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Reg. 123
FURNACES

 

Furnaces of Vertical Boilers

a) The furnaces of vertical boilers may be constructed in one or more lengthwise sections, each section being rolled from one plate to a full circle. In such cases, the component sections may be jointed circumferentially by electrically butt-welding or riveting. Where welded, they shall be stress relieved.
aa) In the case of vertical boilers where tube plates form part of the firebox, the tube plate portion may be constructed in two vertical sections and the vertical seams when welded shall be stress relieved.
b) Circular furnaces shall preferably be tapered, a taper of 1½ inches in diameter per 1 foot of height being recommended. The minimum water space at the bottom between the furnaces and the shell shall not be less than 2 inches for boilers upto 2 ft. 6 inches in diameter and shall be not less than 21/2 inches for boilers over 2 ft. 6 inches in diameter.
c) Where hemispherical furnace crowns are pressed from one plate they shall be pressed to form by machine in progressive stages without thinning and on completion shall be annealed.
d) Ogee flanging where integral with the firebox or in a separate ring shall preferably be formed at one heat by suitable machinery and shall be allowed to cool gradually to avoid internal stresses.
e) Furnaces of vertical type boilers may be attached to the shell at the firehole by a solid rectangular section steel ring riveted together or by a circular ring of substantial section fusion welded to shell and firebox. Where the latter construction is employed the opening in the shell for firehole shall be substantially compensated by a ring welded on the outside of the shell plate.
f) At the firehole the firebox plate and the shell plate may be flanged and fusion welded together.

 
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