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Reg. 135
SCREWED STAYS

 

Screwed Stays

a) Screwed stays and the holes for these shall be screwed with a continuous thread.
b) The screwed threads of the stay shall be clean free from checks or imperfections, of full depth, correct Whitworth form and a good fit in the holes. The middle portion shall preferably be turned down to the bottom of the thread.
c) The stays shall be screwed with fine threads of not less than 11 threads per inch.
d) The diameter of the stay over the threads shall not be less than ¾ inch or twice

the thickness of the firebox plate whichever is the greater.
e) The pitch of the stays at the furnace of vertical boilers shall not exceed 14 times the thickness of the furnace plate.
f) Where the stays are not fitted with nuts, the ends shall be riveted over to form substantial heads.

Alternatively stays may be screwed through the shell and firebox plates and the projecting ends shall be substantially fillet welded in an approved manner. The projection of the end of the stay from the surface of the plate shall be not less than one quarter of the diameter of the stay but in no case less than ¼ inch. The full end of the stay shall be visible on completion of the welding.
g) Crown stays of Loco type boilers shall either be fitted with nuts or riveted over on the fire side.
 
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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