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Reg. 195
FLAT PLATES


Flat tube plates

a) For the portions of the tube plates in the nests of tubes where stay tubes are required and where the minimum thickness and cross section of tube plate are not less than as prescribed in Regulation 211 the maximum working pressure shall be:-
W. P. = C ( t - 1 )2 Eqn.(33)
P2

where
P is the mean pitch of the stay tubes supporting any portion of the plate (being the sum of the four sides of the quadrilateral divided by four).

C = 70 for stay tubes screwed and expanded into the plate and no nuts fitted and for those attached by welding in accordance with regulations 147 (b).

C = 85 for stay tubes screwed and expanded into the plate and fitted with nuts.
b) No nuts shall be fitted to say tubes at the combustion chamber or fire box end.
c) Where the plates are exposed to the direct impact of flame the co-efficient C shall be reduced by 12-1/2 per cent, and where the thickness or cross section of tube plate between tube is less that as prescribed in Regulation 211 the appropriate co-efficient shall be reduced in proportion to the deficit.
d) For the wide water spaces of tube plates between the nests of tubes and between the wing rows of tubes and the shell, the maximum working pressure shall be:-
W. P. = C [ ( t - 1 )2 + .55t12 ] Eqn.(34)
A2 + B2

where
A = the horizontal pitch of stay tubes in inches measured across the wide water spaced from centre to centre,

B = the vertical pitch of stay tubes in the bounding rowes in inches measured from centre to centre,

C = 60 for stay tubes screwed and expanded into the tube plates and no nuts are fitted and for those attached by welding in accordance with regulations 147 (b).

C = 80 for stay tubes screwed and expanded into the tube plates and fitted with nuts.

C = 70 for stay tubes screwed and expanded into the tube plates and nuts are fitted only to alternate stay tube.

t is the thickness of the flat plat in 32nds of an inch.

t1 is the thickness of the washers, strips or doublings employed in 32nds of an inch.
e) Where the plates are exposed to the direct impact of flame, the co-efficient shall be reduced 12-1/2 per cent.
 
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