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Reg. 547 c, Reg. 547 d

Loco-type fireboxes

 
Loco-type firebox wrapper plate sides shall preferably be tapered. The water space at the bottom between the firebox and the shell shall be not less than 2 ½ inches.

Where the firebox tube plate or firehole plate is flanged for connection to the wrapper plate, the weld shall be located between the commencement of curvature of the flange and first row of screwed stays.

Rings for firehole mouthpieces or foundation rings shall be made of mild steel.

Z Sections shall not be used for foundation rings. The attachment of the firebox to the outer casing shall be in accordance with Figures XII/29, XII/30 or  XII/31.

The method of attachment of firehole mouthpieces shall be in accordance with Figure XII/32 or, where the outer casing and the firebox plate are flanged towards the water side to form the firehole, a ring of screwed stays located at not more than half the average pitch of the stays distant from the commencement of the curvature of the flanging shall be provided (see Figure XII/37).



(d) Water-cooled combustion chambers

The attachment of the combustion chambers tube plates and back plates to the wrapper plate shall be in accordance with Figure XII/17, XII/18, XII/19, XII/20 and where the tube plate or back plate is flanged for connection to the wrapper plate the weld shall be located between the commencement of curvature of the flange and the first row of screwed stays.

The method of attachment of furnace or flue tubes shall be in accordance with figures XII/14, XII/15 or XII/16 and access openings shall be in accordance with Figure XII/32 or XII/38.
 
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