|Reg. 118, Reg. 119, Reg. 120
Smoke-box tube plates shall be flanged for attachment to
the barrel or shall be flat and connected thereto by an external
riveted angle ring.
Parts of flat tube plates within the tube nests
||where the total area of all
tube nests in directly fired multi-tubular boilers exceeds
7 sq. ft., stay tubes shall be fitted.
Where the total number of tubes in horizontal multitubular
waste heat boilers and direct fired loco type boilers
is arranged in one next, the area of which exceed 21 sq.
ft., stay tubes shall be fitted.
In all cases where the total number of tubes is arranged
in more than one nest, stay tubes shall be fitted.
||The parts of tube plates which
lie outside the nests of tubes shall be stayed or supported
wherever the size of the area of plate subject to steam
pressure necessitates staying or support, either by marginal
stay tubes or other means.
Flanging of End Plates
All flanges shall be a good fit to the shell and flues. Flogging
and/or hammering in the fitting of these parts is prohibited.
The caulking edges of all flanged plates shall be machined or
machine gas cut.