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Reg. 147
STAY TUBES

 

Screw Threads of Stay Tubes

a) Stay tubes shall be screwed at both ends with continuous threads, and the holes in the tube plates shall be tapped with continuous threads. The pitch of the threads shall not be finer than 11 threads per inch. The stay tubes shall be expanded by roller expanders and not made tight by caulking only.
b) Stay tubes may be attached by welding in which case they shall not be adjacent within the same tube next except in local areas, where not more than two adjacent stay tubes may be attached by welding. The form of attachment shall be such that there is a mechanical hold in addition to the welding, as shown in Figure 9A. On completion of welding the stay tubes shall be lightly re-expanded.
 
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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