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  Reg. 366 C, Reg. 366 D

Branches

1)

Where branches or saddles are secured to the shell by riveting or by studs, the minimum thickness of the flange adjoining the shell shall be in accordance with the following table:-

TABLE

Thickness of shell plate Inch Minimum thickness of flange Inch
3/8 to 3/4 1/2
above 3/4 to 1 5/8
above 1 to 2 3/4
above 2 1

The actual dimensions of the flanges shall be governed by the requirements of compensation for the opening.

The dimensions of flanges of branches remote from the shell for ordinary bolted joints and those of bolts of all pads and saddles shall be in accordance with the appropriate table given in Appendix E for the working pressure and temperature corresponding to the design pressure and temperature of the shell. The dimensions of the flanges for special joints shall be subject to approval of the Chief Inspector of Boilers concerned.

The working pressure for the body of the branch shall be determined by the equation as given in sub-regulation (a) above, subject to the requirements of compensation for the opening.

Notwithstanding the result obtained from the equation the minimum thickness of the body of the branches shall be such that in no case does the total stress, resulting from the combination of the stress due to internal pressure and to all externally applied load, exceed the permissible stress corresponding to the design temperature. The method of calculating the total stress shall be subject to the approval of the Chief Inspector of Boilers concerned. Where the magnitude of the externally applied load cannot be determined, the minimum thickness of the body of the branch shall be as given in the following table:-

Minimum thickness of Branches Where External Loads Are Not Known

Nominal bore of branch Thickness of cylindrical part of shell Minimum body thickness
In. In. In. In.
Upto and including 2 ½
Over 2 ½ upto and including 4 ¼
3/4 and above
7/8 and above
3/8
7/16
For thinner shells not less than one half the thickness of the cylindrical part of the shell.
Over 4 ¼ upto and including 8
Over 8 upto and including 10
1 and above
1 ¼ and above
1/2
5/8
Over 10 1 ¼ and above   Subject to approval of the Chief Inspector of Boilers concerned.


Reg. 366 D

Inspection during construction

All parts of steam receivers, separators catch waters and similar vessels shall be inspected at all appropriate stages of construction detailed in Appendix J of the Indian Boiler Regulations.
 
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