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Reg. 410, Reg. 411, Reg. 412
RIVETED STEEL BOILERS

Flange-Thickness and Drilling

The thickness and drilling of flanges of standpipes shall be in accordance with the Appendix (E).



Reg. 411
RIVETED STEEL BOILERS

Pads

These shall comply with Regulation 155.




Reg. 412
RIVETED STEEL BOILERS

Unstayed Flat-End Plates

The working pressure of unstayed flat-end plates shall be determined by the following formula:

W.P. = 2S(t-2)² Eqn. (98)

Where,

t = thickness of plate in thirty-seconds of an inch.
W.P. = Working pressure in pounds per square inch.
D = Diameter in inches of the pitch circle of the bolts or rivets when the plate is attached to an outside flange or the internal diameter of the shell when the plate is attached to an inside flange.
S = Minimum tensile stress of the plate in tons per square inch.

In no case shell the thickness of an unstayed flat-end plate be less than 3/8 inch.

Where an unstayed flat-end plate is pierced for electrodes or other fittings by openings having a diameter not greater than 2 ½ inches and the pitch of the openings in inches is not less than four times the diameter of the openings in inches, compensation is not required.

Where the diameter of the openings in an unstayed flat-end plate is greater than 2 ½ inches or the pitch in inches is less than four times the diameter of the openings, adequate compensation shall be provided in the manner described in Regulations 170, 171 and 186.

 
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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
Indian Boilers Act 1923 Ibr Forms Home Search Help Contact Us