between 0.18 - 0.2.

In accordance with Figs. 23A, 23B, 23C, 23D, 23E, 23F.

D = outside diameter of the head;
H = height of the head measured on its outside surface from the junction of the dished part with the cylindrical shell;
R = inside radius of the spherical part of partial spherical heads;
r = inside knuckle radius of partial spherical heads.

 
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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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