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Reg. 196
FLAT PLATES


Plates supported by gusset stays

a) For the end plates of Lancashire, Cornish, Vertical and Locotype boilers, and other flat surfaces supported by irregularly pitched gusset stays, the maximum working pressure shall : -
W. P. = C ( t - 1 )2 Eqn.(35)
D2

Where
D = the diameter in inches of the largest circle which can be drawn passing through not less than three points of support, viz. the centre lines of rivets or the commencement of the curvature of flanging, whichever is applicable.

C = 100 for plates not exposed to flame,

C = 88 for plates exposed to flame.
b) Where such plates are stiffened by suitable tee or angle bars securely riveted to the plates within the circle D, the appropriate co-efficient may be increased thirty per cent. Such stiffening bars shall be placed so as to transmit their load in a direct manner to the gusset stays or shell plate.
c) For the part of the end plate containing the manhole in Lancashire boiler the maximum working pressure shall be :-

 

W. P. = C [ ( t - 1 )2 + ( t1 - 1)2 ] Eqn.(36)
D2

Where D is the diameter in inches of the larges circle which can be drawn enclosing the manhole and passing through the centres of the rivets in the end plates connecting the shell and gusset angles and furnances or to the commencement of curvature of flanging, whichever is applicable where the circle passes through only  three of the possible five points of support mentioned the remaining two shall be embraced  within the circle;

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

t1 is the thickness of the base of the mouthpiece of flat ring in 32nds of an inch;

C = 90 where the manhole mouthpiece is either of mild or cast steel, and has a turned-in flange of a depth, measured inside of end plate, of not less than 4 times the thickness of the end plate and thickness not less than the thickness of the end plate; 

C = 70 where only a flat steel compensating ring is fitted;

C is to taken as the mean of the points of  support  through which circle passes in accordance with Regulation 193 where there is no mouthpiece or flat ring and the end plate is flanged around the manhole to the depth required in Regulation 201

 

 
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