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Reg. 209
TUBE PLATES


Compression of tube plates

a) For fire-box or combustion chamber tube plates which are subject to compression due to the pressure on the roof plate, the maximum working pressure shall be :-

 

W. P. =

C x ( P - D ) t

Eqn.(46)
L x P

where
t is the thickness of the tube plate in 32nds of an inch,

P is the pitch of the tubes in inches, measured, horizontally where the tubes are chain pitched, and diagonally where the tubes are zig- zag pitched, and diagonal pitch is less than the horizontal,

D is the internal diameter of the plain tubes in inches,

L is the internal length of the firebox or combustion chamber in inches measured at top between the tube plate and fire hole plate or back plate, or between tube plates in double ended boilers with combustion chambers common to two opposite furnaces,

C = 875 for steel and 437.5 for copper.

Provided that the above formula shall not apply in the case of fireboxes where the girders do not rest on the tube plate, or where the roof plate is stayed direct to the outer shell or to girders supported by the shell.

b) Where girders rest on the side plates or the roof plate is so formed that the load is carried both by side and end plates, in no case shall the compressive stress on the plates exceed 14,000 lbs. per square inch for steel or 7,000 lbs. per square inch for copper.
 
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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