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Reg. 213, Reg. 214
TUBE PLATES


Tubes plates, other than ends of vertical boilers forming parts of outer shell

a) When vertical boilers have nest or nests of horizontal tubes so that there is direct tension on the tube plates due to the vertical load on the boiler ends, or to their acting as horizontal ties across the shell the thickness of the tube plates and the spacing of the tubes shall be such that the section of metal taking the load is sufficient to keep the stress within that allowed on the shell plates.
b) Each alternate tube in the outer vertical rows of tubes shall be a stay tube. The tube plates between the stay tubes shall be of accordance with the rules for tube plates and in addition, considered as part shell, the maximum working pressure.

 

W.P. = 17.24 (t - 2) x (P - D) x S Eqn.(52)
R x P

Where
t is the thickness of the tube plate in 32nds of an inch,

P is the vertical pitch of the tubes in inches,

D is the diameter of the tube holes in inches,

S is the minimum tensile breaking strength of the tube plates in tons per square inch, or whatever is allowed for them,

R is the radial distance of the centre of the outer row of tube hole from the axis of the shell in inches.


Reg. 214
TUBE PLATES


Curved tube plates of water-tube boilers

For tube plates forming part of the cylindrical drums the maximum working pressure shall be : -

W.P. = 33.3(t - 4) x E x S Eqn.(53)
D

where
t = thickness of tube plate in 32nds of an inch,

E = Efficiency of the longitudinal joint or the ligament between the tube holes, whichever is less,

S = Minimum Tensile Stress of the tube plate in tons per sq. in or whatever is allowed for it,

D = Inside diameter of the drum in inches.
 
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