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Reg. 136, Reg. 137, Reg. 138
SCREWED STAYS

 

Axial drilling

All screwed stays less than 14 inches long should preferably be drilled with a tell-tale hole 3/16 inch diameter to a depth of ½ inch beyond the inner face of the plate. Stays which are obscure on one side should preferably be made from hollow staybar.


Reg. 137
SCREWED STAYS

 

Stay Nuts

a) Nuts to screw stays in combustion chambers and fireboxes shall not be less than ¾ inch thick for stays upto 1½ inches diameter over threads, 7/8 inch thick for 1 5/8 inches and 1¾ inches stays, 1 inch thick for 1thick 1 7/8 and 2 inches stays, and 1 1/8 inches thick for stays over 2 inches in diameter.
b) The nuts shall be made of solid mild steel or of iron which shall be without weld if exposed to flame.


Reg. 138
SCREWED STAYS

 

Spacing of End Stays – Allowance for curves, etc.

For the topes of fireboxes and combustion chambers the distance between the rows of stays nearest to the tube plate or firehole plate or back plate as the case may be, and the commencement of curvature of these plates at their flanges shall not be greater than the horizontal pitch of the stays.
 
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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